® Intel Desktop Board D845BG/D845PT Technical Product Specification November 2001 Order Number: A75852-001 ® The Intel Desktop Boards D845BG/D845PT may contain design defects or errors known as errata that may cause the product to deviate from published specifications. Current characterized errata are documented in the Intel Desktop Board D845BG/D845PT Specification Update. Revision History Revision Revision History Date ® -001 First release of the Intel Desktop Board D845BG/D845PT Technical November 2001 Product Specification. This product specification applies to only standard D845BG and D845PT boards with BIOS identifier PT84510A.86A. Changes to this specification will be published in the Intel Desktop Board D845BG/D845PT Specification Update before being incorporated into a revision of this document. ® INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. EXCEPT AS PROVIDED IN INTEL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel Corporation may have patents or pending patent applications, trademarks, copyrights, or other intellectual property rights that relate to the presented subject matter. The furnishing of documents and other materials and information does not provide any license, express or implied, by estoppel or otherwise, to any such patents, trademarks, copyrights, or other intellectual property rights. Intel products are not intended for use in medical, life saving, or life sustaining applications or for any other application in which the failure of the Intel product could create a situation where personal injury or death may occur. Intel may make changes to specifications, product descriptions, and plans at any time, without notice. ® The Intel Desktop Boards D845BG and D845PT may contain design defects or errors known as errata that may cause the product to deviate from published specifications. Current characterized errata are available on request. Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order. Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be obtained from: Intel Corporation P.O. Box 5937 Denver, CO 80217-9808 or call in North America 1-800-548-4725, Europe 44-0-1793-431-155, France 44-0-1793-421-777, Germany 44-0-1793-421-333, other Countries 708-296-9333. Intel and Pentium are registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. † Other names and brands may be claimed as the property of others. Copyright  2001, Intel Corporation. All rights reserved. Preface This Technical Product Specification (TPS) specifies the board layout, components, connectors, ® power and environmental requirements, and the BIOS for these Intel Desktop Boards: D845BG and D845PT. It describes the standard product and available manufacturing options. Intended Audience The TPS is intended to provide detailed, technical information about the D845BG and D845PT boards and their components to the vendors, system integrators, and other engineers and technicians who need this level of information. It is specifically not intended for general audiences. What This Document Contains Chapter Description 1 A description of the hardware used on the D845BG and D845PT boards 2 A map of the resources of the boards 3 The features supported by the BIOS Setup program 4 The contents of the BIOS Setup program’s menus and submenus 5 A description of the BIOS error messages, beep codes, and POST codes Typographical Conventions This section contains information about the conventions used in this specification. Not all of these symbols and abbreviations appear in all specifications of this type. Notes, Cautions, and Warnings NOTE ✏ Notes call attention to important information. CAUTION Cautions are included to help you avoid damaging hardware or losing data. WARNING Warnings indicate conditions, which if not observed, can cause personal injury. iii Intel Desktop Board D845BG/D845PT Technical Product Specification Other Common Notation # Used after a signal name to identify an active-low signal (such as USBP0#) (NxnX) When used in the description of a component, N indicates component type, xn are the relative coordinates of its location on the D845BG and D845PT boards, and X is the instance of the particular part at that general location. For example, J5J1 is a connector, located at 5J. It is the first connector in the 5J area. GB Gigabyte (1,073,741,824 bytes) GB/sec Gigabytes per second KB Kilobyte (1024 bytes) Kbit Kilobit (1024 bits) kbits/sec 1000 bits per second MB Megabyte (1,048,576 bytes) MB/sec Megabytes per second Mbit Megabit (1,048,576 bits) Mbit/sec Megabits per second xxh An address or data value ending with a lowercase h indicates a hexadecimal value. x.x V Volts. Voltages are DC unless otherwise specified. † This symbol is used to indicate third-party brands and names that are the property of their respective owners. iv Contents 1 Product Description 1.1 Board Differences.......................................................................................................11 1.2 Overview ....................................................................................................................12 1.2.1 Feature Summary ........................................................................................12 1.2.2 Manufacturing Options .................................................................................13 1.2.3 Board Layouts..............................................................................................14 1.2.4 Block Diagram..............................................................................................16 1.3 Online Support ...........................................................................................................18 1.4 Operating System Support .........................................................................................18 1.5 Design Specifications .................................................................................................19 1.6 Processor ...................................................................................................................22 1.7 System Memory .........................................................................................................23 ® 1.8 Intel 845 Chipset.......................................................................................................25 1.8.1 AGP .............................................................................................................26 1.8.2 USB..............................................................................................................27 1.8.3 IDE Support .................................................................................................29 1.8.4 Real-Time Clock, CMOS SRAM, and Battery...............................................30 ® 1.8.5 Intel 82802AB 4 Mbit Firmware Hub (FWH) ...............................................30 1.9 I/O Controller..............................................................................................................30 1.9.1 Serial Ports ..................................................................................................31 1.9.2 Parallel Port..................................................................................................31 1.9.3 Diskette Drive Controller ..............................................................................32 1.9.4 Keyboard and Mouse Interface ....................................................................32 1.10 Audio Subsystem........................................................................................................33 1.10.1 Audio Connectors.........................................................................................34 1.10.2 Audio Subsystem Software ..........................................................................34 1.11 LAN Subsystem (Optional) .........................................................................................35 ® 1.11.1 Intel 82562ET Platform LAN Connect Device.............................................35 1.11.2 RJ-45 LAN Connector with Integrated LEDs ................................................35 1.11.3 LAN Subsystem Software ............................................................................36 1.12 CNR (Optional)...........................................................................................................36 1.13 Hardware Management Subsystem............................................................................37 1.13.1 Hardware Monitor Component .....................................................................37 1.13.2 Fan Monitoring .............................................................................................37 1.13.3 Chassis Intrusion and Detection...................................................................38 1.14 Power Management ...................................................................................................38 1.14.1 ACPI.............................................................................................................38 1.14.2 Hardware Support ........................................................................................42 v Intel Desktop Board D845BG/D845PT Technical Product Specification 2 Technical Reference 2.1 Introduction.................................................................................................................47 2.2 Memory Map ..............................................................................................................47 2.3 I/O Map .....................................................................................................................48 2.4 DMA Channels ...........................................................................................................50 2.5 PCI Configuration Space Map ....................................................................................50 2.6 Interrupts ....................................................................................................................51 2.7 PCI Interrupt Routing Map..........................................................................................52 2.8 Connectors.................................................................................................................54 2.8.1 Back Panel Connectors................................................................................55 2.8.2 Internal I/O Connectors ................................................................................58 2.8.3 External I/O Connectors...............................................................................71 2.9 Jumper Blocks............................................................................................................75 2.9.1 Front Panel Audio Connector/Jumper Block.................................................75 2.9.2 BIOS Setup Configuration Jumper Block......................................................76 2.10 Mechanical Considerations.........................................................................................77 2.10.1 D845BG Form Factor...................................................................................77 2.10.2 D845PT Form Factor....................................................................................78 2.10.3 I/O Shield .....................................................................................................79 2.11 Electrical Considerations ............................................................................................82 2.11.1 Power Consumption.....................................................................................82 2.11.2 Add-in Board Considerations........................................................................82 2.11.3 Standby Current Requirements....................................................................83 2.11.4 Fan Connector Current Capability ................................................................84 2.11.5 Power Supply Considerations ......................................................................84 2.12 Thermal Considerations..............................................................................................85 2.13 Reliability ....................................................................................................................87 2.14 Environmental ............................................................................................................87 2.15 Regulatory Compliance ..............................................................................................88 2.15.1 Safety Regulations .......................................................................................88 2.15.2 EMC Regulations .........................................................................................88 2.15.3 Product Certification Markings (Board Level) ...............................................89 3 Overview of BIOS Features 3.1 Introduction.................................................................................................................91 3.2 BIOS Flash Memory Organization ..............................................................................92 3.3 Resource Configuration..............................................................................................92 3.3.1 PCI Autoconfiguration ..................................................................................92 3.3.2 PCI IDE Support...........................................................................................92 3.4 System Management BIOS (SMBIOS).......................................................................93 3.5 Legacy USB Support ..................................................................................................93 3.6 BIOS Updates ............................................................................................................94 3.6.1 Language Support........................................................................................95 3.6.2 Custom Splash Screen.................................................................................95 3.7 Recovering BIOS Data ...............................................................................................95 vi Contents 3.8 Boot Options...............................................................................................................96 3.8.1 CD-ROM and Network Boot .........................................................................96 3.8.2 Booting Without Attached Devices ...............................................................96 ® 3.9 Fast Booting Systems with Intel Rapid BIOS Boot....................................................96 3.9.1 Peripheral Selection and Configuration ........................................................96 3.9.2 Intel Rapid BIOS Boot ..................................................................................97 3.10 BIOS Security Features..............................................................................................98 4 BIOS Setup Program 4.1 Introduction.................................................................................................................99 4.2 Maintenance Menu...................................................................................................100 4.2.1 Extended Configuration Submenu..............................................................101 4.3 Main Menu................................................................................................................102 4.4 Advanced Menu........................................................................................................103 4.4.1 PCI Configuration Submenu.......................................................................104 4.4.2 Boot Configuration Submenu .....................................................................105 4.4.3 Peripheral Configuration Submenu.............................................................106 4.4.4 IDE Configuration Submenu.......................................................................108 4.4.5 Diskette Configuration Submenu................................................................111 4.4.6 Event Log Configuration Submenu.............................................................112 4.4.7 Video Configuration Submenu....................................................................113 4.5 Security Menu ..........................................................................................................114 4.6 Power Menu .............................................................................................................115 4.6.1 ACPI Submenu ..........................................................................................116 4.7 Boot Menu................................................................................................................117 4.7.1 Boot Device Priority Submenu....................................................................118 4.7.2 Hard Disk Drives Submenu ........................................................................119 4.7.3 Removable Devices Submenu ...................................................................119 4.7.4 ATAPI CD-ROM Drives Submenu..............................................................120 4.8 Exit Menu .................................................................................................................120 5 Error Messages and Beep Codes 5.1 BIOS Error Messages...............................................................................................121 5.2 Port 80h POST Codes..............................................................................................123 5.3 Bus Initialization Checkpoints ...................................................................................127 5.4 Speaker ...................................................................................................................128 5.5 BIOS Beep Codes ....................................................................................................128 Figures 1. D845BG Board Components ......................................................................................14 2. D845PT Board Components.......................................................................................15 3. Block Diagram............................................................................................................16 4. Block Diagram with Optional USB 2.0 Support ...........................................................17 5. Intel 845 Chipset Block Diagram.................................................................................25 6. USB 1.1 Port Configuration ........................................................................................27 7. USB 2.0 Port Configuration (Optional)........................................................................28 8. Audio Subsystem Block Diagram................................................................................33 9. ICH2 and CNR Signal Interface..................................................................................36 vii Intel Desktop Board D845BG/D845PT Technical Product Specification 10. Location of the Standby Power Indicator LED ............................................................44 11. Back Panel Connectors ..............................................................................................55 12. Audio Connectors.......................................................................................................59 13. Power and Hardware Control Connectors ..................................................................61 14. D845BG Add-in Board and Peripheral Interface Connectors ......................................64 15. D845PT Add-in Board and Peripheral Interface Connectors.......................................65 16. External I/O Connectors .............................................................................................71 17. Location of the Jumper Blocks....................................................................................75 18. D845BG Board Dimensions........................................................................................77 19. D845PT Board Dimensions ........................................................................................78 20. I/O Shield Dimensions (for boards with the LAN Subsystem, but not USB 2.0) ..........79 21. I/O Shield Dimensions (for boards with neither the LAN Subsystem nor USB 2.0) .....80 22. I/O Shield Dimensions (for boards without the LAN Subsystem, but with USB 2.0)....81 23. Localized High Temperature Zones............................................................................86 Tables 1. Summary of Board Differences...................................................................................11 2. Feature Summary.......................................................................................................12 3. Manufacturing Options ...............................................................................................13 4. Specifications .............................................................................................................19 5. Supported Processors ................................................................................................22 6. Supported Memory Configurations .............................................................................24 7. LAN Connector LED States........................................................................................35 8. Effects of Pressing the Power Switch .........................................................................39 9. Power States and Targeted System Power ................................................................40 10. Wake-up Devices and Events.....................................................................................41 11. Fan Connector Function/Operation.............................................................................43 12. System Memory Map..................................................................................................47 13. I/O Map ......................................................................................................................48 14. DMA Channels ...........................................................................................................50 15. PCI Configuration Space Map ....................................................................................50 16. Interrupts ....................................................................................................................51 17. PCI Interrupt Routing Map..........................................................................................53 18. PS/2 Mouse/Keyboard Connector ..............................................................................56 19. USB Connectors.........................................................................................................56 20. Parallel Port Connector...............................................................................................56 21. Serial Port A Connector..............................................................................................57 22. LAN Connector (Optional) ..........................................................................................57 23. Audio Line In Connector .............................................................................................57 24. Audio Line Out Connector ..........................................................................................57 25. Mic In Connector ........................................................................................................57 26. Auxiliary Line In Connector.........................................................................................60 27. ATAPI CD-ROM Connector ........................................................................................60 28. ATX12V Power Connector..........................................................................................62 29. Rear Chassis Fan Connector .....................................................................................62 30. Processor Fan Connector...........................................................................................62 31. Main Power Connector ...............................................................................................63 viii Contents 32. Front Chassis Fan Connector.....................................................................................63 33. Chassis Intrusion Connector.......................................................................................63 34. CNR Connector (Optional)..........................................................................................66 35. PCI Bus Connectors...................................................................................................67 36. AGP Connector ..........................................................................................................68 37. Diskette Drive Connector............................................................................................69 38. PCI IDE Connectors ...................................................................................................70 39. SCSI LED Connector..................................................................................................70 40. Front Panel Audio Connector .....................................................................................72 41. Serial Port B Connector..............................................................................................72 42. Front Panel USB Connector .......................................................................................72 43. Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector ........................72 44. Front Panel Connector ...............................................................................................73 45. States for a One-Color Power LED.............................................................................73 46. States for a Two-Color Power LED.............................................................................74 47. Front Panel Audio Connector/Jumper Block ...............................................................76 48. BIOS Setup Configuration Jumper Settings................................................................76 49. Power Usage..............................................................................................................82 50. Standby Current Requirements ..................................................................................83 51. Fan Connector Current Capability ..............................................................................84 52. Thermal Considerations for Components ...................................................................86 53. D845BG/D845PT Board Environmental Specifications...............................................87 54. Safety Regulations .....................................................................................................88 55. EMC Regulations........................................................................................................88 56. Supervisor and User Password Functions..................................................................98 57. BIOS Setup Program Menu Bar .................................................................................99 58. BIOS Setup Program Function Keys ........................................................................100 59. Maintenance Menu...................................................................................................100 60. Extended Configuration Submenu............................................................................101 61. Main Menu................................................................................................................102 62. Advanced Menu........................................................................................................103 63. PCI Configuration Submenu .....................................................................................104 64. Boot Configuration Submenu....................................................................................105 65. Peripheral Configuration Submenu...........................................................................106 66. IDE Configuration Submenu .....................................................................................108 67. Primary/Secondary IDE Master/Slave Submenus.....................................................109 68. Diskette Configuration Submenu ..............................................................................111 69. Event Log Configuration Submenu...........................................................................112 70. Video Configuration Submenu..................................................................................113 71. Security Menu ..........................................................................................................114 72. Power Menu .............................................................................................................115 73. ACPI Submenu.........................................................................................................116 74. Boot Menu................................................................................................................117 75. Boot Device Priority Submenu..................................................................................118 76. Hard Disk Drives Submenu ......................................................................................119 77. Removable Devices Submenu..................................................................................119 78. ATAPI CD-ROM Drives Submenu ............................................................................120 79. Exit Menu .................................................................................................................120 ix Intel Desktop Board D845BG/D845PT Technical Product Specification 80. BIOS Error Messages...............................................................................................121 81. Uncompressed INIT Code Checkpoints....................................................................123 82. Boot Block Recovery Code Checkpoints ..................................................................123 83. Runtime Code Uncompressed in F000 Shadow RAM ..............................................124 84. Bus Initialization Checkpoints ...................................................................................127 85. Upper Nibble High Byte Functions............................................................................127 86. Lower Nibble High Byte Functions............................................................................128 87. Beep Codes..............................................................................................................129 x 1 Product Description What This Chapter Contains 1.1 Board Differences.......................................................................................................11 1.2 Overview ....................................................................................................................12 1.3 Online Support ...........................................................................................................18 1.4 Operating System Support .........................................................................................18 1.5 Design Specifications .................................................................................................19 1.6 Processor ...................................................................................................................22 1.7 System Memory .........................................................................................................23 ® 1.8 Intel 845 Chipset.......................................................................................................25 1.9 I/O Controller..............................................................................................................30 1.10 Audio Subsystem........................................................................................................33 1.11 LAN Subsystem (Optional) .........................................................................................35 1.12 CNR (Optional)...........................................................................................................36 1.13 Hardware Management Subsystem............................................................................37 1.14 Power Management ...................................................................................................38 1.1 Board Differences ® This TPS describes these Intel Desktop boards: D845BG and D845PT. The boards are identical with the exception of the items listed in Table 1. Table 1. Summary of Board Differences D845BG • ATX Form Factor (12.00 inches by 8.20 inches) (Note) • Six PCI bus connectors • Optional Universal Serial Bus (USB) 2.0 D845PT • microATX Form Factor (9.60 inches by 8.20 inches) • Three PCI bus connectors Note: All D845BG boards with the NEC µPD720100 USB 2.0 host controller have only five PCI bus connectors. NOTE ✏ Most of the illustrations in this document show only the D845PT board. When there are significant differences between the two boards, illustrations of both boards are provided. 11 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.2 Overview 1.2.1 Feature Summary Table 2 summarizes the D845BG and D845PT boards’ major features. Table 2. Feature Summary Form Factor D845BG: ATX (12.00 inches by 8.20 inches) D845PT: microATX (9.60 inches by 8.20 inches) ® ® Processor • Support for an Intel Pentium 4 processor in a µPGA478 socket • 400 MHz system bus Memory • Two 184-pin DDR SDRAM Dual Inline Memory Module (DIMM) sockets • Support for single-sided or double-sided DIMMs (DDR 200 and DDR 266) • Support for up to 2 GB system memory NOTE: The D845BG/D845PT boards have been designed to support DIMMs based on 512 Mbit technology for a maximum onboard capacity of up to 2 GB, but this technology has not been validated on this board. Please refer to the following Intel web sites. For the D845BG board: http://developer.intel.com/design/motherbd/bg/bg_mem.htm For the D845PT board: http://developer.intel.com/design/motherbd/pt/pt_mem.htm ® Chipset Intel 845 Chipset, consisting of: ® • Intel 82845 Memory Controller Hub (MCH) ® • Intel 82801BA I/O Controller Hub (ICH2) ® • Intel 82802AB 4 Mbit Firmware Hub (FWH) Audio Audio subsystem for AC ‘97 processing using the Analog Devices AD1885 codec Video AGP connector supporting 1.5 V 4X AGP cards I/O Control SMSC LPC47M142 LPC Bus I/O controller Peripheral • Up to seven USB ports Interfaces • Two serial ports • One parallel port • Two IDE interfaces with UDMA 33, ATA-66/100 support • One diskette drive interface † • PS/2 keyboard and mouse ports • Three fan connectors Expansion • D845BG: Six PCI bus add-in card connectors (SMBus routed to PCI bus Capabilities connector 1) • D845PT: Three PCI bus add-in card connectors (SMBus routed to PCI bus connector 1) Hardware Monitor • Voltage sense to detect out of range power supply voltages Subsystem • Thermal sense to detect out of range thermal values • Two fan sense inputs used to monitor fan activity continued 12 Product Description Table 2. Feature Summary (continued) BIOS • Intel/AMI BIOS (resident in the Intel 82802AB 4 Mbit FWH) • Support for Advanced Configuration and Power Interface (ACPI), Plug and Play, and SMBIOS Instantly Available • Support for PCI Local Bus Specification Revision 2.2 PC Technology • Suspend to RAM support • Wake on PCI, CNR, RS-232, front panel, PS/2 devices, and USB ports For information about Refer to The board’s compliance level with ACPI, Plug and Play, and SMBIOS. Section 1.5, page 19 1.2.2 Manufacturing Options Table 3 describes the D845BG and D845PT boards’ manufacturing options. Not every manufacturing option is available in all marketing channels. Please contact your Intel representative to determine which manufacturing options are available to you. Table 3. Manufacturing Options CNR One Communication and Networking Riser (CNR) connector (slot shared with PCI bus connector 6 on the D845BG board and with PCI bus connector 3 on the D845PT board) ® LAN Intel 82562ET 10/100 Mbit/sec Platform LAN Connect (PLC) device USB 2.0 Support for USB 2.0 devices. The USB 2.0 option uses the NEC µPD720100 USB 2.0 host controller and supports up to five USB ports. This option is currently available only on the D845BG board. For information about Refer to Available configurations for the D845BG and D845PT boards Section 1.3, page 18 NOTE ✏ The LAN and the CNR manufacturing options are mutually exclusive. 13 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.2.3 Board Layouts Figure 1 shows the location of the major components on the D845BG board. A B C D E T F S G R Q H P I O N M L K J OM12997 A Audio codec K IDE connectors B Intel 82562ET PLC device (optional) L Diskette drive connector C AGP connector M Intel 82802AB 4 Mbit Firmware Hub (FWH) D Back panel connectors N Speaker E +12 V power connector (ATX12V) O Front panel connector F Intel 82845 Memory Controller Hub (MCH) P Intel 82801BA I/O Controller Hub (ICH2) G µPGA478 processor socket Q NEC µPD720100 USB 2.0 host controller (optional) H DIMM sockets R Battery I I/O controller S PCI bus add-in card connectors J Power connector T CNR connector (optional) Figure 1. D845BG Board Components 14 Product Description Figure 2 shows the location of the major components on the D845PT board. A B C D E S F R G Q H P O I N M L K J OM12986 A Audio codec K IDE connectors B Intel 82562ET PLC device (optional) L Diskette drive connector C AGP connector M Intel 82802AB 4 Mbit Firmware Hub (FWH) D Back panel connectors N Speaker E +12 V power connector (ATX12V) O Front panel connector F Intel 82845 Memory Controller Hub (MCH) P Intel 82801BA I/O Controller Hub (ICH2) G µPGA478 processor socket Q Battery H DIMM sockets R PCI bus add-in card connectors I I/O controller S CNR connector (optional) J Power connector Figure 2. D845PT Board Components 15 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.2.4 Block Diagram Figure 3 is a block diagram of the major functional areas of the standard D845BG and D845PT boards. See Figure 6 on page 27 for USB port routing. Back Panel USB USB Ports (2) = connector or socket Front Panel USB Ports (2) Serial Ports LPC I/O Parallel Port Primary/ UDMA 33 and Controller Secondary IDE ATA-66/100 PS/2 Mouse PS/2 Keyboard Diskette Drive µPGA478 System Bus Connector Processor Socket (400 MHz) USB LPC Bus 845 Chipset 82801BA 82802AB 4 Mbit 82845 Memory AHA AGP Controller Hub I/O Controller Hub Firmware Hub Interface Bus (ICH2) (FWH) (MCH) 4X AGP Connector (1.5 V only) Physical LAN Layer Connector DDR SDRAM Interface (optional) (optional) Bus DIMM Banks (2) CSMA/CD Unit Interface CNR Hardware USB Connector Monitor (optional) AC Link SMBus Line In Line Out Mic In PCI Slot 1 PCI Bus AD1885 Audio Codec PCI Slot 2 Auxiliary Line In CD-ROM PCI Slot 3 PCI Slot 4 D845BG PCI Slot 5 Only Back Panel USB USB Ports (2) PCI Slot 6 OM13008 Figure 3. Block Diagram 16 Product Description Figure 4 is a block diagram of the major functional areas of the D845BG board with the USB 2.0 manufacturing option. See Figure 7 on page 28 for USB port routing. = connector or socket Serial Ports LPC I/O Parallel Port Primary/ UDMA 33 and Controller PS/2 Mouse Secondary IDE ATA-66/100 PS/2 Keyboard Diskette Drive µPGA478 System Bus Connector Processor Socket (400 MHz) LPC Bus 845 Chipset 82801BA 82802AB 4 Mbit 82845 Memory AHA AGP Controller Hub I/O Controller Hub Firmware Hub Interface Bus (ICH2) (FWH) (MCH) 4X AGP Connector (1.5 V only) CSMA/CD Unit Interface CNR DDR SDRAM Connector AC Link Bus DIMM Banks (2) Line In Line Out Hardware AD1885 Mic In Monitor Audio Codec Auxiliary Line In CD-ROM SMBus NEC µPD720100 Back Panel PCI Slot 1 PCI Bus USB 2.0 USB USB Ports (2) Host Controller PCI Slot 2 Front Panel USB Ports (2) PCI Slot 3 USB PCI Slot 4 PCI Slot 5 OM13009 Figure 4. Block Diagram with Optional USB 2.0 Support 17 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.3 Online Support To find information about… Visit this World Wide Web site: Intel’s D845BG and D845PT boards http://www.intel.com/design/motherbd under “Product Info” or “Customer Support” http://support.intel.com/support/motherboards/desktop Available configurations for the D845BG http://developer.intel.com/design/motherbd/bg/bg_available.htm board Available configurations for the D845PT http://developer.intel.com/design/motherbd/pt/pt_available.htm board Processor data sheets http://www.intel.com/design/litcentr ICH2 addressing http://developer.intel.com/design/chipsets/datashts Custom splash screens http://intel.com/design/motherbd/gen_indx.htm Audio software and utilities http://www.intel.com/design/motherbd LAN software and drivers http://www.intel.com/design/motherbd 1.4 Operating System Support The D845BG and D845PT boards support drivers for all of the onboard hardware and subsystems under the following operating systems: † • Microsoft Windows 98 SE • Windows ME † • Windows NT 4.0 • Windows 2000 • Windows XP For information about Refer to Supported drivers Section 1.3 NOTE ✏ Third party vendors may offer other drivers. ✏ NOTE The USB 2.0 option requires an operating system that officially supports USB 2.0. USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system. 18 Product Description 1.5 Design Specifications Table 4 lists the specifications applicable to the D845BG and D845PT boards. Table 4. Specifications Reference Specification Version, Revision Date, The information is Name Title and Ownership available from… AC ’97 Audio Codec ’97 Revision 2.2, ftp://download.intel.com/ial/ September 2000, scalableplatforms/ac97r22.pdf Intel Corporation. ACPI Advanced Configuration Version 2.0, http://www.acpi.info/spec.htm and Power Interface July 27, 2000, Specification Compaq Computer Corporation, Intel Corporation, Microsoft Corporation, Phoenix Technologies Limited, and Toshiba Corporation. AGP Accelerated Graphics Port Revision 2.0, http://www.agpforum.org/ Interface Specification May 4, 1998, specs_specs.htm Intel Corporation. AMI BIOS AMIBIOS Desktop Core 7.0 AMIBIOS 7.0, http://www.ami.com/support/ August 8, 2001, doc/amibiosdesktop.pdf American Megatrends, Inc. ATA/ Information Technology-AT Revision 3, http://www.t13.org ATAPI-5 Attachment with Packet February 29, 2000, Interface - 5 Contact: T13 Chair, (ATA/ATAPI-5) Seagate Technology. ATX ATX Specification Version 2.03, http://www.formfactors.org/ December 1998, developer/specs/atx/ Intel Corporation. atxspecs.htm ATX12V ATX/ATX12V Power Version 1.1, http://www.formfactors.org/ Supply Design Guide August 2000, developer/specs/atx/ Intel Corporation. atxspecs.htm BIS Boot Integrity Services Version 1.0 for WfM 2.0 http://developer.intel.com/ August 1999, design/security/bis/ Intel Corporation. bisfaq.htm CNR Communication and Revision 1.1, http://developer.intel.com/ Network Riser (CNR) October 18, 2000, technology/cnr/index.htm Specification Intel Corporation. continued 19 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 4. Specifications (continued) Reference Specification Version, Revision Date and The information is Name Title Ownership available from… DDR Double Data Rate (DDR) Version 1.0, http://www.jedec.org/ SDRAM SDRAM Specification June 2000, JEDEC Solid State Technology Association. Design Specification for Revision 1.0, http://www.jedec.org/ a 184 Pin DDR June 2000, Unbuffered DIMM JEDEC Solid State Technology Association. ® Intel JEDEC DDR Revision 0.9, http://developer.intel.com/ 200/266 Unbuffered September 27, 2001, technology/memory/ DIMM Specification Intel Corporation. index.htm Addendum EHCI Enhanced Host Revision 0.96, http://developer.intel.com/ Controller Interface June 20, 2001, technology/usb/ Specification for Intel Corporation. ehcispec.htm Universal Serial Bus EPP IEEE Std 1284.1-1997 Version 1.7, http://standards.ieee.org/ (Enhanced Parallel Port) 1997, reading/ieee/std_public/ Institute of Electrical and description/busarch/ Electronic Engineers. 1284.1-1997_desc.html El Torito Bootable CD-ROM Version 1.0, http://www.phoenix.com/ Format Specification January 25, 1995, PlatSS/products/specs.html Phoenix Technologies Limited and International Business Machines Corporation. Front Panel Front Panel I/O Version 1.0, http://www.formfactors.org/ Connectivity Design October 2000, formfactors/ Guide Intel Corporation. front_panel_io.htm LPC Low Pin Count Interface Revision 1.0, http://www.intel.com/ Specification September 29, 1997, design/chipsets/industry/ Intel Corporation. lpc.htm MicroATX microATX Motherboard Version 1.0, http://www.formfactors.org/ Interface Specification December 1997, developer/specs/microatx/ Intel Corporation. microatxspecs.htm OHCI OpenHCI – Open Host Release 1.0a, http://www.usb.org/ Controller Interface October 10, 1996, developers/docs.html Specification for USB Compaq Computer Corp., Microsoft Corporation, and National Semiconductor Corp. PCI PCI Local Bus Revision 2.2, http://www.pcisig.com/ Specification December 18, 1998, specifications PCI Special Interest Group. PCI Bus Power Revision 1.1, http://www.pcisig.com/ Management Interface December 18, 1998, specifications Specification PCI Special Interest Group. continued 20 Product Description Table 4. Specifications (continued) Reference Specification Version, Revision Date The information is Name Title and Ownership available from… Plug and Plug and Play BIOS Version 1.0a, http://www.microsoft.com/ Play Specification May 5, 1994, hwdev/respec/ Compaq Computer Corporation, pnpspecs.htm Phoenix Technologies Limited, and Intel Corporation. PXE Preboot Execution Version 2.1, ftp://download.intel.com/ial/ Environment September 20, 1999, wfm/pxespec.pdf Intel Corporation. SFX SFX/SFX12V Power Version 2.0, http://www.formfactors.org/ Supply Design Guide May 2001, developer/specs/sfx/ Intel Corporation. sfx12v.pdf SMBIOS System Management Version 2.3.1, http://www.dmtf.org/ BIOS March 16, 1999, download/standards/ American Megatrends DSP0119.pdf Incorporated, Award Software International Incorporated, Compaq Computer Corporation, Dell Computer Corporation, Hewlett-Packard Company, Intel Corporation, International Business Machines Corporation, Phoenix Technologies Limited, and SystemSoft Corporation. UHCI Universal Host Controller Revision 1.1, http://www.usb.org/ Interface Design Guide March 1996, developers/docs.html Intel Corporation. USB Universal Serial Bus Revision 1.1, http://www.usb.org/ Specification September 23, 1998, developers/docs.html Compaq Computer Corporation, Intel Corporation, Microsoft Corporation, and NEC Corporation. Revision 2.0, http://www.usb.org/ April 27, 2000, developers/docs.html Compaq Computer Corporation, Hewlett-Packard Company, Lucent Technologies Inc., Intel Corporation, Microsoft Corporation, NEC Corporation, and Koninklijke Philips Electronics N.V. WfM Wired for Management Version 2.0, http://developer.intel.com/ Baseline December 18, 1998, ial/WfM/wfmspecs.htm Intel Corporation. 21 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.6 Processor CAUTION Use only the processors listed below. Use of unsupported processors can damage the board, the ® processor, and the power supply. See the Intel Desktop Board D845BG/D845PT Specification Update for the most up-to-date list of supported processors for these boards. The D845BG and D845PT boards support a single Pentium 4 processor (in a µPGA478 socket) with a system bus of 400 MHz. The D845BG and D845PT boards support the processors listed in Table 5. All supported onboard memory can be cached, up to the cachability limit of the processor. See the processor’s data sheet for cachability limits. Table 5. Supported Processors Type Designation System Bus L2 Cache Size Pentium 4 processor 1.5, 1.6, 1.7, 1.8, 1.9, 400 MHz 256 KB and 2.0 GHz NOTE ✏ Use only ATX12V- or SFX12V-compliant power supplies with the D845BG and D845PT boards. ATX12V and SFX12V power supplies have an additional power lead that provides required supplemental power for the Intel Pentium 4 processor. Always connect the 20-pin and 4-pin leads of ATX12V and SFX12V power supplies to the corresponding connectors on the D845BG and D845PT boards, otherwise the board will not boot. Do not use a standard ATX power supply. The board will not boot with a standard ATX power supply. For information about Refer to Processor support Section 1.3, page 18 Processor usage Section 1.3, page 18 Power supply connectors Section 2.8.2.3, page 61 22 Product Description 1.7 System Memory NOTE ✏ Remove the AGP video card before installing or upgrading memory to avoid interference with the memory retention mechanism. NOTE ✏ The D845BG/D845PT boards have been designed to support DIMMs based on 512 Mbit technology for a maximum onboard capacity of up to 2 GB, but this technology has not been validated on this board. Please refer to the following Intel web sites for the latest lists of tested memory. For the D845BG board: http://developer.intel.com/design/motherbd/bg/bg_mem.htm For the D845PT board: http://developer.intel.com/design/motherbd/pt/pt_mem.htm The D845BG and D845PT boards both have two DIMM sockets and support the following memory features: • 2.5 V (only) 184-pin DDR SDRAM DIMMs with gold-plated contacts • Unbuffered single-sided or double-sided DIMMs • Maximum total system memory: 2 GB; minimum total system memory: 64 MB • 200/266 MHz DDR SDRAM DIMMs only • Serial Presence Detect (SPD) • Suspend to RAM • Non-ECC and ECC DIMMs NOTE ✏ To be fully compliant with all applicable DDR SDRAM memory specifications, the board should be populated with DIMMs that support the Serial Presence Detect (SPD) data structure. This allows the BIOS to read the SPD data and program the chipset to accurately configure memory settings for optimum performance. If non-SPD memory is installed, the BIOS will attempt to correctly configure the memory settings, but performance and reliability may be impacted or the DIMMs may not function under the determined frequency. NOTE ✏ For ECC functionality, all installed DIMMs must be ECC. If both ECC and non-ECC DIMMs are used, ECC will not function. For information about Refer to Obtaining DDR SDRAM specifications Section 1.5, page 19 23 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 6 lists the supported DIMM configurations. Table 6. Supported Memory Configurations DIMM Number of DDR SDRAM DDR SDRAM Organization Number of DDR Capacity Sides Density Front-side/Back-side SDRAM Devices 64 MB SS 64 Mbit 8 M x 8/empty 8 64 MB SS 128 Mbit 8 M x 16/empty 4 (Notes 1 and 2) 96 MB DS 64 Mbit 8 M x 8/4 M x 16 12 (Notes 1 and 2) 96 MB DS 128/64 Mbit 8 M x 16/4 M x 16 8 (Note 1) 128 MB DS 64 Mbit 8 M x 8/8 M x 8 16 (Notes 1 and 2) 128 MB DS 128 Mbit 8 M x 16/8 M x 16 8 128 MB SS 128 Mbit 16 M x 8/empty 8 128 MB SS 256 Mbit 16 M x 16/empty 4 (Notes 1 and 2) 192 MB DS 128 Mbit 16 M x 8/8 M x 16 12 (Notes 1 and 2) 192 MB DS 128/64 Mbit 16 M x 8/8 M x 8 16 (Notes 1 and 2) 256 MB DS 128 Mbit 16 M x 8/16 M x 8 16 (Notes 1 and 2) 256 MB DS 256 Mbit 16 M x 16/16 M x 16 8 256 MB SS 256 Mbit 32 M x 8/empty 8 (Notes 1 and 2) 512 MB DS 256 Mbit 32 M x 8/32 M x 8 16 Notes: 1. If the number of DDR SDRAM devices is greater than nine, the DIMM will be double sided. 2. Front side population/back side population indicated for DDR SDRAM density and DDR SDRAM organization. 3. In the second column, “DS” refers to double-sided memory modules (containing two rows of DDR SDRAM) and “SS” refers to single-sided memory modules (containing one row of DDR SDRAM). 24 Product Description ® 1.8 Intel 845 Chipset The Intel 845 chipset consists of the following devices: • Intel 82845 Memory Controller Hub (MCH) with Accelerated Hub Architecture (AHA) bus • Intel 82801BA I/O Controller Hub (ICH2) with AHA bus • Intel 82802AB Firmware Hub (FWH) The MCH is a centralized controller for the system bus, the memory bus, the AGP bus, and the Accelerated Hub Architecture interface. The ICH2 is a centralized controller for the board’s I/O paths. The FWH provides the nonvolatile storage of the BIOS. The component combination provides the chipset interfaces as shown in Figure 5. UDMA 33 Network ATA-66/100 System Bus USB 845 Chipset 82845 82801BA 82802AB 4 Mbit AHA Memory Controller I/O Controller Hub Firmware Hub Bus Hub (MCH) (ICH2) (FWH) LPC Bus AGP DDR SDRAM SMBus PCI Bus AC Link Bus Interface OM13069 Figure 5. Intel 845 Chipset Block Diagram NOTE ✏ The USB bus is routed from the NEC USB 2.0 controller if the USB 2.0 option is supported. For information about Refer to The Intel 845 chipset http://developer.intel.com Resources used by the chipset Chapter 2 25 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.8.1 AGP NOTE ✏ The AGP connector is keyed for 1.5 V AGP cards only. Do not attempt to install a legacy 3.3 V AGP card. The AGP connector is not mechanically compatible with legacy 3.3 V AGP cards. The AGP connector supports AGP add-in cards with 1.5 V Switching Voltage Level (SVL). Legacy 3.3 V AGP cards are not supported. For information about Refer to The location of the AGP connector Figure 1, page 14 The signal names of the AGP connector Table 36, page 68 AGP is a high-performance interface for graphics-intensive applications, such as 3D applications. While based on the PCI Local Bus Specification, Rev. 2.2, AGP is independent of the PCI bus and is intended for exclusive use with graphical display devices. AGP overcomes certain limitations of the PCI bus related to handling large amounts of graphics data with the following features: • Pipelined memory read and write operations that hide memory access latency • Demultiplexing of address and data on the bus for nearly 100 percent efficiency For information about Refer to Obtaining the Accelerated Graphics Port Interface Specification Section 1.5, page 19 26 Product Description 1.8.2 USB The following sections describe the USB port configurations implemented on the D845BG/D845PT boards. NOTE ✏ Computer systems that have an unshielded cable attached to a USB port may not meet FCC Class B requirements, even if no device is attached to the cable. Use shielded cable that meets the requirements for full-speed devices. For information about Refer to The location of the USB connectors on the back panel Figure 11, page 55 The signal names of the back panel USB connectors Table 19, page 56 The location of the front panel USB connector Figure 16, page 71 The signal names of the front panel USB connector Table 42, page 72 The front panel, UHCI, and USB specifications Section 1.5, page 19 1.8.2.1 USB 1.1 Support The D845BG/D845PT boards support up to seven USB ports, as shown in Figure 6. The ICH2 provides four ports, three of which are user-accessible: • Two ports implemented with stacked back panel connectors, adjacent to the PS/2 connectors • One port accessible through an optional CNR connector • One port routed to the SMSC USB hub The onboard SMSC USB hub provides four ports: • Two ports implemented with stacked back panel connectors, adjacent to the audio connectors • Two ports routed to the front panel USB connector For more than seven USB devices, an external hub can be connected to any of the ports. Back panel USB connectors USB USB ports (2) adjacent to the PS/2 ports 82801BA I/O Controller Hub (ICH2) USB port accesible through a USB USB CNR connector connector on an optional CNR add-in card USB Back panel USB connectors USB USB ports (2) adjacent to the audio connectors SMSC LPC47M142 LPC Bus I/O Controller Front panel USB USB USB ports (2) connectors OM12339 Figure 6. USB 1.1 Port Configuration 27 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.8.2.2 USB 2.0 Support (Optional) ✏ NOTE The USB 2.0 option is currently available only on the D845BG board. All D845BG boards with the NEC µPD720100 USB 2.0 host controller have only five PCI bus connectors. The D845BG board supports USB 2.0 using the NEC µPD720100 USB 2.0 host controller, which is a manufacturing option. The port routing is implemented as shown in Figure 7. The NEC µPD720100 controller is connected through the PCI bus and provides support for up to five USB ports: • Two ports implemented with stacked back panel connectors, adjacent to the audio connectors • Two ports routed to the front panel USB connector • One port accessible through the CNR connector For more than five USB devices, an external hub can be connected to any of the ports. D845BG boards with the USB 2.0 option fully support OHCI and EHCI and use OHCI- and EHCI-compatible drivers. ✏ NOTE The USB 2.0 option requires an operating system that officially supports USB 2.0. USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system. Back panel USB connectors USB ports (2) adjacent to the audio connectors NEC µPD720100 USB port accesible through a USB PCI USB 2.0 USB CNR connector connector on an optional CNR add-in card Host Controller USB ports (2) Front panel USB connectors OM12337 Figure 7. USB 2.0 Port Configuration (Optional) 28 Product Description 1.8.3 IDE Support 1.8.3.1 IDE Interfaces The ICH2’s IDE controller has two independent bus-mastering IDE interfaces that can be independently enabled. The IDE interfaces support the following modes: • Programmed I/O (PIO): processor controls data transfer. • 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec. • Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates of up to 33 MB/sec. • ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates of up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver compatible. • ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH2’s ATA-100 logic can achieve read transfer rates up to 100 MB/sec and write transfer rates up to 88 MB/sec. ✏ NOTE ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections, noise, and inductive coupling. The IDE interfaces also support ATAPI devices (such as CD-ROM drives) and ATA devices using the transfer modes listed in Section 4.4.4.1 on page 109. The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS. The D845BG and D845PT boards support Laser Servo (LS-120) diskette technology through the IDE interfaces. An LS-120 drive can be configured as a boot device by setting the BIOS Setup program’s Boot menu to one of the following: • ARMD-FDD (ATAPI removable media device – floppy disk drive) • ARMD-HDD (ATAPI removable media device – hard disk drive) For information about Refer to The location of the IDE connectors Figure 14, page 64 The signal names of the IDE connectors Table 38, page 70 BIOS Setup program’s Boot menu Table 74, page 117 1.8.3.2 SCSI Hard Drive Activity LED Connector The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in SCSI controller to use the same LED as the onboard IDE controller. For proper operation, this connector should be wired to the LED output of the add-in SCSI controller. The LED indicates when data is being read from, or written to, both the add-in SCSI controller and the IDE controller. For information about Refer to The location of the SCSI hard drive activity LED connector Figure 14, page 64, or Figure 15, page 65 The signal names of the SCSI hard drive activity LED connector Table 39, page 70 29 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.8.4 Real-Time Clock, CMOS SRAM, and Battery The real-time clock provides a time-of-day clock and a multicentury calendar with alarm features. The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use. A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied. The time, date, and CMOS values can be specified in the BIOS Setup program. The CMOS values can be returned to their defaults by using the BIOS Setup program. ✏ NOTE If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS RAM at power-on. ® 1.8.5 Intel 82802AB 4 Mbit Firmware Hub (FWH) The FWH provides the following: • System BIOS program • Logic that enables protection for storing and updating of platform information 1.9 I/O Controller The SMSC LPC47M142 I/O controller provides the following features: • Two serial ports • One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support • Serial IRQ interface compatible with serialized IRQ support for PCI systems • PS/2-style mouse and keyboard interfaces • Interface for one 1.2 MB or 1.44 MB diskette drive • Intelligent power management, including a programmable wake-up event interface • PCI power management support • Two fan tachometer inputs • Integrated USB hub The BIOS Setup program provides configuration options for the I/O controller. For information about Refer to SMSC LPC47M142 I/O controller http://www.smsc.com 30 Product Description 1.9.1 Serial Ports The D845BG and D845PT boards have two serial port connectors. Serial port A is located on the back panel. Serial port B is accessible using a connector located near the main power connector. The serial ports’ NS16C550-compatible UART supports data transfers at speeds up to 115.2 kbits/sec with BIOS support. The serial ports can be assigned as COM1 (3F8h), COM2 (2F8h), COM3 (3E8h), or COM4 (2E8h). For information about Refer to The location of the serial port A connector Figure 11, page 55 The signal names of the serial port A connector Table 21, page 57 The location of the serial port B connector Figure 16, page 71 The signal names of the serial port B connector Table 41, page 72 1.9.2 Parallel Port The 25-pin D-Sub parallel port connector is located on the back panel. In the BIOS Setup program, the parallel port can be set to the following modes: † • Output only (PC AT -compatible mode) • Bi-directional (PS/2 compatible) • EPP • ECP For information about Refer to The location of the parallel port connector Figure 11, page 55 The signal names of the parallel port connector Table 20, page 56 Setting the parallel port’s mode Table 65, page 106 31 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.9.3 Diskette Drive Controller The I/O controller supports one diskette drive that is compatible with the 82077 diskette drive controller and supports both PC-AT and PS/2 modes. For information about Refer to The location of the diskette drive connector Figure 14, page 64 The signal names of the diskette drive connector Table 37, page 69 The supported diskette drive capacities and sizes Table 68, page 111 1.9.4 Keyboard and Mouse Interface PS/2 keyboard and mouse connectors are located on the back panel. The +5 V lines to these † connectors are protected with a PolySwitch circuit that, like a self-healing fuse, reestablishes the connection after an overcurrent condition is removed. NOTE ✏ The keyboard is supported in the bottom PS/2 connector and the mouse is supported in the top PS/2 connector. Power to the computer should be turned off before a keyboard or mouse is connected or disconnected. The keyboard controller contains the AMI keyboard and mouse controller code, provides the keyboard and mouse control functions, and supports password protection for power-on/reset. A power-on/reset password can be specified in the BIOS Setup program. For information about Refer to The location of the keyboard and mouse connectors Figure 11, page 55 The signal names of the keyboard and mouse connectors Table 18, page 56 32 Product Description 1.10 Audio Subsystem The audio subsystem includes these features: • Split digital/analog architecture for improved S/N (signal-to-noise) ratio: ≥ 85 dB • Power management support for ACPI 2.0 (driver dependant) • Mic in pre-amp that supports dynamic, condenser, and electret microphones The audio subsystem supports the following audio interfaces: • ATAPI-style connectors:  Auxiliary line in  CD-ROM • Front panel audio connector, including pins for:  Line out  Mic in • Back panel audio connectors:  Line out  Line in  Mic in The audio subsystem consists of the following devices: • Intel 82801BA I/O Controller Hub (ICH2) • Analog Devices AD1885 audio codec Figure 8 is a block diagram of the audio subsystem. Line In Line Out 82801BA AC ’97 AD1885 I/O Controller Hub Mic In Link Audio Codec (ICH2) Auxiliary Line In CD-ROM OM13010 Figure 8. Audio Subsystem Block Diagram For information about Refer to Upgrading the onboard audio subsystem using a CNR audio card Section 1.12, page 36 The front panel audio connector Section 2.8.3, page 71 The back panel audio connectors Section 2.8.1, page 55 33 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.10.1 Audio Connectors 1.10.1.1 Front Panel Audio Connector A 2 x 5-pin connector provides mic in and line out signals for front panel audio connectors. For information about Refer to The location of the connector Section 2.8.3, page 71 The signal names of the front panel audio connector Table 40, page 72 Obtaining the Front Panel I/O Connectivity Design Guide Section 1.5, page 19 NOTE ✏ The front panel audio connector is alternately used as a jumper block for routing audio signals. Refer to Section 2.9.1 on page 75 for more information. 1.10.1.2 Auxiliary Line In Connector A 1 x 4-pin ATAPI-style connector connects the left and right channel signals of an internal audio device to the audio subsystem. For information about Refer to The location of the auxiliary line in connector Figure 12, page 59 The signal names of the auxiliary line in connector Table 27, page 60 1.10.1.3 ATAPI CD-ROM Audio Connector A 1 x 4-pin ATAPI-style connector connects an internal ATAPI CD-ROM drive to the audio mixer. For information about Refer to The location of the ATAPI CD-ROM connector Figure 12, page 59 The signal names of the ATAPI CD-ROM connector Table 27, page 60 1.10.2 Audio Subsystem Software Audio software and drivers are available from Intel’s World Wide Web site. For information about Refer to Obtaining audio software and drivers Section 1.3, page 18 34 Product Description 1.11 LAN Subsystem (Optional) The Network Interface Controller subsystem consists of the ICH2 (with integrated LAN Media Access Controller) and a physical layer interface device. Features of the LAN subsystem include: • PCI Bus Master interface • CSMA/CD Protocol Engine • Serial CSMA/CD unit interface that supports the 82562ET (10/100 Mbit/sec Ethernet) on the CNR bus • PCI Power Management  Supports ACPI technology  Supports LAN wake capabilities ® 1.11.1 Intel 82562ET Platform LAN Connect Device The Intel 82562ET component provides an interface to the back panel RJ-45 connector with integrated LEDs. This physical interface may alternately be provided through the CNR connector. The Intel 82562ET provides the following functions: • Basic 10/100 Ethernet LAN connectivity • Supports RJ-45 connector with status indicator LEDs on the back panel • Full device driver compatibility • ACPI support • Programmable transit threshold • Configuration EEPROM that contains the MAC address 1.11.2 RJ-45 LAN Connector with Integrated LEDs Two LEDs are built into the RJ-45 LAN connector. Table 7 describes the LED states when the board is powered up and the LAN subsystem is operating. Table 7. LAN Connector LED States LED Color LED State Condition Green Off 10 Mbit/sec data rate is selected. On 100 Mbit/sec data rate is selected. Yellow Off LAN link is not established. On (steady state) LAN link is established. On (brighter and pulsing) The computer is communicating with another computer on the LAN. 35 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.11.3 LAN Subsystem Software LAN software and drivers are available from Intel’s World Wide Web site. For information about Refer to Obtaining LAN software and drivers Section 1.3, page 18 1.12 CNR (Optional) The CNR connector provides an interface that supports the audio, modem, USB, and LAN interfaces of the Intel 845 chipset. Figure 9 shows the signal interface between the riser and the ICH2. AC ’97 Interface Communication and Networking Riser Intel 82801BA LAN Interface I/O Controller Hub SMBus (Up to two AC ’97 codecs (ICH2) and one LAN device) USB OM12277 Figure 9. ICH2 and CNR Signal Interface NOTE ✏ The USB bus is routed from the NEC USB 2.0 controller if the USB 2.0 option is supported. The interfaces supported by the CNR include the following: • AC ’97 interface: supports audio and/or modem functions on the CNR card. • LAN interfaces: an eight-pin interface for use with Platform LAN Connection (PLC) based devices. • SMBus interface: provides Plug-and-Play functionality for the CNR card. • USB interface: provides a USB interface for the CNR card. The CNR connector includes power signals required for power management and for CNR card operation. To learn more about the CNR, refer to the CNR specification. The onboard two-channel audio subsystem can be upgraded to four- or six-channel audio using a CNR audio upgrade card in a slave configuration. CNR audio upgrade cards are available in multiple configurations from several different vendors supporting analog or S/P-DIF digital connections. A list of vendors supplying CNR audio upgrade cards compatible with the D845BG/D845PT boards’ onboard audio subsystem, as well as an installation guide for these cards with SoundMAX with SPX are available on the following web site: http://developer.intel.com/technology/cnr/ 36 CNR Connector Product Description NOTE ✏ If you install a CNR card that cannot support a multichannel audio upgrade, the D845BG and D845PT boards’ integrated audio codec will be disabled. This only applies to D845BG and D845PT boards that have both the onboard audio subsystem and a CNR. NOTE ✏ The brand and type of audio codec used on the CNR card must match that of the D845BG/D845PT boards’ codec (Analog Devices AD1885). For information about Refer to Obtaining the CNR specification Section 1.5, page 19 1.13 Hardware Management Subsystem The hardware management features enable the boards to be compatible with the Wired for Management (WfM) specification. The board has several hardware management features, including the following: • Fan monitoring • Thermal and voltage monitoring • Chassis intrusion detection For information about Refer to The WfM specification Section 1.5, page 19 1.13.1 Hardware Monitor Component The hardware monitor component provides low-cost instrumentation capabilities. The features of the component include: • Internal ambient temperature sensing • Remote thermal diode sensing for direct monitoring of processor temperature • Power supply monitoring (+5 V, +3.3 V, +1.5 V, 3.3 VSB, and Vccp) to detect levels above or below acceptable values • SMBus interface 1.13.2 Fan Monitoring The SMSC LPC47M142 I/O controller provides two fan tachometer inputs. Monitoring can be ® implemented using Intel Active Monitor or third-party software. For information about Refer to The functions of the fan connectors Section 1.14.2.2, page 43 The location of the fan connectors Figure 13, page 61 The signal names of the fan connectors Section 2.8.2.3, page 61 37 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.13.3 Chassis Intrusion and Detection The boards support a chassis security feature that detects if the chassis cover is removed. For the chassis intrusion circuit to function, the chassis’ power supply must be connected to AC power. The security feature uses a mechanical switch on the chassis that attaches to the chassis intrusion connector. The mechanical switch is closed for normal computer operation. For information about Refer to The location of the chassis intrusion connector Figure 13, page 61 The signal names of the chassis intrusion connector Table 33, page 63 NOTE ✏ Chassis intrusion detection may be implemented using Intel Active Monitor or third-party software. 1.14 Power Management Power management is implemented at several levels, including: • Software support through Advanced Configuration and Power Interface (ACPI) • Hardware support:  Power connector  Fan connectors  LAN wake capabilities  Instantly Available PC technology  Resume on Ring  Wake from USB  Wake from PS/2 devices  Power Management Event (PME#) wake-up support 1.14.1 ACPI ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with the D845BG and D845PT boards requires an operating system that provides full ACPI support. ACPI features include: • Plug and Play (including bus and device enumeration) • Power management control of individual devices, add-in boards (some add-in boards may require an ACPI-aware driver), video displays, and hard disk drives • Methods for achieving less than 15-watt system operation in the power-on/standby sleeping state • A Soft-off feature that enables the operating system to power-off the computer • Support for multiple wake-up events (see Table 10 on page 41) • Support for a front panel power and sleep mode switch 38 Product Description Table 8 lists the system states based on how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware operating system. Table 8. Effects of Pressing the Power Switch …and the power switch is If the system is in this state… pressed for …the system enters this state Off Less than four seconds Power-on (ACPI G2/G5 – Soft off) (ACPI G0 – working state) On Less than four seconds Soft-off/Standby (ACPI G0 – working state) (ACPI G1 – sleeping state) On More than four seconds Fail safe power-off (ACPI G0 – working state) (ACPI G2/G5 – Soft off) Sleep Less than four seconds Wake-up (ACPI G1 – sleeping state) (ACPI G0 – working state) Sleep More than four seconds Power-off (ACPI G1 – sleeping state) (ACPI G2/G5 – Soft off) For information about Refer to The D845BG and D845PT boards’ compliance level with ACPI Section 1.5, page 19 39 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.14.1.1 System States and Power States Under ACPI, the operating system directs all system and device power state transitions. The operating system puts devices in and out of low-power states based on user preferences and knowledge of how devices are being used by applications. Devices that are not being used can be turned off. The operating system uses information from applications and user settings to put the system as a whole into a low-power state. Table 9 lists the power states supported by the D845BG and D845PT boards along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states. Table 9. Power States and Targeted System Power Processor Targeted System (Note 1) Global States Sleeping States States Device States Power G0 – working S0 – working C0 – working D0 – working Full power > 30 W state state. G1 – sleeping S1 – Processor C1 – stop D1, D2, D3 – 5 W < power < 52.5 W state stopped grant device specification specific. (Note 2) G1 – sleeping S3 – Suspend to No power D3 – no power Power < 5 W state RAM. Context except for saved to RAM. wake-up logic. (Note 2) G1 – sleeping S4 – Suspend to No power D3 – no power Power < 5 W state disk. Context except for saved to disk. wake-up logic. (Note 2) G2/S5 S5 – Soft off. No power D3 – no power Power < 5 W Context not saved. except for Cold boot is wake-up logic. required. G3 – No power to the No power D3 – no power for No power to the system. mechanical off system. wake-up logic, Service can be performed except when safely. AC power is provided by disconnected battery or external from the source. computer. Notes: 1. Total system power is dependent on the system configuration, including add-in boards and peripherals powered by the system chassis’ power supply. 2. Dependent on the standby power consumption of wake-up devices used in the system. 40 Product Description 1.14.1.2 Wake-up Devices and Events Table 10 lists the devices or specific events that can wake the computer from specific states. Table 10. Wake-up Devices and Events These devices/events can wake up the computer… …from this state Power switch S1, S3, S4, S5 RTC alarm S1, S3, S4, S5 (Note 1) LAN S1, S3, S4, S5 (Note 2) (Note 2) CNR S1, S3, S4 , S5 PME# S1, S3, S4, S5 Modem (back panel Serial Port A) S1, S3 USB S1, S3 PS/2 devices S1, S3 Notes: 1. For LAN and PME#, S5 is disabled by default in the BIOS Setup program. Setting this option to Power On will enable a wake-up event from LAN in the S5 state. 2. Except from the CNR’s USB interface. NOTE ✏ The use of these wake-up events from an ACPI state requires an operating system that provides full ACPI support. In addition, software, drivers, and peripherals must fully support ACPI wake events. 1.14.1.3 Plug and Play In addition to power management, ACPI provides control information so that operating systems can facilitate Plug and Play. ACPI is used only to configure devices that do not use other hardware configuration standards. PCI devices for example, are not configured by ACPI. 41 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.14.2 Hardware Support CAUTION Ensure that the power supply provides adequate +5 V standby current if LAN wake capabilities and Instantly Available PC technology features are used. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options. Refer to Section 2.11.3 on page 83 for additional information. The D845BG and D845PT boards provide several power management hardware features, including: • Power connector • Fan connectors • LAN wake capabilities • Instantly Available PC technology • Resume on Ring • Wake from USB • Wake from PS/2 keyboard • PME# wake-up support LAN wake capabilities and Instantly Available PC technology require power from the +5 V standby line. The sections discussing these features describe the incremental standby power requirements for each. Resume on Ring enables telephony devices to access the computer when it is in a power-managed state. The method used depends on the type of telephony device (external or internal). NOTE ✏ The use of Resume on Ring and Wake from USB technologies from an ACPI state requires an operating system that provides full ACPI support. 1.14.2.1 Power Connector When used with an ATX12V- or SFX12V-compliant power supply that supports remote power on/off, the D845BG and D845PT boards can turn off the system power through software control. When the system BIOS receives the correct command from the operating system, the BIOS turns off power to the computer. With soft-off enabled, if power to the computer is interrupted by a power outage or a disconnected power cord, when power resumes, the computer returns to the power state it was in before power was interrupted (on or off). The computer’s response can be set using the After Power Failure feature in the BIOS Setup program’s Boot menu. For information about Refer to The location of the power connector Figure 13, page 61 The signal names of the power connector Table 31, page 63 The BIOS Setup program’s Boot menu Table 74, page 117 The ATX and SFX specifications Section 1.5, page 19 42 Product Description 1.14.2.2 Fan Connectors Table 11 summarizes the function/operation of the fan connectors. Table 11. Fan Connector Function/Operation Connector Description Processor fan • +12 V DC connection for a processor fan or active fan heatsink. • Fan is on in the S0 or S1 state. Fan is off when the system is off or in the S3, S4, or S5 state. • Wired to a fan tachometer input of the SMSC LPC47M142 I/O controller. Front chassis fan • +12 V DC connection for a system or chassis fan. • Fan is on in the S0 or S1 state. Fan is off when the system is off or in the S3, S4, or S5 state. • Wired to a fan tachometer input of the SMSC LPC47M142 I/O controller. Rear chassis fan • +12 V DC connection for a system or chassis fan. • Fan is on in the S0 or S1 state. Fan is off when the system is off or in the S3, S4, or S5 state. For information about Refer to The location of the fan connectors Figure 13, page 61 The signal names of the fan connectors Section 2.8.2.3, page 61 1.14.2.3 LAN Wake Capabilities CAUTION For LAN wake capabilities, the 5-V standby line for the power supply must be capable of providing adequate +5 V standby current. Failure to provide adequate standby current when implementing LAN wake capabilities can damage the power supply. Refer to Section 2.11.3 on page 83 for additional information. LAN wake capabilities enable remote wake-up of the computer through a network. The LAN subsystem PCI bus network adapter monitors network traffic at the Media Independent Interface. † Upon detecting a Magic Packet frame, the LAN subsystem asserts a wake-up signal that powers up the computer. Depending on the LAN implementation, the D845BG and D845PT boards support LAN wake capabilities with ACPI in the following ways: • the PCI bus PME# signal for PCI 2.2 compliant LAN designs • the onboard LAN subsystem • a CNR-based LAN subsystem 43 Intel Desktop Board D845BG/D845PT Technical Product Specification 1.14.2.4 Instantly Available PC Technology CAUTION For Instantly Available PC technology, the +5 V standby line for the power supply must be capable of providing adequate +5 V standby current. Failure to provide adequate standby current when implementing Instantly Available PC technology can damage the power supply. Refer to Section 2.11.3 on page 83 for additional information. Instantly Available PC technology enables the D845BG and D845PT boards to enter the ACPI S3 (Suspend-to-RAM) sleep-state. While in the S3 sleep-state, the computer will appear to be off (the power supply is off, and the front panel LED is amber if dual colored, or off if single colored.) When signaled by a wake-up device or event, the system quickly returns to its last known wake state. Table 10 on page 41 lists the devices and events that can wake the computer from the S3 state. The D845BG and D845PT boards support the PCI Bus Power Management Interface Specification. For information on the versions of this specification, see Section 1.5. Add-in boards that also support this specification can participate in power management and can be used to wake the computer. The use of Instantly Available PC technology requires operating system support and PCI 2.2 compliant add-in cards and drivers. The standby power indicator LED shows that power is still present even when the computer appears to be off. Figure 10 shows the location of the standby power indicator LED. CAUTION If AC power has been switched off and the standby power indicator is still lit, disconnect the power cord before installing or removing any devices connected to the board. Failure to do so could damage the board and any attached devices. CR3H1 OM12987 Figure 10. Location of the Standby Power Indicator LED 44 Product Description 1.14.2.5 Resume on Ring The operation of Resume on Ring can be summarized as follows: • Resumes operation from ACPI S1 or S3 states • Requires only one call to access the computer • Detects incoming call similarly for external and internal modems • Requires modem interrupt be unmasked for correct operation 1.14.2.6 Wake from USB USB bus activity wakes the computer from an ACPI S1 or S3 state. NOTE ✏ Wake from USB requires the use of a USB peripheral that supports Wake from USB. 1.14.2.7 Wake from PS/2 Devices PS/2 device activity wakes the computer from an ACPI S1 or S3 state. 1.14.2.8 PME# Wake-up Support When the PME# signal on the PCI bus is asserted, the computer wakes from an ACPI S1, S3, S4, or S5 state (with Wake on PME enabled in BIOS). 45 Intel Desktop Board D845BG/D845PT Technical Product Specification 46 2 Technical Reference What This Chapter Contains 2.1 Introduction.................................................................................................................47 2.2 Memory Map ..............................................................................................................47 2.3 I/O Map .....................................................................................................................48 2.4 DMA Channels ...........................................................................................................50 2.5 PCI Configuration Space Map ....................................................................................50 2.6 Interrupts ....................................................................................................................51 2.7 PCI Interrupt Routing Map..........................................................................................52 2.8 Connectors.................................................................................................................54 2.9 Jumper Blocks............................................................................................................75 2.10 Mechanical Considerations.........................................................................................77 2.11 Electrical Considerations ............................................................................................82 2.12 Thermal Considerations..............................................................................................85 2.13 Reliability ....................................................................................................................87 2.14 Environmental ............................................................................................................87 2.15 Regulatory Compliance ..............................................................................................88 2.1 Introduction Sections 2.2 - 2.6 contain several standalone tables. Table 12 describes the system memory map, Table 13 shows the I/O map, Table 14 lists the DMA channels, Table 15 defines the PCI configuration space map, and Table 16 describes the interrupts. The remaining sections in this chapter are introduced by text found with their respective section headings. 2.2 Memory Map Table 12. System Memory Map Address Range (decimal) Address Range (hex) Size Description 1024 K - 2097152 K 100000 - 7FFFFFFF 2047 MB Extended memory 960 K - 1024 K F0000 - FFFFF 64 KB Runtime BIOS 896 K - 960 K E0000 - EFFFF 64 KB Reserved 800 K - 896 K C8000 - DFFFF 96 KB Available high DOS memory (open to the PCI bus) 640 K - 800 K A0000 - C7FFF 160 KB Video memory and BIOS 639 K - 640 K 9FC00 - 9FFFF 1 KB Extended BIOS data (movable by memory manager software) 512 K - 639 K 80000 - 9FBFF 127 KB Extended conventional memory 0 K - 512 K 00000 - 7FFFF 512 KB Conventional memory 47 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.3 I/O Map Table 13. I/O Map Address (hex) Size Description 0000 - 000F 16 bytes DMA controller 0020 - 0021 2 bytes Programmable Interrupt Control (PIC) 0040 - 0043 4 bytes System timer 0060 1 byte Keyboard controller byte—reset IRQ 0061 1 byte System speaker 0064 1 byte Keyboard controller, CMD/STAT byte 0070 - 0071 2 bytes System CMOS/Real Time Clock 0072 - 0073 2 bytes System CMOS 0080 - 008F 16 bytes DMA controller 0092 1 byte Fast A20 and PIC 00A0 - 00A1 2 bytes PIC 00B2 - 00B3 2 bytes APM control 00C0 - 00DF 32 bytes DMA 00F0 1 byte Numeric data processor 0170 - 0177 8 bytes Secondary IDE channel 01F0 - 01F7 8 bytes Primary IDE channel (Note 1) 0228 - 022F 8 bytes LPT3 (Note 1) 0278 - 027F 8 bytes LPT2 (Note 1) 02E8 - 02EF 8 bytes COM4/video (8514A) (Note 1) 02F8 - 02FF 8 bytes COM2 0376 1 byte Secondary IDE channel command port 0377, bits 6:0 7 bits Secondary IDE channel status port 0378 - 037F 8 bytes LPT1 03B0 - 03BB 12 bytes Intel 82845 MCH 03C0 - 03DF 32 bytes Intel 82845 MCH 03E8 - 03EF 8 bytes COM3 03F0 - 03F5 6 bytes Diskette channel 1 03F6 1 byte Primary IDE channel command port 03F8 - 03FF 8 bytes COM1 04D0 - 04D1 2 bytes Edge/level triggered PIC LPTn + 400 8 bytes ECP port, LPTn base address + 400h (Note 2) 0CF8 - 0CFB 4 bytes PCI configuration address register (Note 3) 0CF9 1 byte Turbo and reset control register 0CFC - 0CFF 4 bytes PCI configuration data register FFA0 - FFA7 8 bytes Primary bus master IDE registers FFA8 - FFAF 8 bytes Secondary bus master IDE registers continued 48 Technical Reference Table 13. I/O Map (continued) Address (hex) Description (Note 4) 8 bytes on an 8-byte boundary OHCI controller 96 contiguous bytes starting on a 128-byte ICH2 (ACPI + TCO) divisible boundary 64 contiguous bytes starting on a 64-byte D845BG/D845PT board resource divisible boundary 64 contiguous bytes starting on a 64-byte Onboard audio controller divisible boundary 32 contiguous bytes starting on a 32-byte ICH2 (USB controller 1) (Note 5) divisible boundary 16 contiguous bytes starting on a 16-byte ICH2 (SMBus) divisible boundary 4096 contiguous bytes starting on a 4096-byte Intel 82801BA PCI bridge divisible boundary 256 contiguous bytes starting on a 256-byte ICH2 audio mixer divisible boundary 64 contiguous bytes starting on a 64-byte ICH2 audio bus mixer divisible boundary 256 contiguous bytes starting on a 256-byte ICH2 modem mixer divisible boundary 32 contiguous bytes starting on a 32-byte ICH2 (USB controller 2) (Note 5) divisible boundary 96 contiguous bytes starting on a 128-byte LPC47M142 divisible boundary Notes: 1. Default, but can be changed to another address range 2. Dword access only 3. Byte access only 4. USB 2.0 option only 5. USB 1.1 option only ✏ NOTE Some additional I/O addresses are not available due to ICH2 address aliassing. For information about Refer to ICH2 addressing Section 1.3 on page 18 49 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.4 DMA Channels Table 14. DMA Channels DMA Channel Number Data Width System Resource 0 8 or 16 bits Open 1 8 or 16 bits Parallel port 2 8 or 16 bits Diskette drive 3 8 or 16 bits Parallel port (for ECP or EPP) 4 8 or 16 bits DMA controller 5 16 bits Open 6 16 bits Open 7 16 bits Open 2.5 PCI Configuration Space Map Table 15. PCI Configuration Space Map Bus Device Function Number (hex) Number (hex) Number (hex) Description 00 00 00 Memory controller of Intel 82845 component 00 01 00 PCI to AGP bridge 00 1E 00 Hub link to PCI bridge 00 1F 00 Intel 82801BA ICH2 PCI to LPC bridge 00 1F 01 IDE controller 00 1F 02 USB 00 1F 03 SMBus controller 00 1F 04 USB 00 1F 05 AC ’97 audio controller 00 1F 06 AC ’97 modem controller (optional) 01 00 00 Add-in AGP adapter card (Note 1) 02 00 01 OHCI controller 1 (Note 1) 02 00 02 OHCI controller 2 (Note 1) 02 00 03 EHCI controller 02 08 00 LAN controller (optional) 02 09 00 PCI bus connector 1 02 0A 00 PCI bus connector 2 02 0B 00 PCI bus connector 3 (Note 2) 02 0C 00 PCI bus connector 4 (Note 2) 02 0D 00 PCI bus connector 5 (Note 2) 02 0E 00 PCI bus connector 6 Notes: 1. USB 2.0 option only 2. D845BG board only 50 Technical Reference 2.6 Interrupts The interrupts can be routed through either the Programmable Interrupt Controller (PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the ICH2 component. The PIC is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts. The APIC is supported in Windows 2000 and Windows XP and supports a total of 24 interrupts. Table 16. Interrupts IRQ System Resource NMI I/O channel check 0 Reserved, interval timer 1 Reserved, keyboard buffer full 2 Reserved, cascade interrupt from slave PIC (Note 1) 3 COM2 (Note 1) 4 COM1 5 LPT2 (Plug and Play option)/User available 6 Diskette drive (Note 1) 7 LPT1 8 Real-time clock 9 Reserved for ICH2 system management bus 10 User available 11 User available 12 Onboard mouse port (if present, else user available) 13 Reserved, math coprocessor 14 Primary IDE (if present, else user available) 15 Secondary IDE (if present, else user available) (Note 2) 16 (through PIRQA) AGP video (Note 2) 17 (through PIRQB) AC ’97 audio/User available (Note 2) 18 (through PIRQC) OHCI controller 1 (optional) (Note 2) 19 (through PIRQD) ICH2 USB controller 1 (Note 2) 20 (through PIRQE) ICH2 LAN (optional) (Note 2) 21 (through PIRQF) OHCI controller 2 (optional)/User available (Note 2) 22 (through PIRQG) EHCI controller 1 (optional)/User available (Note 2) 23 (through PIRQH) ICH2 USB controller 2/User available Notes: 1. Default, but can be changed to another IRQ. 2. Available in APIC mode only. 51 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.7 PCI Interrupt Routing Map This section describes interrupt sharing and how the interrupt signals are connected between the PCI bus connectors and onboard PCI devices. The PCI specification specifies how interrupts can be shared between devices attached to the PCI bus. In most cases, the small amount of latency added by interrupt sharing does not affect the operation or throughput of the devices. In some special cases where maximum performance is needed from a device, a PCI device should not share an interrupt with other PCI devices. Use the following information to avoid sharing an interrupt with a PCI add-in card. PCI devices are categorized as follows to specify their interrupt grouping: • INTA: By default, all add-in cards that require only one interrupt are in this category. For almost all cards that require more than one interrupt, the first interrupt on the card is also classified as INTA. • INTB: Generally, the second interrupt on add-in cards that require two or more interrupts is classified as INTB. (This is not an absolute requirement.) • INTC and INTD: Generally, a third interrupt on add-in cards is classified as INTC and a fourth interrupt is classified as INTD. The ICH2 has eight programmable interrupt request (PIRQ) input signals. All PCI interrupt sources either onboard or from a PCI add-in card connect to one of these PIRQ signals. Some PCI interrupt sources are electrically tied together on the D845BG and D845PT boards and therefore share the same interrupt. Table 17 shows an example of how the PIRQ signals are routed on the D845BG and D845PT boards. For example, using Table 17 as a reference, assume an add-in card using INTB is plugged into PCI bus connector 3. In PCI bus connector 3, INTB is connected to PIRQB, which is already connected to the SMBus. The add-in card in PCI bus connector 3 now shares interrupts with these onboard interrupt sources. 52 Technical Reference Table 17. PCI Interrupt Routing Map ICH2 PIRQ Signal Name PCI Interrupt Source PIRQF PIRQG PIRQH PIRQB Other AGP connector INTB INTA to PIRQA ICH2 USB controller 1 INTD to PIRQD SMBus controller INTB ICH2 USB controller 2 INTC ICH2 Audio/Modem INTB ICH2 LAN INTA to PIRQE (Note 1) OHCI controller 1 INTA to PIRQC (Note 1) OHCI controller 2 INTB (Note 1) EHCI controller INTC PCI bus connector 1 INTA INTB INTC INTD PCI bus connector 2 INTD INTA INTB INTC PCI bus connector 3 INTC INTD INTA INTB (Note 2) PCI bus connector 4 INTB INTC INTD INTA (Note 2) PCI bus connector 5 INTA INTB INTC INTD (Note 2) PCI bus connector 6 INTB INTC INTD INTA Notes: 1. USB 2.0 option only 2. D845BG board only NOTE ✏ In PIC mode, the ICH2 can connect each PIRQ line internally to one of the IRQ signals (3, 4, 5, 6, 7, 9, 10, 11, 12, 14, and 15). Typically, a device that does not share a PIRQ line will have a unique interrupt. However, in certain interrupt-constrained situations, it is possible for two or more of the PIRQ lines to be connected to the same IRQ signal. Refer to Table 16 for the allocation of PIRQ lines to IRQ signals in APIC mode. 53 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.8 Connectors CAUTION Only the back panel, the front panel audio, and the front panel USB connectors of the D845BG and D845PT boards have overcurrent protection. The D845BG and D845PT boards’ internal connectors are not overcurrent protected and should connect only to devices inside the computer’s chassis, such as fans and internal peripherals. Do not use these connectors to power devices external to the computer’s chassis. A fault in the load presented by the external devices could cause damage to the computer, the interconnecting cable, and the external devices themselves. This section describes the board’s connectors. The connectors can be divided into the following groups: • Back panel I/O connectors (see page 55)  PS/2 keyboard and mouse  USB (four with the USB 1.1 option, two with USB 2.0)  Parallel port  Serial port A  LAN (optional)  Audio (line out, line in, and mic in) • Internal I/O connectors (see page 58)  Audio (auxiliary line input and ATAPI CD-ROM)  Fans  Power  Add-in boards (PCI and AGP)  CNR (optional)  IDE  Diskette drive  SCSI LED • External I/O connectors (see page 71)  Front panel audio  Front panel USB  Serial port B  Auxiliary front panel power/sleep/message-waiting LED  Front panel (power/sleep/message-waiting LED, power switch, hard drive activity LED, reset switch, and auxiliary front panel power LED) NOTE ✏ When installing the board in a microATX chassis, make sure that peripheral devices are installed at least 1.5 inches above the main power connector, the diskette drive connector, the IDE connector, and the DIMM sockets. 54 Technical Reference 2.8.1 Back Panel Connectors Figure 11 shows the location of the back panel connectors. The back panel connectors are color-coded in compliance with PC 99 recommendations. The figure legend below lists the colors used. A F G C BEDH IJ K L OM12988 Item Description Color For more information see: A PS/2 mouse port Green Table 18 B PS/2 keyboard port Purple Table 18 C USB port (optional) Black Table 19 D USB port (optional) Black Table 19 E Serial port A Teal Table 21 F Parallel port Burgundy Table 20 G LAN (optional) Black Table 22 H USB port Black Table 19 I USB port Black Table 19 J Mic in Pink Table 25 K Audio line out Lime green Table 24 L Audio line in Light blue Table 23 Figure 11. Back Panel Connectors NOTE ✏ The USB ports adjacent to the PS/2 ports are not populated if the USB 2.0 option is supported. NOTE ✏ The back panel audio line out connector is designed to power headphones or amplified speakers only. Poor audio quality occurs if passive (non-amplified) speakers are connected to this output. 55 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 18. PS/2 Mouse/Keyboard Connector Pin Signal Name 1 Data 2 Not connected 3 Ground 4 +5 V (Fused) 5 Clock 6 Not connected Table 19. USB Connectors Pin Signal Name 1 +5 V (Fused) 2 USB# 3 USB 4 Ground Table 20. Parallel Port Connector Pin Standard Signal Name ECP Signal Name EPP Signal Name 1 STROBE# STROBE# WRITE# 2 PD0 PD0 PD0 3 PD1 PD1 PD1 4 PD2 PD2 PD2 5 PD3 PD3 PD3 6 PD4 PD4 PD4 7 PD5 PD5 PD5 8 PD6 PD6 PD6 9 PD7 PD7 PD7 10 ACK# ACK# INTR 11 BUSY BUSY#, PERIPHACK WAIT# 12 PERROR PE, ACKREVERSE# PE 13 SELECT SELECT SELECT 14 AUDOFD# AUDOFD#, HOSTACK DATASTB# 15 FAULT# FAULT#, PERIPHREQST# FAULT# 16 INIT# INIT#, REVERSERQST# RESET# 17 SLCTIN# SLCTIN# ADDRSTB# 18 – 25 Ground Ground Ground 56 Technical Reference Table 21. Serial Port A Connector Pin Signal Name 1 DCD (Data Carrier Detect) 2 RXD# (Receive Data) 3 TXD# (Transmit Data) 4 DTR (Data Terminal Ready) 5 Ground 6 DSR (Data Set Ready) 7 RTS (Request to Send) 8 CTS (Clear to Send) 9 RI (Ring Indicator) Table 22. LAN Connector (Optional) Pin Signal Name 1 TX+ 2 TX- 3 RX+ 4 Ground 5 Ground 6 RX- 7 Ground 8 Ground Table 23. Audio Line In Connector Pin Signal Name Tip Audio left in Ring Audio right in Sleeve Ground Table 24. Audio Line Out Connector Pin Signal Name Tip Audio left out Ring Audio right out Sleeve Ground Table 25. Mic In Connector Pin Signal Name Tip Mono in Ring Mic bias voltage Sleeve Ground 57 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.8.2 Internal I/O Connectors The internal I/O connectors are divided into the following functional groups: • Audio (see page 59)  Auxiliary line in  ATAPI CD-ROM • Power and hardware control (see page 61)  Fans (three)  ATX12V  Main power • Add-in boards and peripheral interfaces (see page 64)  CNR (communication and networking riser)  PCI bus (six on the D845BG board; three on the D845PT board)  AGP  IDE (two)  Diskette drive  SCSI LED 2.8.2.1 Expansion Slots The board has the following expansion slots: • One AGP connector. The AGP connector is keyed for 1.5 V AGP cards only. Do not install a legacy 3.3 V AGP card. The AGP connector is not mechanically compatible with legacy 3.3 V AGP cards. • PCI rev 2.2 compliant local bus slots (six on the D845BG board, three on the D845PT board). The SMBus is routed to PCI bus connector 1 only (ATX expansion slot 6). PCI add-in cards with SMBus support can access sensor data and other information residing on the board. • One CNR (optional), shared with PCI bus connector 3 (ATX expansion slot 1) on the D845PT board or with PCI bus connector 6 (ATX expansion slot 1) on the D845BG board. NOTE ✏ This document references back-panel slot numbering with respect to processor location on the board. The AGP slot is not numbered. PCI slots are identified as PCI slot #x, starting with the slot closest to the processor. The CNR slot shares an ATX expansion; slot 6 on the D845BG board and slot 3 on the D845PT. The ATX/MicroATX specifications identify expansion slot locations with respect to the far edge of a full-sized ATX chassis. The ATX specification and the board’s silkscreen are opposite and could cause confusion. The ATX numbering convention is made without respect to slot type (PCI vs. AGP), but refers to an actual slot location on a chassis. Figure 14 on page 64 illustrates the board’s PCI slot numbering. 58 Technical Reference 2.8.2.2 Audio Connectors Figure 12 shows the location of the audio connectors. A B 4 1 4 1 OM12989 Item Description Color For more information see: A Auxiliary line in, ATAPI style White Table 26 B ATAPI CD-ROM Black Table 27 Figure 12. Audio Connectors NOTE ✏ The front panel audio connector is described in Section 2.8.3, beginning on page 71. 59 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 26. Auxiliary Line In Connector Pin Signal Name 1 Left auxiliary line in 2 Ground 3 Ground 4 Right auxiliary line in Table 27. ATAPI CD-ROM Connector Pin Signal Name 1 Left audio input from CD-ROM 2 CD audio differential ground 3 CD audio differential ground 4 Right audio input from CD-ROM 60 Technical Reference 2.8.2.3 Power and Hardware Control Connectors Figure 13 shows the location of the power and hardware control connectors. A B 1 2 4 1 3 1 C 1 F 11 20 D 10 1 E 1 OM12990 Item Description For more information see: A +12 V power connector (ATX12V) Table 28 B Rear chassis fan Table 29 C Processor fan Table 30 D Main power Table 31 E Front chassis fan Table 32 F Chassis intrusion Table 33 Figure 13. Power and Hardware Control Connectors For information about Refer to The power connector Section 1.14.2.1, page 42 The functions of the fan connectors Section 1.14.2.2, page 43 NOTE ✏ Use only ATX12V- or SFX12V-compliant power supplies with the D845BG and D845PT boards. ATX12V and SFX12V power supplies have an additional power lead that provides required supplemental power for the Intel Pentium 4 processor. Always connect the 20-pin and 4-pin leads of ATX12V and SFX12V power supplies to the corresponding connectors on the D845BG and D845PT boards, otherwise the board will not boot. 61 Intel Desktop Board D845BG/D845PT Technical Product Specification Do not use a standard ATX power supply. The board will not boot with a standard ATX power supply. Table 28. ATX12V Power Connector Pin Signal Name Pin Signal Name 1 Ground 2 Ground 3 +12 V 4 +12 V NOTE ✏ The board will not boot if the ATX12V power connector is not attached to the board. Table 29. Rear Chassis Fan Connector Pin Signal Name 1 Ground 2 VREG_12V_POWER 3 REAR_FAN_TACH Table 30. Processor Fan Connector Pin Signal Name 1 Ground 2 VREG_12V_POWER 3 CPU_FAN_TACH 62 Technical Reference Table 31. Main Power Connector Pin Signal Name Pin Signal Name 1 +3.3 V 11 +3.3 V 2 +3.3 V 12 -12 V 3 Ground 13 Ground 4 +5 V 14 PS-ON# (power supply remote on/off) 5 Ground 15 Ground 6 +5 V 16 Ground 7 Ground 17 Ground 8 PWRGD (Power Good) 18 No connect 9 +5 V (Standby) 19 +5 V 10 +12 V 20 +5 V Table 32. Front Chassis Fan Connector Pin Signal Name 1 Ground 2 +12 V 3 No connect Table 33. Chassis Intrusion Connector Pin Signal Name 1 Intruder 2 Ground 63 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.8.2.4 Add-in Board and Peripheral Interface Connectors Figure 14 shows the location of the add-in board connector and peripheral connectors for the D845BG board. Note the following considerations for the PCI bus connectors (for both boards): • All of the PCI bus connectors are bus master capable. • PCI bus connector 1 has SMBus signals routed to it. This enables PCI bus add-in boards with SMBus support to access sensor data on the board. The specific SMBus signals are as follows:  The SMBus clock line is connected to pin A40  The SMBus data line is connected to pin A41 A B C D E F G H 2 40 1 39 2 40 1 39 2 34 1 1 33 L K J I OM13002 Item Description For more information see: A Communication and Networking Riser (CNR) Table 34 B PCI bus connector 6 Table 35 C PCI bus connector 5 Table 35 D PCI bus connector 4 Table 35 E PCI bus connector 3 Table 35 F PCI bus connector 2 Table 35 G PCI bus connector 1 Table 35 H AGP connector Table 36 I Diskette drive Table 37 J Primary IDE Table 38 K Secondary IDE Table 38 L SCSI LED Table 39 Figure 14. D845BG Add-in Board and Peripheral Interface Connectors 64 Technical Reference Figure 15 shows the location of the add-in board connector and peripheral connectors for the D845PT board. A B C D E 2 40 1 39 2 40 39 1 2 34 1 1 33 I H G F OM12991 Item Description For more information see: A Communication and Networking Riser (CNR) Table 34 B PCI bus connector 3 Table 35 C PCI bus connector 2 Table 35 D PCI bus connector 1 Table 35 E AGP connector Table 36 F Diskette drive Table 37 G Primary IDE Table 38 H Secondary IDE Table 38 I SCSI LED Table 39 Figure 15. D845PT Add-in Board and Peripheral Interface Connectors 65 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 34. CNR Connector (Optional) Pin Signal Name Pin Signal Name A1 Reserved B1 Reserved A2 Reserved B2 Reserved A3 Ground B3 Reserved A4 Reserved B4 Ground A5 Reserved B5 Reserved A6 Ground B6 Reserved A7 LAN_TXD2 B7 Ground A8 LAN_TXD0 B8 LAN_TXD1 A9 Ground B9 LAN_RSTSYNC A10 LAN_CLK B10 Ground A11 LAN_RXD1 B11 LAN_RXD2 A12 Reserved B12 LAN_RXD0 A13 USB+ B13 Ground A14 Ground B14 Reserved A15 USB- B15 +5 V (dual) A16 +12 V B16 USB_OC A17 Ground B17 Ground A18 +3.3 V (dual) B18 -12 V A19 +5 V B19 +3.3 V A20 Ground B20 Ground A21 EEDI B21 EED0 A22 EECS B22 EECK A23 SMB_A1 B23 Ground A24 SMB_A2 B24 SMB_A0 A25 SMB_SDA B25 SMB_SCL A26 AC97_RESET B26 CDC_DWN_ENAB A27 Reserved B27 Ground A28 AC97_SDATA_IN1 B28 AC97_SYNC A29 AC97_SDATA_IN0 B29 AC97_SDATA_OUT A30 Ground B30 AC97_BITCLK For information about Refer to The CNR Section 1.12, page 36 66 Technical Reference Table 35. PCI Bus Connectors Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name A1 Ground (TRST#)* B1 -12 V A32 AD16 B32 AD17 A2 +12 V B2 Ground (TCK)* A33 +3.3 V B33 C/BE2# A3 +5 V (TMS)* B3 Ground A34 FRAME# B34 Ground A4 +5 V (TDI)* B4 Not connected (TDO)* A35 Ground B35 IRDY# A5 +5 V B5 +5 V A36 TRDY# B36 +3.3 V A6 INTA# B6 +5 V A37 Ground B37 DEVSEL# A7 INTC# B7 INTB# A38 STOP# B38 Ground A8 +5 V B8 INTD# A39 +3.3 V B39 LOCK# A9 Reserved B9 Not connected A40 Reserved ** B40 PERR# (PRSNT1#)* A10 +5 V (I/O) B10 Reserved A41 Reserved *** B41 +3.3 V A11 Reserved B11 Not connected A42 Ground B42 SERR# (PRSNT2#)* A12 Ground B12 Ground A43 PAR B43 +3.3 V A13 Ground B13 Ground A44 AD15 B44 C/BE1# A14 +3.3 V aux B14 Reserved A45 +3.3 V B45 AD14 A15 RST# B15 Ground A46 AD13 B46 Ground A16 +5 V (I/O) B16 CLK A47 AD11 B47 AD12 A17 GNT# B17 Ground A48 Ground B48 AD10 A18 Ground B18 REQ# A49 AD09 B49 Ground A19 PME# B19 +5 V (I/O) A50 Key B50 Key A20 AD30 B20 AD31 A51 Key B51 Key A21 +3.3 V B21 AD29 A52 C/BE0# B52 AD08 A22 AD28 B22 Ground A53 +3.3 V B53 AD07 A23 AD26 B23 AD27 A54 AD06 B54 +3.3 V A24 Ground B24 AD25 A55 AD04 B55 AD05 A25 AD24 B25 +3.3 V A56 Ground B56 AD03 A26 IDSEL B26 C/BE3# A57 AD02 B57 Ground A27 +3.3 V B27 AD23 A58 AD00 B58 AD01 A28 AD22 B28 Ground A59 +5 V (I/O) B59 +5 V (I/O) A29 AD20 B29 AD21 A60 REQ64# B60 ACK64# A30 Ground B30 AD19 A61 +5 V B61 +5 V A31 AD18 B31 +3.3 V A62 +5 V B62 +5 V * These signals (in parentheses) are optional in the PCI specification and are not currently implemented. ** On PCI bus connector 1, this pin is connected to the SMBus clock line. *** On PCI bus connector 1, this pin is connected to the SMBus data line. 67 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 36. AGP Connector Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name A1 +12 V B1 Not connected A34 Vddq B34 Vddq A2 TYPEDET# B2 +5 V A35 AD22 B35 AD21 A3 Reserved B3 +5 V A36 AD20 B36 AD19 A4 Not connected B4 Not connected A37 Ground B37 Ground A5 Ground B5 Ground A38 AD18 B38 AD17 A6 INTA# B6 INTB# A39 AD16 B39 C/BE2# A7 RST# B7 CLK A40 Vddq B40 Vddq A8 GNT1# B8 REQ# A41 FRAME# B41 IRDY# A9 Vcc3.3 B9 Vcc3.3 A42 Reserved B42 +3.3 V (aux) A10 ST1 B10 ST0 A43 Ground B43 Ground A11 Reserved B11 ST2 A44 Reserved B44 Reserved A12 PIPE# B12 RBF# A45 Vcc3.3 B45 Vcc3.3 A13 Ground B13 Ground A46 TRDY# B46 DEVSEL# A14 WBF# B14 Reserved A47 STOP# B47 Vddq A15 SBA1 B15 SBA0 A48 PME# B48 PERR# A16 Vcc3.3 B16 Vcc3.3 A49 Ground B49 Ground A17 SBA3 B17 SBA2 A50 PAR B50 SERR# A18 SBSTB# B18 SB_STB A51 AD15 B51 C/BE1# A19 Ground B19 Ground A52 Vddq B52 Vddq A20 SBA5 B20 SBA4 A53 AD13 B53 AD14 A21 SBA7 B21 SBA6 A54 AD11 B54 AD12 A22 Reserved B22 Reserved A55 Ground B55 Ground A23 Ground B23 Ground A56 AD9 B56 AD10 A24 Reserved B24 +3.3 V (aux) A57 C/BE0# B57 AD8 A25 Vcc3.3 B25 Vcc3.3 A58 Vddq B58 Vddq A26 AD30 B26 AD31 A59 AD_STB0# B59 AD_STB0 A27 AD28 B27 AD29 A60 AD6 B60 AD7 A28 Vcc3.3 B28 Vcc3.3 A61 Ground B61 Ground A29 AD26 B29 AD27 A62 AD4 B62 AD5 A30 AD24 B30 AD25 A63 AD2 B63 AD3 A31 Ground B31 Ground A64 Vddq B64 Vddq A32 AD_STB1# B32 AD_STB1 A65 AD0 B65 AD1 A33 C/BE3# B33 AD23 A66 VRREFG_C B66 VREFC_G NOTE ✏ The AGP connector is keyed for 1.5 V AGP cards only. Do not attempt to install a legacy 3.3 V AGP card. The AGP connector is not mechanically compatible with legacy 3.3 V AGP cards. 68 Technical Reference Table 37. Diskette Drive Connector Pin Signal Name Pin Signal Name 1 Ground 2 DENSEL 3 Key 4 Not connected 5 Key 6 DRVDEN1 7 Ground 8 FDINDX# 9 Ground 10 MTR0# (Motor Enable A) 11 Ground 12 Not connected 13 Ground 14 DS0# (Drive Select A) 15 Ground 16 Not connected 17 Not connected 18 DIR# (Stepper Motor Direction) 19 Ground 20 STEP# (Step Pulse) 21 Ground 22 WDATA# (Write Data) 23 Ground 24 WGATE# (Write Enable) 25 Ground 26 TRK0# (Track 0) 27 Not connected 28 WRTPRT# (Write Protect) 29 Ground 30 RDATA# (Read Data) 31 Ground 32 HDSEL# (Side 1 Select) 33 Ground 34 DSKCHG# (Diskette Change) 69 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 38. PCI IDE Connectors Pin Signal Name Pin Signal Name 1 Reset IDE 2 Ground 3 Data 7 4 Data 8 5 Data 6 6 Data 9 7 Data 5 8 Data 10 9 Data 4 10 Data 11 11 Data 3 12 Data 12 13 Data 2 14 Data 13 15 Data 1 16 Data 14 17 Data 0 18 Data 15 19 Ground 20 Key 21 DDRQ0 [DDRQ1] 22 Ground 23 I/O Write# 24 Ground 25 I/O Read# 26 Ground 27 IOCHRDY 28 Ground 29 DDACK0# [DDACK1#] 30 Ground 31 IRQ 14 [IRQ 15] 32 Not connected 33 DAG1 (Address 1) 34 GPIO_DMA66_Detect_Pri (GPIO_DMA66_Detect_Sec) 35 DAG0 (Address 0) 36 DAG2 (Address 2) 37 Chip Select 1P# [Chip Select 1S#] 38 Chip Select 3P# [Chip Select 3S#] 39 Activity# 40 Ground Signal names in brackets ([ ]) are for the secondary IDE connector. Table 39. SCSI LED Connector Pin Signal Name 1 SCSI_ACT# 2 No connect 70 Technical Reference 2.8.3 External I/O Connectors Figure 16 shows the locations of the external I/O connectors. A 1 2 9 10 2 1 710 16 15 1 2 8 9 1 2 1 E D C B OM12992 Item Description For more information see: A Front panel audio Table 40 B Serial port B Table 41 C Auxiliary front panel power/sleep/message-waiting LED Table 43 D Front panel Table 44 E Front panel USB Table 42 Figure 16. External I/O Connectors 71 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 40. Front Panel Audio Connector Pin Signal Name Pin Signal Name 1 MIC_IN_FP 2 Ground 3 MIC_BIAS 4 V_5P0_AUD_ANALOG 5 R_FNTOUT 6 R_RETIN 7 Ground 8 Key 9 L_FNT_OUT 10 L_RETIN NOTE ✏ The front panel audio connector is alternately used as a jumper block for routing audio signals. Refer to Section 2.9.1 on page 75 for more information. Table 41. Serial Port B Connector Pin Signal Name Pin Signal Name 1 DCD (Data Carrier Detect) 2 DSR (Data Set Ready) 3 RXD# (Receive Data) 4 RTS (Request to Send) 5 TXD# (Transmit Data) 6 CTS (Clear to Send) 7 DTR (Data Terminal Ready) 8 RI (Ring Indicator) 9 Ground 10 Not connected Table 42. Front Panel USB Connector Pin Signal Name Pin Signal Name 1 USB_FNT_PWR 2 USB_FNT_PWR 3 USB_FNT1# 4 USB_FNT2# 5 USB_FNT1 6 USB_FNT2 7 Ground 8 Ground 9 Not connected 10 Not connected 2.8.3.1 Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector Pins 1 and 3 of this connector duplicate the signals on pins 2 and 4 of the front panel connector. Table 43. Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector Pin Signal Name In/Out Description 1 HDR_BLNK_GRN Out Front panel green LED 2 Not connected 3 HDR_BLNK_YEL Out Front panel yellow LED 72 Technical Reference 2.8.3.2 Front Panel Connector This section describes the functions of the front panel connector. Table 44 lists the signal names of the front panel connector. Table 44. Front Panel Connector Pin Signal In/Out Description Pin Signal In/Out Description Hard Drive Activity LED Power LED 1 HD_PWR Out Hard disk LED 2 HDR_BLNK_ Out Front panel green pull-up (330 Ω) to +5 GRN LED V 3 HAD# Out Hard disk active LED 4 HDR_BLNK_ Out Front panel yellow YEL LED Reset Switch On/Off Switch 5 Ground Ground 6 FPBUT_IN In Power switch 7 FP_RESET# In Reset switch 8 Ground Ground No Connect Miscellaneous 9 +5 V Out Power 10 N/C Not connected 11 N/C No connect 12 Ground Ground 13 Ground Ground 14 (pin removed) Not connected 15 N/C No connect 16 +5 V Out Power 2.8.3.2.1 Hard Drive Activity LED Connector Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is being read from or written to a hard drive. For the LED to function properly, an IDE drive must be connected to the onboard IDE interface. The LED will also show activity for devices connected to the SCSI hard drive activity LED connector. For information about Refer to The SCSI hard drive activity LED connector Section 1.8.3.2, page 29 2.8.3.2.2 Reset Switch Connector Pins 5 and 7 can be connected to a momentary SPST type switch that is normally open. When the switch is closed, the D845BG/D845PT board resets and runs the POST. 2.8.3.2.3 Power/Sleep/Message Waiting LED Connector Pins 2 and 4 can be connected to a one- or two-color LED. Table 45 shows the possible states for a one-color LED. Table 46 shows the possible states for a two-color LED. Table 45. States for a One-Color Power LED LED State Description Off Power off/sleeping Steady Green Running Blinking Green Running/message waiting 73 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 46. States for a Two-Color Power LED LED State Description Off Power off Steady Green Running Blinking Green Running/message waiting Steady Yellow Sleeping Blinking Yellow Sleeping/message waiting ✏ NOTE To use the message waiting function, ACPI must be enabled in the operating system and a message-capturing application must be invoked. 2.8.3.2.4 Power Switch Connector Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power supply to switch on or off. (The time requirement is due to internal debounce circuitry on the D845BG/D845PT board.) At least two seconds must pass before the power supply will recognize another on/off signal. 74 Technical Reference 2.9 Jumper Blocks CAUTION Do not move any jumpers with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the board could be damaged. Figure 17 shows the location of the jumper blocks on the D845BG and D845PT boards. 1 2 3 4 5 6 A 7 9 10 3 1 B OM12993 Item Description Reference Designator A Front panel audio connector/jumper block J6B1 B BIOS Setup configuration jumper block J6H2 Figure 17. Location of the Jumper Blocks 2.9.1 Front Panel Audio Connector/Jumper Block This connector has two functions: • With jumpers installed, the audio line out signals are routed to the back panel audio line out connector. • With jumpers removed, the connector provides audio line out and mic in signals for front panel audio connectors. Table 47 describes the two configurations of this connector/jumper block. 75 Intel Desktop Board D845BG/D845PT Technical Product Specification CAUTION Do not place jumpers on this block in any configuration other than the one described in Table 47. Other jumper configurations are not supported and could damage the board. Table 47. Front Panel Audio Connector/Jumper Block Jumper Setting Configuration Audio line out signals are routed to the back panel audio line out 1 2 connector. The back panel audio line out connector is shown in Figure 11 34 on page 55. 5 6 5 and 6 7 9 10 9 and 10 Audio line out and mic in signals are available for front panel audio 1 2 No jumpers connectors. Table 40 on page 72 lists the names of the signals available 34 installed on this connector when no jumpers are installed. 5 6 7 9 10 NOTE ✏ When the jumpers are removed and this connector is used for front panel audio, the back panel audio line out and mic in connectors are disabled. 2.9.2 BIOS Setup Configuration Jumper Block The 3-pin jumper block determines the BIOS Setup program’s mode. Table 48 describes the jumper settings for the three modes: normal, configure, and recovery. When the jumper is set to configuration mode and the computer is powered-up, the BIOS compares the processor version and the microcode version in the BIOS and reports if the two match. Table 48. BIOS Setup Configuration Jumper Settings Function/Mode Jumper Setting Configuration Normal The BIOS uses current configuration information and 3 1 1-2 passwords for booting. Configure After the POST runs, Setup runs automatically. The 3 1 2-3 maintenance menu is displayed. Recovery The BIOS attempts to recover the BIOS configuration. A 3 1 None recovery diskette is required. For information about Refer to How to access the BIOS Setup program Section 4.1, page 99 The maintenance menu of the BIOS Setup program Section 4.2, page 100 BIOS recovery Section 3.7, page 95 76 Technical Reference 2.10 Mechanical Considerations 2.10.1 D845BG Form Factor The D845BG board is designed to fit into an ATX-form-factor chassis. Figure 18 illustrates the mechanical form factor for the D845BG board. Dimensions are given in inches [millimeters]. The outer dimensions are 12.00 inches by 8.20 inches [304.80 millimeters by 208.28 millimeters]. Location of the I/O connectors and mounting holes are in compliance with the ATX specification (see Section 1.5). 6.50 [165.10] 6.10 [154.94] 5.20 [132.08] 0.00 1.70 [43.18] 4.90 2.60 6.45 0.00 5.55 [124.96] [66.04] [163.83] 1.80 [140.97] [45.72] 6.20 [157.48] OM13005 Figure 18. D845BG Board Dimensions 77 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.10.2 D845PT Form Factor The D845PT board is designed to fit into either a microATX or an ATX-form-factor chassis. Figure 19 illustrates the mechanical form factor for the D845PT board. Dimensions are given in inches [millimeters]. The outer dimensions are 9.60 inches by 8.20 inches [243.84 millimeters by 208.28 millimeters]. Location of the I/O connectors and mounting holes are in compliance with the ATX specification (see Section 1.5). NOTE ✏ When installing the board in a microATX chassis, make sure that peripheral devices are installed at least 1.5 inches above the main power connector, the diskette drive connector, and the IDE connector, and the DIMM sockets. 6.50 [165.10] 6.10 [154.94] 5.20 [132.08] 0.00 1.70 [43.18] 2.60 0.00 6.45 3.15 [66.04] 1.80 [163.83] [80.01] [45.72] 6.20 [157.48] OM12994 Figure 19. D845PT Board Dimensions 78 Technical Reference 2.10.3 I/O Shield The back panel I/O shield for D845BG and D845PT boards must meet specific dimension and material requirements. Systems based on this board need the back panel I/O shield to pass certification testing. Figures 20-22 show the critical dimensions of the three types of chassis- dependent I/O shields for the boards. Figure 20 shows the I/O shield for boards with the onboard LAN subsystem, but not the USB 2.0 option. Figure 21 shows the I/O shield for boards without the onboard LAN subsystem and the USB 2.0 option. Figure 22 shows the I/O shield for boards without the onboard LAN subsystem, but with the USB 2.0 option. Dimensions are given in inches to a tolerance of ±0.02 inches. The figures also indicate the position of each cutout. Additional design considerations for I/O shields relative to chassis requirements are described in the ATX specification. See Section 1.5 for information about the ATX specification. NOTE ✏ The I/O shield drawings in this document are for reference only. An I/O shield compliant with the ATX chassis specification 2.01 is available from Intel. 6.390 Ref [162.300] 0.063±0.005 [1.600±0.120] 0.787±0.010 TYP [20±0.254] 3x Dia 0.330 [8.380] 0.039 Dia. [1.000] 8X R0.5 MIN 0.884 [22.450] 0.519 [13.190] 0.276 0.027 [7.012] [0.690] 1.89 0.00 Ref 0.465 [11.811] 0.465 [11.811] 0.567 [14.400] 0.567 [14.400] 0.621 [15.770] Pictorial View OM12352 Figure 20. I/O Shield Dimensions (for boards with the LAN Subsystem, but not USB 2.0) 79 0.00 0.447 [11.345] 1.195 [30.360] 1.807 [45.892] 2.079 [52.804] 5.010 [127.250] 5.732 [145.584] Intel Desktop Board D845BG/D845PT Technical Product Specification 6.390 Ref [162.300] 0.063±0.005 [1.600±0.120] 0.787±0.010 TYP [20±0.254] 3x Dia 0.330 [8.380] 0.039 Dia. [1.000] 8X R0.5 MIN 0.884 [22.450] 0.519 [13.190] 0.276 0.027 [7.012] [0.690] 1.89 0.00 Ref 0.465 [11.811] 0.465 [11.811] 0.567 [14.400] 0.567 [14.400] 0.621 [15.770] Pictorial View OM12868 Figure 21. I/O Shield Dimensions (for boards with neither the LAN Subsystem nor USB 2.0) 80 0.00 0.447 [11.345] 1.195 [30.360] 1.807 [45.892] 2.079 [52.804] 5.010 [127.250] 5.732 [145.584] Technical Reference 6.390 Ref [162.300] 0.063±0.005 [1.600±0.120] 0.787±0.010 TYP [20±0.254] 3x Dia 0.330 [8.380] 0.039 Dia. [1.000] 8X R0.5 MIN 0.884 [22.450] 0.519 [13.190] 0.276 0.027 [7.012] [0.690] 1.89 0.00 Ref 0.465 [11.811] 0.465 [11.811] 0.567 [14.400] 0.621 [15.770] Pictorial View OM12867 Figure 22. I/O Shield Dimensions (for boards without the LAN Subsystem, but with USB 2.0) 81 0.00 0.447 [11.345] 1.807 [45.892] 2.079 [52.804] 5.010 [127.250] 5.732 [145.584] Intel Desktop Board D845BG/D845PT Technical Product Specification 2.11 Electrical Considerations 2.11.1 Power Consumption Table 49 lists voltage and current measurements for a computer that contains the D845BG/D845PT board and the following: • 2.2 GHz Intel Pentium 4 processor with a 256 KB cache • 32 MB AGP card • 512 MB DDR SDRAM • 3.5-inch diskette drive • 10.2 GB IDE hard disk drive • 52 X IDE CD-ROM drive This information is provided only as a guide for calculating approximate power usage with additional resources added. Values for the Windows XP desktop mode are measured at 1024 x 768 x true color (32 bit) and 85 Hz refresh rate. AC watts are measured with the computer is connected to a typical 300 W power supply, at nominal input voltage and frequency, with a true RMS wattmeter at the line input. ✏ NOTE Actual system power consumption depends upon system configuration. The power supply should comply with the recommendations found in the ATX/ATX12V Power Supply Design Guide, Version 1.1 (see Section 1.5 on page 19 for specification information). Table 49. Power Usage DC Current at: Mode AC Power +3.3 V +5 V +12 V -12 V +5 VSB ACPI S0 56.1 W 4.210 A 0.175 A 1.234 A 0.75 A 0.316 A ACPI S1 44.9 W 2.604 A 0.128 A 1.230 A 0.75 A 0.260 A ACPI S3 3.9 W 0.004 A 0.003 A 0.003 A 0.004 A 0.411 A 2.11.2 Add-in Board Considerations The D845BG and D845PT boards are designed to provide 2 A (average) of +5 V current for each add-in board. The total +5 V current draw for add-in boards is as follows: • For a fully loaded D845BG board (all seven expansion slots filled), the total +5 V current draw must not exceed 14 A. • For a fully loaded D845PT board (all four expansion slots filled), the total +5 V current draw must not exceed 8 A. 82 Technical Reference 2.11.3 Standby Current Requirements CAUTION If the standby current necessary to support multiple wake events from the PCI and/or USB buses exceeds power supply capacity, the D845BG and D845PT boards may lose register settings stored in memory, etc. Calculate the standby current requirements using the steps described below. Power supplies used with the D845BG and D845PT boards must be able to provide enough standby current to support the Instantly Available PC (ACPI S3 sleep state) configuration as outlined in Table 50 below. Values are determined by specifications such as PCI 2.2. Actual measured values may vary. To estimate the amount of standby current required for a particular system configuration, standby current requirements of all installed components must be added to determine the total standby current requirement. Refer to the descriptions in Table 50 and review the following steps. 1. Note the total D845BG or D845PT board standby current requirement. 2. Add to that the total PS/2 port standby current requirement if a wake-enabled device is connected. 3. Add, from the PCI 2.2 slots (wake enabled) row, the total number of wake-enabled devices installed (PCI and AGP) and multiply by the standby current requirement. 4. Add, from the PCI 2.2 slots (nonwake enabled) row, the total number of wake-enabled devices installed (PCI and AGP) and multiply by the standby current requirement. 5. Add all additional wake-enabled devices’ and nonwake-enabled devices’ standby current requirements as applicable. 6. Add all the required current totals from steps 1 through 5 to determine the total estimated standby current power supply requirement. Table 50. Standby Current Requirements Instantly Available PC Current Standby Current Support (Estimated for Description Requirements (mA) Integrated Board Components) Total for D845BG board 395 (Note) PS/2 ports 345 Instantly Available PC Stand-by Current Support PCI 2.2 slots (wake enabled) 375 • Estimated for add-on PCI 2.2 slots (nonwake enabled) 20 components (Note) CNR 375 • Add to Instantly Available (Note) USB ports 500 PC total current requirement (See instructions above) Note: Dependent upon system configuration 83 Intel Desktop Board D845BG/D845PT Technical Product Specification NOTE ✏ IBM PS/2 Port Specification (Sept 1991) states: • 275 mA for keyboard • 70 mA for the mouse (nonwake-enable device) PCI/AGP requirements are calculated by totaling the following: • One wake-enabled device @ 375 mA, plus • Five nonwake-enabled devices @ 20 mA each, plus USB requirements are calculated as: • One wake-enabled device @ 500 mA • USB hub @ 100 mA • Three USB nonwake-enabled devices connected @ 2.5 mA each NOTE ✏ Both USB ports are capable of providing up to 500 mA during normal G0/S0 operation. Only one USB port will support up to 500 mA of stand-by-current (wake-enabled device) during G1/S3 suspended operation. The other port may provide up to 7.5 mA (three nonwake-enabled devices.) during G1/S3 suspended operation. 2.11.4 Fan Connector Current Capability Table 51 lists the current capability of the fan connectors on the D845BG and D845PT boards. Table 51. Fan Connector Current Capability Fan Connector Maximum Available Current Processor fan 1.00 A Front chassis fan 0.50 A Rear chassis fan 0.35 A 2.11.5 Power Supply Considerations CAUTION The +5 V standby line for the power supply must be capable of providing adequate +5 V standby current. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options. Refer to Section 2.11.3 on page 82 for additional information. System integrators should refer to the power usage values listed in Table 49 when selecting a power supply for use with the D845BG or D845PT boards. Measurements account only for current sourced by the D845BG or D845PT boards while running in idle modes of the started operating systems. Additional power required will depend on configurations chosen by the integrator. 84 Technical Reference The power supply must comply with the following recommendations found in the indicated sections of the ATX form factor specification. • The potential relation between 3.3 VDC and +5 VDC power rails (Section 4.2) • The current capability of the +5 VSB line (Section 4.2.1.2) • All timing parameters (Section 4.2.1.3) • All voltage tolerances (Section 4.2.2) For information about Refer to Section 1.5, page 19 The ATX form factor specification 2.12 Thermal Considerations CAUTION Ensure that the ambient temperature does not exceed the board’s maximum operating temperature. Failure to do so could cause components to exceed their maximum case temperature and malfunction. For information about the maximum operating temperature, see the environmental specifications in Section 2.14. CAUTION Ensure that proper airflow is maintained in the processor voltage regulator circuit. Failure to do so may result in damage to the voltage regulator circuit. The processor voltage regulator area o (item A in Figure 23) can reach a temperature of up to 85 C in an open chassis. 85 Intel Desktop Board D845BG/D845PT Technical Product Specification Figure 23 shows the locations of the localized high temperature zones. A B C D OM12995 A Processor voltage regulator area B Processor C Intel 82845 MCH D Intel 82801BA ICH2 Figure 23. Localized High Temperature Zones Table 52 provides maximum case temperatures for D845BG/D845PT board components that are sensitive to thermal changes. The operating temperature, current load, or operating frequency could affect case temperatures. Maximum case temperatures are important when considering proper airflow to cool the D845BG/D845PT boards. Table 52. Thermal Considerations for Components Component Maximum Case Temperature Intel Pentium 4 processor For processor case temperature, see processor datasheets and processor specification updates o Intel 82845 MCH 83 C (under bias) o Intel 82801BA ICH2 109 C (under bias) For information about Refer to Intel Pentium 4 processor datasheets and specification updates Section 1.3, page 18 86 Technical Reference 2.13 Reliability The Mean Time Between Failures (MTBF) prediction is calculated using component and subassembly random failure rates. The calculation is based on the Bellcore Reliability Prediction Procedure, TR-NWT-000332, Issue 4, September 1991. The MTBF prediction is used to estimate repair rates and spare parts requirements. The MTBF data is calculated from predicted data at 55 ºC. The MTBF calculations for the boards are as follows: • D845BG board MTBF: 140818.2951 hours • D845PT board MTBF: 143991.3836 hours 2.14 Environmental Table 53 lists the environmental specifications for the D845BG and D845PT boards. Table 53. D845BG/D845PT Board Environmental Specifications Parameter Specification Temperature Non-Operating -40 °C to +70 °C Operating 0 °C to +55 °C Shock Unpackaged 50 g trapezoidal waveform Velocity change of 170 inches/second Packaged Half sine 2 millisecond Product Weight (pounds) Free Fall (inches) Velocity Change (inches/sec) <20 36 167 21-40 30 152 41-80 24 136 81-100 18 118 Vibration Unpackaged 5 Hz to 20 Hz: 0.01 g² Hz sloping up to 0.02 g² Hz 20 Hz to 500 Hz: 0.02 g² Hz (flat) Packaged 10 Hz to 40 Hz: 0.015 g² Hz (flat) 40 Hz to 500 Hz: 0.015 g² Hz sloping down to 0.00015 g² Hz 87 Intel Desktop Board D845BG/D845PT Technical Product Specification 2.15 Regulatory Compliance This section describes the D845BG and D845PT boards’ compliance with U.S. and international safety and electromagnetic compatibility (EMC) regulations. 2.15.1 Safety Regulations Table 54 lists the safety regulations the D845BG and D845PT boards comply with when correctly installed in a compatible host system. Table 54. Safety Regulations Regulation Title CSA C22.2 No. 60950/ Bi-National Standard for Safety of Information Technology Equipment rd UL 60950, 3 Edition, 2000 including Electrical Business Equipment. (USA and Canada) nd EN 60950, 2 Edition, 1992 The Standard for Safety of Information Technology Equipment including (with Amendments 1, 2, 3, and 4) Electrical Business Equipment. (European Union) nd IEC 60950, 2 Edition, 1991 The Standard for Safety of Information Technology Equipment including (with Amendments 1, 2, 3, and 4) Electrical Business Equipment. (International) EMKO-TSE (74-SEC) 207/94 Summary of Nordic deviations to EN 60950. (Norway, Sweden, Denmark, and Finland) 2.15.2 EMC Regulations Table 55 lists the EMC regulations the D845BG and D845PT boards comply with when correctly installed in a compatible host system. Table 55. EMC Regulations Regulation Title FCC (Class B) Title 47 of the Code of Federal Regulations, Parts 2 and 15, Subpart B, Radio Frequency devices. (USA) ICES-003 (Class B) Interference-Causing Equipment Standard, Digital Apparatus. (Canada) EN55022: 1998 (Class B) Limits and methods of measurement of Radio Interference Characteristics of Information Technology Equipment. (European Union) EN55024: 1998 Information Technology Equipment – Immunity Characteristics Limits and methods of measurement. (European Union) AS/NZS 3548 (Class B) Australian Communications Authority, Standard for Electromagnetic Compatibility. (Australia and New Zealand) rd CISPR 22, 3 Edition (Class B) Limits and methods of measurement of Radio Disturbance Characteristics of Information Technology Equipment. (International) CISPR 24: 1997 Information Technology Equipment – Immunity Characteristics – Limits and Methods of Measurements. (International) 88 Technical Reference 2.15.3 Product Certification Markings (Board Level) The D845BG and D845PT boards have the following product certification markings: • UL joint US/Canada Recognized Component mark: Consists of lower case c followed by a stylized backward UR and followed by a small US. Includes adjacent UL file number for Intel desktop boards: E210882 (component side). • FCC Declaration of Conformity logo mark for Class B equipment; to include Intel name and D845BG and D845PT model designation (solder side). • CE mark: Declaring compliance to European Union (EU) EMC directive (89/336/EEC) and Low Voltage directive (73/23/EEC) (component side). The CE mark should also be on the shipping container. • Australian Communications Authority (ACA) C-Tick mark: consists of a stylized C overlaid with a check (tick) mark (component side), followed by Intel supplier code number, N-232. The C-tick mark should also be on the shipping container. • Korean EMC certification logo mark: consists of MIC lettering within a stylized elliptical outline. • Printed wiring board manufacturer’s recognition mark: consists of a unique UL recognized manufacturer’s logo, along with a flammability rating (94V-0) (solder side). • PB part number: Intel bare circuit board part number (solder side). Also includes SKU number starting with AA followed by additional alphanumeric characters.  For the D845BG board, the PB number A66960-003.  For the D845PT board, the PB number is A67346-003. • Battery “+ Side Up” marking: located on the component side of the board in close proximity to the battery holder. 89 Intel Desktop Board D845BG/D845PT Technical Product Specification 90 3 Overview of BIOS Features What This Chapter Contains 3.1 Introduction.................................................................................................................91 3.2 BIOS Flash Memory Organization ..............................................................................92 3.3 Resource Configuration..............................................................................................92 3.4 System Management BIOS (SMBIOS).......................................................................93 3.5 Legacy USB Support ..................................................................................................93 3.6 BIOS Updates ............................................................................................................94 3.7 Recovering BIOS Data ...............................................................................................95 3.8 Boot Options...............................................................................................................96 ® 3.9 Fast Booting Systems with Intel Rapid BIOS Boot....................................................96 3.10 BIOS Security Features..............................................................................................98 3.1 Introduction The D845BG and D845PT boards use an Intel/AMI BIOS that is stored in the Firmware Hub (FWH) and can be updated using a disk-based program. The FWH contains the BIOS Setup program, POST, the PCI auto-configuration utility, and Plug and Play support. The D845BG and D845PT boards support system BIOS shadowing, allowing the BIOS to execute from 64-bit onboard write-protected system memory. The BIOS displays a message during POST identifying the type of BIOS and a revision code. The initial production BIOSs are identified as PT84510A.86A. When the D845BG or D845PT board’s jumper is set to configuration mode and the computer is powered-up, the BIOS compares the CPU version and the microcode version in the BIOS and reports if the two match. For information about Refer to The D845BG and D845PT boards’ compliance level with Plug and Play Section 1.5, page 19 91 Intel Desktop Board D845BG/D845PT Technical Product Specification 3.2 BIOS Flash Memory Organization The Intel 82802AB Firmware Hub (FWH) includes a 4 Mbit (512 KB) symmetrical flash memory device. Internally, the device is grouped into eight 64-KB blocks that are individually erasable, lockable, and unlockable. 3.3 Resource Configuration 3.3.1 PCI Autoconfiguration The BIOS can automatically configure PCI devices. PCI devices may be onboard or add-in cards. Autoconfiguration lets a user insert or remove PCI cards without having to configure the system. When a user turns on the system after adding a PCI card, the BIOS automatically configures interrupts, the I/O space, and other system resources. Any interrupts set to Available in Setup are considered to be available for use by the add-in card. Autoconfiguration information is stored in ESCD format. For information about the versions of PCI and Plug and Play supported by the BIOS, see Section 1.5. 3.3.2 PCI IDE Support If you select Auto in the BIOS Setup program, the BIOS automatically sets up the two PCI IDE connectors with independent I/O channel support. The IDE interface supports hard drives up to ATA-66/100 and recognizes any ATAPI compliant devices, including CD-ROM drives, tape drives, and Ultra DMA drives (see Section 1.5 for the supported version of ATAPI). The BIOS determines the capabilities of each drive and configures them to optimize capacity and performance. To take advantage of the high capacities typically available today, hard drives are automatically configured for Logical Block Addressing (LBA) and to PIO Mode 3 or 4, depending on the capability of the drive. You can override the auto-configuration options by specifying manual configuration in the BIOS Setup program. To use ATA-66/100 features the following items are required: • An ATA-66/100 peripheral device • An ATA-66/100 compatible cable • ATA-66/100 operating system device drivers NOTE ✏ ATA-66/100 compatible cables are backward compatible with drives using slower IDE transfer protocols. If an ATA-66/100 disk drive and a disk drive using any other IDE transfer protocol are attached to the same cable, the maximum transfer rate between the drives is reduced to that of the slowest device. NOTE ✏ Do not connect an ATA device as a slave on the same IDE cable as an ATAPI master device. For example, do not connect an ATA hard drive as a slave to an ATAPI CD-ROM drive. 92 Overview of BIOS Features 3.4 System Management BIOS (SMBIOS) SMBIOS is a Desktop Management Interface (DMI) compliant method for managing computers in a managed network. The main component of SMBIOS is the Management Information Format (MIF) database, which contains information about the computing system and its components. Using SMBIOS, a system administrator can obtain the system types, capabilities, operational status, and installation dates for system components. The MIF database defines the data and provides the method for accessing this information. The BIOS enables applications such as third-party management software to use SMBIOS. The BIOS stores and reports the following SMBIOS information: • BIOS data, such as the BIOS revision level • Fixed-system data, such as peripherals, serial numbers, and asset tags • Resource data, such as memory size, cache size, and processor speed • Dynamic data, such as event detection and error logging Non-Plug and Play operating systems, such as Windows NT, require an additional interface for obtaining the SMBIOS information. The BIOS supports an SMBIOS table interface for such operating systems. Using this support, an SMBIOS service-level application running on a non-Plug and Play operating system can obtain the SMBIOS information. For information about Refer to The D845BG and D845PT boards’ compliance level with SMBIOS Section 1.5, page 19 3.5 Legacy USB Support Legacy USB support enables USB devices such as keyboards, mice, and hubs to be used even when the operating system’s USB drivers are not yet available. Legacy USB support is used to access the BIOS Setup program, and to install an operating system that supports USB. By default, Legacy USB support is set to Enabled. Legacy USB support operates as follows: 1. When you apply power to the computer, legacy support is disabled. 2. POST begins. 3. Legacy USB support is enabled by the BIOS allowing you to use a USB keyboard to enter and configure the BIOS Setup program and the maintenance menu. 4. POST completes. 93 Intel Desktop Board D845BG/D845PT Technical Product Specification 5. The operating system loads. While the operating system is loading, USB keyboards and mice are recognized and may be used to configure the operating system. (Keyboards and mice are not recognized during this period if Legacy USB support was set to Disabled in the BIOS Setup program.) 6. After the operating system loads the USB drivers, all legacy and non-legacy USB devices are recognized by the operating system, and Legacy USB support from the BIOS is no longer used. To install an operating system that supports USB, verify that Legacy USB support in the BIOS Setup program is set to Enabled and follow the operating system’s installation instructions. NOTE ✏ Legacy USB support is for keyboards, mice, and hubs only. Other USB devices are not supported in legacy mode. 3.6 BIOS Updates The BIOS can be updated using either of the following utilities, which are available on the Intel World Wide Web site: ® • Intel Express BIOS Update utility, which enables automated updating while in the Windows environment. Using this utility, the BIOS can be updated from a file on a hard disk, a 1.44 MB diskette, or a CD-ROM, or from the file location on the Web. ® • Intel Flash Memory Update Utility, which requires creation of a boot diskette and manual rebooting of the system. Using this utility, the BIOS can be updated from a file on a 1.44 MB diskette (from a legacy diskette drive or an LS-120 diskette drive) or a CD-ROM. Both utilities support the following BIOS maintenance functions: • Verifying that the updated BIOS matches the target system to prevent accidentally installing an incompatible BIOS. • Updating both the BIOS boot block and the main BIOS. This process is fault tolerant to prevent boot block corruption. • Updating the BIOS boot block separately. • Changing the language section of the BIOS. • Updating replaceable BIOS modules, such as the video BIOS module. • Inserting a custom splash screen. NOTE ✏ Review the instructions distributed with the upgrade utility before attempting a BIOS update. For information about Refer to The Intel World Wide Web site Section 1.3, page 18 94 Overview of BIOS Features 3.6.1 Language Support The BIOS Setup program and help messages are supported in five languages: US English, German, Italian, French, and Spanish. The default language is US English, which is present unless another language is selected in the BIOS Setup program. 3.6.2 Custom Splash Screen During POST, an Intel splash screen is displayed by default. This splash screen can be replaced with a custom splash screen. A utility is available from Intel to assist with creating a custom splash screen. The custom splash screen can be programmed into the flash memory using the BIOS upgrade utility. Information about this capability is available on the Intel Support World Wide Web site. For information about Refer to The Intel World Wide Web site Section 1.3, page 18 3.7 Recovering BIOS Data Some types of failure can destroy the BIOS. For example, the data can be lost if a power outage occurs while the BIOS is being updated in flash memory. The BIOS can be recovered from a diskette using the BIOS recovery mode. When recovering the BIOS, be aware of the following: • Because of the small amount of code available in the non-erasable boot block area, there is no video support. You can only monitor this procedure by listening to the speaker or looking at the diskette drive LED. • The recovery process may take several minutes; larger BIOS flash memory devices require more time. • Two beeps and the end of activity in the diskette drive indicate successful BIOS recovery. • A series of continuous beeps indicates a failed BIOS recovery. To create a BIOS recovery diskette, a bootable diskette must be created and the BIOS update files copied to it. BIOS upgrades and the Intel Flash Memory Update Utility are available from Intel Customer Support through the Intel World Wide Web site. NOTE ✏ Even if the computer is configured to boot from an LS-120 diskette (in the Setup program’s Removable Devices submenu), the BIOS recovery diskette must be a standard 1.44 MB diskette not a 120 MB diskette. For information about Refer to The BIOS recovery mode jumper settings Section 2.9.1, page 75 The Boot menu in the BIOS Setup program Section 4.7, page 117 Contacting Intel customer support Section 1.3, page 18 95 Intel Desktop Board D845BG/D845PT Technical Product Specification 3.8 Boot Options In the BIOS Setup program, the user can choose to boot from a diskette drive, hard drives, CD-ROM, or the network. The default setting is for the diskette drive to be the first boot device, the hard drive second, and the ATAPI CD-ROM third. The fourth device is disabled. 3.8.1 CD-ROM and Network Boot Booting from CD-ROM is supported in compliance to the El Torito bootable CD-ROM format specification. Under the Boot menu in the BIOS Setup program, ATAPI CD-ROM is listed as a boot device. Boot devices are defined in priority order. Accordingly, if there is not a bootable CD in the CD-ROM drive, the system will attempt to boot from the next defined drive. The network can be selected as a boot device. This selection allows booting from the onboard LAN or a network add-in card with a remote boot ROM installed. For information about Refer to The El Torito specification Section 1.5, page 19 3.8.2 Booting Without Attached Devices For use in embedded applications, the BIOS has been designed so that after passing the POST, the operating system loader is invoked even if the following devices are not present: • Video adapter • Keyboard • Mouse ® 3.9 Fast Booting Systems with Intel Rapid BIOS Boot These factors affect system boot speed: • Selecting and configuring peripherals properly • Using an optimized BIOS, such as the Intel Rapid BIOS 3.9.1 Peripheral Selection and Configuration The following techniques help improve system boot speed: • Choose a hard drive with parameters such as “power-up to data ready” less than eight seconds, that minimize hard drive startup delays. • Select a CD-ROM drive with a fast initialization rate. This rate can influence POST execution time. • Eliminate unnecessary add-in adapter features, such as logo displays, screen repaints, or mode changes in POST. These features may add time to the boot process. • Try different monitors. Some monitors initialize and communicate with the BIOS more quickly, which enables the system to boot more quickly. 96 Overview of BIOS Features 3.9.2 Intel Rapid BIOS Boot Use of the following BIOS Setup program settings reduces the POST execution time. In the Boot Menu: • Set the hard disk drive as the first boot device. As a result, the POST does not first seek a diskette drive, which saves about one second from the POST execution time. • Disable Quiet Boot, which eliminates display of the logo splash screen. This could save several seconds of painting complex graphic images and changing video modes. • Enabled Intel Rapid BIOS Boot. This feature bypasses memory count and the search for a diskette drive. In the Peripheral Configuration submenu, disable the LAN device if it will not be used. This can reduce up to four seconds of option ROM boot time. NOTE ✏ It is possible to optimize the boot process to the point where the system boots so quickly that the Intel logo screen (or a custom logo splash screen) will not be seen. Monitors and hard disk drives with minimum initialization times can also contribute to a boot time that might be so fast that necessary logo screens and POST messages cannot be seen. This boot time may be so fast that some drives might be not be initialized at all. If this condition should occur, it is possible to introduce a programmable delay ranging from three to 30 seconds (using the Hard Disk Pre-Delay feature of the Advanced Menu in the IDE Configuration Submenu of the BIOS Setup program). For information about Refer to IDE Configuration Submenu in the BIOS Setup program Section 4.4.4, page 108 97 Intel Desktop Board D845BG/D845PT Technical Product Specification 3.10 BIOS Security Features The BIOS includes security features that restrict access to the BIOS Setup program and who can boot the computer. A supervisor password and a user password can be set for the BIOS Setup program and for booting the computer, with the following restrictions: • The supervisor password gives unrestricted access to view and change all the Setup options in the BIOS Setup program. This is the supervisor mode. • The user password gives restricted access to view and change Setup options in the BIOS Setup program. This is the user mode. • If only the supervisor password is set, pressing the key at the password prompt of the BIOS Setup program allows the user restricted access to Setup. • If both the supervisor and user passwords are set, users can enter either the supervisor password or the user password to access Setup. Users have access to Setup respective to which password is entered. • Setting the user password restricts who can boot the computer. The password prompt will be displayed before the computer is booted. If only the supervisor password is set, the computer boots without asking for a password. If both passwords are set, the user can enter either password to boot the computer. Table 56 shows the effects of setting the supervisor password and user password. This table is for reference only and is not displayed on the screen. Table 56. Supervisor and User Password Functions Supervisor Password to Password Password Set Mode User Mode Setup Options Enter Setup During Boot Neither Can change all Can change all None None None (Note) (Note) options options Supervisor Can change all Can change a Supervisor Password Supervisor None only options limited number of options User only N/A Can change all Enter Password User User options Clear User Password Supervisor Can change all Can change a Supervisor Password Supervisor or Supervisor or and user set options limited number Enter Password user user of options Note: If no password is set, any user can change all Setup options. For information about Refer to Setting user and supervisor passwords Section 4.5, page 114 98 4 BIOS Setup Program What This Chapter Contains 4.1 Introduction.................................................................................................................99 4.2 Maintenance Menu...................................................................................................100 4.3 Main Menu................................................................................................................102 4.4 Advanced Menu........................................................................................................103 4.5 Security Menu ..........................................................................................................114 4.6 Power Menu .............................................................................................................115 4.7 Boot Menu................................................................................................................117 4.8 Exit Menu .................................................................................................................120 4.1 Introduction The BIOS Setup program can be used to view and change the BIOS settings for the computer. The BIOS Setup program is accessed by pressing the key after the Power-On Self-Test (POST) memory test begins and before the operating system boot begins. The menu bar is shown below. Maintenance Main Advanced Security Power Boot Exit Table 57 lists the BIOS Setup program menu features. Table 57. BIOS Setup Program Menu Bar Maintenance Main Advanced Security Power Boot Exit Clears Allocates Configures Sets Configures Selects boot Saves or passwords and resources for advanced passwords power options and discards BIS credentials hardware features and security management power supply changes to and enables components available features features controls Setup extended through the program configuration chipset options mode For information about Refer to Boot Integrity Services (BIS) Section 1.5, page 19 NOTE ✏ In this chapter, all examples of the BIOS Setup program menu bar include the maintenance menu; however, the maintenance menu is displayed only when the board is in configuration mode. Section 2.9 on page 75 tells how to put the board in configuration mode. 99 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 58 lists the function keys available for menu screens. Table 58. BIOS Setup Program Function Keys BIOS Setup Program Function Key Description <←> or <→> Selects a different menu screen (Moves the cursor left or right) <↑> or <↓> Selects an item (Moves the cursor up or down) Selects a field (Not implemented) Executes command or selects the submenu Load the default configuration values for the current menu Save the current values and exits the BIOS Setup program Exits the menu 4.2 Maintenance Menu To access this menu, select Maintenance on the menu bar at the top of the screen. Main Advanced Security Power Boot Exit Maintenance Extended Configuration The menu shown in Table 59 is for clearing Setup passwords and enabling extended configuration mode. Setup only displays this menu in configuration mode. See Section 2.9 on page 75 for configuration mode setting information. Table 59. Maintenance Menu Feature Options Description Clear All Passwords • Yes (default) Clears the user and supervisor passwords. • No Clear BIS Credentials • Yes (default) Clears the Wired for Management Boot Integrity Service (BIS) credentials. • No Extended • Default (default) Invokes the Extended Configuration submenu. Configuration • User-Defined CPU Information No options Displays CPU Information. CPU Stepping No options Displays CPU’s Stepping Signature. Signature CPU Microcode No options Displays CPU’s Microcode Update Revision. Update Revision 100 BIOS Setup Program 4.2.1 Extended Configuration Submenu To access this submenu, select Maintenance on the menu bar and then Extended Configuration. Main Advanced Security Power Boot Exit Maintenance Extended Configuration The submenu represented by Table 60 is for setting video memory cache mode. This submenu becomes available when User Defined is selected under Extended Configuration. Table 60. Extended Configuration Submenu Feature Options Description Extended Configuration • Default User Defined allows setting memory control and video (default) memory cache mode. If selected here, will also display in the Advanced Menu as: “Extended Menu: Used.” • User Defined Video Memory Cache Mode • USWC Selects Uncacheable Speculative Write-Combining (USWC) video memory cache mode. Full 32 byte contents of the Write Combining buffer are written to memory as required. Cache lookups are not performed. Both the video driver and the application must support Write Combining. • UC (default) Selects UnCacheable (UC) video memory cache mode. This setting identifies the video memory range as uncacheable by the processor. Memory writes are performed in program order. Cache lookups are not performed. Well suited for applications not supporting Write Combining. 101 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.3 Main Menu To access this menu, select Main on the menu bar at the top of the screen. Maintenance Advanced Security Power Boot Exit Main Table 61 describes the Main menu. This menu reports processor and memory information and is for configuring the system date and system time. Table 61. Main Menu Feature Options Description BIOS Version No options Displays the version of the BIOS. Processor Type No options Displays processor type. Processor Speed No options Displays processor speed. System Bus Speed No options Displays the system bus speed. Cache RAM No options Displays the size of second-level cache and whether it is ECC-capable. Total Memory No options Displays the total amount of RAM. Memory Bank 0 No options Displays the amount and type of RAM in the memory banks. Memory Bank 1 Language • English (default) Selects the current default language used by the BIOS. • Español • Deutsch • Italiano • Français Memory • Non-ECC Allows the user to enable error reporting if the system and Configuration all installed memory support ECC. If non-ECC memory is • ECC (default) installed, BIOS will detect and change the setting to Non-ECC. System Time Hour, minute, and Specifies the current time. second System Date Day of week Specifies the current date. Month/day/year 102 BIOS Setup Program 4.4 Advanced Menu To access this menu, select Advanced on the menu bar at the top of the screen. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration Table 62 describes the Advanced Menu. This menu is used for setting advanced features that are available through the chipset. Table 62. Advanced Menu Feature Options Description Extended Configuration No options If Used is displayed, User-Defined has been selected in Extended Configuration under the Maintenance Menu. PCI Configuration Select to display Configures individual PCI slot’s IRQ priority. submenu Boot Configuration Select to display Configures Plug and Play and the Numlock key, and resets submenu configuration data. Peripheral Configuration Select to display Configures peripheral ports and devices. submenu IDE Configuration Select to display Specifies type of connected IDE devices. submenu Diskette Configuration Select to display Configures the diskette drive. submenu Event Log Configuration Select to display Configures event logging. submenu Video Configuration Select to display Configures video features. submenu 103 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.4.1 PCI Configuration Submenu To access this submenu, select Advanced on the menu bar and then PCI Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The submenu shown in Table 63 is used to configure the IRQ priority of PCI slots individually. Table 63. PCI Configuration Submenu Feature Options Description PCI Slot1 IRQ Priority • Auto (default) Allows selection of IRQ priority for PCI bus connector 1. (Note 1) • 9 • 10 • 11 PCI Slot2 IRQ Priority • Auto (default) Allows selection of IRQ priority for PCI bus connector 2. (Note 1) • 9 • 10 • 11 PCI Slot3 IRQ Priority • Auto (default) Allows selection of IRQ priority for PCI bus connector 3. (Note 1) • 9 • 10 • 11 PCI Slot4 IRQ Priority • Auto (default) Allows selection of IRQ priority for PCI bus connector 4. (Note 1 and Note 2) • 9 • 10 • 11 PCI Slot5 IRQ Priority No options Displays the IRQ for PCI bus connector 5. This IRQ will (Note 1 and Note 2) be the same as the setting selected for PCI bus connector 1. (PCI bus connectors 1 and 5 share the same interrupt.) PCI Slot6 IRQ Priority No options Displays the IRQ for PCI bus connector 6. This IRQ will (Note 1 and Note 2) be the same as the setting selected for PCI bus connector 4. (PCI bus connectors 4 and 6 share the same interrupt.) Notes: 1. Additional interrupts may be available if certain onboard devices (such as the serial and parallel ports) are disabled. 2. This option appears only on the D845BG board. 104 BIOS Setup Program 4.4.2 Boot Configuration Submenu To access this submenu, select Advanced on the menu bar and then Boot Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The submenu represented by Table 64 is for setting Plug and Play options, resetting configuration data, and the power-on state of the Numlock key. Table 64. Boot Configuration Submenu Feature Options Description Plug & Play O/S • No (default) Specifies if manual configuration is desired. No lets the BIOS configure all devices. This setting is • Yes appropriate when using a Plug and Play operating system. Yes lets the operating system configure Plug and Play devices not required to boot the system. This option is available for use during lab testing. Reset Config Data • No (default) No does not clear the PCI/PnP configuration data stored in flash memory on the next boot. • Yes Yes clears the PCI/PnP configuration data stored in flash memory on the next boot. Numlock • Off Specifies the power-on state of the Numlock feature on the numeric keypad of the keyboard. • On (default) 105 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.4.3 Peripheral Configuration Submenu To access this submenu, select Advanced on the menu bar and then Peripheral Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The submenu represented in Table 65 is used for configuring computer peripherals. Table 65. Peripheral Configuration Submenu Feature Options Description Serial Port A • Disabled Configures serial port A. • Enabled Auto assigns the first free COM port, normally COM1, the address 3F8h, and the interrupt IRQ4. • Auto (default) An * (asterisk) displayed next to an address indicates a conflict with another device. Base I/O address • 3F8 (default) Specifies the base I/O address for serial port A. (This feature is present • 2F8 only when Serial Port A • 3E8 is set to Enabled) • 2E8 Interrupt • IRQ 3 Specifies the interrupt for serial port A. (This feature is present • IRQ 4 only when Serial Port A (default) is set to Enabled) Serial Port B • Disabled Configures serial port B. • Enabled Auto assigns the first free COM port, normally COM 2, the address 3F8h, and the interrupt IRQ4. • Auto (default) An * (asterisk) displayed next to an address indicates a conflict with another device. Base I/O address • 2F8 (default) Specifies the base I/O address for serial port B. (This feature is displayed • 3E8 only if Serial Port B is set • 2E8 to Enabled) continued 106 BIOS Setup Program Table 65. Peripheral Configuration Submenu (continued) Feature Options Description Interrupt • IRQ 3 Specifies the interrupt for serial port B. (This feature is displayed (default) only if Serial Port B is set • IRQ 4 to Enabled) Parallel port • Disabled Configures the parallel port. • Enabled Auto assigns LPT1 the address 378h and the interrupt IRQ7. • Auto (default) An * (asterisk) displayed next to an address indicates a conflict with another device. Mode • Output Only Selects the mode for the parallel port. Not available if the parallel port is disabled. • Bi-directional † (default) Output Only operates in AT -compatible mode. • EPP Bi-directional operates in PS/2-compatible mode. • ECP EPP is Extended Parallel Port mode, a high-speed bi-directional mode. ECP is Enhanced Capabilities Port mode, a high-speed bi-directional mode. Base I/O address • 378 (default) Specifies the base I/O address for the parallel port. (This feature is present • 278 only when Parallel Port is set to Enabled) Interrupt • IRQ 5 Specifies the interrupt for the parallel port. (This feature is present • IRQ 7 only when Parallel Port (default) is set to Enabled) DMA • 1 Specifies the DMA channel. (This feature is present • 3 (default) only when Parallel Port Mode is set to ECP) Audio Device • Disabled Enables or disables the onboard audio subsystem. For boards with no onboard audio subsystem, this option • Enabled does not appear; however, this option does appear if a CNR (default) card with an audio subsystem is installed. LAN Device • Disabled Enables or disables the onboard LAN device. For boards with no onboard LAN audio subsystem, this option • Enabled will not appear; however, this option does appear if a CNR (default) card with a LAN subsystem is installed. Modem Device • Disabled Enables or disables a modem device on a CNR card. This option appears only when a CNR card with a modem is • Enabled installed. (default) Legacy USB Support • Disabled Enables or disables Legacy USB support. • Enabled (default) 107 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.4.4 IDE Configuration Submenu To access this submenu, select Advanced on the menu bar and then IDE Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The menu represented in Table 66 is used to configure IDE device options. Table 66. IDE Configuration Submenu Feature Options Description IDE Controller • Disabled Specifies the integrated IDE controller. Primary enables only the primary IDE controller. • Primary Secondary enables only the secondary IDE controller. • Secondary Both enables both IDE controllers. • Both (default) PCI IDE Bus Master • Disabled Enables/disables the use of DMA for hard drive BIOS INT13 reads and writes. • Enabled (default) Hard Disk Pre-Delay • Disabled (default) Specifies the hard disk drive pre-delay. • 3 Seconds • 6 Seconds • 9 Seconds • 12 Seconds • 15 Seconds • 21 Seconds • 30 Seconds Primary IDE Master Select to display Reports type of connected IDE device. sub-menu Primary IDE Slave Select to display Reports type of connected IDE device. sub-menu Secondary IDE Master Select to display Reports type of connected IDE device. sub-menu Secondary IDE Slave Select to display Reports type of connected IDE device. sub-menu 108 BIOS Setup Program 4.4.4.1 Primary/Secondary IDE Master/Slave Submenus To access these submenus, select Advanced on the menu bar, then IDE Configuration, and then the master or slave to be configured. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Primary IDE Master Primary IDE Slave Secondary IDE Master Secondary IDE Slave Diskette Configuration Event Log Configuration Video Configuration There are four IDE submenus: primary master, primary slave, secondary master, and secondary slave. Table 67 shows the format of the IDE submenus. For brevity, only one example is shown. Table 67. Primary/Secondary IDE Master/Slave Submenus Feature Options Description Drive Installed No options Displays the type of drive installed. Type • None Specifies the IDE configuration mode for IDE devices. • User User allows capabilities to be changed. • Auto (default) Auto fills-in capabilities from ATA/ATAPI device. • CD-ROM • ATAPI Removable • Other ATAPI • IDE Removable Maximum Capacity No options Displays the capacity of the drive. Multi-Sector Transfers • Disabled Specifies number of sectors per block for transfers from the hard disk drive to memory. • 2 Sectors Check the hard disk drive’s specifications for optimum • 4 Sectors setting. • 8 Sectors • 16 Sectors (default) continued 109 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 67. Primary/Secondary IDE Master/Slave Submenus (continued) Feature Options Description PIO Mode • Auto (default) Specifies the PIO mode. • Mode 0 • Mode 1 • Mode 2 • Mode 3 • Mode 4 Ultra DMA • Disabled (default) Specifies the Ultra DMA mode for the drive. • Mode 0 • Mode 1 • Mode 2 • Mode 3 • Mode 4 • Mode 5 Cable Detected No options Displays the type of cable connected to the IDE interface: 40-conductor or 80-conductor (for ATA-100 peripherals). 110 BIOS Setup Program 4.4.5 Diskette Configuration Submenu To access this menu, select Advanced on the menu bar and then Diskette Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The submenu represented by Table 68 is used for configuring the diskette drive. Table 68. Diskette Configuration Submenu Feature Options Description Diskette Controller • Disabled Disables or enables the integrated diskette controller. • Enabled (default) Floppy A • Not Installed Specifies the capacity and physical size of diskette drive A. • 360 KB 5¼" • 1.2 MB 5¼" • 720 KB 3½" • 1.44/1.25 MB 3½" (default) • 2.88 MB 3½" Diskette Write Protect • Disabled (default) Disables or enables write protection for the diskette drive. • Enabled 111 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.4.6 Event Log Configuration Submenu To access this menu, select Advanced on the menu bar and then Event Log Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The submenu represented by Table 69 is used to configure the event logging features. Table 69. Event Log Configuration Submenu Feature Options Description Event Log No options Indicates if there is space available in the event log. Event Log Validity No options Indicates if the contents of the event log are valid. View Event Log [Enter] Displays the event log. Clear All Event Logs • No (default) Clears the event log after rebooting. • Yes Event Logging • Disabled Enables logging of events. • Enabled (default) ECC Event Logging • Disabled Enables logging of ECC events. • Enabled (default) Mark Events As Read • Yes (default) Marks all events as read. • No 112 BIOS Setup Program 4.4.7 Video Configuration Submenu To access this menu, select Advanced on the menu bar and then Video Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration The submenu represented in Table 70 is for configuring the video features. Table 70. Video Configuration Submenu Feature Options Description AGP Aperture Size • 64 MB (default) Sets the aperture size for the AGP video controller. • 256 MB Primary Video Adapter • AGP (default) Selects primary video adapter to be used during boot. • PCI 113 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.5 Security Menu To access this menu, select Security from the menu bar at the top of the screen. Maintenance Main Advanced Power Boot Exit Security The menu represented by Table 71 is for setting passwords and security features. Table 71. Security Menu If no password entered previously: Feature Options Description Supervisor Password Is No options Reports if there is a supervisor password set. User Password Is No options Reports if there is a user password set. Set Supervisor Password Password can be up to seven Specifies the supervisor password. alphanumeric characters. Set User Password Password can be up to seven Specifies the user password. alphanumeric characters. Clear User Password • Yes (default) Clears the user password. (Note 1) • No User Access Level • Limited Sets BIOS Setup Utility access rights for user (Note 2) level. • No Access • View Only • Full (default) Unattended Start • Disabled (default) Enabled allows system to complete the boot (Note 1, Note 3, and Note 4) process without a password. The keyboard • Enabled remains locked until a password is entered. A password is required to boot from a diskette. Notes: 1. This feature appears only if a user password has been set. 2. This feature appears only if a supervisor password has been set. 3. If both Legacy USB and Unattended Start are set to enabled in the BIOS setup menu, USB aware operating systems can unlock as PS/2 style keyboard and mouse without requiring the user to enter a password. 4. When Unattended Start is enabled in the BIOS setup menu, a USB aware operating system may override user password protection if used in conjunction with a USB keyboard and mouse without requiring the user to enter a password. 114 BIOS Setup Program 4.6 Power Menu To access this menu, select Power from the menu bar at the top of the screen. Maintenance Main Advanced Security Boot Exit Power ACPI The menu represented in Table 72 is for setting the power management features. Table 72. Power Menu Feature Options Description ACPI Select to display submenu Sets the ACPI power management options. After Power Failure • Stay Off Specifies the mode of operation if an AC power loss occurs. • Last State (default) Stay Off keeps the power off until the power button is • Power On pressed. Last State restores the previous power state before power loss occurred. Power On restores power to the computer. Wake on PME • Stay Off (default) Specifies how the computer responds to a PCI power management event. • Power On Wake on Modem Ring • Stay Off (default) Specifies how the computer responds to an incoming call on an installed modem when the power is off. • Power On 115 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.6.1 ACPI Submenu To access this menu, select Power from the menu bar at the top of the screen and then ACPI. Maintenance Main Advanced Security Boot Exit Power ACPI The submenu represented in Table 73 is for setting the ACPI power options. Table 73. ACPI Submenu Feature Options Description ACPI Suspend State • S1 State Specifies the ACPI sleep state. • S3 State (default) Wake on LAN from S5 • Stay Off (default) In ACPI soft-off mode only, determines how the system responds to a LAN wake-up event. • Power On 116 BIOS Setup Program 4.7 Boot Menu To access this menu, select Boot from the menu bar at the top of the screen. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The menu represented in Table 74 is used to set the boot features and the boot sequence. Table 74. Boot Menu Feature Options Description Quiet Boot • Disabled Disabled displays normal POST messages. • Enabled Enabled displays OEM graphic instead of POST (default) messages. Intel (R) Rapid BIOS Boot • Disabled Enables the computer to boot without running certain POST tests. • Enabled (default) Scan User Flash Area • Disabled Enables the BIOS to scan the flash memory for user (default) binary files that are executed at boot time. • Enabled USB Boot • Disabled Enables the computer to boot from USB boot devices. • Enabled (default) Boot Device Priority Select to display Specifies the boot sequence from the available types of submenu boot devices. Hard Disk Drives Select to display Specifies the boot sequence from the available hard disk submenu drives. Removable Devices Select to display Specifies the boot sequence from the available submenu removable devices. ATAPI CD-ROM Drives Select to display Specifies the boot sequence from the available ATAPI submenu CD-ROM drives. 117 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.7.1 Boot Device Priority Submenu To access this menu, select Boot on the menu bar and then Boot Devices Priority. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The submenu represented in Table 75 is for setting boot devices priority. Table 75. Boot Device Priority Submenu Feature Options Description st 1 Boot Device • Removable Dev. Specifies the boot sequence according to the device type. nd The computer will attempt to boot from up to five devices 2 Boot Device • Hard Drive as specified here. Only one of the devices can be an IDE rd 3 Boot Device • ATAPI CD-ROM hard disk drive. To specify boot sequence: th 4 Boot Device • Intel (R) Boot Agent 1. Select the boot device with <↑> or <↓>. (Note) 2. Press to set the selection as the intended • Disabled boot device. The default settings for the first through fourth boot devices are, respectively: • Removable Dev. • Hard Drive • ATAPI CD-ROM • Intel Boot Agent Note: The boot device identifier for Intel Boot Agent (IBA) may vary depending on the BIOS release. 118 BIOS Setup Program 4.7.2 Hard Disk Drives Submenu To access this menu, select Boot on the menu bar and then Hard Disk Drives. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The submenu represented in Table 76 is for setting hard disk drive priority. Table 76. Hard Disk Drives Submenu Feature Options Description st 1 Hard Disk Drive Dependent on installed Specifies the boot sequence from the available hard (Note) hard drives disk drives. To specify boot sequence: 1. Select the boot device with <↑> or <↓>. 2. Press to set the selection as the intended boot device. Note: This boot device submenu appears only if at least one boot device of this type is installed. This list will display up to twelve hard disk drives, the maximum number of hard disk drives supported by the BIOS. 4.7.3 Removable Devices Submenu To access this menu, select Boot on the menu bar, then Removable Devices. Maintenance Main Advanced Security Power Boot Exit Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The submenu represented in Table 77 is for setting removable device priority. Table 77. Removable Devices Submenu Feature Options Description st 1 Removable Device Dependent on installed Specifies the boot sequence from the available (Note) removable devices removable devices. To specify boot sequence: 1. Select the boot device with <↑> or <↓>. 2. Press to set the selection as the intended boot device. Note: This boot device submenu appears only if at least one boot device of this type is installed. This list will display up to four removable devices, the maximum number of removable devices supported by the BIOS. 119 Intel Desktop Board D845BG/D845PT Technical Product Specification 4.7.4 ATAPI CD-ROM Drives Submenu To access this menu, select Boot on the menu bar and then ATAPI CD-ROM Drives. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The submenu represented in Table 78 is for setting ATAPI CD-ROM drive priority. Table 78. ATAPI CD-ROM Drives Submenu Feature Options Description st 1 ATAPI CDROM Dependent on installed Specifies the boot sequence from the available (Note) ATAPI CD-ROM drives ATAPI CD-ROM drives. To specify boot sequence: 1. Select the boot device with <↑> or <↓>. 2. Press to set the selection as the intended boot device. Note: This boot device submenu appears only if at least one boot device of this type is installed. This list will display up to four ATAPI CD-ROM drives, the maximum number of ATAPI CD-ROM drives supported by the BIOS. 4.8 Exit Menu To access this menu, select Exit from the menu bar at the top of the screen. Maintenance Main Advanced Security Power Boot Exit The menu represented in Table 79 is for exiting the BIOS Setup program, saving changes, and loading and saving defaults. Table 79. Exit Menu Feature Description Exit Saving Changes Exits and saves the changes in CMOS SRAM. Exit Discarding Changes Exits without saving any changes made in the BIOS Setup program. Load Setup Defaults Loads the factory default values for all the Setup options. Load Custom Defaults Loads the custom defaults for Setup options. Save Custom Defaults Saves the current values as custom defaults. Normally, the BIOS reads the Setup values from flash memory. If this memory is corrupted, the BIOS reads the custom defaults. If no custom defaults are set, the BIOS reads the factory defaults. Discard Changes Discards changes without exiting Setup. The option values present when the computer was turned on are used. 120 5 Error Messages and Beep Codes What This Chapter Contains 5.1 BIOS Error Messages...............................................................................................121 5.2 Port 80h POST Codes..............................................................................................123 5.3 Bus Initialization Checkpoints ...................................................................................127 5.4 Speaker ...................................................................................................................128 5.5 BIOS Beep Codes ....................................................................................................128 5.1 BIOS Error Messages Table 80 lists the error messages and provides a brief description of each. Table 80. BIOS Error Messages Error Message Explanation GA20 Error An error occurred with Gate A20 when switching to protected mode during the memory test. Pri Master HDD Error Could not read sector from corresponding drive. Pri Slave HDD Error Sec Master HDD Error Sec Slave HDD Error Pri Master Drive - ATAPI Incompatible Corresponding drive in not an ATAPI device. Run Setup to make Pri Slave Drive - ATAPI Incompatible sure device is selected correctly. Sec Master Drive - ATAPI Incompatible Sec Slave Drive - ATAPI Incompatible A: Drive Error No response from diskette drive. Cache Memory Bad An error occurred when testing L2 cache. Cache memory may be bad. CMOS Battery Low The battery may be losing power. Replace the battery soon. CMOS Display Type Wrong The display type is different than what has been stored in CMOS. Check Setup to make sure type is correct. CMOS Checksum Bad The CMOS checksum is incorrect. CMOS memory may have been corrupted. Run Setup to reset values. CMOS Settings Wrong CMOS values are not the same as the last boot. These values have either been corrupted or the battery has failed. CMOS Date/Time Not Set The time and/or date values stored in CMOS are invalid. Run Setup to set correct values. DMA Error Error during read/write test of DMA controller. FDC Failure Error occurred trying to access diskette drive controller. HDC Failure Error occurred trying to access hard disk controller. continued 121 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 80. BIOS Error Messages (continued) Error Message Explanation Checking NVRAM..... NVRAM is being checked to see if it is valid. Update OK! NVRAM was invalid and has been updated. Updated Failed NVRAM was invalid but was unable to be updated. Keyboard Error Error in the keyboard connection. Make sure keyboard is connected properly. KB/Interface Error Keyboard interface test failed. Memory Size Decreased Memory size has decreased since the last boot. If no memory was removed then memory may be bad. Memory Size Increased Memory size has increased since the last boot. If no memory was added there may be a problem with the system. Memory Size Changed Memory size has changed since the last boot. If no memory was added or removed then memory may be bad. No Boot Device Available System did not find a device to boot. Off Board Parity Error A parity error occurred on an off-board card. This error is followed by an address. On Board Parity Error A parity error occurred in onboard memory. This error is followed by an address. Parity Error A parity error occurred in onboard memory at an unknown address. NVRAM/CMOS/PASSWORD cleared by NVRAM, CMOS, and passwords have been cleared. The system Jumper should be powered down and the jumper removed. Pressed CMOS is ignored and NVRAM is cleared. User must enter Setup. 122 Error Messages and Beep Codes 5.2 Port 80h POST Codes During the POST, the BIOS generates diagnostic progress codes (POST-codes) to I/O port 80h. If the POST fails, execution stops and the last POST code generated is left at port 80h. This code is useful for determining the point where an error occurred. Displaying the POST-codes requires a PCI bus add-in card, often called a POST card. The POST card can decode the port and display the contents on a medium such as a seven-segment display. NOTE ✏ The POST card must be installed in PCI bus connector 1. The tables below offer descriptions of the POST codes generated by the BIOS. Table 81 defines the uncompressed INIT code checkpoints, Table 82 describes the boot block recovery code checkpoints, and Table 83 lists the runtime code uncompressed in F000 shadow RAM. Some codes are repeated in the tables because that code applies to more than one operation. Table 81. Uncompressed INIT Code Checkpoints Code Description of POST Operation D0 NMI is Disabled. Onboard KBC, RTC enabled (if present). Init code Checksum verification starting. D1 Keyboard controller BAT test, CPU ID saved, and going to 4 GB flat mode. D3 Do necessary chipset initialization, start memory refresh, and do memory sizing. D4 Verify base memory. D5 Init code to be copied to segment 0 and control to be transferred to segment 0. D6 Control is in segment 0. To check recovery mode and verify main BIOS checksum. If either it is recovery mode or main BIOS checksum is bad, go to check point E0 for recovery else go to check point D7 for giving control to main BIOS. D7 Find Main BIOS module in ROM image. D8 Uncompress the main BIOS module. D9 Copy main BIOS image to F000 shadow RAM and give control to main BIOS in F000 shadow RAM. Table 82. Boot Block Recovery Code Checkpoints Code Description of POST Operation E0 Onboard Floppy Controller (if any) is initialized. Compressed recovery code is uncompressed in F000:0000 in Shadow RAM and give control to recovery code in F000 Shadow RAM. Initialize interrupt vector tables, initialize system timer, initialize DMA controller and interrupt controller. E8 Initialize extra (Intel Recovery) Module. E9 Initialize floppy drive. EA Try to boot from floppy. If reading of boot sector is successful, give control to boot sector code. EB Booting from floppy failed, look for ATAPI (LS-120, Zip) devices. EC Try to boot from ATAPI. If reading of boot sector is successful, give control to boot sector code. EF Booting from floppy and ATAPI device failed. Give two beeps. Retry the booting procedure again (go to check point E9). 123 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 83. Runtime Code Uncompressed in F000 Shadow RAM Code Description of POST Operation 03 NMI is Disabled. To check soft reset/power-on. 05 BIOS stack set. Going to disable cache if any. 06 POST code to be uncompressed. 07 CPU init and CPU data area init to be done. 08 CMOS checksum calculation to be done next. 0B Any initialization before keyboard BAT to be done next. 0C KB controller I/B free. To issue the BAT command to keyboard controller. 0E Any initialization after KB controller BAT to be done next. 0F Keyboard command byte to be written. 10 Going to issue Pin-23,24 blocking/unblocking command. 11 Going to check pressing of , key during power-on. 12 To init CMOS if "Init CMOS in every boot" is set or key is pressed. Going to disable DMA and Interrupt controllers. 13 Video display is disabled and port-B is initialized. Chipset init about to begin. 14 8254 timer test about to start. 19 About to start memory refresh test. 1A Memory Refresh line is toggling. Going to check 15 µs ON/OFF time. 23 To read 8042 input port and disable Megakey GreenPC feature. Make BIOS code segment writeable. 24 To do any setup before Int vector init. 25 Interrupt vector initialization to begin. To clear password if necessary. 27 Any initialization before setting video mode to be done. 28 Going for monochrome mode and color mode setting. 2A Different buses init (system, static, output devices) to start if present. (See Section 5.3 for details of different buses.) 2B To give control for any setup required before optional video ROM check. 2C To look for optional video ROM and give control. 2D To give control to do any processing after video ROM returns control. 2E If EGA/VGA not found then do display memory R/W test. 2F EGA/VGA not found. Display memory R/W test about to begin. 30 Display memory R/W test passed. About to look for the retrace checking. 31 Display memory R/W test or retrace checking failed. To do alternate Display memory R/W test. 32 Alternate Display memory R/W test passed. To look for the alternate display retrace checking. 34 Video display checking over. Display mode to be set next. 37 Display mode set. Going to display the power-on message. 38 Different buses init (input, IPL, general devices) to start if present. (See Section 5.3 for details of different buses.) 39 Display different buses initialization error messages. (See Section 5.3 for details of different buses.) 3A New cursor position read and saved. To display the Hit message. continued 124 Error Messages and Beep Codes Table 83. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation 40 To prepare the descriptor tables. 42 To enter in virtual mode for memory test. 43 To enable interrupts for diagnostics mode. 44 To initialize data to check memory wrap around at 0:0. 45 Data initialized. Going to check for memory wrap around at 0:0 and finding the total system memory size. 46 Memory wrap around test done. Memory size calculation over. About to go for writing patterns to test memory. 47 Pattern to be tested written in extended memory. Going to write patterns in base 640k memory. 48 Patterns written in base memory. Going to find out amount of memory below 1M memory. 49 Amount of memory below 1M found and verified. Going to find out amount of memory above 1M memory. 4B Amount of memory above 1M found and verified. Check for soft reset and going to clear memory below 1M for soft reset. (If power on, go to check point # 4Eh). 4C Memory below 1M cleared. (SOFT RESET) Going to clear memory above 1M. 4D Memory above 1M cleared. (SOFT RESET) Going to save the memory size. (Go to check point # 52h). 4E Memory test started. (NOT SOFT RESET) About to display the first 64k memory size. 4F Memory size display started. This will be updated during memory test. Going for sequential and random memory test. 50 Memory testing/initialization below 1M complete. Going to adjust displayed memory size for relocation/shadow. 51 Memory size display adjusted due to relocation/ shadow. Memory test above 1M to follow. 52 Memory testing/initialization above 1M complete. Going to save memory size information. 53 Memory size information is saved. CPU registers are saved. Going to enter in real mode. 54 Shutdown successful, CPU in real mode. Going to disable gate A20 line and disable parity/NMI. 57 A20 address line, parity/NMI disable successful. Going to adjust memory size depending on relocation/shadow. 58 Memory size adjusted for relocation/shadow. Going to clear Hit message. 59 Hit message cleared. message displayed. About to start DMA and interrupt controller test. 60 DMA page register test passed. To do DMA#1 base register test. 62 DMA#1 base register test passed. To do DMA#2 base register test. 65 DMA#2 base register test passed. To program DMA unit 1 and 2. 66 DMA unit 1 and 2 programming over. To initialize 8259 interrupt controller. 7F Extended NMI sources enabling is in progress. 80 Keyboard test started. Clearing output buffer, checking for stuck key, to issue keyboard reset command. 81 Keyboard reset error/stuck key found. To issue keyboard controller interface test command. 82 Keyboard controller interface test over. To write command byte and init circular buffer. 83 Command byte written, global data init done. To check for lock-key. continued 125 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 83. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation 84 Lock-key checking over. To check for memory size mismatch with CMOS. 85 Memory size check done. To display soft error and check for password or bypass setup. 86 Password checked. About to do programming before setup. 87 Programming before setup complete. To uncompress SETUP code and execute CMOS setup. 88 Returned from CMOS setup program and screen is cleared. About to do programming after setup. 89 Programming after setup complete. Going to display power-on screen message. 8B First screen message displayed. message displayed. PS/2 Mouse check and extended BIOS data area allocation to be done. 8C Setup options programming after CMOS setup about to start. 8D Going for hard disk controller reset. 8F Hard disk controller reset done. Floppy setup to be done next. 91 Floppy setup complete. Hard disk setup to be done next. 95 Init of different buses optional ROMs from C800 to start. (See Section 5.3 for details of different buses.) 96 Going to do any init before C800 optional ROM control. 97 Any init before C800 optional ROM control is over. Optional ROM check and control will be done next. 98 Optional ROM control is done. About to give control to do any required processing after optional ROM returns control and enable external cache. 99 Any initialization required after optional ROM test over. Going to setup timer data area and printer base address. 9A Return after setting timer and printer base address. Going to set the RS-232 base address. 9B Returned after RS-232 base address. Going to do any initialization before Coprocessor test. 9C Required initialization before Coprocessor is over. Going to initialize the Coprocessor next. 9D Coprocessor initialized. Going to do any initialization after Coprocessor test. 9E Initialization after Coprocessor test is complete. Going to check extended keyboard, keyboard ID and num-lock. A2 Going to display any soft errors. A3 Soft error display complete. Going to set keyboard typematic rate. A4 Keyboard typematic rate set. To program memory wait states. A5 Going to enable parity/NMI. A7 NMI and parity enabled. Going to do any initialization required before giving control to optional ROM at E000. A8 Initialization before E000 ROM control over. E000 ROM to get control next. A9 Returned from E000 ROM control. Going to do any initialization required after E000 optional ROM control. AA Initialization after E000 optional ROM control is over. Going to display the system configuration. AB Put INT13 module runtime image to shadow. AC Generate MP for multiprocessor support (if present). AD Put CGA INT10 module (if present) in Shadow. continued 126 Error Messages and Beep Codes Table 83. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation AE Uncompress SMBIOS module and init SMBIOS code and form the runtime SMBIOS image in shadow. B1 Going to copy any code to specific area. 00 Copying of code to specific area done. Going to give control to INT-19 boot loader. 5.3 Bus Initialization Checkpoints The system BIOS gives control to the different buses at several checkpoints to do various tasks. Table 84 describes the bus initialization checkpoints. Table 84. Bus Initialization Checkpoints Checkpoint Description 2A Different buses init (system, static, and output devices) to start if present. 38 Different buses init (input, IPL, and general devices) to start if present. 39 Display different buses initialization error messages. 95 Init of different buses optional ROMs from C800 to start. While control is inside the different bus routines, additional checkpoints are output to port 80h as WORD to identify the routines under execution. In these WORD checkpoints, the low byte of the checkpoint is the system BIOS checkpoint from which the control is passed to the different bus routines. The high byte of the checkpoint is the indication of which routine is being executed in the different buses. Table 85 describes the upper nibble of the high byte and indicates the function that is being executed. Table 85. Upper Nibble High Byte Functions Value Description 0 func#0, disable all devices on the bus concerned. 1 func#1, static devices init on the bus concerned. 2 func#2, output device init on the bus concerned. 3 func#3, input device init on the bus concerned. 4 func#4, IPL device init on the bus concerned. 5 func#5, general device init on the bus concerned. 6 func#6, error reporting for the bus concerned. 7 func#7, add-on ROM init for all buses. 127 Intel Desktop Board D845BG/D845PT Technical Product Specification Table 86 describes the lower nibble of the high byte and indicates the bus on which the routines are being executed. Table 86. Lower Nibble High Byte Functions Value Description 0 Generic DIM (Device Initialization Manager) 1 On-board System devices 2 ISA devices 3 EISA devices 4 ISA PnP devices 5 PCI devices 5.4 Speaker A 47 Ω inductive speaker is mounted on the D845BG and the D845PT board. The speaker provides audible error code (beep code) information during POST. For information about Refer to The location of the onboard speaker on the D845BG board Figure 1, page 14 The location of the onboard speaker on the D845PT board Figure 2, page 15 5.5 BIOS Beep Codes Whenever a recoverable error occurs during POST, the BIOS displays an error message describing the problem (see Table 87). The BIOS also issues a beep code (one long tone followed by two short tones) during POST if the video configuration fails (a faulty video card or no card installed) or if an external ROM module does not properly checksum to zero. An external ROM module (for example, a video BIOS) can also issue audible errors, usually consisting of one long tone followed by a series of short tones. For more information on the beep codes issued, check the documentation for that external device. There are several POST routines that issue a POST terminal error and shut down the system if they fail. Before shutting down the system, the terminal-error handler issues a beep code signifying the test point error, writes the error to I/O port 80h, attempts to initialize the video and writes the error in the upper left corner of the screen (using both monochrome and color adapters). 128 Error Messages and Beep Codes If POST completes normally, the BIOS issues one short beep before passing control to the operating system. Table 87. Beep Codes Beep Description 1 Refresh failure 2 Parity cannot be reset 3 First 64 KB memory failure 4 Timer not operational 5 Not used 6 8042 GateA20 cannot be toggled 7 Exception interrupt error 8 Display memory R/W error 9 Not used 10 CMOS Shutdown register test error 11 Invalid BIOS (e.g. POST module not found, etc.) 129 Intel Desktop Board D845BG/D845PT Technical Product Specification 130