INTEL D845PEBT2
Specifications
Audio
See Manufacturing Options on page 13 of datasheet
BIOS
Intel/AMI BIOS (resident in the Intel 82802AB FWH) | Support for Advanced Configuration and Power Interface (ACPI), Plug and Play, and SMBIOS
Chipset
Intel 845PE Chipset, consisting of:Intel 82845PE Memory Controller Hub (MCH) | Intel 82801DB I/O Controller Hub (ICH4) | Intel 82802AB (4 Mbit) Firmware Hub (FWH)
Expansion Capabilities
Five PCI bus add-in card connectors. Depending on the board version, SMBus is routed to PCI bus connector 1 or 2. See Table 29 on page 57 of datasheet
Form Factor
ATX (Depending on the board version, dimensions are 12.00 inches by 8.20 inches, or 12.00 inches by 8.50 inches. See Table 54 on page 74 of datasheet.)
Hardware Monitor Subsystem
Hardware management ASIC | Voltage sense to detect out of range power supply voltages | Thermal sense to detect out of range thermal values | Three fan sense inputs used to monitor fan activity | Fan speed control
I/O Control
SMSC LPC47M172 LPC Bus I/O controller
Instantly Available PC Technology
Support for PCI Local Bus Specification Revision 2.2 | Suspend to RAM support | Wake on PCI, CNR, RS-232, front panel, PS/2 devices, and USB ports
LAN
Intel 82562ET 10/100 Mbits/sec Platform LAN Connect (PLC) device
Memory
Two 184-pin DDR SDRAM Dual Inline Memory Module (DIMM) sockets | Support for DDR 333 and DDR 266 | Support for up to 2 GB of system memory
Peripheral Interfaces
Up to six USB ports | One serial port | 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
Processor
Intel Pentium IV
Support for an Intel Pentium 4 processor in a mPGA478 socket with a 400/533 MHz system bus | Support for an Intel Celeron processor in a mPGA478 socket with a 400 MHz system bus
Serial ATA (SATA) or IDE RAID
See Manufacturing Options on page 13 of datasheet
USB
Support for USB 2.0 devices
Video
AGP connector supporting 1.5 V 4X AGP cards
Features
- 2.5 V (only) 184-pin DDR SDRAM DIMMs with gold-plated contacts
- Chassis intrusion detection
- Instantly Available PC technology
- Internal ambient temperature sensor
- LAN wake capabilities
- One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support
- One serial port
- PCI bus master interface
- Resume on Ring
- Serial IRQ interface compatible with serialized IRQ support for PCI systems
- Thermal and voltage monitoring
- Wake from PS/2 keyboard
- Wake from USB
Datasheet
Intel=D845PEBT2=datasheet1-1712561646.pdf
991 KiB
Extracted Text
®
Intel Desktop Board D845PEBT2
Technical Product Specification
September 2002
Order Number: C15333-001
®
The Intel Desktop Board D845PEBT2 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 D845PEBT2 Specification Update.
Revision History
Revision Revision History Date
-001 Initial release of the Intel Desktop Board D845PEBT2 Technical Product September 2002
Specification.
This product specification applies to only the standard Intel Desktop Board D845PEBT2 with
BIOS identifier BT84520A.86A.
Changes to this specification will be published in the Intel Desktop Board D845PEBT2
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 Board D845PEBT2 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, Pentium, Celeron, and LANDesk 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 2002, Intel Corporation. All rights reserved.
Preface
This Technical Product Specification (TPS) specifies the Intel Desktop Board D845PEBT2 layout,
components, connectors, power and environmental requirements, and BIOS. The TPS describes
the standard product and available manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Desktop Board and its
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 Desktop Board D845PEBT2
2 A map of the resources of the Desktop Board D845PEBT2
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 D845PEBT2 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 Desktop Board D845PEBT2, 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)
Mbits/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 Overview ....................................................................................................................12
1.1.1 Feature Summary ........................................................................................12
1.1.2 Manufacturing Options .................................................................................13
1.1.3 Board Layout................................................................................................14
1.1.4 Block Diagram..............................................................................................15
1.2 Online Support ...........................................................................................................16
1.3 Operating System Support .........................................................................................16
1.4 Design Specifications .................................................................................................17
1.5 Processor ...................................................................................................................20
1.6 System Memory .........................................................................................................21
®
1.7 Intel 845PE Chipset..................................................................................................23
1.7.1 AGP .............................................................................................................24
1.7.2 USB..............................................................................................................24
1.7.3 IDE Support .................................................................................................25
1.7.4 Real-Time Clock, CMOS SRAM, and Battery...............................................26
®
1.7.5 Intel 82802AB Firmware Hub (FWH) ..........................................................26
1.8 IDE RAID Controller (Optional)...................................................................................27
1.9 Serial ATA Controller (Optional) .................................................................................27
1.10 I/O Controller..............................................................................................................28
1.10.1 Serial Ports ..................................................................................................28
1.10.2 Parallel Port..................................................................................................28
1.10.3 Diskette Drive Controller ..............................................................................28
1.10.4 Keyboard and Mouse Interface ....................................................................29
1.11 IEEE 1394a-2000 Controller (Optional) ......................................................................29
1.12 Audio Subsystem........................................................................................................30
1.12.1 6-Channel Audio Subsystem (Optional) .......................................................30
1.12.2 2-Channel Audio Subsystem (Optional) .......................................................31
1.12.3 Audio Connectors.........................................................................................32
1.12.4 Audio Subsystem Software ..........................................................................32
1.13 LAN Subsystem..........................................................................................................33
®
1.13.1 Intel 82562ET Physical Layer Interface Device ..........................................33
1.13.2 RJ-45 LAN Connector with Integrated LEDs ................................................33
1.13.3 LAN Subsystem Software ............................................................................34
1.14 CNR (Optional)...........................................................................................................34
1.15 Hardware Management Subsystem............................................................................35
1.15.2 Fan Monitoring .............................................................................................36
1.15.3 Chassis Intrusion and Detection...................................................................37
1.16 Power Management ...................................................................................................37
1.16.1 ACPI.............................................................................................................38
1.16.2 Hardware Support ........................................................................................40
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Intel Desktop Board D845PEBT2 Technical Product Specification
2 Technical Reference
2.1 Introduction.................................................................................................................45
2.2 Memory Map ..............................................................................................................45
2.3 Fixed I/O Map.............................................................................................................46
2.4 DMA Channels ...........................................................................................................47
2.5 PCI Configuration Space Map ....................................................................................47
2.6 Interrupts ....................................................................................................................48
2.7 PCI Interrupt Routing Map..........................................................................................49
2.8 Connectors.................................................................................................................51
2.8.1 Back Panel Connectors................................................................................52
2.8.2 Internal I/O Connectors ................................................................................56
2.8.3 External I/O Connectors...............................................................................68
2.9 Jumper Blocks............................................................................................................72
2.9.1 Front Panel Audio Connector/Jumper Block.................................................72
2.9.2 BIOS Setup Configuration Jumper Block......................................................73
2.10 Mechanical Considerations.........................................................................................74
2.10.1 D845PEBT2 Form Factor.............................................................................74
2.10.2 I/O Shield .....................................................................................................76
2.11 Electrical Considerations ............................................................................................79
2.11.1 Power Consumption.....................................................................................79
2.11.2 Add-in Board Considerations........................................................................79
2.11.3 Standby Current Requirements....................................................................80
2.11.4 Fan Connector Current Capability ................................................................81
2.11.5 Power Supply Considerations ......................................................................82
2.12 Thermal Considerations..............................................................................................83
2.13 Reliability ....................................................................................................................85
2.14 Environmental ............................................................................................................85
2.15 Regulatory Compliance ..............................................................................................86
2.15.1 Safety Regulations .......................................................................................86
2.15.2 EMC Regulations .........................................................................................86
2.15.3 Product Certification Markings (Board Level) ...............................................87
3 Overview of BIOS Features
3.1 Introduction.................................................................................................................89
3.2 BIOS Flash Memory Organization ..............................................................................90
3.3 PCI Autoconfiguration.................................................................................................90
3.4 System Management BIOS (SMBIOS).......................................................................90
3.5 Legacy USB Support ..................................................................................................91
3.6 BIOS Updates ............................................................................................................91
3.6.1 Language Support........................................................................................92
3.6.2 Custom Splash Screen.................................................................................92
3.7 Recovering BIOS Data ...............................................................................................92
3.8 Boot Options...............................................................................................................93
3.8.1 CD-ROM Boot..............................................................................................93
3.8.2 Network Boot................................................................................................93
3.8.3 Booting Without Attached Devices ...............................................................93
3.9 Changing the Default Boot Device During POST........................................................94
vi
Contents
®
3.10 Fast Booting Systems with Intel Rapid BIOS Boot....................................................94
3.10.1 Peripheral Selection and Configuration ........................................................94
3.10.2 Intel Rapid BIOS Boot ..................................................................................95
3.11 BIOS Security Features..............................................................................................96
4 BIOS Setup Program
4.1 Introduction.................................................................................................................97
4.2 Maintenance Menu.....................................................................................................98
4.3 Main Menu..................................................................................................................99
4.4 Advanced Menu........................................................................................................100
4.4.1 PCI Configuration Submenu.......................................................................101
4.4.2 Boot Configuration Submenu .....................................................................102
4.4.3 Peripheral Configuration Submenu.............................................................103
4.4.4 IDE Configuration Submenu.......................................................................105
4.4.5 Diskette Configuration Submenu................................................................107
4.4.6 Event Log Configuration Submenu.............................................................108
4.4.7 Video Configuration Submenu....................................................................109
4.4.8 USB Configuration Submenu .....................................................................110
4.4.9 Chipset Configuration Submenu.................................................................111
4.4.10 Fan Control Configuration Submenu ..........................................................112
4.5 Security Menu ..........................................................................................................113
4.6 Power Menu .............................................................................................................114
4.6.1 ACPI Submenu ..........................................................................................114
4.7 Boot Menu................................................................................................................115
4.7.1 Boot Device Priority Submenu....................................................................116
4.7.2 Hard Disk Drives Submenu ........................................................................117
4.7.3 Removable Devices Submenu ...................................................................117
4.7.4 ATAPI CD-ROM Drives Submenu..............................................................118
4.8 Exit Menu .................................................................................................................118
5 Error Messages and Beep Codes
5.1 BIOS Error Messages...............................................................................................119
5.2 Port 80h POST Codes..............................................................................................121
5.3 Bus Initialization Checkpoints ...................................................................................125
5.4 Speaker....................................................................................................................126
5.5 BIOS Beep Codes ....................................................................................................126
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Intel Desktop Board D845PEBT2 Technical Product Specification
Figures
1. Desktop Board D845PEBT2 Components ..................................................................14
2. Block Diagram............................................................................................................15
3. Intel 845PE Chipset Block Diagram............................................................................23
4. USB Port Configuration ..............................................................................................24
5. 6-Channel Audio Subsystem Block Diagram ..............................................................31
6. 2-Channel Audio Subsystem Block Diagram ..............................................................32
7. LAN Connector LED Locations...................................................................................33
8. ICH4 and CNR Signal Interface..................................................................................34
9. Thermal Monitoring.....................................................................................................36
10. Location of the Standby Power Indicator LED ............................................................43
11. Back Panel Connectors ..............................................................................................52
12. Location of the Board’s AA Number............................................................................57
13. Power and Hardware Control Connectors ..................................................................58
14. D845PEBT2 Add-in Board and Peripheral Interface Connectors................................61
15. External I/O Connectors .............................................................................................68
16. Front Panel Connector Pins........................................................................................70
17. Location of the Jumper Blocks....................................................................................72
18. 12" x 8.2" Desktop Board Dimensions ........................................................................74
19. 12" x 8.5" Desktop Board Dimensions ........................................................................75
20. I/O Shield Dimensions for Boards with a 6-Channel Audio Subsystem and
IEEE1394a-2000 Connector.......................................................................................76
21. I/O Shield Dimensions for Boards with a 6-Channel Audio Subsystem
and Without IEEE 1394a-2000 Connector..................................................................77
22. I/O Shield Dimensions for Boards with a 2-Channel Audio Subsystem.......................78
23. Localized High Temperature Zones............................................................................84
Tables
1. Feature Summary.......................................................................................................12
2. Manufacturing Options ...............................................................................................13
3. Specifications .............................................................................................................17
4. Supported Memory Configurations .............................................................................22
5. LAN Connector LED States........................................................................................33
6. Effects of Pressing the Power Switch .........................................................................38
7. Power States and Targeted System Power ................................................................39
8. Wake-up Devices and Events.....................................................................................40
9. Fan Connector Function/Operation.............................................................................41
10. System Memory Map..................................................................................................45
11. I/O Map ......................................................................................................................46
12. DMA Channels ...........................................................................................................47
13. PCI Configuration Space Map ....................................................................................47
14. Interrupts ....................................................................................................................48
15. PCI Interrupt Routing Map..........................................................................................50
16. PS/2 Mouse/Keyboard Connector ..............................................................................53
17. IEEE 1394a-2000 Connector (Optional) .....................................................................53
18. USB Connectors.........................................................................................................53
viii
Contents
19. Serial Port A Connector..............................................................................................53
20. Parallel Port Connector...............................................................................................54
21. Digital S/PDIF Connector (Optional) ...........................................................................54
22. Optical S/PDIF Connector (Optional)..........................................................................54
23. Audio Rear Left and Right Out Connector (Optional)..................................................54
24. Audio Center and LFE Out Connector (Optional)........................................................54
25. Audio Line In Connector .............................................................................................55
26. Audio Line Out Connector (Front Left and Right Out for 6-Channel Audio)................55
27. Mic In Connector ........................................................................................................55
28. LAN Connector...........................................................................................................55
29. SMBus Routing...........................................................................................................57
30. ATX12V Power Connector..........................................................................................59
31. Rear Chassis Fan Connector .....................................................................................59
32. Processor Fan Connector...........................................................................................59
33. Main Power Connector ...............................................................................................60
34. Chassis Intrusion Connector.......................................................................................60
35. Front Chassis Fan Connector.....................................................................................60
36. CNR Connector (Optional)..........................................................................................62
37. PCI Bus Connectors...................................................................................................63
38. AGP Connector ..........................................................................................................64
39. ATAPI-Style CD-ROM Connector...............................................................................65
40. Diskette Drive Connector............................................................................................65
41. PCI IDE Connectors ...................................................................................................66
42. SCSI LED Connector..................................................................................................66
43. IDE RAID Connectors (Optional) ................................................................................67
44. SATA/SATA RAID Connectors (Optional)...................................................................67
45. Front Panel Audio Connector .....................................................................................69
46. Front Panel USB Connector .......................................................................................69
47. Front Panel IEEE 1394a-2000 Connectors (Optional) ................................................69
48. Front Panel Connector ...............................................................................................70
49. States for a One-Color Power LED.............................................................................71
50. States for a Two-Color Power LED.............................................................................71
51. Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector ........................71
52. Front Panel Audio Connector or Jumper Block...........................................................73
53. BIOS Setup Configuration Jumper Settings................................................................73
54. Board Dimensions ......................................................................................................74
55. Power Usage..............................................................................................................79
56. Standby Current Requirements ..................................................................................80
57. Fan Connector Current Capability ..............................................................................81
58. Thermal Considerations for Components ...................................................................84
59. Desktop Board D845PEBT2 Environmental Specifications.........................................85
60. Safety Regulations .....................................................................................................86
61. EMC Regulations........................................................................................................86
62. Boot Device Menu Options.........................................................................................94
63. Supervisor and User Password Functions..................................................................96
64. BIOS Setup Program Menu Bar .................................................................................97
65. BIOS Setup Program Function Keys ..........................................................................98
66. Maintenance Menu.....................................................................................................98
ix
Intel Desktop Board D845PEBT2 Technical Product Specification
67. Main Menu..................................................................................................................99
68. Advanced Menu........................................................................................................100
69. PCI Configuration Submenu .....................................................................................101
70. Boot Configuration Submenu....................................................................................102
71. Peripheral Configuration Submenu...........................................................................103
72. IDE Configuration Submenu .....................................................................................105
73. Primary/Secondary IDE Master/Slave Submenus.....................................................106
74. Diskette Configuration Submenu ..............................................................................107
75. Event Log Configuration Submenu...........................................................................108
76. Video Configuration Submenu..................................................................................109
77. USB Configuration Submenu....................................................................................110
78. Chipset Configuration Submenu...............................................................................111
79. Fan Control Configuration Submenu ........................................................................112
80. Security Menu ..........................................................................................................113
81. Power Menu .............................................................................................................114
82. ACPI Submenu.........................................................................................................114
83. Boot Menu................................................................................................................115
84. Boot Device Priority Submenu..................................................................................116
85. Hard Disk Drives Submenu ......................................................................................117
86. Removable Devices Submenu..................................................................................117
87. ATAPI CD-ROM Drives Submenu ............................................................................118
88. Exit Menu .................................................................................................................118
89. BIOS Error Messages...............................................................................................119
90. Uncompressed INIT Code Checkpoints....................................................................121
91. Boot Block Recovery Code Checkpoints ..................................................................121
92. Runtime Code Uncompressed in F000 Shadow RAM ..............................................122
93. Bus Initialization Checkpoints ...................................................................................125
94. Upper Nibble High Byte Functions............................................................................125
95. Lower Nibble High Byte Functions............................................................................126
96. Beep Codes..............................................................................................................127
x
1 Product Description
What This Chapter Contains
1.1 Overview ....................................................................................................................12
1.2 Online Support ...........................................................................................................16
1.3 Operating System Support .........................................................................................16
1.4 Design Specifications .................................................................................................17
1.5 Processor ...................................................................................................................20
1.6 System Memory .........................................................................................................21
®
1.7 Intel 845PE Chipset..................................................................................................23
1.8 IDE RAID Controller (Optional)...................................................................................27
1.9 Serial ATA Controller (Optional) .................................................................................27
1.10 I/O Controller..............................................................................................................28
1.11 IEEE 1394a-2000 Controller (Optional) ......................................................................29
1.12 Audio Subsystem........................................................................................................30
1.13 LAN Subsystem..........................................................................................................33
1.14 CNR (Optional)...........................................................................................................34
1.15 Hardware Management Subsystem............................................................................35
1.16 Power Management ...................................................................................................37
11
Intel Desktop Board D845PEBT2 Technical Product Specification
1.1 Overview
1.1.1 Feature Summary
®
Table 1 summarizes the major features of the Intel Desktop Board D845PEBT2.
Table 1. Feature Summary
Form Factor
ATX (Depending on the board version, dimensions are 12.00 inches by 8.20
inches, or 12.00 inches by 8.50 inches. See Table 54 on page 74.)
® ®
Processor • Support for an Intel Pentium 4 processor in a mPGA478 socket with a
400/533 MHz system bus
® ®
• Support for an Intel Celeron processor in a mPGA478 socket with a 400 MHz
system bus
Memory • Two 184-pin DDR SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for DDR 333 and DDR 266
• Support for up to 2 GB of system memory
NOTE: The Desktop Board has 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. For the latest
memory information, please refer to the following Intel web site:
http://developer.intel.com/design/motherbd/bt2/bt2_mem.htm
®
Chipset
Intel 845PE Chipset, consisting of:
®
• Intel 82845PE Memory Controller Hub (MCH)
®
• Intel 82801DB I/O Controller Hub (ICH4)
®
• Intel 82802AB (4 Mbit) Firmware Hub (FWH)
Video AGP connector supporting 1.5 V 4X AGP cards
Audio See Manufacturing Options on page 13
USB Support for USB 2.0 devices
Serial ATA (SATA)
See Manufacturing Options on page 13
or
IDE RAID
Peripheral • Up to six USB ports
Interfaces
• One serial port
• 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 Five PCI bus add-in card connectors. Depending on the board version, SMBus is
Capabilities routed to PCI bus connector 1 or 2. See Table 29 on page 57.
I/O Control SMSC LPC47M172 LPC Bus I/O controller
®
LAN Intel 82562ET 10/100 Mbits/sec Platform LAN Connect (PLC) device
continued
12
Product Description
Table 1. Feature Summary (continued)
Hardware Monitor • Hardware management ASIC
Subsystem
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• Three fan sense inputs used to monitor fan activity
• Fan speed control
BIOS • Intel/AMI BIOS (resident in the Intel 82802AB 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 Desktop Board D845PEBT2’s compliance level with ACPI, Section 1.4, page 17
Plug and Play, and SMBIOS.
1.1.2 Manufacturing Options
Table 2 describes the manufacturing options for the Desktop Board D845PEBT2. 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 2. Manufacturing Options
Audio The Desktop Board D845PEBT2 includes one of the following for AC ’97
processing:
• 6-channel audio subsystem using the Analog Devices AD1980 codec
• 2-channel audio subsystem using the Analog Devices AD1981B codec
CNR
Communication and Networking Riser (CNR) connector.
NOTE: LAN and USB CNR cards are not supported.
IEEE 1394a-2000 • Agere Systems FW323 controller
• Three IEEE 1394a-2000 ports
SATA/SATA RAID The Desktop Board D845PEBT2 includes one of the following:
or • SATA subsystem consisting of:
IDE RAID — Silicon Image SiI 3112A controller supporting individual drives, and RAID 0
and RAID 1 configurations
— Two SATA connectors supporting a total of two drives
• IDE RAID subsystem consisting of:
†
— Promise Technology PDC20267 ATA/100 controller supporting RAID 0,
RAID 1, and RAID 0+1 configurations
— Two IDE connectors supporting a total of four drives (Boards with IDE RAID
have four IDE connectors. Two are connected to the IDE RAID controller)
For information about Refer to
Available configurations for the Desktop Board D845PEBT2 Section 1.2, page 16
13
Intel Desktop Board D845PEBT2 Technical Product Specification
1.1.3 Board Layout
Figure 1 shows the location of the major components on the Desktop Board D845PEBT2.
A B C D
E
X
F
W
V
U
G
T
S
H
R
I
Q
P O N M L K J
OM15027
A Audio codec M Intel 82802AB Firmware Hub (FWH)
B Intel 82562ET PLC device N Intel 82801DB I/O Controller Hub (ICH4)
C AGP connector O Speaker
D Back panel connectors P Front panel connector
E +12 V power connector (ATX12V) Q IDE RAID connectors (optional)
F mPGA478 processor socket R SATA/SATA RAID connectors (optional)
G Intel 82845PE Memory Controller Hub (MCH) S SATA/SATA RAID or IDE RAID controller
H DIMM sockets T Battery
I I/O controller U IEEE 1394a-2000 front panel connectors (optional)
J Power connector V PCI bus add-in card connectors
K IDE connectors W IEEE 1394a-2000 controller (optional)
L Diskette drive connector X CNR connector (optional)
Figure 1. Desktop Board D845PEBT2 Components
14
Product Description
1.1.4 Block Diagram
Figure 2 is a block diagram of the major functional areas of the Desktop Board D845PEBT2. See
Figure 4 on page 24 for USB port routing.
= connector or socket
Back Panel/
Front Panel
USB Ports
USB
Serial Port
Parallel Port
LPC Bus
Primary/ UDMA 33 and
I/O
PS/2 Mouse
Secondary IDE ATA-66/100
Controller
PS/2 Keyboard
Diskette Drive
mPGA478 System Bus
Connector
Processor Socket (400/533 MHz)
LPC
Bus
AGP
Intel 82802AB
Interface Intel 82845PE Intel 82801DB
AHA 4 Mbit
Memory Controller I/O Controller Hub
Bus Firmware Hub
(ICH4)
Hub (MCH)
4X AGP
(FWH)
Connector
(1.5 V only)
Intel 845PE Chipset
CSMA/CD
Memory Bus Unit Interface
Two DIMM Banks Physical
LAN
SMBus Layer
Connector
Interface
Primary/Secondary SATA/SATA RAID
SATA/SATA RAID or IDE RAID
or IDE RAID Controller
AC Link CNR
Connector
Three FW323
(Optional)
IEEE 1394a-2000 IEEE 1394a-2000 SMBus
Ports (Optional) Controller (Optional)
Front Left and Right Out
PCI Bus
Center and LFE Out
Rear Left and Right Out
AD1980
Digital S/PDIF
PCI Slot 1 SMBus
Audio Codec
Optical S/PDIF
(Optional)
PCI Slot 2
Line In
PCI Slot 3 Mic In
Hardware CD-ROM
PCI Slot 4
Monitoring
and Fan
PCI Slot 5
Control ASIC
Line Out
AD1981B Line In
Audio Codec
Mic In
(Optional)
CD-ROM
OM15028
Figure 2. Block Diagram
15
Intel Desktop Board D845PEBT2 Technical Product Specification
1.2 Online Support
To find information about… Visit this World Wide Web site:
The Desktop Board D845PEBT2, look http://www.intel.com/design/motherbd
under “Desktop Board Products” or
“Desktop Board Support” http://support.intel.com/support/motherboards/desktop
Available configurations for the Desktop http://developer.intel.com/design/motherbd/bt2/bt2_available.htm
Board D845PEBT2
Processor data sheets http://www.intel.com/design/litcentr
ICH4 addressing http://developer.intel.com/design/chipsets/datashts
Custom splash screens http://www.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
1.3 Operating System Support
The Desktop Board D845PEBT2 support drivers for onboard hardware and subsystems under the
following operating systems:
†
• Microsoft Windows XP
• Windows 2000
• Windows ME
†
• Windows NT 4.0
• Windows 98 SE
NOTES
✏
• Third party vendors may offer other drivers.
• IEEE 1394a-2000 support has been tested with Windows 2000 and Windows XP drivers and is
not currently supported by any other operating system.
• USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not
currently supported by any other operating system in the list above.
For information about Refer to
Supported drivers Section 1.2, page 16
16
Product Description
1.4 Design Specifications
Table 3 lists the specifications applicable to the Desktop Board D845PEBT2.
Table 3. Specifications
Reference Specification Version, Revision Date, The information is
Name Title and Ownership available from…
1394 IEEE Std 1394-1995, November 8, 2001 http://standards.ieee.org/
IEEE Standard for a High Institute of Electrical and catalog/olis/busarch.html
Performance Serial Bus Electronic Engineers.
IEEE Std 1394a-2000, June 29, 2000 http://standards.ieee.org/
IEEE Standard for a High Institute of Electrical and catalog/olis/busarch.html
Performance Serial Electronic Engineers.
Bus – Amendment 1
AC ’97 Audio Codec ’97 Revision 2.2, ftp://download.intel.com/ial/
September 2000, scalableplatforms/
Intel Corporation. ac97r22.pdf
ACPI Advanced Configuration Version 2.0a, http://www.acpi.info/
and Power Interface March 31, 2002, DOWNLOADS/
Specification Compaq Computer ACPIspec-2-0a.pdf
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 8.0 AMIBIOS 8.0, http://www.ami.com/support/
2001, doc/amibios8.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 2.1, http://www.formfactors.org/
June 2002, developer/specs/atx/
Intel Corporation. atx2_1.pdf
ATX12V ATX/ATX12V Power Version 1.2, http://www.formfactors.org/
Supply Design Guide August 2000, developer/specs/atx/
Intel Corporation. atxspecs.htm
BIS Boot Integrity Services Version 1.0, http://www.intel.com/labs/
(BIS) Application August 4, 1999, manage/wfm/wfmspecs.htm
Programming Interface Intel Corporation.
(API)
Communication and
CNR Revision 1.2, http://developer.intel.com/
Network Riser (CNR) November 8, 2001, technology/cnr/index.htm
Specification Intel Corporation.
continued
17
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 3. Specifications (continued)
Reference Specification Version, Revision Date and The information is
Name Title Ownership available from…
DDR Double Data Rate (DDR) Version 2.0, http://www.jedec.org/
SDRAM SDRAM Specification May 2002,
JEDEC Solid State Technology
Association.
Design Specification for
Revision 1.0, http://www.jedec.org/
a 184 Pin DDR
October 2001,
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 1.0, http://developer.intel.com/
Controller Interface March 12, 2002, technology/usb/download/
Specification for Intel Corporation. ehci-r10.pdf
Universal Serial Bus
EPP IEEE Std 1284.1-1997 Version 1.7, 1997, http://standards.ieee.org/
(Enhanced Parallel Port) Institute of Electrical and reading/ieee/std_public/
Electronic Engineers. description/busarch/
1284.1-1997_desc.html
El Torito Bootable CD-ROM Version 1.0, http://www.phoenix.com/en/
Format Specification January 25, 1995, support/download/
Phoenix Technologies Limited product+documentation/
and International Business platform_system_
Machines Corporation. software.htm
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
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.
Plug and Plug and Play BIOS Version 1.0a, http://www.microsoft.com/
Play Specification May 5, 1994, hwdev/tech/PnP/
Compaq Computer Corporation, default.asp
Phoenix Technologies Limited,
and Intel Corporation.
continued
18
Product Description
Table 3. Specifications (continued)
Reference Specification Version, Revision Date The information is
Name Title and Ownership available from…
PXE Preboot Execution Version 2.1, ftp://download.intel.com/
Environment September 20, 1999, labs/manage/wfm/
Intel Corporation. download/pxespec.pdf
SATA Serial ATA: High Speed Revision 1.0, http://www.serialata.com/
Serialized AT August 29, 2001,
Attachment APT Technologies, Inc.,
Dell Computer Corporation,
IBM Corporation,
Intel Corporation,
Maxtor Corporation,
Seagate Technology.
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 2.0, http://www.usb.org/
Specification 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://www.intel.com/labs/
Baseline December 18, 1998, manage/wfm/
Intel Corporation. wfmspecs.htm
19
Intel Desktop Board D845PEBT2 Technical Product Specification
1.5 Processor
NOTE
✏
Refer to Thermal Considerations (Section 2.12, page 83) for important information when using an
Intel Pentium 4 processor operating above 2.80 GHz with this Intel desktop board.
CAUTION
Use of unsupported processors can damage the Desktop Board D845PEBT2, the processor, and
the power supply. See Intel’s World Wide Web site for the most up-to-date list of supported
processors for the Desktop Board D845PEBT2.
The Desktop Board D845PEBT2 supports:
• An Intel Pentium 4 processor in an mPGA478 socket with a system bus of 400/533 MHz
• An Intel Celeron processor in an mPGA478 socket with a system bus of 400 MHz
The list of supported processors for the Desktop Board D845PEBT2 is available from Intel’s
World Wide Web site. All supported onboard memory can be cached. See the processor’s data
sheet for cachability limits.
NOTE
✏
Do not use a standard ATX power supply. The Desktop Board D845PEBT2 will not boot with a
standard ATX power supply. Use only ATX12V-compliant power supplies with the Desktop Board
D845PEBT2. ATX12V power supplies have an additional power lead that provides required
supplemental power for the processor. Connect the 20-pin and 4-pin leads of ATX12V power
supplies to the corresponding connectors on the Desktop Board D845PEBT2 or it will not boot.
For information about Refer to
Supported processors Section 1.2, page 16
Processor data sheets Section 1.2, page 16
Power supply connectors Section 2.8.2.2, page 58
20
Product Description
1.6 System Memory
The Desktop Board D845PEBT2 has two DIMM sockets and supports the following memory
features:
• 2.5 V (only) 184-pin DDR SDRAM DIMMs with gold-plated contacts
• Unbuffered, unregistered single-sided or double-sided DIMMs with the following restriction:
Double-sided DIMMS with x16 organization are not supported.
• 2 GB maximum total system memory with the following clarification:
The Desktop Board has 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
Desktop Board. Please refer to the following Intel web sites for the latest lists of tested
memory.
http://developer.intel.com/design/motherbd/bt2/bt2_mem.htm
• Minimum total system memory: 64 MB
• Non-ECC DIMMs
• Serial Presence Detect
• Suspend to RAM
• 333/266 MHz DDR SDRAM DIMMs
To Use This Type of DIMM… …The Processor's System Bus Frequency Must Be
333 MHz DDR 533 MHz
266 MHz DDR 533 MHz or 400 MHz
✏ NOTES
• Remove the AGP video card before installing or upgrading memory to avoid interference with
the memory retention mechanism.
• To be fully compliant with all applicable DDR SDRAM memory specifications, the Desktop
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.
For information about Refer to
Obtaining DDR SDRAM specifications Section 1.4, page 17
21
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 4 lists the supported DIMM configurations.
Table 4. Supported Memory Configurations
DIMM DDR SDRAM DDR SDRAM Organization Number of DDR
Capacity Configuration 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
128 MB DS 64 Mbit 8 M x 8/8 M x 8 16
128 MB SS 128 Mbit 16 M x 8/empty 8
128 MB SS 256 Mbit 16 M x 16/empty 4
256 MB DS 128 Mbit 16 M x 8/16 M x 8 16
256 MB SS 256 Mbit 32 M x 8/empty 8
256 MB SS 512 Mbit 32 M x 16/empty 4
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16
512 MB SS 512 Mbit 64 M x 8/empty 8
1024 MB DS 512 Mbit 64 M x 8/64 M x 8 16
Note: 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).
22
Product Description
®
1.7 Intel 845PE Chipset
The Intel 845PE chipset consists of the following devices:
• Intel 82845PE Memory Controller Hub (MCH) with Accelerated Hub Architecture (AHA) bus
• Intel 82801DB I/O Controller Hub (ICH4) with AHA bus
• Intel 82802AB (4 Mbit) 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 ICH4 is a centralized controller for the Desktop
Board D845PEBT2’s I/O paths. The FWH provides the nonvolatile storage of the BIOS. The
component combination provides the chipset interfaces as shown in Figure 3.
UDMA 33
Network
ATA-66/100
System Bus USB
845PE Chipset
82845PE 82801DB 82802AB
AHA
Memory Controller I/O Controller Hub 4 Mbit Firmware
Bus
Hub (MCH) (ICH4) Hub (FWH)
LPC Bus
DDR SDRAM
AGP
SMBus PCI Bus AC Link
Interface Bus
OM15029
Figure 3. Intel 845PE Chipset Block Diagram
For information about Refer to
The Intel 845PE chipset http://developer.intel.com
Resources used by the chipset Chapter 2
23
Intel Desktop Board D845PEBT2 Technical Product Specification
1.7.1 AGP
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
NOTES
✏
• The AGP connector is keyed for 1.5 V Switching Voltage Level (SVL) AGP cards only; the
connector is not mechanically compatible with legacy 3.3 V AGP cards. Do not attempt to
install a legacy 3.3 V AGP card.
• Install memory in the DIMM sockets prior to installing the AGP video card to avoid
interference with the memory retention mechanism.
For information about Refer to
The location of the AGP connector Figure 1, page 14
The signal names of the AGP connector Table 38, page 64
Obtaining the Accelerated Graphics Port Interface Specification Section 1.4, page 17
1.7.2 USB
The Desktop Board D845PEBT2 supports up to six USB 2.0 ports, fully supports UHCI and EHCI,
and uses UHCI- and EHCI-compatible drivers.
The ICH4 provides the USB controller for all ports, as shown in Figure 4. The port arrangement is
as follows:
• Two ports are implemented with stacked back panel connectors, adjacent to the PS/2
connectors
• Two ports are implemented with stacked back panel connectors, adjacent to the audio
connectors
• Two ports are routed to the front panel USB connector
Back panel USB connectors
USB USB ports (2)
adjacent to the PS/2 ports
82801DB
Back panel USB connectors
USB USB ports (2)
I/O Controller Hub
adjacent to the audio connectors
(ICH4)
USB USB ports (2) Front panel USB connectors
OM14260
Figure 4. USB Port Configuration
24
Product Description
NOTES
✏
• 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.
• USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not
currently supported by any other operating system.
For information about Refer to
The location of the USB connectors on the back panel Figure 11, page 52
The signal names of the back panel USB connectors Table 18, page 53
The location of the front panel USB connector Figure 15, page 68
The signal names of the front panel USB connector Table 46, page 69
The front panel, EHCI, UHCI, and USB specifications Section 1.4, page 17
1.7.3 IDE Support
1.7.3.1 IDE Interfaces
The ICH4’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 ICH4’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 106.
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 Desktop Board D845PEBT2 supports Laser Servo (LS-120) diskette technology through the
IDE interfaces. The BIOS supports booting from an LS-120 drive.
25
Intel Desktop Board D845PEBT2 Technical Product Specification
✏ NOTE
The BIOS will always recognize an LS-120 drive as an ATAPI floppy drive. To ensure correct
operation, do not configure the drive as a hard disk drive.
For information about Refer to
The location of the IDE connectors Figure 14, page 61
The signal names of the IDE connectors Table 41, page 66
IDE RAID support Section 1.8, page 27
1.7.3.2 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
hard drive 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 hard drive controller. The LED
indicates when data is being read from, or written to, both the add-in hard drive controller and the
IDE controller.
For information about Refer to
The location of the SCSI hard drive activity LED connector Figure 14, page 61
The signal names of the SCSI hard drive activity LED connector Table 42, page 66
1.7.4 Real-Time Clock, CMOS SRAM, and Battery
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.
✏ NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS
RAM at power-on.
®
1.7.5 Intel 82802AB Firmware Hub (FWH)
The 4 Mbit FWH provides the following:
• System BIOS program
• Logic that enables protection for storing and updating of platform information
26
Product Description
1.8 IDE RAID Controller (Optional)
The Promise Technology PDC20267 is a PCI bus-mastering ATA controller for a redundant array
of independent disks (RAID). The controller supports:
• Up to four UDMA 100/66/33 drives or EIDE drives
• 100 MB/sec data transfer with CRC error checking
• RAID 0 (striping)
• RAID 1 (mirroring)
• RAID 0+1 (striping, then mirroring)
• A bootable array
• Hot swapping of failed mirrored drives
Booting from the IDE RAID drives can be enabled in the BIOS Setup’s Boot menu.
For information about Refer to
The location of the IDE RAID connectors Figure 14, page 61
The signal names of the IDE RAID connectors Table 43, page 67
BIOS Setup program’s Boot menu Table 83, page 115
1.9 Serial ATA Controller (Optional)
The Silicon Image SiI 3112a is a PCI-to-Serial ATA (SATA) controller of individual drives or a
RAID configuration. The controller supports:
• Two SATA hard disk drives
• 150 MB/sec data transfer
• RAID 0 (striping)
• RAID 1 (mirroring)
• Booting from an individual drive or set of RAID drives
Booting from an individual drive or RAID set can be enabled or disabled in the BIOS Setup’s
Boot menu.
The SATA drives can be enabled or disabled as a RAID set in the BIOS Setup’s Boot menu. To
use the RAID option, two SATA hard disk drives are required. When RAID is disabled, the drives
are treated as individual SATA drives.
To enable and configure the drives as a RAID set:
• Serial ATA Boot and Serial ATA RAID must both be enabled in the Boot menu in BIOS
Setup.
• Silent Boot must be disabled in the Boot menu in BIOS Setup to provide access to the RAID
Configuration Utility. The utility can then be accessed by pressing the F3 key during POST.
For information about Refer to
The location of the SATA/SATA RAID connectors Figure 14, page 61
The signal names of the SATA/SATA RAID connectors Table 43, page 67
The BIOS Setup program’s Boot menu Table 83, page 115
SATA RAID configuration http://developer.intel.com/design/
motherbd/bt2/index.htm
27
Intel Desktop Board D845PEBT2 Technical Product Specification
1.10 I/O Controller
The SMSC LPC47M172 I/O controller provides the following features:
• One serial port
• 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
The BIOS Setup program provides configuration options for the I/O controller.
For information about Refer to
SMSC LPC47M172 I/O controller http://www.smsc.com
1.10.1 Serial Ports
The Desktop Board D845PEBT2 has one serial port connector located on the back panel. The
serial port supports data transfers at speeds up to 115.2 kbits/sec with BIOS support.
For information about Refer to
The location of the serial port connector Figure 11, page 52
The signal names of the serial port connector Table 19, page 53
1.10.2 Parallel Port
The 25-pin D-Sub parallel port connector is located on the back panel. Use the BIOS Setup
program to set the parallel port mode.
For information about Refer to
The location of the parallel port connector Figure 11, page 52
The signal names of the parallel port connector Table 20, page 54
Setting the parallel port’s mode Table 71, page 103
1.10.3 Diskette Drive Controller
The I/O controller supports one diskette drive. Use the BIOS Setup program to configure the
diskette drive interface.
For information about Refer to
The location of the diskette drive connector Figure 14, page 61
The signal names of the diskette drive connector Table 40, page 65
The supported diskette drive capacities and sizes Table 74, page 107
28
Product Description
1.10.4 Keyboard and Mouse Interface
The PS/2 keyboard and mouse connectors are located on the back panel.
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.
For information about Refer to
The location of the keyboard and mouse connectors Figure 11, page 52
The signal names of the keyboard and mouse connectors Table 16, page 53
1.11 IEEE 1394a-2000 Controller (Optional)
The Agere Systems FW323 PCI bus-based controller provides IEEE 1394a-2000 OHCI link and
PHY core functionality. The controller supports:
• IEEE 1394a-2000-compliant or IEEE 1394-1995-compliant peripheral devices
• Isochronous and asynchronous data transfer
• Data transfer up to 400 Mbits/sec
• Peripheral hot swapping
• Plug and play
The Desktop Board D845PEBT2 has one back panel and two front panel IEEE 1394a-2000
connectors.
NOTE
✏
IEEE 1394a-2000 support has been tested with Windows 2000 and Windows XP drivers and is not
currently supported by any other operating system.
For information about Refer to
The location of the back panel IEEE 1394a-2000 connector Figure 11, page 52
The signal names of the back panel IEEE 1394a-2000 connector Table 17, page 53
The location of the front panel IEEE 1394a-2000 connectors Figure 15, page 68
The signal names of the front panel IEEE 1394a-2000 connectors Table 47, page 69
Obtaining IEEE standards:
• 1394-1995, IEEE Standard for a High Performance Serial Bus
• 1394a-2000, IEEE Standard for a High Performance Serial Bus – Amendment 1 Table 3, page 17
29
Intel Desktop Board D845PEBT2 Technical Product Specification
1.12 Audio Subsystem
The Desktop Board D845PEBT2 includes one of the following:
• 6-channel audio subsystem based on the Analog Devices AD1980 codec (described on
page 30)
• 2-channel audio subsystem based on the Analog Devices AD1981B codec (described on
page 31)
Both audio subsystems feature:
• Split digital/analog architecture for improved S/N (signal-to-noise) ratio: > 94 dB
• Power management support for ACPI 2.0 (driver dependent)
1.12.1 6-Channel Audio Subsystem (Optional)
The audio subsystem includes the following:
• Intel 82801DB I/O Controller Hub (ICH4)
• Analog Devices AD1980 audio codec
• Microphone input that supports either of the following:
A single dynamic, condenser, or electret microphone
Dual microphones for use with voice recognition software
The subsystem includes the following connectors. Powered speakers are required.
• Front panel analog audio connector that can be used as a connector for routing the following
signals to the front panel or used as a jumper block for routing the signals to the back panel
(see page 72 for more information). The connector/jumper block includes pins for:
Front left and right out
Mic in
• Back panel analog audio connectors:
Front left and right out
Center and Low Frequency Effects (LFE) out
Rear left and right out
Line in
Mic in
• Back panel digital S/PDIF (RCA) connector
• Back panel optical S/PDIF (Toslink) connector
• ATAPI-style CD-ROM connector
NOTE
✏
Powered speakers are required.
30
Product Description
Figure 6 is a block diagram of the 6-channel audio subsystem.
Front Left and Right Out
Center and LFE Out
Rear Left and Right Out
82801DB
AC ’97
I/O Controller Hub Digital S/PDIF
AD1980
Link
(ICH4)
Optical S/PDIF
Audio Codec
Line In
Mic In
CD-ROM
OM15030
Figure 5. 6-Channel Audio Subsystem Block Diagram
For information about Refer to
The front panel audio connector Section 2.8.3, page 68
The back panel audio connectors Section 2.8.1, page 52
1.12.2 2-Channel Audio Subsystem (Optional)
The audio subsystem includes the following:
• Intel 82801DB I/O Controller Hub (ICH4)
• Analog Devices AD1981B audio codec
• Microphone input that supports a single dynamic, condenser, or electret microphone
The subsystem has the following connectors:
• Front panel audio connector, including pins for:
Line out
Mic in
• Back panel audio connectors:
Line out
Line in
Mic in
• ATAPI-style CD-ROM connector
31
Intel Desktop Board D845PEBT2 Technical Product Specification
Figure 6 is a block diagram of the 2-channel audio subsystem.
Line In
82801DB
Line Out
AC ’97 AD1981B
I/O Controller Hub
Link Audio Codec
Mic In
(ICH4)
CD-ROM
OM15031
Figure 6. 2-Channel Audio Subsystem Block Diagram
For information about Refer to
Upgrading the onboard audio subsystem using a CNR audio card Section 1.14, page 35
The front panel audio connector Section 2.8.3, page 68
The back panel audio connectors Section 2.8.1, page 52
1.12.3 Audio Connectors
1.12.3.1 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 68
The signal names of the front panel audio connector Table 45, page 69
Obtaining the Front Panel I/O Connectivity Design Guide Section 1.4, page 17
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 72 for more information.
1.12.3.2 ATAPI-Style CD-ROM Connector
A 1 x 4-pin connector connects an internal ATAPI CD-ROM drive to the audio mixer.
For information about Refer to
The location of the ATAPI-style CD-ROM connector Figure 14, page 61
The signal names of the ATAPI-style CD-ROM connector Table 39, page 65
1.12.4 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 1.2, page 16
32
Product Description
1.13 LAN Subsystem
The network interface controller subsystem consists of the ICH4 with integrated LAN Media
Access Controller (MAC) 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 Mbits/sec Ethernet)
• PCI power management
Supports ACPI technology
Supports LAN wake capabilities
®
1.13.1 Intel 82562ET Physical Layer Interface Device
The Intel 82562ET component provides an interface to the back panel RJ-45 connector with
integrated LEDs.
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
1.13.2 RJ-45 LAN Connector with Integrated LEDs
Two LEDs are built into the RJ-45 LAN connector (shown in Figure 7 below).
Green LED Yellow LED
OM15076
Figure 7. LAN Connector LED Locations
Table 5 describes the LED states when the Desktop Board is powered up and the LAN subsystem
is operating.
Table 5. LAN Connector LED States
LED Color LED State Condition
Green Off 10 Mbits/sec data rate is selected.
On 100 Mbits/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.
33
Intel Desktop Board D845PEBT2 Technical Product Specification
1.13.3 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 1.2, page 16
1.14 CNR (Optional)
The Communication and Networking Riser (CNR) supports:
• AC ’97 interface: Supports audio and/or modem functions on the CNR card.
• SMBus interface: Provides Plug-and-Play functionality for the CNR card.
The CNR connector includes power signals required for power management and for CNR card
operation.
NOTE
✏
The Desktop Board D845PEBT2 does not support USB and LAN functionality on CNR cards.
Figure 8 shows the signal interface between the ICH4 and the CNR.
AC ’97 Interface
Communication and
Intel 82801DB
Networking Riser
I/O Controller Hub
(ICH4)
(Up to two AC ’97 codecs)
SMBus
OM14466
Figure 8. ICH4 and CNR Signal Interface
For information about Refer to
CNR specification Section 1.4, page 17
34
CNR Connector
Product Description
The optional 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/PDIF digital
connections.
NOTES
✏
• For an audio multi-channel upgrade, you must install an audio CNR card that is compatible
with the onboard codec.
• If you install an audio CNR card that does not provide a multi-channel upgrade, the integrated
audio codec on the Desktop Board D845PEBT2 will be disabled.
• Check with your CNR vendor to ensure that the CNR card has been tested with ICH4-based
systems.
For information about Refer to
CNR audio upgrade cards http://developer.intel.com/technology/cnr/
1.15 Hardware Management Subsystem
The hardware management features enable the Desktop Board D845PEBT2 to be compatible with
the Wired for Management (WfM) specification. The Desktop Board D845PEBT2 has the
following hardware management features:
• Fan monitoring and control (through the I/O controller or the hardware monitoring and fan
control ASIC)
• Thermal and voltage monitoring
• Chassis intrusion detection
For information about Refer to
The WfM specification Section 1.4, page 17
1.15.1.1 Hardware Monitoring and Fan Control ASIC
The features of the hardware monitoring and fan control ASIC (Standard Microsystems
SMSC EMC6D101 or equivalent) include:
• Internal ambient temperature sensor
• Two remote thermal diode sensors for direct monitoring of processor temperature and ambient
temperature sensing
• Power supply monitoring of five voltages (+5 V, +12 V, +3.3 V Standby, +1.5 V, and +VCCP)
to detect levels above or below acceptable values
• Thermally monitored closed-loop fan control, for all three fans, that can adjust the fan speed or
switch the fans on or off as needed
• SMBus interface
For information about Refer to
The location of the fan connectors and sensors for thermal monitoring Figure 9, page 36
The Standard Microsystems SMSC EMC6D101 http://www.smsc.com
35
Intel Desktop Board D845PEBT2 Technical Product Specification
1.15.1.2 Thermal Monitoring
Figure 9 shows the location of the sensors and fan connectors.
A
B
C
D
E
F
OM15032
A Thermal diode, located on processor die
B Remote ambient temperature sensor
C Ambient temperature sensor, internal to
hardware monitoring ASIC
D Processor fan
E Rear chassis fan
F Front chassis fan
Figure 9. Thermal Monitoring
1.15.2 Fan Monitoring
® ® ®
Fan monitoring can be implemented using Intel Active Monitor, Intel LANDesk Client
Manager, or third-party software.
For information about Refer to
The functions of the fan connectors Section 1.16.2.2, page 41
36
Product Description
1.15.3 Chassis Intrusion and Detection
The boards support a chassis security feature that detects if the chassis cover has been removed.
The security feature uses a mechanical switch on the chassis that attaches to the chassis intrusion
connector. When the chassis cover is removed, the mechanical switch is in the closed position.
For information about Refer to
The location of the chassis intrusion connector Figure 13, page 58
The signal names of the chassis intrusion connector Table 34, page 60
1.16 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
37
Intel Desktop Board D845PEBT2 Technical Product Specification
1.16.1 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 Desktop Board D845PEBT2 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 standby or sleeping state
• A Soft-off feature that enables the operating system to power-off the computer
• Support for multiple wake-up events (see Table 8 on page 40)
• Support for a front panel power and sleep mode switch
Table 6 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 6. 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 S5 – Soft off) (ACPI S0 – working state)
On Less than four seconds Soft-off/Standby
(ACPI S0 – working state) (ACPI S1 or S3 – sleeping state)
On More than four seconds Fail safe power-off
(ACPI S0 – working state) (ACPI S5 – Soft off)
Sleep Less than four seconds Wake-up
(ACPI S1 or S3 – sleeping state) (ACPI S0 – working state)
Sleep More than four seconds Power-off
(ACPI S1 or S3 – sleeping state) (ACPI S5 – Soft off)
For information about Refer to
The Desktop Board D845PEBT2's compliance level with ACPI Section 1.4, page 17
38
Product Description
1.16.1.1 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 7 lists the power states supported by the Desktop Board D845PEBT2 along with the
associated system power targets. See the ACPI specification for a complete description of the
various system and power states.
Table 7. 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/G5 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.
39
Intel Desktop Board D845PEBT2 Technical Product Specification
1.16.1.2 Wake-up Devices and Events
Table 8 lists the devices or specific events that can wake the computer from specific states.
Table 8. Wake-up Devices and Events
These devices/events can wake up the computer… …from this state
CNR S1, S3, S4, S5
(Note)
LAN S1, S3, S4, S5
Modem (back panel Serial Port A) S1, S3
(Note)
PME# S1, S3, S4, S5
Power switch S1, S3, S4, S5
PS/2 devices S1, S3
RTC alarm S1, S3, S4, S5
USB S1, S3
Note: 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.
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.
1.16.2 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 80 for additional information.
The Desktop Board D845PEBT2 provides 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.
40
Product Description
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.
1.16.2.1 Power Connector
ATX12V-compliant power supplies can turn off the system power through system control. When
an ACPI-enabled system receives the correct command, the power supply removes all non-standby
voltages.
When resuming from an AC power failure, 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 Last Power State
feature in the BIOS Setup program’s Boot menu.
For information about Refer to
The power connector locations Figure 13, page 58
The power connector signal names Table 30, page 59 and Table 33, page 60
The BIOS Setup program’s Boot menu Table 83, page 115
The ATX specification Section 1.4, page 17
1.16.2.2 Fan Connectors
CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan
connector. Connecting the processor fan to a chassis fan connector may result in onboard
component damage that will halt fan operation.
Table 9 summarizes the fan connector function/operation.
Table 9. 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 hardware monitoring and fan control ASIC.
• Closed-loop fan control that can adjust the fan speed or switch the fan on or off as
needed.
Front and rear • +12 V DC connection for a system or chassis fan.
chassis fans
• 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 hardware monitoring and fan control ASIC.
• Closed-loop fan control that can adjust the fan speed or switch the fan on or off as
needed.
For information about: Refer to:
The location of the fan connectors Figure 13, page 58
The signal names of the fan connectors Pages 59 and 60
The location of the fan connectors and sensors for thermal monitoring Figure 9, page 36
41
Intel Desktop Board D845PEBT2 Technical Product Specification
1.16.2.3 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 80 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 Desktop Board D845PEBT2
supports LAN wake capabilities with ACPI in the following ways:
• PCI bus PME# signal for PCI 2.2 compliant LAN designs
• Onboard LAN subsystem
1.16.2.4 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 80 for additional information.
Instantly Available PC technology enables the Desktop Board D845PEBT2 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 8 on page 40 lists the devices and events that can wake the computer from the
S3 state.
The Desktop Board D845PEBT2 supports the PCI Bus Power Management Interface
Specification. For information on the version of this specification, see Section 1.4. 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.
42
Product Description
1.16.2.5 Standby Power (+5 V) 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 Desktop Board D845PEBT2.
Failure to do so could damage the Desktop Board D845PEBT2 and any attached devices.
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.
CR3H1
OM15048
Figure 10. Location of the Standby Power Indicator LED
1.16.2.6 Resume on Ring
The operation of Resume on Ring can be summarized as follows:
• Resumes operation from ACPI S1 or S3 states
• Detects incoming call similarly for external and internal modems
• Requires modem interrupt be unmasked for correct operation
1.16.2.7 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.
43
Intel Desktop Board D845PEBT2 Technical Product Specification
1.16.2.8 Wake from PS/2 Devices
PS/2 device activity wakes the computer from an ACPI S1 or S3 state.
1.16.2.9 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).
44
2 Technical Reference
What This Chapter Contains
2.1 Introduction.................................................................................................................45
2.2 Memory Map ..............................................................................................................45
2.3 Fixed I/O Map.............................................................................................................46
2.4 DMA Channels ...........................................................................................................47
2.5 PCI Configuration Space Map ....................................................................................47
2.6 Interrupts ....................................................................................................................48
2.7 PCI Interrupt Routing Map..........................................................................................49
2.8 Connectors.................................................................................................................51
2.9 Jumper Blocks............................................................................................................72
2.10 Mechanical Considerations.........................................................................................74
2.11 Electrical Considerations ............................................................................................79
2.12 Thermal Considerations..............................................................................................83
2.13 Reliability ....................................................................................................................85
2.14 Environmental ............................................................................................................85
2.15 Regulatory Compliance ..............................................................................................86
2.1 Introduction
Sections 2.2 - 2.6 contain several standalone tables. Table 10 describes the system memory map,
Table 11 shows the fixed I/O map, Table 12 lists the DMA channels, Table 13 defines the PCI
configuration space map, and Table 14 describes the interrupts. The remaining sections in this
chapter are introduced by text found with their respective section headings.
2.2 Memory Map
Table 10. 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
45
Intel Desktop Board D845PEBT2 Technical Product Specification
2.3 Fixed I/O Map
Table 11. I/O Map
Address (hex) Size Description
0000 - 00FF 256 bytes Used by the Desktop Board D845PEBT2. Refer to the
ICH4 data sheet for dynamic addressing information
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 82845PE MCH
03C0 - 03DF 32 bytes Intel 82845PE 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
Notes:
1. Default, but can be changed to another address range
2. Dword access only
3. Byte access only
For information about Refer to
ICH4 addressing Section 1.2, page 16
46
Technical Reference
2.4 DMA Channels
Table 12. 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 13. PCI Configuration Space Map
Bus Device Function
Number (hex) Number (hex) Number (hex) Description
00 00 00 Memory controller of Intel 82845PE component
00 01 00 Host to AGP bridge (virtual P2P)
00 1E 00 Hub link to PCI bridge
00 1F 00 Intel 82801DB ICH4 PCI-to-LPC bridge
00 1F 01 IDE controller
00 1F 03 SMBus controller
00 1F 05 AC ’97 audio controller
00 1F 06 AC ’97 modem controller (optional)
00 1D 00 USB UHCI controller 1
00 1D 01 USB UHCI controller 2
00 1D 02 USB UHCI controller 3
00 1D 07 EHCI controller
01 00 00 AGP add-in card
02 08 00 LAN controller
02 00 00 PCI bus connector 1
02 01 00 PCI bus connector 2
02 02 00 PCI bus connector 3
02 03 00 PCI bus connector 4
02 04 00 PCI bus connector 5
02 06 00 SATA/SATA RAID or IDE RAID controller
02 07 00 IEEE 1394a-2000 controller (optional)
47
Intel Desktop Board D845PEBT2 Technical Product Specification
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 ICH4 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 14. 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 ICH4 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 USB UHCI controller 1 (through PIRQA)
(Note 2)
17 AC ’97 audio/modem/User available (through PIRQB)
(Note 2)
18 ICH4 USB controller 3 (through PIRQC)
(Note 2)
19 ICH4 USB controller 2 (through PIRQD)
(Note 2)
20 ICH4 LAN (through PIRQE)
(Note 2)
21 User available (through PIRQF)
(Note 2)
22 User available (through PIRQG)
(Note 2)
23 ICH4 USB 2.0 EHCI controller/User available (through PIRQH)
Notes:
1. Default, but can be changed to another IRQ.
2. Available in APIC mode only.
48
Technical Reference
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 ICH4 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 Desktop Board D845PEBT2 and therefore
share the same interrupt. Table 15 shows an example of how the PIRQ signals are routed.
For example, using Table 15 as a reference, assume an add-in card using INTA is plugged into PCI
bus connector 3. In PCI bus connector 3, INTA is connected to PIRQC, which is already
connected to the ICH4 USB. The add-in card in PCI bus connector 3 now shares an interrupt with
the onboard interrupt source.
49
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 15. PCI Interrupt Routing Map
ICH4 PIRQ Signal Name
PCI Interrupt Source
PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH
AGP connector INTA INTB
ICH4 USB UHCI controller 1 INTA
SMBus controller INTB
ICH4 USB UHCI controller 2 INTB
AC ’97 ICH4 Audio/Modem INTB
ICH4 LAN INTA
ICH4 USB UHCI controller 3 INTC
ICH4 USB 2.0 EHCI INTD
controller
PCI bus connector 1 INTD INTA INTB INTC
PCI bus connector 2 INTC INTB INTA INTD
PCI bus connector 3 INTD INTC INTA INTB
PCI bus connector 4 INTB INTA INTC INTD
PCI bus connector 5 INTC INTA INTD INTB
SATA/SATA RAID or INTA
IDE RAID controller
IEEE 1394a-2000 controller INTA
(optional)
NOTE
✏
In PIC mode, the ICH4 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 14 for the
allocation of PIRQ lines to IRQ signals in APIC mode.
50
Technical Reference
2.8 Connectors
CAUTION
On the Desktop Board D845PEBT2, only the following connectors have overcurrent protection:
• Back panel USB, IEEE 1394a-2000, and PS/2
• Front panel USB and IEEE 1394a-2000
The other internal connectors of the Desktop Board D845PEBT2 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.
The connectors are described on the following pages and are divided into these groups:
• Back panel I/O connectors (see page 52):
PS/2 keyboard and mouse
IEEE 1394a-2000 (optional)
USB
Parallel port
Serial port A
Digital S/PDIF (optional)
Optical S/PDIF (optional)
Audio
LAN
• Internal I/O connectors (see page 56):
ATAPI-style CD-ROM
Fans
Power
PCI add-in boards
AGP add-in board
IDE
Diskette drive
SCSI LED
SATA/SATA RAID (optional)
IDE RAID (optional)
CNR (optional)
• External I/O connectors (see page 68):
Front panel audio
Front panel IEEE 1394a-2000 (optional)
Front panel USB
Front panel (power, sleep, and message-waiting LED; power switch; hard drive activity
LED; and reset switch)
Auxiliary front panel power, sleep, and message-waiting LED
51
Intel Desktop Board D845PEBT2 Technical Product Specification
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.
K
F N
I
A C
B D E G H J L M O
OM14842
For more
Item Description Color information see:
A PS/2 mouse port Green Table 16
B PS/2 keyboard port Purple Table 16
C IEEE 1394a-2000 port (optional) Black Table 17
D USB ports Black Table 18
E Serial port A Teal Table 19
F Parallel port Burgundy Table 20
G Digital S/PDIF (optional) Orange Table 21
H Optical S/PDIF (optional) Black Table 22
I Audio rear left and right out (for 6-channel audio only) Black Table 23
J Audio center and LFE out (for 6-channel audio only) Black Table 24
K Audio line in Light blue Table 25
L Front left and right out (for 6-channel audio); Lime green Table 26
Audio line out (for 2-channel audio)
M Mic in Pink Table 27
N LAN Black Table 28
O USB ports Black Table 18
Figure 11. Back Panel Connectors
NOTE
✏
The back panel audio line out connector is designed for headphones or amplified speakers only.
Poor audio quality occurs if passive (non-amplified) speakers are connected to this output.
52
Technical Reference
Table 16. 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 17. IEEE 1394a-2000 Connector (Optional)
Pin Signal Name
1 +12V (Fused)
2 Ground
3 TPB1-
4 TPB1+
5 TPA1-
6 TPA1+
7 - 14 Shield Ground
Table 18. USB Connectors
Pin Signal Name
1 +5 V (Fused)
2 USB#
3 USB
4 Ground
Table 19. 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)
53
Intel Desktop Board D845PEBT2 Technical Product Specification
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
Table 21. Digital S/PDIF Connector (Optional)
Pin Signal Name
Tip S/PDIF
Sleeve Ground
Table 22. Optical S/PDIF Connector (Optional)
Location Signal Name
Tunnel S/PDIF
Table 23. Audio Rear Left and Right Out Connector (Optional)
Pin Signal Name
Tip Rear left out
Ring Rear right out
Sleeve Ground
Table 24. Audio Center and LFE Out Connector (Optional)
Pin Signal Name
Tip Center out
Ring LFE out
Sleeve Ground
54
Technical Reference
Table 25. Audio Line In Connector
Pin Signal Name
Tip Audio left in
Ring Audio right in
Sleeve Ground
Table 26. Audio Line Out Connector
(Front Left and Right Out for 6-Channel Audio)
Pin Signal Name
Tip Audio left out
Ring Audio right out
Sleeve Ground
Table 27. Mic In Connector
Pin Signal Name
Tip Mono in
Ring Mic bias voltage
Sleeve Ground
Table 28. LAN Connector
Pin Signal Name
1 TX+
2 TX-
3 RX+
4 Ground
5 Ground
6 RX-
7 Ground
8 Ground
55
Intel Desktop Board D845PEBT2 Technical Product Specification
2.8.2 Internal I/O Connectors
The internal I/O connectors are divided into the following functional groups:
• Power and hardware control (see page 58):
Fans [three]
ATX12V
Main power
Chassis intrusion
• Add-in boards and peripheral interfaces (see page 61):
PCI bus
AGP
IDE [two]
IDE RAID [two] (optional)
SATA/SATA RAID [two] (optional)
Diskette drive
SCSI LED
ATAPI-style CD-ROM
CNR (optional)
56
Technical Reference
2.8.2.1 Expansion Slots
The Desktop Board D845PEBT2 has the following expansion slots:
• 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.
• CNR (optional).
• Five PCI rev 2.2 compliant local bus slots: PCI add-in cards with SMBus support can access
sensor data and other information residing on the Desktop Board D845PEBT2. As shown in
the table below, the PCI bus connector to which SMBus is routed varies per board version.
The board version can be identified by the board’s AA number (labeled on the board’s front
right corner and shown in the figure at the bottom of the page) or by the manufacturing options
included on the board (listed in the table below).
Table 29. SMBus Routing
A Board with This AA Number Or These Included Manufacturing Has SMBus Routed to This PCI
(where xxx is any number) Options Bus Connector
A99697-xxx 2-channel audio subsystem 1 (ATX expansion slot 6)
C10867-xxx • 6-channel audio subsystem 1 (ATX expansion slot 6)
• IEEE 1394a-2000 subsystem
C12587-xxx • 6-channel audio subsystem 2 (ATX expansion slot 5)
• (No IEEE 1394a-2000
subsystem)
NOTE
✏
This document references back-panel slot numbering with respect to processor location on the
Desktop Board D845PEBT2. The AGP slot is not numbered. PCI slots are identified as PCI slot
#x, starting with the slot closest to the processor. The ATX specification identifies expansion slot
locations with respect to the far edge of a full-sized ATX chassis. The ATX specification and the
Desktop Board D845PEBT2’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 61 illustrates the Desktop Board D845PEBT2’s PCI
slot numbering.
The following figure shows the location of the board’s AA number.
OM15049
Figure 12. Location of the Board’s AA Number
57
Intel Desktop Board D845PEBT2 Technical Product Specification
2.8.2.2 Power and Hardware Control Connectors
CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan
connector. Connecting the processor fan to a chassis fan connector may result in onboard
component damage that will halt fan operation.
Figure 13 shows the location of the power and hardware control connectors.
A
1
B
4
2
1
3
1
C
1
20 11
1 1 D
10
F E
OM15033
For more
Item Description information see:
A +12 V power connector (ATX12V) Table 30
B Rear chassis fan Table 31
C Processor fan Table 32
D Main power Table 33
E Chassis intrusion Table 34
F Front chassis fan Table 35
Figure 13. Power and Hardware Control Connectors
58
Technical Reference
NOTE
✏
Do not use a standard ATX power supply. The Desktop Board D845PEBT2 will not boot with a
standard ATX power supply. Use only ATX12V-compliant power supplies with the Desktop Board
D845PEBT2. ATX12V power supplies have an additional power lead that provides required
supplemental power for the Intel Pentium 4 processor. The Desktop Board D845PEBT2 will not
boot if the ATX12V power supply is not connected to both the 4-pin and 20-pin power connectors.
For information about Refer to
The power connector Section 1.16.2.1, page 41
The functions of the fan connectors Section 1.16.2.2, page 41
Table 30. ATX12V Power Connector
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12 V 4 +12 V
Table 31. Rear Chassis Fan Connector
Pin Signal Name
1 Control
2 VREG_12V_POWER
3 REAR_FAN_TACH
Table 32. Processor Fan Connector
Pin Signal Name
1 Control
2 +12 V
3 CPU_FAN_TACH
59
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 33. 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 Not connected
9 +5 V (Standby) 19 +5 V
10 +12 V 20 +5 V
Table 34. Chassis Intrusion Connector
Pin Signal Name
1 Intruder
2 Ground
Table 35. Front Chassis Fan Connector
Pin Signal Name
1 Control
2 +12 V
3 FRONT_FAN_TACH
60
Technical Reference
2.8.2.3 Add-in Board and Peripheral Interface Connectors
Figure 14 shows the location of the add-in board and peripheral connectors for the Desktop Board
D845PEBT2. Note the following considerations for the PCI bus connectors:
• All of the PCI bus connectors are bus master capable.
• The SMBus is routed to PCI bus connector 1 or 2 depending on the board’s AA number labeled
on the board’s front right corner (see section 2.8.2.1 on page 57). This enables PCI bus add-in
boards with SMBus support to access sensor data on the Desktop Board D845PEBT2. 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
1
4
7 1
2 40
1
1 7 39
2 40
39 1
1 39
2
40 1
2 34
1
39
1 33
40 2
P O N M L K J I
OM15034
For more For more
information information
Item Description see: Item Description see:
A CNR (optional) Table 36 I Secondary IDE [white] Table 41
B PCI bus connector 5 Table 37 J Primary IDE [black] Table 41
C PCI bus connector 4 Table 39 K Diskette drive Table 40
D ATAPI-style CD-ROM Table 37 L SCSI LED Table 42
E PCI bus connector 3 Table 37 M Secondary IDE RAID [blue] Table 43
(optional)
F PCI bus connector 2 Table 37 N Primary IDE RAID [blue] Table 43
(optional)
G PCI bus connector 1 Table 37 O Primary SATA/SATA RAID Table 44
(optional)
H AGP Table 38 P Secondary SATA/SATA RAID Table 44
(optional)
Figure 14. D845PEBT2 Add-in Board and Peripheral Interface Connectors
61
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 36. 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 Not connected B7 Ground
A8 Not connected B8 Not connected
A9 Ground B9 Not connected
A10 Not connected B10 Ground
A11 Not connected B11 Not connected
A12 Reserved B12 Not connected
A13 Not connected B13 Ground
A14 Ground B14 Reserved
A15 Not connected B15 +5 V (dual)
A16 +12 V B16 Not connected
A17 Ground B17 Ground
A18 +3.3 V (dual) B18 -12 V
A19 +5 V B19 +3.3 V
A20 Ground B20 Ground
A21 Not connected B21 Not connected
A22 Not connected B22 Not connected
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 AC97_SDATA_IN2 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
CNR Section 1.14, page 34
62
Technical Reference
Table 37. 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 or 2 (see section 2.8.2.1 on page 57), this pin is connected to the SMBus clock line.
*** On PCI bus connector 1 or 2 (see section 2.8.2.1 on page 57), this pin is connected to the SMBus data line.
63
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 38. 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.
64
Technical Reference
Table 39. ATAPI-Style 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
Table 40. 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)
65
Intel Desktop Board D845PEBT2 Technical Product Specification
Table 41. 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 42. SCSI LED Connector
Pin Signal Name
1 SCSI_ACT#
2 No connect
66
Technical Reference
Table 43. IDE RAID Connectors (Optional)
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 DMARQ 22 Ground
23 I/O Write# 24 Ground
25 I/O Read# 26 Ground
27 IORDY 28 Ground
29 DMACK 30 Ground
31 INTRQ 32 Not connected
33 A1 (Address 1) 34 PDIAG [SDIAG]
35 A0 (Address 0) 36 A2 (Address 2)
37 Chip Select 0P [Chip Select 0S] 38 Chip Select 1P [Chip Select 1S]
39 Activity# 40 Ground
Signal names in brackets [ ] are for the secondary IDE RAID connector.
Table 44. SATA/SATA RAID Connectors (Optional)
Pin Signal Name
1 Ground
2 TXP
3 TXN
4 Ground
5 RXN
6 RXP
7 Ground
67
Intel Desktop Board D845PEBT2 Technical Product Specification
2.8.3 External I/O Connectors
Figure 15 shows the locations of the external I/O connectors.
A
1
2
9
10
1 2
7
10
1 2
7
10
1
2
7
10
9
8
1
2
1
1
E D C B
OM15035
Item Description For more information see:
A Front panel audio Table 45
B Auxiliary front panel power/sleep/message-waiting LED Table 51
C Front panel USB [black] Table 46
D Front panel Table 48
E Front panel IEEE 1394a-2000 [white] (optional) Table 47
Figure 15. External I/O Connectors
68
Technical Reference
Table 45. 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 Not connected 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.
For more information, see Section 2.9.1 on page 72.
Table 46. 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
Table 47. Front Panel IEEE 1394a-2000 Connectors (Optional)
Pin Signal Name
1 TPA1+ [TPA2+]
2 TPA1- [TPA2-]
3 Ground
4 Ground
5 TPB1+ [TPB2+]
6 TPB1- [TPB2-]
7 +12 V (Fused)
8 +12 V (Fused)
9 Key
10 Ground
Signal names in brackets [ ] are for the second IEEE 1394a-2000 connector.
69
Intel Desktop Board D845PEBT2 Technical Product Specification
2.8.3.1 Front Panel Connector
This section describes the functions of the front panel connector. Table 48 lists the signal names
of the front panel connector.
Table 48. 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 pull-up 2 HDR_BLNK_ Out Front panel green
(330 Ω) to +5 V GRN LED
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
Power Not Connected
9 +5 V Power 10 N/C Not connected
N/C +5 V DC
9
8 7
Reset
Power
Switch
Switch
6 5
4 3
Hard Drive
Power
Activity LED
LED
2 1
OM15075
Figure 16. Front Panel Connector Pins
2.8.3.1.1 SCSI 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. Proper LED function requires one of the following:
• An SATA hard drive connected to an onboard SATA connector
• An IDE hard drive connected to an onboard IDE connector
• A add-in hard drive connected to the SCSI hard drive activity LED connector
For information about Refer to
The SCSI hard drive activity LED connector Section 1.7.3.2, page 26
70
Technical Reference
2.8.3.1.2 Reset Switch Connector
Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type switch that is
normally open. When the switch is closed, the Desktop Board D845PEBT2 resets and runs
the POST.
2.8.3.1.3 Power/Sleep/Message Waiting LED Connector
Pins 2 and 4 can be connected to a one- or two-color LED. Table 49 shows the possible states for
a one-color LED. Table 50 shows the possible states for a two-color LED.
Table 49. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Green Running
Blinking Green Running/message waiting
Table 50. 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.
2.8.3.1.4 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 Desktop Board D845PEBT2.)
At least two seconds must pass before the power supply will recognize another on/off signal.
2.8.3.2 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 51. 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
71
Intel Desktop Board D845PEBT2 Technical Product Specification
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 Desktop Board
D845PEBT2 could be damaged.
Figure 17 shows the location of the jumper blocks on the Desktop Board D845PEBT2.
1
3
5
A
7
9
3 1
B
OM14846
Item Description Reference Designator
A Front panel audio connector/jumper block J9B1
B BIOS Setup configuration jumper block J6H2
Figure 17. Location of the Jumper Blocks
2.9.1 Front Panel Audio Connector/Jumper Block
CAUTION
Do not place jumpers on this block in any configuration other than the one described in Table 52.
Other jumper configurations are not supported and could damage the Desktop Board D845PEBT2.
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.
72
Technical Reference
Table 52 describes the two configurations of this connector/jumper block.
Table 52. Front Panel Audio Connector or Jumper Block
Jumper Setting Configuration
Front out signals if 6-channel audio (line out signals if 2-channel audio)
1 2
are routed to the back panel line out connector. The back panel audio line
34
out connector is shown in Figure 11 on page 52.
5 6
5 and 6
7
10
9
9 and 10
Mic in and front out signals if 6-channel audio (line out signals if 2-channel
1 2
No jumpers audio) are available for connection to front panel audio connectors. Table
34
installed 45 on page 69 lists the names of the signals available on this connector
5 6
when no jumpers are installed.
7
10
9
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 53 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 53. 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 97
The maintenance menu of the BIOS Setup program Section 4, page 97
BIOS recovery Section 3.7, page 92
73
Intel Desktop Board D845PEBT2 Technical Product Specification
2.10 Mechanical Considerations
2.10.1 D845PEBT2 Form Factor
The Desktop Board D845PEBT2 is designed to fit into an ATX-form-factor chassis. The board
dimensions depend on the board version, as shown in the table below. The location of the board’s
AA number is shown in the Figure 12 on page 57.
Table 54. Board Dimensions
A Board with
This AA Number
(where xxx is Or These Included Manufacturing Has These Board Dimensions
any number) Options in Inches [Millimeters] As Shown in
A99697-xxx 2-channel audio subsystem 12" x 8.2"
[304.80 mm x 208.28 mm] Figure 18
C10867-xxx • 6-channel audio subsystem 12" x 8.5"
[304.80 mm x 215.90 mm] Figure 19
• IEEE 1394a-2000 subsystem
C12587-xxx • 6-channel audio subsystem 12" x 8.5"
[304.80 mm x 215.90 mm] Figure 19
• (No IEEE 1394a-2000
subsystem)
In the figures, dimensions are given in inches [millimeters]. Location of the I/O connectors and
mounting holes are in compliance with the ATX specification (see Section 1.4).
6.50
[165.10]
6.10
[154.94]
5.20
[132.08]
0.00
1.70
[43.18]
6.45
0.00
5.55
[163.83]
[140.97] 6.20
4.90 2.60
[157.48]
[124.46] [66.04]
1.80
[45.72]
OM15036
Figure 18. 12" x 8.2" Desktop Board Dimensions
74
Technical Reference
6.50
[165.10]
6.10
[154.94]
5.20
[132.08]
0.00
2.00
[50.80]
6.45
0.00
5.55
[163.83]
[140.97] 4.90 2.60 6.20
[124.46] [66.04] [157.48]
1.80
[45.72]
OM15077
Figure 19. 12" x 8.5" Desktop Board Dimensions
75
Intel Desktop Board D845PEBT2 Technical Product Specification
2.10.2 I/O Shield
The back panel I/O shield for Desktop Board D845PEBT2 must meet specific dimension and
material requirements. Systems based on the Desktop Board D845PEBT2 need the back panel I/O
shield to pass certification testing. The following figures show the critical dimensions of the three
types of I/O shields for the Desktop Board D845PEBT2:
• Figure 20 shows the I/O shield for boards with the 6-channel audio subsystem and a back panel
1394a-2000 connector.
• Figure 21 shows the I/O shield for boards with the 6-channel audio subsystem and without a
back panel 1394a-2000 connector.
• Figure 22 shows the I/O shield for boards with the 2-channel audio subsystem.
The figures indicate the position of each cutout and give dimensions in inches to a tolerance of
±0.02 inches. Additional design considerations for I/O shields relative to chassis requirements are
described in the ATX specification. See Section 1.4 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 2.03 is available from Intel.
162.30 Ref
[6.390]
1.60±0.13
[0.063±0.005]
20.00±0.13 TYP
[ 0.79±0.00]
1.00
[0.04]
8X R0.5 MIN
22.45
[0.88]
13.19
[0.519]
7.01
0.69
[0.28]
48.00
[0.027]
Ref
0.00
11.81 [1.89]
11.81
[0.47]
[0.47]
12.31
12.04
[0.485]
[0.474]
12.81
14.40
[0.504]
[0.567]
14.40
[0.567]
Pictorial
View
OM15046
Figure 20. I/O Shield Dimensions for Boards with a 6-Channel Audio Subsystem
and IEEE1394a-2000 Connector
76
0.00
11.35
[0.45]
30.37
[1.195]
45.89
[1.81]
52.80
[2.08]
84.80
[3.339]
96.69
[3.807]
110.58
[4.354]
125.67
[4.95]
143.12
[5.635]
Technical Reference
162.30 Ref
[6.390]
1.60±0.13
[0.063±0.005]
20.00±0.13 TYP
[ 0.79±0.00]
1.00
[0.04]
8X R0.5 MIN
22.45
[0.88]
13.19
[0.519]
7.01
0.69
[0.28]
48.00
[0.027]
Ref
0.00
11.81 [1.89]
11.81
[0.47]
[0.47]
12.31
12.04
[0.485]
[0.474]
12.81
14.40
[0.504]
[0.567]
14.40
[0.567]
Pictorial
View
OM14849
Figure 21. I/O Shield Dimensions for Boards with a 6-Channel Audio Subsystem
and Without IEEE 1394a-2000 Connector
77
0.00
11.35
[0.45]
30.37
[1.195]
45.89
[1.81]
52.80
[2.08]
84.80
[3.339]
96.69
[3.807]
110.58
[4.354]
125.67
[4.95]
143.12
[5.635]
Intel Desktop Board D845PEBT2 Technical Product Specification
162.300 Ref
[6.390]
1.60±0.13
[0.063±0.005]
20.00±0.13 TYP
[ 0.79±0.00]
1.00
[0.04]
8X R0.5 MIN
22.45
[0.88]
13.19
[0.519]
7.01
0.69
[0.28]
48.00
[0.027]
Ref
0.00
11.81 [1.89]
[0.47]
11.81
[0.47]
14.40
[0.567]
14.40
[0.567]
Pictorial Pictorial
View View
OM15047
Figure 22. I/O Shield Dimensions for Boards with a 2-Channel Audio Subsystem
78
0.00
11.35
[0.45]
30.37
[1.195]
45.89
[1.81]
52.80
[2.08]
84.80
[3.339]
125.67
[4.95]
143.12
[5.635]
Technical Reference
2.11 Electrical Considerations
2.11.1 Power Consumption
Table 55 lists voltage and current measurements for a computer that contains the Desktop Board
D845PEBT2 and the following:
• 2.8 GHz Intel Pentium 4 processor with a 512 KB cache
• 32 MB AGP card
• 512 MB DDR 266 SDRAM
• 3.5-inch diskette drive
• 10 GB IDE hard disk drive
• 12X IDE DVD/40X CD-ROM drive
†
• IDE Zip drive
This information is provided only as a guide for calculating approximate power usage with
additional resources added.
Values for the Windows XP Professional desktop mode are measured at 32-bit colors, 75 Hz
refresh rate, and screen resolution of 800 by 600 pixels. AC watts are measured with the computer
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 1.4 on page 17 for specification information).
Table 55. Power Usage
DC Current at:
Mode AC Power +3.3 V +5 V +12 V -12 V +5 VSB
ACPI S0 57.00 W 7.02 A 596 mA 1082.3 mA 12.4 mA 288.0 mA
ACPI S1 56.45 W 6.89 A 540 mA 1024.8 mA 12.3 mA 163.3 mA
ACPI S3 3.34 W 4.9 µA 3.1 mA 269.7 µA 325.6 µA 363.6 mA
ACPI S5 3.00 W 5.0 µA 3.1 mA 3.8 µA 56.8 µA 298.2 mA
2.11.2 Add-in Board Considerations
The Desktop Board D845PEBT2 is 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 for a fully loaded Desktop Board
D845PEBT2 (all five expansion slots and the AGP slot filled) must not exceed 12 A.
79
Intel Desktop Board D845PEBT2 Technical Product Specification
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 Desktop Board D845PEBT2 may lose register settings stored
in memory, etc. Calculate the standby current requirements using the steps described below.
Power supplies used with the Desktop Board D845PEBT2 must be able to provide enough standby
current to support the Instantly Available PC (ACPI S3 sleep state) configuration as outlined in
Table 56 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 56 and review the following steps.
1. Note the total Desktop Board D845PEBT2 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 56. Standby Current Requirements
Instantly Available PC Current Standby Current
Support (Estimated for Description Requirements (mA)
Integrated Board Components)
Total for Desktop Board 220
D845PEBT2
(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) 80
components
(Note)
CNR 375
• Add to Instantly Available
(Note)
USB ports 500
PC total current
requirement
(See instructions above)
Note: Dependent upon system configuration
80
Technical Reference
NOTES
✏
• IBM PS/2 Port Specification (Sept 1991) states:
275 mA for keyboard
70 mA for the mouse (nonwake-enabled 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
• 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
CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan
connector. Connecting the processor fan to a chassis fan connector may result in onboard
component damage that will halt fan operation.
Table 57 lists the current capability of the fan connectors on the Desktop Board D845PEBT2.
Table 57. Fan Connector Current Capability
Fan Connector Maximum Available Current
Processor fan 0.80 A
Front chassis fan 0.30 A
Rear chassis fan 0.30 A
81
Intel Desktop Board D845PEBT2 Technical Product Specification
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 79 for additional information.
System integrators should refer to the power usage values listed in Table 55 when selecting a
power supply for use with the Desktop Board D845PEBT2.
Measurements account only for current sourced by the Desktop Board D845PEBT2 while running
in idle modes of the started operating systems.
Additional power required will depend on configurations chosen by the integrator.
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 1.4, page 17
The ATX form factor specification
82
Technical Reference
2.12 Thermal Considerations
CAUTION
The use of an Intel Pentium 4 processor operating above 2.80 GHz with this Intel desktop board
requires the following:
• A chassis with appropriate airflow to ensure proper cooling of the components on the board
• A processor fan heatsink that meets the thermal performance targets for Pentium 4 processors
operating above 2.80 GHz
Failure to ensure appropriate airflow may result in reduced performance of both the processor
and/or voltage regulator or, in some instances, damage to the desktop board. For a list of chassis
that have been tested with Intel desktop boards please refer to the following website:
http://developer.intel.com/design/motherbd/cooling.htm
All responsibility for determining the adequacy of any thermal or system design remains solely
with the reader. Intel makes no warranties or representations that merely following the
instructions presented in this document will result in a system with adequate thermal performance.
CAUTION
Ensure that the ambient temperature does not exceed the Desktop Board D845PEBT2’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
(item A in Figure 23) can reach a temperature of up to 85 °C in an open chassis.
83
Intel Desktop Board D845PEBT2 Technical Product Specification
Figure 23 shows the locations of the localized high temperature zones.
A
B
C
D
OM15050
A Processor voltage regulator area
B Processor
C Intel 82845PE MCH
D Intel 82801DB ICH4
Figure 23. Localized High Temperature Zones
Table 58 provides maximum case temperatures for components on the Desktop Board
D845PEBT2 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 Desktop Board D845PEBT2.
Table 58. 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 82845PE MCH 83 C (under bias)
o
Intel 82801DB ICH4 110 C (under bias)
For information about Refer to
Intel Pentium 4 processor datasheets and specification updates Section 1.2, page 16
84
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 calculation for the Desktop
Board D845PEBT2 is 121,776.5741 hours.
2.14 Environmental
Table 59 lists the environmental specifications for the Desktop Board D845PEBT2.
Table 59. Desktop Board D845PEBT2 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
85
Intel Desktop Board D845PEBT2 Technical Product Specification
2.15 Regulatory Compliance
This section describes the Desktop Board D845PEBT2’s compliance with U.S. and international
safety and electromagnetic compatibility (EMC) regulations.
2.15.1 Safety Regulations
Table 60 lists the safety regulations the Desktop Board D845PEBT2 complies with when correctly
installed in a compatible host system.
Table 60. 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 61 lists the EMC regulations the Desktop Board D845PEBT2 complies with when correctly
installed in a compatible host system.
Table 61. 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)
86
Technical Reference
2.15.3 Product Certification Markings (Board Level)
The Desktop Board D845PEBT2 has 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
D845PEBT2 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). For the Desktop Board
D845PEBT2, the PB number is A99718-xxx or C10869-xxx (where xxx is any number). The
SKU number (component side) is AA followed by additional alphanumeric characters.
• Battery “+ Side Up” marking: located on the component side of the Desktop Board
D845PEBT2 in close proximity to the battery holder.
87
Intel Desktop Board D845PEBT2 Technical Product Specification
88
3 Overview of BIOS Features
What This Chapter Contains
3.1 Introduction.................................................................................................................89
3.2 BIOS Flash Memory Organization ..............................................................................90
3.3 PCI Autoconfiguration.................................................................................................90
3.4 System Management BIOS (SMBIOS).......................................................................90
3.5 Legacy USB Support ..................................................................................................91
3.6 BIOS Updates ............................................................................................................91
3.7 Recovering BIOS Data ...............................................................................................92
3.8 Boot Options...............................................................................................................93
3.9 Changing the Default Boot Device During POST........................................................94
®
3.10 Fast Booting Systems with Intel Rapid BIOS Boot....................................................94
3.11 BIOS Security Features..............................................................................................96
3.1 Introduction
The Desktop Board uses 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 BIOS displays a message during POST identifying the type of BIOS and a revision code. The
initial production BIOS is identified as BT84520A.86A.
When the Desktop 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 Desktop Board’s compliance level with Plug and Play Section 1.4, page 17
89
Intel Desktop Board D845PEBT2 Technical Product Specification
3.2 BIOS Flash Memory Organization
The 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 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 Refer to
The versions of PCI and Plug and Play supported by the BIOS Section 1.4, page 17
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 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 compliance level of the Desktop Board D845PEBT2 with SMBIOS Section 1.4, page 17
90
Overview of BIOS Features
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.
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.
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.
91
Intel Desktop Board D845PEBT2 Technical Product Specification
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 1.2, page 16
3.6.1 Language Support
The BIOS Setup program and help messages are supported in six languages: US English, German,
Italian, French, Spanish, and Japanese. Only two languages (US English and another language)
can be loaded on the board at one time.
The default language for the BIOS Setup program and help messages is US English. Another
language can be selected by using the program’s Main menu (page 99).
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 1.2, page 16
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
1.44 MB diskette or CD-ROM 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.
92
Overview of BIOS Features
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 72
The Boot menu in the BIOS Setup program Section 4.3, page 99
Contacting Intel customer support Section 1.2, page 16
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 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.
For information about Refer to
The El Torito specification Section 1.4, page 17
3.8.2 Network Boot
The network can be selected as a boot device. This selection allows booting from the onboard
LAN or from a network add-in card with a remote boot ROM installed.
Pressing the message.
continued
122
Error Messages and Beep Codes
Table 92. 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.
Frequently asked questions
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Why buy from GID?
Quality
We are industry veterans who take pride in our work
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Maintain legacy systems to prevent costly downtime
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What they say about us
FANTASTIC RESOURCE
One of our top priorities is maintaining our business with precision, and we are constantly looking for affiliates that can help us achieve our goal. With the aid of GID Industrial, our obsolete product management has never been more efficient. They have been a great resource to our company, and have quickly become a go-to supplier on our list!
Bucher Emhart Glass
EXCELLENT SERVICE
With our strict fundamentals and high expectations, we were surprised when we came across GID Industrial and their competitive pricing. When we approached them with our issue, they were incredibly confident in being able to provide us with a seamless solution at the best price for us. GID Industrial quickly understood our needs and provided us with excellent service, as well as fully tested product to ensure what we received would be the right fit for our company.
Fuji
HARD TO FIND A BETTER PROVIDER
Our company provides services to aid in the manufacture of technological products, such as semiconductors and flat panel displays, and often searching for distributors of obsolete product we require can waste time and money. Finding GID Industrial proved to be a great asset to our company, with cost effective solutions and superior knowledge on all of their materials, it’d be hard to find a better provider of obsolete or hard to find products.
Applied Materials
CONSISTENTLY DELIVERS QUALITY SOLUTIONS
Over the years, the equipment used in our company becomes discontinued, but they’re still of great use to us and our customers. Once these products are no longer available through the manufacturer, finding a reliable, quick supplier is a necessity, and luckily for us, GID Industrial has provided the most trustworthy, quality solutions to our obsolete component needs.
Nidec Vamco
TERRIFIC RESOURCE
This company has been a terrific help to us (I work for Trican Well Service) in sourcing the Micron Ram Memory we needed for our Siemens computers. Great service! And great pricing! I know when the product is shipping and when it will arrive, all the way through the ordering process.
Trican Well Service
GO TO SOURCE
When I can't find an obsolete part, I first call GID and they'll come up with my parts every time. Great customer service and follow up as well. Scott emails me from time to time to touch base and see if we're having trouble finding something.....which is often with our 25 yr old equipment.
ConAgra Foods