INTEL D975XBX2
Specifications
Audio
Intel High Definition Audio subsystem
BIOS
Intel BIOS resident in the SPI Flash device | Support for Advanced Configuration and Power Interface (ACPI), Plug and Play, and SMBIOS | Watchdog timer providing automatic recovery after two failed power-on self-tests (POSTs)
Chipset
Intel 975X Chipset, consisting of: Intel 82975X Memory Controller Hub (MCH) | Intel 82801GR I/O Controller Hub (ICH7-R) or Intel 82801GH I/O Controller Hub (ICH7-DH)
Form Factor
ATX (12.00 inches by 9.60 inches [304.80 millimeters by 243.84 millimeters])
Instantly Available PC Technology
Support for PCI Local Bus Specification Revision 2.2 | Support for PCI Express* Revision 1.0a | Suspend to RAM support | Wake on PCI, RS-232, front panel, PS/2 devices, and USB ports
LAN Support
Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the Intel 82573E/82573L Gigabit Ethernet Controller
Legacy I/O Control
Legacy I/O controller for diskette drive, serial, parallel, and PS/2 ports
Memory
Four 240-pin DDR2 SDRAM Dual Inline Memory Module (DIMM) sockets | Support for DDR2 800, DDR2 667, and DDR2 533 MHz DIMMs | Support for up to 8 GB of system memory | Support for ECC and non-ECC memory
Peripheral Interfaces
Eight USB ports | One serial port | One parallel port | Four Serial ATA interfaces with RAID support | One Parallel ATA IDE interface with UDMA 33, ATA-66/100 support | One diskette drive interface | PS/2* keyboard and mouse ports
Processor
Intel Core2 Extreme Processor in an LGA775 socket with a 1066 MHz system bus | Intel Core2 Duo Processor in an LGA775 socket with a 1066 MHz system bus | Intel Pentium Processor Extreme Edition in an LGA775 socket with a 1066 or 800 MHz system bus | Intel Pentium 4 Processor Extreme Edition in an LGA775 socket with a 1066 MHz system bus | Intel Pentium D Processor in an LGA775 socket with an 800 MHz system bus | Intel Pentium 4 Processor in an LGA775 socket with an 800 MHz system bus
Intel Pentium D
USB
Support for USB 2.0 devices
Features
- Fan speed control
- Hardware Monitor
- Hardware monitoring and fan control ASIC
- One PCI Express x16 (electrical x4) bus add-in card connector
- One Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector
- One Secondary PCI Express x16 (electrical x8) bus add-in card connector
- Subsystem
- Support for Product Environmental Control Interface (PECI)
- Thermal sense to detect out of range thermal values
- Three fan headers
- Three fan sense inputs used to monitor fan activity
- Voltage sense to detect out of range power supply voltages
Datasheet
Intel=D975XBX2=datasheet1-2087008465.pdf
2806 KiB
Extracted Text
Intel® Desktop Board
D975XBX2
Technical Product Specification
October 2006
Order Number: D73645-001US
®
The Intel Desktop Board D975XBX2 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 D975XBX2 Specification Update.
Revision History
Revision Revision History Date
®
-001 First release of the Intel Desktop Board D975XBX2 Technical Product October 2006
Specification
®
This product specification applies to only the standard Intel Desktop Board D975XBX2 with
BIOS identifier BX97520J.86A.
Changes to this specification will be published in the Intel Desktop Board D975XBX2.
Specification Update before being incorporated into a revision of this document.
®
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE,
EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS
GRANTED BY THIS DOCUMENT. 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
PRODUCTS ARE NOT INTENDED FOR USE IN MEDICAL, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS.
®
All Intel desktop boards are evaluated as Information Technology Equipment (I.T.E.) for use in personal
computers (PC) for installation in homes, offices, schools, computer rooms, and similar locations. The
suitability of this product for other PC or embedded non-PC applications or other environments, such as
medical, industrial, alarm systems, test equipment, etc. may not be supported without further evaluation by
Intel.
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 may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked “reserved”
or “undefined.” Intel reserves these for future definition and shall have no responsibility whatsoever for
conflicts or incompatibilities arising from future changes to them.
Intel desktop boards may contain design defects or errors known as errata, which 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, and Celeron 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 © 2006, Intel Corporation. All rights reserved.
Preface
This Technical Product Specification (TPS) specifies the board layout, components,
®
connectors, power and environmental requirements, and the BIOS for the Intel
Desktop Board D975XBX2. It describes the standard product and available
manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Intel Desktop
Board D975XBX2 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 D975XBX2
2 A map of the resources of the Desktop Board
3 The features supported by the BIOS Setup program
4 A description of the BIOS error messages, beep codes, and POST codes
5 Regulatory compliance and battery disposal information
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.
INTEGRATOR’S NOTES
#
Integrator’s notes are used to call attention to information that may be useful to
system integrators.
CAUTION
Cautions are included to help you avoid damaging hardware or losing data.
iii
Intel Desktop Board D975XBX2 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 D975XBX2, 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
Gbits/sec Gigabits 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 ...................................................................... 16
1.2 Online Support................................................................................. 17
1.3 Processor ........................................................................................ 17
1.4 System Memory ............................................................................... 18
1.4.1 Memory Configurations .......................................................... 20
®
1.5 Intel 975X Chipset .......................................................................... 24
1.5.1 USB..................................................................................... 24
1.5.2 IDE Support ......................................................................... 25
1.5.3 Real-Time Clock, CMOS SRAM, and Battery .............................. 26
1.6 Discrete Serial ATA Interface (Optional) .............................................. 27
1.6.1 Serial ATA Controller.............................................................. 27
1.6.2 External Serial ATA Support.................................................... 27
1.7 PCI Express Connectors..................................................................... 28
1.8 IEEE-1394a Connectors (Optional)...................................................... 29
1.9 Legacy I/O Controller........................................................................ 29
1.9.1 Serial Port ............................................................................ 29
1.9.2 Parallel Port.......................................................................... 30
1.9.3 Diskette Drive Controller ........................................................ 30
1.9.4 Keyboard and Mouse Interface................................................ 30
1.10 Audio Subsystem.............................................................................. 31
1.10.1 Audio Subsystem Software ..................................................... 31
1.10.2 Audio Connectors .................................................................. 31
1.10.3 8-Channel (7.1) Audio Subsystem ........................................... 32
1.10.4 6-Channel (5.1) Audio Subsystem ........................................... 33
1.11 LAN Subsystem................................................................................ 34
®
1.11.1 Intel 82573E/82573L Gigabit Ethernet Controller..................... 34
1.11.2 RJ-45 LAN Connector with Integrated LEDs .............................. 34
1.11.3 Alert Standard Format (ASF) Support ...................................... 35
®
1.11.4 Intel Active Management Technology (Optional) ...................... 35
1.11.5 LAN Subsystem Software ....................................................... 37
1.12 Hardware Management Subsystem ..................................................... 37
1.12.1 Hardware Monitoring and Fan Control ASIC .............................. 37
1.12.2 Thermal Monitoring ............................................................... 38
1.12.3 Fan Monitoring...................................................................... 39
1.12.4 Chassis Intrusion and Detection .............................................. 39
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Intel Desktop Board D975XBX2 Technical Product Specification
1.13 Power Management .......................................................................... 39
1.13.1 ACPI.................................................................................... 39
1.13.2 Hardware Support ................................................................. 42
1.14 Onboard Power Button ...................................................................... 46
1.15 Onboard LEDs .................................................................................. 47
1.16 Trusted Platform Module (Optional)..................................................... 48
2 Technical Reference
2.1 Memory Resources ........................................................................... 49
2.1.1 Addressable Memory ............................................................. 49
2.1.2 Memory Map......................................................................... 51
2.2 DMA Channels.................................................................................. 51
2.3 Fixed I/O Map .................................................................................. 52
2.4 PCI Configuration Space Map ............................................................. 53
2.5 Interrupts........................................................................................ 54
2.6 PCI Conventional Interrupt Routing Map.............................................. 55
2.7 Connectors ...................................................................................... 56
2.7.1 Back Panel Connectors........................................................... 56
2.7.2 Component-side Connectors and Headers................................. 59
2.8 Jumper Block ................................................................................... 70
2.9 Mechanical Considerations ................................................................. 71
2.9.1 Form Factor.......................................................................... 71
2.9.2 I/O Shield ............................................................................ 72
2.10 Electrical Considerations.................................................................... 74
2.10.1 DC Loading........................................................................... 74
2.10.2 Add-in Board Considerations................................................... 74
2.10.3 Fan Header Current Capability ................................................ 75
2.10.4 Power Supply Considerations .................................................. 75
2.11 Thermal Considerations..................................................................... 76
2.12 Reliability......................................................................................... 78
2.13 Environmental.................................................................................. 79
3 Overview of BIOS Features
3.1 Introduction..................................................................................... 81
3.2 Resource Configuration ..................................................................... 82
3.2.1 PCI Autoconfiguration ............................................................ 82
3.2.2 PCI IDE Support.................................................................... 82
3.3 System Management BIOS (SMBIOS) ................................................. 83
3.4 Watchdog Timer ............................................................................... 83
3.5 Legacy USB Support ......................................................................... 84
3.6 BIOS Updates .................................................................................. 84
3.6.1 Language Support ................................................................. 85
3.6.2 Custom Splash Screen ........................................................... 85
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Contents
3.7 Boot Options.................................................................................... 85
3.7.1 CD-ROM Boot ....................................................................... 85
3.7.2 Network Boot........................................................................ 85
3.7.3 Booting Without Attached Devices ........................................... 86
3.7.4 Changing the Default Boot Device During POST......................... 86
3.8 BIOS Security Features ..................................................................... 87
4 Error Messages and Beep Codes
4.1 Speaker .......................................................................................... 89
4.2 BIOS Beep Codes ............................................................................. 89
4.3 BIOS Error Messages ........................................................................ 89
4.4 Port 80h POST Codes ........................................................................ 90
5 Regulatory Compliance and Battery Disposal Information
5.1 Regulatory Compliance...................................................................... 95
5.1.1 Safety Regulations ................................................................ 95
5.1.2 European Union Declaration of Conformity Statement ................ 95
5.1.3 Product Ecology Statements ................................................... 97
5.1.4 EMC Regulations ..................................................................101
5.1.5 Product Certification Markings (Board Level)............................102
5.2 Battery Disposal Information.............................................................103
Figures
1. Desktop Board Components............................................................... 14
2. Block Diagram.................................................................................. 16
3. Memory Channel and DIMM Configuration............................................ 20
4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs............ 21
5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs ......... 21
6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs ........... 22
7. Single Channel (Asymmetric) Mode Configuration with One DIMM........... 23
8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs....... 23
9. Location of External Serial ATA-Compatible SATA Port........................... 27
10. Front/Back Panel Audio Connector Options for 8-Channel (7.1)
Audio Subsystem.............................................................................. 32
11. Front/Back Panel Audio Connector Options for 6-Channel (5.1)
Audio Subsystem.............................................................................. 33
12. LAN Connector LED Locations............................................................. 34
13. Sensors and Fan Connectors.............................................................. 38
14. Location of the Standby Power Indicator LED ....................................... 45
15. Location of the Onboard Power Button ................................................ 46
16. Location of the CPU and Processor Voltage Regulator LEDs .................... 47
17. Detailed System Memory Address Map................................................ 50
18. Back Panel Connectors for 8-Channel (7.1) Audio Subsystem................. 57
19. Back Panel Connectors for 6-Channel (5.1) Audio Subsystem................. 58
20. Component-side Connectors and Headers............................................ 59
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Intel Desktop Board D975XBX2 Technical Product Specification
21. Connection Diagram for Front Panel Header......................................... 66
22. Connection Diagram for Front Panel USB Headers................................. 68
23. Connection Diagram for Front Panel IEEE 1394a Header........................ 69
24. Location of the Jumper Block ............................................................. 70
25. Board Dimensions............................................................................. 71
26. I/O Shield Dimensions for Boards with the 8-Channel (7.1)
Audio Subsystem.............................................................................. 72
27. I/O Shield Dimensions for Boards with the 6-Channel (5.1)
Audio Subsystem.............................................................................. 73
28. Localized High Temperature Zones ..................................................... 77
Tables
1. Feature Summary............................................................................. 12
2. Manufacturing Options ...................................................................... 13
3. Components Shown in Figure 1 .......................................................... 15
4. Supported Memory Configurations ...................................................... 18
5. Memory Operating Frequencies .......................................................... 19
6. LAN Connector LED States................................................................. 34
7. Effects of Pressing the Power Switch ................................................... 40
8. Power States and Targeted System Power ........................................... 41
9. Wake-up Devices and Events ............................................................. 42
10. System Memory Map ........................................................................ 51
11. DMA Channels.................................................................................. 51
12. I/O Map........................................................................................... 52
13. PCI Configuration Space Map ............................................................. 53
14. Interrupts........................................................................................ 54
15. PCI Interrupt Routing Map ................................................................. 55
16. Component-side Connectors and Headers Shown in Figure 20................ 60
17. ATAPI CD-ROM Connector (Optional) .................................................. 61
18. Front Panel Audio Header .................................................................. 61
19. Front Chassis, Rear Chassis, and MCH Fan Headers .............................. 61
20. Processor Fan and Auxiliary Rear Fan Header....................................... 61
21. Chassis Intrusion Header................................................................... 62
22. SCSI Hard Drive Activity LED Header (Optional) ................................... 62
23. Serial ATA Connectors....................................................................... 62
24. Main Power Connector....................................................................... 64
25. Processor Core Power Connector (2 x 4 Pin)......................................... 64
26. Processor Core Power Connector (2 x 2 Pin)......................................... 64
27. Auxiliary PCI Express Graphics Power.................................................. 64
28. Auxiliary Front Panel Power/Sleep LED Header ..................................... 65
29. Front Panel Header ........................................................................... 66
30. States for a One-Color Power LED....................................................... 67
31. States for a Two-Color Power LED ...................................................... 67
32. BIOS Setup Configuration Jumper Settings .......................................... 70
33. DC Loading Characteristics ................................................................ 74
viii
Contents
34. Fan Header Current Capability............................................................ 75
35. Thermal Considerations for Components.............................................. 78
36. Environmental Specifications.............................................................. 79
37. BIOS Setup Program Menu Bar........................................................... 82
38. BIOS Setup Program Function Keys .................................................... 82
39. Boot Device Menu Options ................................................................. 86
40. Supervisor and User Password Functions ............................................. 87
41. Beep Codes ..................................................................................... 89
42. BIOS Error Messages ........................................................................ 89
43. Port 80h POST Code Ranges .............................................................. 90
44. Port 80h POST Codes ........................................................................ 91
45. Typical Port 80h POST Sequence ........................................................ 94
46. Safety Regulations............................................................................ 95
47. Lead-Free Board Markings ................................................................100
48. EMC Regulations..............................................................................101
49. Product Certification Markings ...........................................................102
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Intel Desktop Board D975XBX2 Technical Product Specification
x
1 Product Description
What This Chapter Contains
1.1 Overview......................................................................................... 12
1.2 Online Support................................................................................. 17
1.3 Processor ........................................................................................ 17
1.4 System Memory ............................................................................... 18
®
1.5 Intel 975X Chipset .......................................................................... 24
1.6 Discrete Serial ATA Interface (Optional) .............................................. 27
1.7 PCI Express Connectors..................................................................... 28
1.8 IEEE-1394a Connectors (Optional)...................................................... 29
1.9 Legacy I/O Controller........................................................................ 29
1.10 Audio Subsystem.............................................................................. 31
1.11 LAN Subsystem................................................................................ 34
1.12 Hardware Management Subsystem ..................................................... 37
1.13 Power Management .......................................................................... 39
1.14 Onboard Power Button ...................................................................... 46
1.15 Onboard LEDs .................................................................................. 47
1.16 Trusted Platform Module (Optional)..................................................... 48
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Intel Desktop Board D975XBX2 Technical Product Specification
1.1 Overview
1.1.1 Feature Summary
Table 1 summarizes the major features of the board.
Table 1. Feature Summary
ATX (12.00 inches by 9.60 inches [304.80 millimeters by 243.84 millimeters])
Form Factor
®
• Intel Core™2 Extreme Processor in an LGA775 socket with a 1066 MHz
Processor
system bus
®
• Intel Core™2 Duo Processor in an LGA775 socket with a 1066 MHz system
bus
® ®
• Intel Pentium Processor Extreme Edition in an LGA775 socket with a 1066
or 800 MHz system bus
® ®
• Intel Pentium 4 Processor Extreme Edition in an LGA775 socket with a
1066 MHz system bus
® ®
• Intel Pentium D Processor in an LGA775 socket with an 800 MHz system
bus
® ®
• Intel Pentium 4 Processor in an LGA775 socket with an 800 MHz system
bus
• Four 240-pin DDR2 SDRAM Dual Inline Memory Module (DIMM) sockets
Memory
• Support for DDR2 800, DDR2 667, and DDR2 533 MHz DIMMs
• Support for up to 8 GB of system memory
• Support for ECC and non-ECC memory
®
Chipset
Intel 975X Chipset, consisting of:
®
• Intel 82975X Memory Controller Hub (MCH)
®
• Intel 82801GR I/O Controller Hub (ICH7-R) or
®
Intel 82801GH I/O Controller Hub (ICH7-DH)
®
Audio Intel High Definition Audio subsystem
Legacy I/O Control Legacy I/O controller for diskette drive, serial, parallel, and PS/2 ports
USB Support for USB 2.0 devices
• Eight USB ports
Peripheral
Interfaces • One serial port
• One parallel port
• Four Serial ATA interfaces with RAID support
• One Parallel ATA IDE interface with UDMA 33, ATA-66/100 support
• One diskette drive interface
• PS/2* keyboard and mouse ports
®
• Intel BIOS resident in the SPI Flash device
BIOS
• Support for Advanced Configuration and Power Interface (ACPI), Plug and
Play, and SMBIOS
• Watchdog timer providing automatic recovery after two failed power-on
self-tests (POSTs)
• Support for PCI Local Bus Specification Revision 2.2
Instantly Available
PC Technology • Support for PCI Express* Revision 1.0a
• Suspend to RAM support
• Wake on PCI, RS-232, front panel, PS/2 devices, and USB ports
Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the
LAN Support
®
82573E/82573L Gigabit Ethernet Controller
Intel
continued
12
Product Description
Table 1. Feature Summary (continued)
• Two PCI* Conventional bus add-in card connectors (SMBus routed to both PCI
Expansion
Conventional bus add-in card connectors)
Capabilities
• One Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector
• One Secondary PCI Express x16 (electrical x8) bus add-in card connector
• One PCI Express x16 (electrical x4) bus add-in card connector
• Hardware monitoring and fan control ASIC
Hardware Monitor
Subsystem
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• Three fan headers
• Three fan sense inputs used to monitor fan activity
• Fan speed control
• Support for Product Environmental Control Interface (PECI)
1.1.2 Manufacturing Options
Table 2 describes the manufacturing options. Not every manufacturing option is
available in all marketing channels. Please contact your Intel representative to
determine which manufacturing options are available to you.
Table 2. Manufacturing Options
® ®
BIOS support for Intel Active Management Technology (Intel AMT)
AMT
A 1 x 4-pin ATAPI-style connector for connecting an internal ATAPI CD-ROM drive
ATAPI CD-ROM
to the audio mixer
Connector
Audio Subsystem Intel High Definition Audio subsystem in one of the following configurations:
• 8-channel (7.1) audio subsystem with five analog audio outputs and two S/PDIF
digital audio outputs (coaxial and optical) using the SigmaTel* 9274D audio
codec
• 6-channel (5.1) audio subsystem with three analog audio outputs using the
Sigmatel 9227 audio codec
Provides required additional power when using high power (75 W or greater) add-in
Auxiliary PCI
cards in either or both the Secondary PCI Express x16 (electrical x8) and the PCI
Express Graphics
Express x16 (electrical x4) bus add-in card connectors
Power Connector
• Marvell* 88SE6145 SATA RAID controller
Discrete SATA
RAID Controller • Four SATA connectors (in addition to the four SATA connectors on the
ICH7-R/ICH7-DH SATA interface)
IEEE-1394a controller and two IEEE-1394a connectors: one back panel connector
IEEE-1394a
and one front-panel header
Interface
®
A 3-pin header for powering a fan for the Intel 82975X Memory Controller Hub
MCH Fan Header
(MCH)
One of the following connectors for providing +12 V power to the processor voltage
Processor Core
regulator:
Power Connector
• 2 x 4-pin (requires a power supply with a dual-rail 2 x 4 power cable). Boards
equipped with the 2 x 4-pin processor core power connector will also include
heatsinks in the processor voltage regulator area.
• 2 x 2-pin
Allows add-in hard drive controllers (SCSI or other) to use the same LED as the
SCSI Hard Drive
onboard IDE controller
LED Header
A component that enhances platform security
Trusted Platform
Module (TPM)
13
Intel Desktop Board D975XBX2 Technical Product Specification
For information about Refer to
Available configurations for the board Section 1.2, page 17
1.1.3 Board Layout
Figure 1 shows the location of the major components.
Figure 1. Desktop Board Components
Table 3 lists the components identified in Figure 1.
14
Product Description
Table 3. Components Shown in Figure 1
Item/callout
from Figure 1 Description
A Auxiliary rear fan header
B PCI Conventional bus add-in card connector 2
C PCI Express x16 (electrical x4) bus add-in card connector
PCI Conventional bus add-in card connector 1
D
Secondary PCI Express x16 (electrical x8) bus add-in card connector
E
Front panel audio header
F
®
Intel 82801G I/O Controller Hub (ICH7-R or ICH7-DH)
G
Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector
H
Rear chassis fan header
I
J Auxiliary PCI Express Graphics Power Connector (optional)
Back panel connectors
K
ATAPI CD-ROM connector (optional)
L
Processor core power connector
M
Memory Controller Hub (MCH) fan header (optional)
N
LGA775 processor socket
O
P Intel 82975X MCH
Q DIMM Channel A sockets [2]
R Processor fan header
S DIMM Channel B sockets [2]
T Main power connector
U Diskette drive connector
V BIOS Setup configuration jumper block
W Chassis intrusion header
X Onboard power button
Y Battery
Z Parallel ATE IDE connector
AA Serial ATA connectors (ICH7-R/ICH7-DH RAID) [4]
BB Front chassis fan header
Auxiliary front panel power LED header
CC
Front panel USB headers [2]
DD
IEEE-1394a front panel header
EE
Serial ATA RAID connectors (Discrete RAID) (optional) [3]
FF
Serial ATA RAID connector compatible with external Serial ATA adapter (red)
GG
SCSI Hard Drive Activity LED header (optional)
HH
Front panel header
II
Speaker
JJ
15
Intel Desktop Board D975XBX2 Technical Product Specification
1.1.4 Block Diagram
Figure 2 is a block diagram of the major functional areas of the board.
PCI Express Interface
Gigabit Ethernet LAN
PCI Express x16
Controller Connector
(Electrical x4) Slot
SMBus
Parallel ATA Parallel ATA Back Panel/Front Panel
USB
IDE Connector IDE Interface USB Ports
LGA775 Serial Port
System Bus
Processor
(1066/800 MHz) LPC Bus
Parallel Port
Socket
I/O
PS/2 Mouse
Controller
PS/2 Keyboard
Primary
SMBus
PCI Express
Diskette Drive
x16 Connector
Connector
Secondary
PCI Express
x16 Connector Intel 975X Chipset
Intel 82801GR/ Serial Peripheral
Intel 82975X
82801GH Interface (SPI)
Memory Controller
I/O Controller Hub Flash
PCI Express Hub (MCH)
(ICH7-R/ICH7-DH) Device
X16 Interface
Dual-Channel
TPM Component
Memory Bus LPC Bus
Channel A
(Optional)
DIMMs (2) SMBus
SATA IDE
SATA IDE
Channel B
Connectors (4)
DIMMs (2) Interface
IEEE-1394a
PCI
IEEE-1394a Connectors
Controller
Front Panel Mic In
Bus
(Optional)
(Optional)
Front Panel Line Out
SATA RAID Discrete SATA RAID
PCI
Connectors (4) Controller Mic In/Retasking Jack
Bus
(Optional) (Optional)
Line In/Retasking Jack
PCI Bus
Audio
Line Out/Retasking Jack
Codec
PCI Slot 1 CD-ROM (Optional)
PCI Slot 2 SMBus S/PDIF
Hardware Monitoring Center and LFE/Retasking Jack
and Fan Control ASIC
Surround Left-Right/Retasking Jack
OM18546
Figure 2. Block Diagram
16
DMI Interconnect
High Definition Audio Link
LPC
Bus
Product Description
1.2 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board D975XBX2 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 http://developer.intel.com/design/motherbd/bx2/bx2_available.htm
Desktop Board D975XBX2
Processor data sheets http://www.intel.com/design/litcentr
ICH7-R/ICH7-DH addressing http://developer.intel.com/design/chipsets/datashts
Custom splash screens http://intel.com/design/motherbd/gen_indx.htm
Audio software and utilities http://www.intel.com/design/motherbd
LAN software and drivers http://www.intel.com/design/motherbd
1.3 Processor
The board is designed to support the following processors:
• Intel Core 2 Extreme Processor in an LGA775 socket with a 1066 MHz system bus
• Intel Core 2 Duo Processor in an LGA775 socket with a 1066 MHz system bus
• Intel Pentium Processor Extreme Edition in an LGA775 socket with a 1066 or
800 MHz system bus
• Intel Pentium 4 Processor Extreme Edition in an LGA775 socket with a 1066 MHz
system bus
• Intel Pentium D Processor in an LGA775 socket with an 800 MHz system bus
• Intel Pentium 4 Processor in an LGA775 socket with an 800 MHz system bus
See the Intel web site listed below for the most up-to-date list of supported
processors.
For information about… Refer to:
Supported processors for the board http://www.intel.com/design/motherbd/bx2/bx2_proc.htm
CAUTION
Use only the processors listed on web site above. Use of unsupported processors can
damage the board, the processor, and the power supply.
INTEGRATOR’S NOTE
#
This board has specific requirements for providing power to the processor. Refer to
Section 2.7.2.1 on page 63 for information on power supply requirements for this
board.
17
Intel Desktop Board D975XBX2 Technical Product Specification
1.4 System Memory
The board has four DIMM sockets and supports the following memory features:
• 1.8 V and 1.9 V DDR2 SDRAM DIMMs
• Unbuffered, single-sided or double-sided DIMMs with the following restriction:
Double-sided DIMMS with x16 organization are not supported.
• 8 GB maximum total system memory. Refer to Section 2.1.1 on page 49 for
information on the total amount of addressable memory.
• Minimum total system memory: 128 MB
• ECC DIMMs and non-ECC DIMMs
• Serial Presence Detect
• DDR2 800, DDR2 667, and DDR2 533 MHz SDRAM DIMMs
� NOTES
• Remove the Primary PCI Express x16 (electrical x16 or x8) 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
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.
Table 4 lists the supported DIMM configurations.
Table 4. Supported Memory Configurations
DIMM Configuration SDRAM SDRAM Organization Number of SDRAM
(Note 1) (Note 2)
Capacity Density Front-side/Back-side Devices
128 MB SS 256 Mbit 16 M x 16/empty 4 [5]
256 MB SS 256 Mbit 32 M x 8/empty 8 [9]
256 MB SS 512 Mbit 32 M x 16/empty 4 [5]
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16 [18]
512 MB SS 512 Mbit 64 M x 8/empty 8 [9]
512 MB SS 1 Gbit 64 M x 16/empty 4 [5]
1024 MB DS 512 Mbit 64 M x 8/64 M x 8 16 [18]
1024 MB SS 1 Gbit 128 M x 8/empty 8 [9]
2048 MB DS 1 Gbit 128 M x 8/128 M x 8 16 [18]
Notes:
1. In the second column, “DS” refers to double-sided memory modules (containing two rows of SDRAM)
and “SS” refers to single-sided memory modules (containing one row of SDRAM).
2. In the fifth column, the number in brackets specifies the number of SDRAM devices on an ECC DIMM.
18
Product Description
INTEGRATOR’S NOTE
#
Refer to Section 2.1.1, on page 49 for additional information on available memory.
NOTE
�
Regardless of the DIMM type used, the memory frequency will either be equal to or
less than the processor system bus frequency. For example, if DDR2 800 memory
is used with a 533 MHz system bus frequency processor, the memory will operate at
533 MHz. Table 5 lists the resulting operating memory frequencies based on the
combination of DIMMs and processors.
Table 5. Memory Operating Frequencies
DIMM Type Processor System Bus Frequency Resulting Memory Frequency
DDR2 533 800 MHz 533 MHz
DDR2 533 1066 MHz 533 MHz
DDR2 667 800 MHz 667 MHz
DDR2 667 1066 MHz 667 MHz
DDR2 800 800 MHz 800 MHz
DDR2 800 1066 MHz 800 MHz
19
Intel Desktop Board D975XBX2 Technical Product Specification
1.4.1 Memory Configurations
The Intel 82975X MCH supports two types of memory organization:
• Dual channel (Interleaved) mode. This mode offers the highest throughput for
real world applications. Dual channel mode is enabled when the installed memory
capacities of both DIMM channels are equal. Technology and device width can vary
from one channel to the other but the installed memory capacity for each channel
must be equal. If different speed DIMMs are used between channels, the slowest
memory timing will be used.
• Single channel (Asymmetric) mode. This mode is equivalent to single channel
bandwidth operation for real world applications. This mode is used when only a
single DIMM is installed or the memory capacities are unequal. Technology and
device width can vary from one channel to the other. If different speed DIMMs are
used between channels, the slowest memory timing will be used.
Figure 3 illustrates the memory channel and DIMM configuration.
NOTE
�
The DIMM0 sockets of both channels are blue. The DIMM1 sockets of both channels
are black.
Figure 3. Memory Channel and DIMM Configuration
20
Product Description
1.4.1.1 Dual Channel (Interleaved) Mode Configurations
Figure 4 shows a dual channel configuration using two DIMMs. In this example, the
DIMM0 (blue) sockets of both channels are populated with identical DIMMs.
Figure 4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs
Figure 5 shows a dual channel configuration using three DIMMs. In this example, the
combined capacity of the two DIMMs in Channel A equal the capacity of the single
DIMM in the DIMM0 (blue) socket of Channel B.
Figure 5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs
21
Intel Desktop Board D975XBX2 Technical Product Specification
Figure 6 shows a dual channel configuration using four DIMMs. In this example, the
combined capacity of the two DIMMs in Channel A equal the combined capacity of the
two DIMMs in Channel B. Also, the DIMMs are matched between DIMM0 and DIMM1 of
both channels.
Figure 6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs
22
Product Description
1.4.1.2 Single Channel (Asymmetric) Mode Configurations
NOTE
�
Dual channel (Interleaved) mode configurations provide the highest memory
throughput.
Figure 7 shows a single channel configuration using one DIMM. In this example, only
the DIMM0 (blue) socket of Channel A is populated. Channel B is not populated.
Figure 7. Single Channel (Asymmetric) Mode Configuration with One DIMM
Figure 8 shows a single channel configuration using three DIMMs. In this example, the
combined capacity of the two DIMMs in Channel A does not equal the capacity of the
single DIMM in the DIMM0 (blue) socket of Channel B.
Figure 8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs
23
Intel Desktop Board D975XBX2 Technical Product Specification
®
1.5 Intel 975X Chipset
The Intel 975X chipset consists of the following devices:
• Intel 82975X Memory Controller Hub (MCH) with Direct Media Interface (DMI)
interconnect
• One of the following:
⎯ Intel 82801GR I/O Controller Hub (ICH7-R) with DMI interconnect
⎯ Intel 82801GH I/O Controller Hub (ICH7-DH) with DMI interconnect
The MCH is a centralized controller for the system bus, the memory bus, the PCI
Express bus, and the DMI interconnect. The ICH7 is a centralized controller for the
board’s I/O paths. The BIOS code is stored in the Serial Peripheral Interface (SPI)
Flash device.
For information about Refer to
The Intel 975X chipset http://developer.intel.com/
Resources used by the chipset Chapter 2
1.5.1 USB
The board supports up to eight USB 2.0 ports, supports UHCI and EHCI, and uses
UHCI- and EHCI-compatible drivers.
The ICH7-R/ICH7-DH provides the USB controller for all ports. The port arrangement
is as follows:
• Four ports are implemented with dual stacked back panel connectors adjacent to
the audio connectors
• Four ports are routed to two separate front panel USB headers
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.
For information about Refer to
The location of the USB connectors on the back panel Figure 19, page 58
The location of the front panel USB headers Figure 20, page 59
24
Product Description
1.5.2 IDE Support
The board provides five IDE interface connectors:
• One parallel ATA IDE connector that supports two devices
• Four serial ATA IDE connectors that support one device per connector
1.5.2.1 Parallel ATE IDE Interface
The ICH7-R/ICH7-DH’s Parallel ATA IDE controller has one bus-mastering Parallel ATA
IDE interface. The Parallel ATA IDE interface supports 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 ICH7-R/
ICH7-DH’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 Parallel ATA IDE interface also supports ATAPI devices (such as CD-ROM drives)
and ATA devices using the transfer modes.
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.
For information about Refer to
The location of the Parallel ATA IDE connector Figure 20, page 59
1.5.2.2 Serial ATA Interfaces
The ICH7-R/ICH7-DH’s Serial ATA controller offers four independent Serial ATA ports
with a theoretical maximum transfer rate of 3 Gbits/sec per port. One device can be
installed on each port for a maximum of four Serial ATA devices. A point-to-point
interface is used for host to device connections, unlike Parallel ATA IDE which supports
a master/slave configuration and two devices per channel.
For compatibility, the underlying Serial ATA functionality is transparent to the
operating system. The Serial ATA controller can operate in both legacy and native
modes. In legacy mode, standard IDE I/O and IRQ resources are assigned (IRQ 14
and 15). In Native mode, standard PCI Conventional bus resource steering is used.
25
Intel Desktop Board D975XBX2 Technical Product Specification
Native mode is the preferred mode for configurations using the Microsoft Windows* XP
and Microsoft Windows 2000 operating systems.
NOTE
�
Many Serial ATA drives use new low-voltage power connectors and require adaptors or
power supplies equipped with low-voltage power connectors.
For more information, see: http://www.serialata.org/
For information about Refer to
The location of the Serial ATA IDE connectors on the D975XBX2 board Figure 20, page 59
1.5.2.3 Serial ATA RAID
The ICH7-R/ICH7-DH supports the following RAID (Redundant Array of Independent
Drives) levels:
• RAID 0 - data striping
• RAID 1 - data mirroring
• RAID 0+1 (or RAID 10) - data striping and mirroring
• RAID 5 - distributed parity
1.5.2.4 SCSI Hard Drive Activity LED Header (Optional)
The SCSI hard drive activity LED header is a 1 x 2-pin header that allows an add-in
hard drive controller to use the same LED as the onboard IDE controller. For proper
operation, this header 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, either the
add-in hard drive controller or the onboard IDE controller (Parallel ATA or Serial ATA).
For information about Refer to
The location of the SCSI hard drive activity LED header Figure 20, page 59
The signal names of the SCSI hard drive activity LED header Table 22, page 62
1.5.3 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.
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate. Replace the
battery with an equivalent one. Figure 1 on page 14 shows the location of the battery.
26
Product Description
1.6 Discrete Serial ATA Interface (Optional)
1.6.1 Serial ATA Controller
As a manufacturing option, the board provides a Marvell 88SE6145 Serial ATA (SATA)
controller and four connectors (that support one device per connector) for SATA
devices. These connectors are in addition to the four SATA connectors of the
ICH7-R/ICH7-DH SATA interface.
The Marvell 88SE6145 controller uses the PCI bus for data transfer with a theoretical
maximum transfer rate of 3 Gbits/sec per port. The discrete SATA interface supports
the following RAID levels:
• RAID 0
• RAID 1
NOTE
�
The Marvell 88SE6145 controller supports single drive non-RAID configurations as well
as RAID configurations.
For information about Refer to
The location of the discrete SATA RAID connectors Figure 20, page 59
1.6.2 External Serial ATA Support
The red Serial ATA connector can be used with a back panel adapter for an external
SATA drive. Figure 9 shows the location of the External Serial ATA-compatible SATA
port.
Figure 9. Location of External Serial ATA-Compatible SATA Port
27
Intel Desktop Board D975XBX2 Technical Product Specification
1.7 PCI Express Connectors
The board provides the following PCI Express connectors:
• One Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector. The
x16 interface supports simultaneous (full duplex) transfers up to 8 GBytes/sec.
Single-ended (half duplex) transfers are supported at up to 4 GBytes/sec.
• One Secondary PCI Express x16 (electrical x8) bus add-in card connector: The
board provides a PCI Express add-in card connector in the form of a physical x16
connector with electrical routing of x8. This connector is an electrical equivalent of
a PCI Express x8 bus add-in card connector. This connector also supports x4 and
x1 PCI Express add-in cards.
• One PCI Express x16 (electrical x4) bus add-in card connector: The board provides
a PCI Express add-in card connector in the form of a physical x16 connector with
electrical routing of x4. This connector is an electrical equivalent of a PCI Express
x4 bus add-in card connector. This connector supports x4 and x1 PCI Express
add-in cards.
For optimum performance, observe the following recommendations for the PCI Express
add-in card connectors:
• If you are installing a single PCI Express Graphics card, install it in the Primary
PCI Express x16 (electrical x16 or x8) bus add-in card connector.
• If you are installing two PCI Express Graphics cards, install them in the Primary
PCI Express x16 (electrical x16 or x8) bus add-in card connector and the
Secondary PCI Express x16 (electrical x8) bus add-in card connector.
The PCI Express interfaces for the Primary and Secondary PCI Express x16 connectors
are routed through the MCH. The PCI Express interface for the PCI Express x16
(electrical x4) connector is routed through the ICH7-R/ICH7-DH. Therefore, the
Primary and Secondary PCI Express x16 connectors provide higher performance than
the PCI Express x16 (electrical x4) bus add-in card connector.
For information about Refer to
The locations of the specific PCI Express x16 add-in card connectors Figure 1, page 14
INTEGRATOR’S NOTE
#
Although the PCI Express specification allows x16 cards to auto-negotiate down from
x16 to x4 and x1 and may function properly, such configurations have not been
validated on this board. Please consult your add-in card vendor prior to attempting to
use a PCI Express x16 add-in card in this connector.
The PCI Express interface supports the PCI Conventional bus configuration mechanism
so that the underlying PCI Express architecture is compatible with PCI Conventional
compliant operating systems. Additional features of the PCI Express interface includes
the following:
• Support for the PCI Express enhanced configuration mechanism
• Automatic discovery, link training, and initialization
• Support for Active State Power Management (ASPM)
• SMBus 2.0 support
28
Product Description
• Wake# signal supporting wake events from ACPI S1, S3, S4, or S5
• Software compatible with the PCI Power Management Event (PME) mechanism
defined in the PCI Power Management Interface Specification, Rev. 1.1
1.8 IEEE-1394a Connectors (Optional)
The optional IEEE-1394 interface addresses interconnection of both computer
peripherals and consumer electronics with these features:
• IEEE-1394a operation
• Support for up to 63 peer-to-peer devices
• Operation ranging from 100 Mbits/sec to 400 Mbits/sec (depending on cable type)
• Connection over short and long distances
• Support for both asynchronous and isochronous data transfer
As a manufacturing option, the board includes two IEEE-1394a connectors as follows:
• One IEEE-1394a connector located on the back panel.
• One IEEE-1394a front-panel header located on the component side.
For information about Refer to
The location of the back panel IEEE-1394a connector Figure 18, page 57
The location of the front panel IEEE-1394a header Figure 20, page 59
The signal names of the front panel IEEE-1394a header Section 2.7.2.6, page 69
1.9 Legacy I/O Controller
The legacy 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 Conventional
bus systems
• PS/2-style mouse and keyboard interfaces
• Interface for one 1.44 MB or 2.88 MB diskette drive
• Intelligent power management, including a programmable wake-up event interface
• PCI Conventional bus power management support
The BIOS Setup program provides configuration options for the legacy I/O controller.
1.9.1 Serial Port
The board has one serial port connector located on the back panel. The serial port
supports data transfers at rates of up to 115.2 kbits/sec with BIOS support.
For information about Refer to
The location of the serial port A connector Figure 19, page 58
29
Intel Desktop Board D975XBX2 Technical Product Specification
1.9.2 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 19, page 58
1.9.3 Diskette Drive Controller
The legacy 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 on the D975XBX2 board Figure 20, page 59
1.9.4 Keyboard and Mouse Interface
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 19, page 58
30
Product Description
1.10 Audio Subsystem
The board supports the Intel High Definition audio subsystem based on the
SigmaTel 9274D or the SigmaTel 9227 audio codec. The audio subsystem supports
the following features:
• Advanced jack sense for the back panel audio jacks that enables the audio codec to
recognize the device that is connected to an audio port. The back panel audio
jacks are capable of retasking according to user’s definition, or can be
automatically switched depending on the recognized device type.
• Stereo input and output for all back panel jacks
• Line out and Mic in functions for front panel audio jacks
• A signal-to-noise (S/N) ratio of 90 dB
1.10.1 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 17
1.10.2 Audio Connectors
The board contains audio connectors and headers on both the back panel and the
component side of the board. The component-side audio connectors include the
following:
• Front panel audio (a 2 x 5-pin header that provides mic in and line out signals for
front panel audio connectors)
• ATAPI CD-ROM (an optional 1 x 4-pin ATAPI-style connector for connecting an
internal ATAPI CD-ROM drive to the audio mixer)
The functions of the back panel audio connectors are dependent on which subsystem is
present. The 8-channel (7.1) audio subsystem is described in Section 1.10.3; the
6-channel (5.1) audio subsystem is described in Section 1.10.4.
For information about Refer to
The locations of the front panel audio header and the optional ATAPI Figure 20, page 59
CD-ROM connector
The signal names of the front panel audio header Table 18, page 61
The signal names of the optional ATAPI CD-ROM connector Table 17, page 61
The back panel audio connectors Section 2.7.1, page 56
31
Intel Desktop Board D975XBX2 Technical Product Specification
1.10.3 8-Channel (7.1) Audio Subsystem
The 8-channel (7.1) audio subsystem includes the following:
• Intel 82801G I/O Controller Hub (ICH7-R/ICH7-DH)
• SigmaTel 9274D audio codec
• Microphone input that supports a single dynamic, condenser, or electret
microphone
The back panel audio connectors are configurable through the audio device drivers.
The available configurable audio ports are shown in Figure 10.
Front Panel Audio Connectors
[Routed from Front Panel Audio Header]
Mic In/Retasking Jack
Line Out/Retasking Jack
[Pink]
[Green]
Surround Left and Right/ Side Surround
Retasking Jack Left and Right/
[Black] Line In/Retasking Jack
[Blue]
Center channel and
Line Out/Retasking Jack
LFE (Subwoofer)/Retasking Jack
[Green]
[Orange]
S/PDIF Digital Audio Out Mic In/Retasking Jack
Optical [Pink]
OM18352
Figure 10. Front/Back Panel Audio Connector Options for 8-Channel (7.1)
Audio Subsystem
For information about Refer to
The back panel audio connectors Section 2.7.1, page 56
32
Product Description
1.10.4 6-Channel (5.1) Audio Subsystem
The 6-channel (5.1) audio subsystem includes the following:
• Intel 82801G I/O Controller Hub (ICH7-R/ICH7-DH)
• SigmaTel 9227 audio codec
• Microphone input that supports a single dynamic, condenser, or electret
microphone
The back panel audio connectors are configurable through the audio device drivers.
The available configurable audio ports are shown in Figure 11.
Front Panel Audio Connectors
Back Panel Audio Connectors
[Routed from Front Panel Audio Header]
Line In/Retasking Jack
[Blue]
Mic In/
Line Out/
Retasking Jack
Retasking Jack
Line Out/Retasking Jack
[Pink]
[Green]
[Green]
Mic In/Retasking Jack
[Pink]
OM18469
Figure 11. Front/Back Panel Audio Connector Options for 6-Channel (5.1)
Audio Subsystem
For information about Refer to
The back panel audio connectors Section 2.7.1, page 56
33
Intel Desktop Board D975XBX2 Technical Product Specification
1.11 LAN Subsystem
®
The LAN subsystem includes the Intel 82573 Gigabit (10/100/1000 Mbits/sec)
Ethernet Controller and an RJ-45 LAN connector with integrated status LEDs.
®
1.11.1 Intel 82573E/82573L Gigabit Ethernet
Controller
The Intel 82573E/82573L Gigabit Ethernet Controller supports the following features:
• PCI Express link
• 10/100/1000 IEEE 802.3 compliant
• Compliant to IEEE 802.3x flow control support
• Jumbo frame support
• TCP, IP, UDP checksum offload
• Transmit TCP segmentation
• Advanced packet filtering
• Full device driver compatibility
• PCI Express Power Management Support
The 82573E Gigabit Ethernet Controller supports Alert Standard Format (ASF) 2.0 and
Intel Active Management Technology (Intel AMT).
1.11.2 RJ-45 LAN Connector with Integrated LEDs
Two LEDs are built into the RJ-45 LAN connector (shown in Figure 12 below).
Link LED Data Rate LED
(Green)
(Green/Yellow)
OM18329
Figure 12. LAN Connector LED Locations
Table 6 describes the LED states when the board is powered up and the LAN
subsystem is operating.
Table 6. LAN Connector LED States
LED LED Color LED State Condition
Off LAN link is not established.
Link Green
On LAN link is established.
Blinking LAN activity is occurring.
Off 10 Mbits/sec data rate is selected.
Data Rate Green/Yellow Green 100 Mbits/sec data rate is selected.
Yellow 1000 Mbits/sec data rate is selected.
34
Product Description
1.11.3 Alert Standard Format (ASF) Support
The board provides the following ASF support for PCI Express x1 bus add-in LAN cards
and PCI Conventional bus add-in LAN cards:
• Monitoring of system firmware progress events, including:
⎯ BIOS present
⎯ Primary processor initialization
⎯ Memory initialization
⎯ Video initialization
⎯ PCI resource configuration
⎯ Hard-disk initialization
⎯ User authentication
⎯ Starting operating system boot process
• Monitoring of system firmware error events, including:
⎯ Memory missing
⎯ Memory failure
⎯ No video device
⎯ Keyboard failure
⎯ Hard-disk failure
⎯ No boot media
• Boot options to boot from different types of boot devices
• Reset, shutdown, power cycle, and power up options
• LAN Subsystem Software
LAN software and drivers are available from Intel’s World Wide Web site.
®
1.11.4 Intel Active Management Technology (Optional)
Intel Active Management Technology (Intel AMT) offers IT organizations tamper-
resistant and persistent management capabilities. Specifically, Intel AMT is a
hardware-based solution that offers encrypted and persistent asset management and
remote diagnostics and/or recovery capabilities for networked platforms. With
Intel AMT, IT organizations can easily get accurate platform information, and can
perform remote updating, diagnostics, debugging and repair of a system, regardless of
the state of the operating system and the power state of the system. Intel AMT
enables IT organizations to discover, heal, and protect all of their computing assets,
regardless of system state in the manner described below.
• Discovering hardware and software computing assets:
⎯ Intel AMT stores hardware and software asset information in non-volatile
memory and allows IT to read the asset information anytime, even if the PC is
off
⎯ Users cannot remove or prevent IT organization access to the information
because it does not rely on software agents
35
Intel Desktop Board D975XBX2 Technical Product Specification
• Healing systems remotely, regardless of the operating system or system state:
⎯ Intel AMT provides out-of-band diagnostics and recovery capabilities for IT
organizations to remotely diagnose and repair PCs after software, operating
system, or hardware failures
⎯ Alerting and event logging help IT organizations detect and diagnose problems
quickly to reduce end-user downtime
• Protecting the enterprise against malicious software attacks:
⎯ Intel AMT helps IT organizations keep software versions and virus protection
consistent and up-to-date across the enterprise
⎯ Version information is stored in non-volatile memory for access anytime by
third party software to check and, if necessary, wake a system to perform off-
hours updates.
The key features of Intel AMT include:
• Secure Out of Band (OOB) system management that allows remote management of
PCs regardless of system power or operating system state:
⎯ SSL3.1/TLS encryption
⎯ HTTP authentication
⎯ TCP/IP
⎯ HTTP web GUI
⎯ XML/SOAP API
• Remote troubleshooting and recovery that can significantly reduce desk-side visits
and potentially increasing efficiency of IT technical staff:
⎯ System event log
⎯ IDE-R or PXE boot; Network drive or remote CD boot
⎯ Serial over LAN
⎯ OOB diagnostics
⎯ Remote control
⎯ Remote BIOS update
• Proactive alerting that decreases downtime and minimizes time to repair:
⎯ Programmable policies
⎯ Operating system lock-up alert
⎯ Boot failure alert
⎯ Hardware failure alerts
• Third party non-volatile storage that prevents users from removing critical
inventory, remote control, or virus protection agents:
⎯ Nonvolatile storage for agents
⎯ Tamper-resistant
• Remote hardware and software asset tracking that eliminates time-consuming
manual inventory tracking, which also reduces asset accounting costs:
⎯ E-Asset Tag
⎯ HW/SW inventory
For information about Refer to
Intel Active Management Technology http://www.intel.com/technology/manage/iamt/index.htm
36
Product Description
1.11.5 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 17
1.12 Hardware Management Subsystem
The hardware management features enable the board to be compatible with the Wired
for Management (WfM) specification. The board has several hardware management
features, including the following:
• Fan monitoring and control (through the hardware monitoring and fan control
ASIC)
• Thermal and voltage monitoring
• Chassis intrusion detection
• Support for Product Environmental Control Interface (PECI)
1.12.1 Hardware Monitoring and Fan Control ASIC
The features of the hardware monitoring and fan control ASIC 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 VSB, +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 headers and sensors for thermal monitoring Figure 13, page 38
37
Intel Desktop Board D975XBX2 Technical Product Specification
1.12.2 Thermal Monitoring
Figure 13 shows the location of the sensors and fan headers.
Item Description
A Thermal diode, located on processor die
B Ambient temperature sensor, internal to hardware monitoring and fan control ASIC
C Remote ambient temperature sensor
D Processor fan header
E Rear chassis fan header
F Front chassis fan header
G Auxiliary chassis fan header
Figure 13. Sensors and Fan Connectors
38
Product Description
1.12.3 Fan Monitoring
Fan monitoring can be implemented using Intel Desktop Utilities or third-party
software. The level of monitoring and control is dependent on the hardware
monitoring ASIC used with the Desktop Board.
For information about Refer to
The functions of the fan headers Section 1.13.2.2, page 43
1.12.4 Chassis Intrusion and Detection
The board supports a chassis security feature that detects if the chassis cover is
removed. The security feature uses a mechanical switch on the chassis that attaches
to the chassis intrusion header. When the chassis cover is removed, the mechanical
switch is in the closed position.
1.13 Power Management
Power management is implemented at several levels, including:
• Software support through Advanced Configuration and Power Interface (ACPI)
• Hardware support:
⎯ Power connector
⎯ Fan headers
⎯ LAN wake capabilities
⎯ Instantly Available PC technology
⎯ Resume on Ring
⎯ Wake from USB
⎯ Wake from PS/2 devices
⎯ Power Management Event signal (PME#) wake-up support
⎯ PCI Express WAKE# signal support
1.13.1 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 this board requires an
operating system that provides full ACPI support. ACPI features include:
• Plug and Play (including bus and device enumeration)
• Power management control of individual devices, add-in boards (some add-in
boards may require an ACPI-aware driver), video displays, and hard disk drives
• Methods for achieving less than 15-watt system operation in the power-on/standby
sleeping state
• A Soft-off feature that enables the operating system to power-off the computer
• Support for multiple wake-up events (see Table 9 on page 42)
• Support for a front panel power and sleep mode switch
39
Intel Desktop Board D975XBX2 Technical Product Specification
Table 7 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 7. Effects of Pressing the Power Switch
If the system is in this …and the power switch is
state… pressed for …the system enters this state
Off Less than four seconds Power-on
(ACPI G2/G5 – Soft off) (ACPI G0 – working state)
On Less than four seconds Soft-off/Standby
(ACPI G0 – working state) (ACPI G1 – sleeping state)
On More than four seconds Fail safe power-off
(ACPI G0 – working state) (ACPI G2/G5 – Soft off)
Sleep Less than four seconds Wake-up
(ACPI G1 – sleeping state) (ACPI G0 – working state)
Sleep More than four seconds Power-off
(ACPI G1 – sleeping state) (ACPI G2/G5 – Soft off)
1.13.1.1 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.
40
Product Description
Table 8 lists the power states supported by the board along with the associated system
power targets. See the ACPI specification for a complete description of the various
system and power states.
Table 8. Power States and Targeted System Power
Processor Targeted System
(Note 1)
Global States Sleeping States States Device States Power
G0 – working S0 – working C0 – working D0 – working Full power > 30 W
state state.
G1 – sleeping S1 – Processor C1 – stop D1, D2, D3 – 5 W < power < 52.5 W
state stopped grant device
specification
specific.
(Note 2)
G1 – sleeping S3 – Suspend to No power D3 – no power Power < 5 W
state RAM. Context except for
saved to RAM. wake-up logic.
(Note 2)
G1 – sleeping S4 – Suspend to No power D3 – no power Power < 5 W
state disk. Context except for
saved to disk. wake-up logic.
(Note 2)
G2/S5 S5 – Soft off. No power D3 – no power Power < 5 W
Context not saved. except for
Cold boot is wake-up logic.
required.
G3 –
No power to the No power D3 – no power for No power to the system.
mechanical off system. wake-up logic, Service can be performed
except when safely.
AC power is
provided by
disconnected
battery or
from the
external 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.
41
Intel Desktop Board D975XBX2 Technical Product Specification
1.13.1.2 Wake-up Devices and Events
Table 9 lists the devices or specific events that can wake the computer from specific
states.
Table 9. Wake-up Devices and Events
These devices/events can wake up the computer… …from this state
(Note)
LAN S1, S3, S4, S5
Modem (back panel Serial Port A) S1, S3
(Note)
PME# signal S1, S3, S4, S5
Power switch S1, S3, S4, S5
PS/2 devices S1, S3
RTC alarm S1, S3, S4, S5
USB S1, S3
WAKE# S1, S3, S4, S5
Note: For LAN and PME# signal, 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.
1.13.2 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.
The board provides several power management hardware features, including:
• Power connector
• Fan headers
• LAN wake capabilities
• Instantly Available PC technology
• Resume on Ring
• Wake from USB
• Wake from PS/2 keyboard
• PME# signal wake-up support
• WAKE# signal wake-up support
LAN wake capabilities and Instantly Available PC technology require power from the
+5 V standby line.
42
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.
1.13.2.1 Power Connector
When an ACPI-enabled system receives the appropriate 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 location of the main power connector Figure 20, page 59
The signal names of the main power connector Table 24, page 63
1.13.2.2 Fan Headers
The function/operation of the fan headers is as follows:
• The fans are on when the board is in the S0 or S1 state.
• The fans are off when the board is off or in the S3, S4, or S5 state.
• Each fan header is wired to a fan tachometer input of the hardware monitoring and
fan control ASIC
• All fan headers support closed-loop fan control that can adjust the fan speed or
switch the fan on or off as needed
• All fan headers have a +12 V DC connection
For information about Refer to
The location of the fan headers Figure 20, page 59
The location of the fan headers and sensors for thermal monitoring Figure 13, page 38
The signal names of the fan headers Section 2.7.1.1, page 57
43
Intel Desktop Board D975XBX2 Technical Product Specification
1.13.2.3 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.
LAN wake capabilities enable remote wake-up of the computer through a network. The
LAN 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 board
supports LAN wake capabilities with ACPI in the following ways:
• The PCI Express WAKE# signal
• The PCI Conventional bus PME# signal for PCI 2.2 compliant LAN designs
• The onboard LAN subsystem
1.13.2.4 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.
Instantly Available PC technology enables the board 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 9 on page 42 lists the devices and events that can
wake the computer from the S3 state.
The board supports the PCI Bus Power Management Interface Specification. 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, PCI Express add-in cards, and drivers.
1.13.2.5 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
44
Product Description
1.13.2.6 Wake from USB
USB bus activity wakes the computer from ACPI S1 or S3 states.
NOTE
�
Wake from USB requires the use of a USB peripheral that supports Wake from USB.
1.13.2.7 Wake from PS/2 Devices
PS/2 device activity wakes the computer from an ACPI S1 or S3 state.
1.13.2.8 PME# Signal Wake-up Support
When the PME# signal on the PCI Conventional bus is asserted, the computer wakes
from an ACPI S1, S3, S4, or S5 state (with Wake on PME enabled in the BIOS).
1.13.2.9 WAKE# Signal Wake-up Support
When the WAKE# signal on the PCI Express bus is asserted, the computer wakes from
an ACPI S1, S3, S4, or S5 state.
1.13.2.10 +5 V Standby Power Indicator LED
The +5 V standby power indicator LED shows that power is still present even when the
computer appears to be off. Figure 14 shows the location of the standby power
indicator LED on the D975XBX2 board.
CAUTION
If AC power has been switched off and the standby power indicator is still lit,
disconnect the power cord before installing or removing any devices connected to the
board. Failure to do so could damage the board and any attached devices.
OM18534
Figure 14. Location of the Standby Power Indicator LED
45
Intel Desktop Board D975XBX2 Technical Product Specification
1.14 Onboard Power Button
CAUTION
Electrostatic discharge (ESD) can damage components. The onboard power button
should be used only at an ESD workstation using an antistatic wrist strap and a
conductive foam pad. If such a station is not available, some ESD protection can be
provided by wearing an antistatic wrist strap and attaching it to a metal part of the
computer chassis.
The board provides a power button that can be used to turn the computer on or off.
This button is intended for use at integration facilities to remove standby power before
making changes to the system configuration, or for testing purposes.
The power button on the front panel is recommended for all other instances of turning
the computer on or off. To turn the computer off using the onboard power button,
keep the button pressed down for three seconds.
Figure 15. Location of the Onboard Power Button
46
Product Description
1.15 Onboard LEDs
In addition to the standby power indicator, the board contains two LEDs that indicate
the following:
• The CPU LED indicates an elevated temperature on the processor that could effect
performance
• The VR LED indicates an elevated temperature in the processor voltage regulator
circuit that could effect performance
Figure 16 shows the locations of the LEDs.
Item Description LED Color
A CPU LED Red
B VR LED Red
Figure 16. Location of the CPU and Processor Voltage Regulator LEDs
47
Intel Desktop Board D975XBX2 Technical Product Specification
1.16 Trusted Platform Module (Optional)
The optional Trusted Platform Module (TPM) is a component on the desktop board that
is specifically designed to enhance platform security above-and-beyond the capabilities
of today’s software by providing a protected space for key operations and other
security critical tasks. Using both hardware and software, the TPM protects encryption
and signature keys at their most vulnerable stages—operations when the keys are
being used unencrypted in plain-text form. The TPM is specifically designed to shield
unencrypted keys and platform authentication information from software-based
attacks.
For information about Refer to
TPM http://www.intel.com/design/motherbd/bx2/
48
2 Technical Reference
What This Chapter Contains
2.1 Memory Resources ........................................................................... 49
2.2 DMA Channels.................................................................................. 51
2.3 Fixed I/O Map .................................................................................. 52
2.4 PCI Configuration Space Map ............................................................. 53
2.5 Interrupts........................................................................................ 54
2.6 PCI Conventional Interrupt Routing Map.............................................. 55
2.7 Connectors ...................................................................................... 56
2.8 Jumper Block ................................................................................... 70
2.9 Mechanical Considerations ................................................................. 71
2.10 Electrical Considerations.................................................................... 74
2.11 Thermal Considerations..................................................................... 76
2.12 Reliability......................................................................................... 78
2.13 Environmental.................................................................................. 79
2.1 Memory Resources
2.1.1 Addressable Memory
The board utilizes 8 GB of addressable system memory. Typically the address space
that is allocated for PCI Conventional bus add-in cards, PCI Express configuration
space, BIOS (SPI Flash device), and chipset overhead resides above the top of DRAM
(total system memory). On a system that has 8 GB of system memory installed, it is
not possible to use all of the installed memory due to system address space being
allocated for other system critical functions. These functions include the following:
• BIOS/SPI Flash device (8 Mbit)
• Local APIC (19 MB)
• Digital Media Interface (40 MB)
• Front side bus interrupts (17 MB)
• PCI Express configuration space (256 MB)
• MCH base address registers, internal graphics ranges, PCI Express ports (up to
512 MB)
• Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI
Express add-in cards
The board provides the capability to reclaim the physical memory overlapped by the
memory mapped I/O logical address space. The board remaps physical memory from
the top of usable DRAM boundary to the 4 GB boundary to an equivalent sized logical
address range located just above the 4 GB boundary. Figure 17 shows a schematic of
49
Intel Desktop Board D975XBX2 Technical Product Specification
the system memory map. All installed system memory can be used when there is no
overlap of system addresses.
8 GB
Top of System Address Space
Upper
4 GB of
address
space
FLASH
APIC
~20 MB
Reserved
PCI Memory Range -
contains PCI, chipsets,
1 MB
Direct Media Interface
0FFFFFH
(DMI), and ICH ranges
Upper BIOS
(approximately 750 MB)
area (64 KB)
0F0000H
960 KB
0EFFFFH
Lower BIOS
area
Top of usable
(64 KB;
DRAM (memory
16 KB x 4)
visible to the 0E0000H
896 KB
operating system)
0DFFFFH
Add-in Card
BIOS and
Buffer area
(128 KB;
16 KB x 8)
0C0000H
DRAM 768 KB
0BFFFFH
Range
Standard PCI/
ISA Video
Memory (SMM
1 MB
Memory)
128 KB
640 KB
0A0000H
640 KB
DOS
09FFFFH
Compatibility
DOS area
Memory
(640 KB)
00000H
0 MB 0 KB
OM18311
Figure 17. Detailed System Memory Address Map
50
Technical Reference
2.1.2 Memory Map
Table 10 lists the system memory map.
Table 10. System Memory Map
Address Range (decimal) Address Range (hex) Size Description
1024 K - 8388608 K 100000 - 1FFFFFFFF 8191 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 Potential available high DOS
memory (open to the PCI
Conventional bus). Dependent on
video adapter used.
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
2.2 DMA Channels
Table 11. 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
51
Intel Desktop Board D975XBX2 Technical Product Specification
2.3 Fixed I/O Map
Table 12. I/O Map
Address (hex) Size Description
0000 - 00FF 256 bytes Used by the Desktop Board D975XBX2. Refer to the
ICH7-R/ICH7-DH data sheet for dynamic addressing
information.
0170 - 0177 8 bytes Secondary Parallel ATA IDE channel command block
01F0 - 01F7 8 bytes Primary Parallel ATA IDE channel command block
(Note 1)
0228 - 022F 8 bytes LPT3
(Note 1)
0278 - 027F 8 bytes LPT2
(Note 1)
02E8 - 02EF 8 bytes COM4
(Note 1)
02F8 - 02FF 8 bytes COM2
0374 - 0377 4 bytes Secondary Parallel ATA IDE channel control block
0377, bits 6:0 7 bits Secondary IDE channel status port
0378 - 037F 8 bytes LPT1
03E8 - 03EF 8 bytes COM3
03F0 - 03F5 6 bytes Diskette channel
03F4 – 03F7 1 byte Primary Parallel ATA IDE channel control block
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 Conventional bus configuration address register
(Note 3)
0CF9 1 byte Reset control register
0CFC - 0CFF 4 bytes PCI Conventional bus configuration data register
FFA0 - FFA7 8 bytes Primary Parallel ATA IDE bus master registers
FFA8 - FFAF 8 bytes Secondary Parallel ATA IDE bus master registers
Notes:
1. Default, but can be changed to another address range.
2. Dword access only.
3. Byte access only.
� NOTE
Some additional I/O addresses are not available due to ICH7-R/ICH7-DH address
aliasing. The ICH7-R/ICH7-DH data sheet provides more information on address
aliasing.
For information about Refer to
Obtaining the ICH7-R/ICH7-DH data sheet Section 1.2 on page 17
52
Technical Reference
2.4 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 82975X component
00 01 00 PCI Express x16 graphics port
00 1B 00 Intel High Definition Audio controller
00 1C 00 PCI Express port 1
00 1C 01 PCI Express port 2 (Gigabit Ethernet controller
bridge)
00 1C 02 PCI Express port 3
00 1C 03 PCI Express port 4 (not used)
00 1D 00 USB UHCI controller 1
00 1D 01 USB UHCI controller 2
00 1D 02 USB UHCI controller 3
00 1D 03 USB UHCI controller 4
00 1D 07 EHCI controller
00 1E 00 PCI bridge
00 1F 00 PCI controller
00 1F 01 Parallel ATA IDE controller
00 1F 02 Serial ATA controller
00 1F 03 SMBus controller
(Note)
00 00 Gigabit Ethernet controller
(Note)
00 00 PCI Conventional bus connector 1
(Note)
01 00 PCI Conventional bus connector 2
(Note)
05 00 IEEE-1394a controller
Note: Bus number is dynamic and can change based on add-in cards used.
53
Intel Desktop Board D975XBX2 Technical Product Specification
2.5 Interrupts
The interrupts can be routed through either the Programmable Interrupt Controller
(PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the
ICH7-R/ICH7-DH component. The PIC is supported in Microsoft Windows 98 SE and
Microsoft Windows ME and uses the first 16 interrupts. The APIC is supported in
Microsoft Windows 2000 and Microsoft 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
3 User available
(Note 1)
4 COM1
5 User available
6 Diskette drive
(Note 1)
7 LPT1
8 Real-time clock
9 User available
10 User available
11 User available
12 Onboard mouse port (if present, else user available)
13 Reserved, math coprocessor
14 Primary Parallel ATA/Serial ATA – Legacy Mode (if present, else user available)
15 Secondary Parallel ATA/Serial ATA – Legacy Mode (if present, else user available)
(Note 2)
16 User available (through PIRQA)
(Note 2)
17 User available (through PIRQB)
(Note 2)
18 User available (through PIRQC)
(Note 2)
19 User available (through PIRQD)
(Note 2)
20 User available (through PIRQE)
(Note 2)
21 User available (through PIRQF)
(Note 2)
22 User available (through PIRQG)
(Note 2)
23 User available (through PIRQH)
Notes:
1. Default, but can be changed to another IRQ.
2. Available in APIC mode only.
54
Technical Reference
2.6 PCI Conventional Interrupt Routing Map
This section describes interrupt sharing and how the interrupt signals are connected
between the PCI Conventional bus connectors and onboard PCI Conventional devices.
The PCI Conventional specification describes how interrupts can be shared between
devices attached to the PCI Conventional 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 Conventional device should not share an interrupt with other PCI Conventional
devices. Use the following information to avoid sharing an interrupt with a PCI
Conventional add-in card.
PCI Conventional 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 ICH7-R/ICH7-DH has eight Programmable Interrupt Request (PIRQ) input signals.
All PCI Conventional interrupt sources either onboard or from a PCI Conventional
add-in card connect to one of these PIRQ signals. Some PCI Conventional interrupt
sources are electrically tied together on the board and therefore share the same
interrupt. Table 15 shows an example of how the PIRQ signals are routed.
Table 15. PCI Interrupt Routing Map
ICH7-R/ICH7-DH PIRQ Signal Name
PCI Interrupt Source
PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH
PCI bus connector 1 INTD INTA INTB INTC
PCI bus connector 2 INTD INTC INTA INTB
IEEE-1394a controller INTA
Discrete SATA Controller INTA
NOTE
�
In PIC mode, the ICH7-R/ICH7-DH 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.
PCI interrupt assignments to the USB ports, Serial ATA ports, and PCI Express ports
are dynamic.
55
Intel Desktop Board D975XBX2 Technical Product Specification
2.7 Connectors
CAUTION
Only the following connectors have overcurrent protection: back panel USB, front
panel USB, and PS/2.
The other internal connectors and headers 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 or headers 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 power cable, and the external devices themselves.
This section describes the board’s connectors. The connectors can be divided into
these groups:
• Back panel I/O connectors
• Component-side I/O connectors and headers (see page 59)
2.7.1 Back Panel Connectors
The back panel configuration is dependent upon which audio subsystem is present.
The configurations are as follows:
• 8-channel (7.1) audio subsystem (five analog audio output connectors and two
digital audio output connectors), described on page 57
• 6-channel (5.1) audio subsystem (three analog audio output connectors), described
on page 58
56
Technical Reference
2.7.1.1 Back Panel Connectors For 8-Channel (7.1) Audio
Subsystem
Figure 18 shows the location of the back panel connectors for boards equipped with the
8-channel (7.1) audio subsystem.
A D F H I J K
MN
B C E G L
OM18535
Item Description
PS/2 mouse port
A
PS/2 keyboard port
B
Serial port A
C
Parallel port
D
Digital audio out coaxial
E
IEEE-1394a connector
F
G USB ports (four)
LAN
H
Center channel and LFE (subwoofer) audio out/ Retasking Jack G
I
Surround left/right channel audio out/Retasking Jack H
J
Audio line in/Retasking Jack C
K
L Digital audio out optical
M Mic in/Retasking Jack B
N Front left/right channel audio out/Two channel audio line out/Retasking Jack D
Figure 18. Back Panel Connectors for 8-Channel (7.1) Audio Subsystem
NOTE
�
The back panel audio line out connector is designed to power headphones or amplified
speakers only. Poor audio quality occurs if passive (non-amplified) speakers are
connected to this output.
57
Intel Desktop Board D975XBX2 Technical Product Specification
2.7.1.2 Back Panel Connectors For 6-Channel (5.1) Audio
Subsystem
Figure 19 shows the location of the back panel connectors for boards equipped with the
6-channel (5.1) audio subsystem.
A DF G
HI
BCE
OM18536
Item Description
PS/2 mouse port
A
PS/2 keyboard port
B
Serial port A
C
Parallel port
D
E USB ports (four)
LAN
F
Audio line in/Retasking Jack C
G
H Mic in/Retasking Jack B
Front left/right channel audio out/Two channel audio line out/Retasking Jack D
I
Figure 19. Back Panel Connectors for 6-Channel (5.1) Audio Subsystem
NOTE
�
The back panel audio line out connector is designed to power headphones or amplified
speakers only. Poor audio quality occurs if passive (non-amplified) speakers are
connected to this output.
58
Technical Reference
2.7.2 Component-side Connectors and Headers
Figure 20 shows the locations of the component-side connectors and headers.
Figure 20. Component-side Connectors and Headers
Table 16 lists the component-side connectors and headers identified in Figure 20.
59
Intel Desktop Board D975XBX2 Technical Product Specification
Table 16. Component-side Connectors and Headers Shown in Figure 20
Item/callout
from Figure 20 Description
A Auxiliary rear fan header
B PCI Conventional bus add-in card connector 2
PCI Express x16 (electrical x4) bus add-in card connector
C
PCI Conventional bus add-in card connector 1
D
E Secondary PCI Express x16 (electrical x8) bus add-in card connector
F Front panel audio header
G Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector
Rear chassis fan header
H
I Auxiliary PCI Express Graphics Power connector (optional)
J ATAPI CD-ROM connector (optional)
K Processor core power connector
MCH fan header (optional)
L
Processor fan header
M
N Main power connector
O Diskette drive connector
Chassis intrusion header
P
Parallel ATA IDE connector
Q
R Serial ATA connector 3 (ICH7-R/ICH7-DH RAID)
S Serial ATA connector 2(ICH7-R/ICH7-DH RAID)
Serial ATA connector 1 (ICH7-R/ICH7-DH RAID)
T
Front chassis fan header
U
V Serial ATA connector 0 (ICH7-R/ICH7-DH RAID)
W Auxiliary front panel power LED header
Front panel USB headers
X
Front panel IEEE-1394a header [blue] (optional)
Y
Z Serial ATA connector 7 (Discrete RAID) (optional)
AA Serial ATA connector 6 (Discrete RAID) (optional)
Serial ATA connector 5 (Discrete RAID) (optional)
BB
Serial ATA RAID connector compatible with external Serial ATA adapter (optional)
CC
DD SCSI hard drive activity indicator LED header (optional)
EE Front panel header
60
Technical Reference
Table 17. ATAPI CD-ROM Connector (Optional)
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 18. Front Panel Audio Header
Pin Signal Name Pin Signal Name
1 Port E [Port 1] Left Channel 2 Ground
3 Port E [Port 1] Right Channel 4 Presence# (dongle present)
5 Port F [Port 2] Right Channel 6 Port E [Port 1] Sense return
(jack detection)
7 Port E [Port 1] and Port F [Port 2] 8 Key
Sense send (jack detection)
9 Port F [Port 2] Left Channel 10 Port F [Port 2] Sense return
(jack detection)
INTEGRATOR’S NOTE
#
The front panel audio header is colored yellow.
Table 19. Front Chassis, Rear Chassis, and MCH Fan Headers
Pin Signal Name
1 Control
2 +12 V
3 Tach
Table 20. Processor Fan and Auxiliary Rear Fan Header
Pin Signal Name
1 Ground
2 +12 V
3 FAN_TACH
4 FAN_CONTROL
61
Intel Desktop Board D975XBX2 Technical Product Specification
Table 21. Chassis Intrusion Header
Pin Signal Name
1 Intruder
2 Ground
Table 22. SCSI Hard Drive Activity LED
Header (Optional)
Pin Signal Name
1 ACT#
2 No connect
Table 23. Serial ATA Connectors
Pin Signal Name
1 Ground
2 TXP
3 TXN
4 Ground
5 RXN
6 RXP
7 Ground
62
Technical Reference
2.7.2.1 Power Supply Connectors
The board has three power supply connectors:
• Main power – a 2 x 12 connector. The board requires a power supply with a
2 x 12 main power cable.
• Processor core power – This connector provides power directly to the processor
voltage regulator and must always be used. Depending on manufacturing options,
the board will contain either a 2 x 4 or a 2 x 2 connector for the processor voltage
regulator.
• Auxiliary PCI Express graphics power – a 1 x 4 connector. This connector
provides the required additional power when using high power (75 W or greater)
add-in cards in either or both the Secondary PCI Express x16 (electrical x8) and
the PCI Express x16 (electrical x4) bus add-in card connectors.
CAUTION
Regardless of the connector type (2 x 4 or a 2 x 2), the Processor core power
connector must always be used. Failure to do so will prevent the board from booting.
If the board is equipped with a 2 x 4 power connector, you must use a power supply
with a dual-rail 2 x 4 Processor core power cable. Failure to do so may cause damage
to the board.
CAUTION
If high power (75 W or greater) add-in cards are installed in either or both the
Secondary PCI Express x16 (electrical x8) and the PCI Express x16 (electrical x4) bus
add-in card connectors, the Auxiliary PCI Express graphics power connector must be
used. Failure to do so may cause damage to the board and the add-in cards.
63
Intel Desktop Board D975XBX2 Technical Product Specification
Table 24. Main Power Connector
Pin Signal Name Pin Signal Name
1 +3.3 V 13 +3.3 V
2 +3.3 V 14 -12 V
3 Ground 15 Ground
4 +5 V 16 PS-ON# (power supply remote on/off)
5 Ground 17 Ground
6 +5 V 18 Ground
7 Ground 19 Ground
8 PWRGD (Power Good) 20 No connect
9 +5 V (Standby) 21 +5 V
10 +12 V 22 +5 V
11 +12 V 23 +5 V
12 2 x 12 connector detect 24 Ground
Table 25. Processor Core Power Connector (2 x 4 Pin)
Pin Signal Name Pin Signal Name
1 Ground 5 +12 V – Rail 1
2 Ground 6 +12 V – Rail 1
3 Ground 7 +12 V – Rail 2
4 Ground 8 +12 V – Rail 2
Table 26. Processor Core Power Connector (2 x 2 Pin)
Pin Signal Name Pin Signal Name
1 Ground 2 +12 V
2 Ground 4 +12 V
Table 27. Auxiliary PCI Express Graphics Power
Pin Signal Name
1 +12 V
2 1 x 4 connector detect
3 Ground
4 +5 V
64
Technical Reference
2.7.2.2 Add-in Card Connectors
The board has the following add-in card connectors:
• Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector; one
connector supporting simultaneous transfers up to 8 GBytes/sec
• Secondary PCI Express x16 (electrical x8) bus add-in card connector; one
connector supporting simultaneous transfers up to 4 GBytes/sec
• PCI Express x16 (electrical x4) add-in card connector; one connector supporting
simultaneous transfers up to 1 GBytes/sec. This connector can also be used for PCI
Express x1 add-in cards.
• PCI Conventional (rev 2.2 compliant) bus; two PCI Conventional bus add-in card
connectors.
Note the following considerations for the PCI Conventional bus connectors:
• All of the PCI Conventional bus connectors are bus master capable.
• SMBus signals are routed to both PCI Conventional bus connectors. This enables
PCI Conventional bus add-in boards with SMBus support to access sensor data on
the Desktop Board. The specific SMBus signals are as follows:
⎯ The SMBus clock line is connected to pin A40.
⎯ The SMBus data line is connected to pin A41.
2.7.2.3 Auxiliary Front Panel Power/Sleep LED Header
Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel
header.
Table 28. Auxiliary Front Panel Power/Sleep LED Header
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
65
Intel Desktop Board D975XBX2 Technical Product Specification
2.7.2.4 Front Panel Header
This section describes the functions of the front panel header. Table 29 lists the signal
names of the front panel header. Figure 21 is a connection diagram for the front panel
header.
Table 29. Front Panel Header
Pin Signal In/ Description Pin Signal In/ Description
Out Out
Hard Drive Activity LED Power LED
[Orange] [Green]
1 HD_PWR Out Hard disk LED pull-up 2 HDR_BLNK_ Out Front panel green
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
[Blue] [Red]
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
+5 V DC
N/C
9
87
Power Reset
Switch Switch
65
4 3 -
Hard Drive
Activity LED
2 1
+
Dual- Single-
colored colored
Power LED Power LED
OM18331
Figure 21. Connection Diagram for Front Panel Header
66
-
+
+
-
Technical Reference
2.7.2.4.1 Hard Drive Activity LED Header [Orange]
Pins 1 and 3 [Orange] 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:
• A Serial ATA hard drive connected to an onboard Serial ATA connector
• An IDE hard drive connected to an onboard IDE connector
2.7.2.4.2 Reset Switch Header [Blue]
Pins 5 and 7 [Blue] can be connected to a momentary single pole, single throw (SPST)
type switch that is normally open. When the switch is closed, the board resets and
runs the POST.
2.7.2.4.3 Power/Sleep LED Header [Green]
Pins 2 and 4 [Green] can be connected to a one- or two-color LED. Table 30 shows the
possible states for a one-color LED. Table 31 shows the possible states for a two-color
LED.
Table 30. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Green Running
Table 31. States for a Two-Color Power LED
LED State Description
Off Power off
Steady Green Running
Steady Yellow Sleeping
� NOTE
The colors listed in Table 30 and Table 31 are suggested colors only. Actual LED colors
are product- or customer-specific.
2.7.2.4.4 Power Switch Header [Red]
Pins 6 and 8 [Red] 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 board.) At least two seconds must pass before the power
supply will recognize another on/off signal.
67
Intel Desktop Board D975XBX2 Technical Product Specification
2.7.2.5 Front Panel USB Headers
Figure 22 is a connection diagram for the front panel USB headers.
INTEGRATOR’S NOTES
#
• The +5 V DC power on the USB headers is fused.
• Pins 1, 3, 5, and 7 comprise one USB port.
• Pins 2, 4, 6, and 8 comprise one USB port.
• Use only a front panel USB connector that conforms to the USB 2.0 specification for
high-performance USB devices.
Power Power
1 2
(+5 V DC) (+5 V DC)
D- D-
One One
3 4
USB USB
Port Port
D+ D+
5 6
Ground
7 8
Ground
10
Key (no pin)
No connect
OM18317
Figure 22. Connection Diagram for Front Panel USB Headers
68
Technical Reference
2.7.2.6 Front Panel IEEE 1394a Header (Optional)
Figure 23 is a connection diagram for the IEEE 1394a header.
TPA+
1 2 TPA-
Ground 3 4 Ground
TPB+
5 6 TPB-
+12 V DC
7 8 +12 V DC
Key (no pin)
Ground
10
OM18316
Figure 23. Connection Diagram for Front Panel IEEE 1394a Header
INTEGRATOR’S NOTES
#
• The IEEE 1394a header is blue.
• The +12 V DC power on the IEEE 1394a header is fused.
• The IEEE 1394a header provides one IEEE 1394a port.
69
Intel Desktop Board D975XBX2 Technical Product Specification
2.8 Jumper Block
CAUTION
Do not move the jumper with the power on. Always turn off the power and unplug the
power cord from the computer before changing a jumper setting. Otherwise, the board
could be damaged.
Figure 24 shows the location of the jumper block. The 3-pin jumper block determines
the BIOS Setup program’s mode. Table 32 describes the jumper settings for the three
modes: normal, configure, and recovery. When the jumper is set to configure 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.
Figure 24. Location of the Jumper Block
Table 32. BIOS Setup Configuration Jumper Settings
Function/Mode Jumper Setting Configuration
Normal 1-2 The BIOS uses current configuration information and
passwords for booting.
32 1
Configure 2-3 After the POST runs, Setup runs automatically. The
maintenance menu is displayed.
32 1
Recovery None The BIOS attempts to recover the BIOS configuration. A
recovery diskette is required.
32 1
70
Technical Reference
2.9 Mechanical Considerations
2.9.1 Form Factor
The board is designed to fit into an ATX-form-factor chassis. Figure 25 illustrates the
mechanical form factor for the board. Dimensions are given in inches [millimeters].
The outer dimensions are 12.00 inches by 9.60 inches [304.80 millimeters by
243.84 millimeters]. Location of the I/O connectors and mounting holes are in
compliance with the ATX specification.
Figure 25. Board Dimensions
71
Intel Desktop Board D975XBX2 Technical Product Specification
2.9.2 I/O Shield
The back panel I/O shield for the board must meet specific dimension and material
requirements. Systems based on this board need the back panel I/O shield to pass
certification testing. Figure 26 shows the I/O shield for boards with the 8-channel
(7.1) audio subsystem. Figure 27 shows the I/O shield for boards with the 6-channel
(5.1) audio subsystem. Dimensions are given in inches to a tolerance of ±0.02 inches.
The figures also indicate the position of each cutout. Additional design considerations
for I/O shields relative to chassis requirements are described in the ATX specification.
NOTE
�
The I/O shield drawings in this document are for reference only. I/O shields compliant
with the ATX chassis specification are available from Intel.
162.3 REF
[6.390]
1.6 – 0.12
[0.063 – 0.005]
20 – 0.254 TYP
[0.787 – 0.10]
159.2 – 0.12
1.55 REF
[0.061]
[6.268 – 0.005]
22.45
[0.884]
8x R 0.5 MIN
7.01
[0.276]
1.00
[0.039] A
A
0.00
11.81
[0.00]
[0.465]
11.81
14.17
[0.465]
[0.558]
12.04
[0.474]
12.81
[0.504]
Pictorial
View
OM18540
Figure 26. I/O Shield Dimensions for Boards with the 8-Channel (7.1)
Audio Subsystem
72
0.00
[0.00]
8.81
[0.347]
20.28
[0.799]
26.91
[1.059]
61.54
[2.423]
93.74
[3.690]
113.63
[4.473]
146.88
[5.783]
Technical Reference
162.3 REF
[6.390]
1.6 – 0.12
[0.063 – 0.005]
20 – 0.254 TYP
[0.787 – 0.10]
1.55 REF 159.2 – 0.12
[0.061]
[6.268 – 0.005]
22.45
[0.884]
8x R 0.5 MIN
7.012
[0.276]
1.00
[0.039]
A
A
0.00
11.81
[0.00]
[0.465]
11.811
14.17
[0.465]
[0.558]
12.04
[0.474]
Pictorial
View
OM18541
Figure 27. I/O Shield Dimensions for Boards with the 6-Channel (5.1)
Audio Subsystem
73
0.00
[0.00]
8.805
[0.347]
20.283
[0.799]
26.911
[1.059]
93.74
[3.690]
113.63
[4.473]
146.88
[5.783]
Intel Desktop Board D975XBX2 Technical Product Specification
2.10 Electrical Considerations
2.10.1 DC Loading
Table 33 lists the DC loading characteristics of the board. This data is based on a DC
analysis of all active components within the board that impact its power delivery
subsystems. The analysis does not include PCI add-in cards. Minimum values assume
a light load placed on the board that is similar to an environment with no applications
running and no USB current draw. Maximum values assume a load placed on the
board that is similar to a heavy gaming environment with a 500 mA current draw per
USB port. These calculations are not based on specific processor values or memory
configurations but are based on the minimum and maximum current draw possible
from the board’s power delivery subsystems to the processor, memory, and USB ports.
Use the datasheets for add-in cards, such as PCI, to determine the overall system
power requirements. The selection of a power supply at the system level is dependent
on the system’s usage model and not necessarily tied to a particular processor clock
frequency.
Table 33. DC Loading Characteristics
DC Current at:
Mode DC Power +3.3 V +5 V +12 V -12 V +5 VSB
Minimum loading 300 W 5 A 11 A 19 A 0 A 0.34 A (S0)
1.25 A (S3)
Maximum loading 750 W 25 A 27 A 46 A 0.40 A 0.34 A (S0)
1.25 A (S3)
2.10.2 Add-in Board Considerations
The board 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 the desktop board is as follows: a
fully loaded board (all five expansion slots) must not exceed 10 A.
74
Technical Reference
2.10.3 Fan Header Current Capability
CAUTION
The processor fan must be connected to the processor fan header, not to a chassis fan
header. Connecting the processor fan to a chassis fan header may result in onboard
component damage that will halt fan operation.
Table 34 lists the current capability of the fan headers.
Table 34. Fan Header Current Capability
Fan Connector Maximum Available Current
Processor fan 3.0 A
Front chassis fan 1.5 A
Rear chassis fan 1.5 A
Auxiliary rear fan 3.0 A
MCH fan (optional) 1.5 A
2.10.4 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.
System integrators should refer to the power usage values listed in Table 33 when
selecting a power supply for use with the board.
Additional power required will depend on configurations chosen by the integrator.
The power supply must comply with the following recommendations found in the ATX
form factor specification.
• The potential relation between 3.3 VDC and +5 VDC power rails
• The current capability of the +5 VSB line
• All timing parameters
• All voltage tolerances
75
Intel Desktop Board D975XBX2 Technical Product Specification
2.11 Thermal Considerations
This board features a thermal protection circuit in the processor voltage regulator area.
This circuit protects the processor voltage regulator from overheating and damaging
the board. The thermal protection circuit in the processor voltage regulator sensor is
o
triggered at approximately 120 C. This trigger will cause the processor to enter a
throttling mode (slowing down the processor if it exceeds its maximum operating
temperature) and allow the processor voltage regulator to cool down.
INTEGRATOR’S NOTE
#
Use a processor heatsink that provides omni-directional airflow to maintain required
airflow across the processor voltage regulator area.
CAUTION
When using BIOS Setup program options to increase processor voltage and frequency
above the supported ranges, the temperature in the processor voltage regulator area
will rise. This area of the board will require increased airflow. Direct airflow over the
processor voltage regulator is crucial to preventing throttling and keeping the
processor voltage regulator area cool. This is particularly important when using liquid
cooling.
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.
Figure 28 shows the locations of the localized high temperature zones.
76
Technical Reference
Item Description
A Intel 82801G ICH7-R/ICH7-DH
B Intel 82975X MCH
C Processor voltage regulator area
D Processor
Figure 28. Localized High Temperature Zones
CAUTION
Ensure that the ambient temperature does not exceed the board’s maximum operating
temperature. Failure to do so could cause components to exceed their maximum case
temperature and malfunction. For information about the maximum operating
temperature, see the environmental specifications in Section 2.13.
77
Intel Desktop Board D975XBX2 Technical Product Specification
Table 35 provides maximum case temperatures for the components that are sensitive
to thermal changes. The operating temperature, current load, or operating frequency
could affect case temperatures. Maximum case temperatures are important when
considering proper airflow to cool the board.
Table 35. Thermal Considerations for Components
Component Temperature
o
Intel 82801G ICH7-R/ICH7-DH 110 C (under bias)
o
Intel 82975X MCH 99 C (under bias)
Processor For processor case temperature, see processor datasheets and
processor specification updates
o
Processor voltage regulator area 120 C (under bias)
NOTE
�
o
For hardware monitoring application software, an alert point of 110 C is recommended
as a starting point for the processor voltage regulator area.
For information about Refer to
Intel Pentium 4 processor datasheets and specification updates Section 1.2, page 17
2.12 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 for the board is
99,721 hours.
78
Technical Reference
2.13 Environmental
Table 36 lists the environmental specifications for the board.
Table 36. 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/second²
Packaged Half sine 2 millisecond
Product Weight (pounds) Free Fall (inches) Velocity Change (inches/sec²)
<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 5 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
79
Intel Desktop Board D975XBX2 Technical Product Specification
80
3 Overview of BIOS Features
What This Chapter Contains
3.1 Introduction..................................................................................... 81
3.2 Resource Configuration ..................................................................... 82
3.3 System Management BIOS (SMBIOS) ................................................. 83
3.4 Watchdog Timer ............................................................................... 83
3.5 Legacy USB Support ......................................................................... 84
3.6 BIOS Updates .................................................................................. 84
3.7 Boot Options.................................................................................... 85
3.8 BIOS Security Features ..................................................................... 87
3.1 Introduction
The BIOS is stored in the Serial Peripheral Interface (SPI) Flash device and can be
updated using a disk-based program. The SPI 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 BIOSs are identified as BX97520J.86A.
When the BIOS Setup configuration jumper is set to configure 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.
The BIOS Setup program can be used to view and change the BIOS settings for the
computer. The BIOS Setup program is accessed by pressing the
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