Intel DESKTOP BOARD D955XBK, BLKD955XBKLKR - 10PK 955X LGA775 8GB DDR2 16X, BOXD955XBKLKR - Motherboard 955X Express Chip ATX User Manual
Intel® Desktop Board
D955XBK
Technical Product Specification
The Intel® Desktop Board D955XBK 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 D955XBK Specification Update.
April 2005
Order Number: D14065-001
Revision History
Revision Revision History Date
-001 First release of the Intel® Desktop Board D955XBK Technical Product
Specification
April 2005
This product specification applies to only the standard Intel
®
Desktop Board D955XBK with BIOS
identifier BK95510J.86A.
Changes to this specification will be published in the Intel Desktop Board D955XBK 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
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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
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embedded non-PC applications or other environments, such as medical, industrial, alarm systems, test equipment, etc. may
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intellectual property rights.
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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.
®
PRODUCTS INCLUDING LIABILITY OR WARRANTIES
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
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Copyright © 2005, 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
describes the standard product and available manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Intel Desktop Board
D955XBK 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 D955XBK
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
®
Desktop Board D955XBK. It
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.
WARNING
Warnings indicate conditions, which if not observed, can cause personal injury.
iii
Intel Desktop Board D955XBK 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 D955XBK, 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......................................................................................................................10
1.1.1 Feature Summary..........................................................................................10
1.1.2 Manufacturing Options ..................................................................................11
1.1.3 Board Layout.................................................................................................12
1.1.4 Block Diagram...............................................................................................14
1.2 Online Support.............................................................................................................15
1.3 Processor.....................................................................................................................15
1.4 System Memory...........................................................................................................16
1.4.1 Memory Configurations .................................................................................17
1.5 Intel® 955X Chipset......................................................................................................21
1.5.1 USB...............................................................................................................21
1.5.2 IDE Support...................................................................................................21
1.5.3 Real-Time Clock, CMOS SRAM, and Battery................................................23
1.6 Discrete Serial ATA Interface (Optional)......................................................................24
1.7 PCI Express Connectors..............................................................................................24
1.8 Auxiliary Power (AUX PWR) Output Connector (Optional)..........................................25
1.9 IEEE-1394a/b Connectors (Optional)...........................................................................25
1.10 I/O Controller................................................................................................................26
1.10.1 Serial Port......................................................................................................26
1.10.2 Parallel Port...................................................................................................26
1.10.3 Diskette Drive Controller................................................................................26
1.10.4 Keyboard and Mouse Interface .....................................................................26
1.11 Audio Subsystem.........................................................................................................27
1.11.1 Audio Subsystem Software ...........................................................................27
1.11.2 Audio Connectors..........................................................................................27
1.11.3 8-Channel (7.1) Audio Subsystem.................................................................28
1.11.4 6-Channel (5.1) Audio Subsystem.................................................................30
1.12 LAN Subsystem ...........................................................................................................31
1.12.1 Intel® 82573E/82573V/82574V Gigabit Ethernet Controller..........................31
1.12.2 RJ-45 LAN Connector with Integrated LEDs.................................................31
1.12.3 Alert Standard Format (ASF) Support...........................................................32
1.12.4 Intel® Active Management Technology (AMT) (Optional)..............................32
1.12.5 LAN Subsystem Software..............................................................................34
1.13 Hardware Management Subsystem.............................................................................34
1.13.1 Hardware Monitoring and Fan Control ASIC.................................................34
1.13.2 Thermal Monitoring........................................................................................35
1.13.3 Fan Monitoring...............................................................................................36
1.13.4 Chassis Intrusion and Detection....................................................................36
1.14 Power Management.....................................................................................................36
1.14.1 ACPI..............................................................................................................36
1.14.2 Hardware Support .........................................................................................39
1.15 Trusted Platform Module (Optional).............................................................................43
v
Intel Desktop Board D955XBK Technical Product Specification
2 Technical Reference
2.1 Memory Resources......................................................................................................45
2.1.1 Addressable Memory.....................................................................................45
2.1.2 Memory Map..................................................................................................47
2.2 DMA Channels.............................................................................................................47
2.3 Fixed I/O Map...............................................................................................................48
2.4 PCI Configuration Space Map......................................................................................49
2.5 Interrupts......................................................................................................................50
2.6 PCI Conventional Interrupt Routing Map .....................................................................51
2.7 Connectors...................................................................................................................53
2.7.1 Back Panel Connectors.................................................................................53
2.7.2 Component-side Connectors.........................................................................56
2.8 Jumper Block ...............................................................................................................67
2.9 Mechanical Considerations..........................................................................................68
2.9.1 Form Factor...................................................................................................68
2.9.2 I/O Shield.......................................................................................................69
2.10 Electrical Considerations..............................................................................................71
2.10.1 DC Loading....................................................................................................71
2.10.2 Add-in Board Considerations.........................................................................71
2.10.3 Fan Connector Current Capability.................................................................72
2.10.4 Power Supply Considerations .......................................................................72
2.11 Thermal Considerations...............................................................................................73
2.12 Reliability......................................................................................................................75
2.13 Environmental..............................................................................................................76
2.14 Regulatory Compliance................................................................................................77
2.14.1 Safety Regulations ........................................................................................77
2.14.2 EMC Regulations...........................................................................................77
2.14.3 European Union Declaration of Conformity Statement..................................78
2.14.4 Recycling Considerations..............................................................................79
2.14.5 Product Certification Markings (Board Level)................................................80
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 Legacy USB Support....................................................................................................83
3.5 BIOS Updates..............................................................................................................84
3.5.1 Language Support.........................................................................................84
3.5.2 Custom Splash Screen..................................................................................84
3.6 Boot Options ................................................................................................................85
3.6.1 CD-ROM Boot ...............................................................................................85
3.6.2 Network Boot.................................................................................................85
3.6.3 Booting Without Attached Devices................................................................85
3.6.4 Changing the Default Boot Device During POST..........................................85
vi
3.7 Fast Booting Systems with Intel® Rapid BIOS Boot.....................................................86
3.7.1 Peripheral Selection and Configuration.........................................................86
3.7.2 Intel Rapid BIOS Boot ...................................................................................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
Figures
1. Desktop Board Components........................................................................................12
2. Block Diagram..............................................................................................................14
3. Memory Channel and DIMM Configuration..................................................................17
4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs ..............................18
5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs............................18
6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs..............................19
7. Single Channel (Asymmetric) Mode Configuration with One DIMM.............................20
8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs........................20
9. Front/Back Panel Audio Connector Options for 8-Channel (7.1) Audio Subsystem....28
10. 8-channel (7.1) Audio Subsystem Block Diagram........................................................29
11. Front/Back Panel Audio Connector Options for 6-Channel (5.1) Audio Subsystem....30
12. 6-Channel (5.1) Audio Subsystem Block Diagram.......................................................30
13. LAN Connector LED Locations....................................................................................31
14. Sensors and Fan Connectors ......................................................................................35
15. Location of the Standby Power Indicator LED .............................................................42
16. Detailed System Memory Address Map.......................................................................46
17. Back Panel Connectors for 8-Channel (7.1) Audio Subsystem ...................................54
18. Back Panel Connectors for 6-Channel (5.1) Audio Subsystem ...................................55
19. D955XBK Component-side Connectors.......................................................................56
20. Connection Diagram for Front Panel Connector..........................................................63
21. Connection Diagram for Front Panel USB Connectors................................................65
22. Connection Diagram for Front Panel IEEE 1394a/b Connectors.................................66
23. Location of the Jumper Block.......................................................................................67
24. Board Dimensions........................................................................................................68
25. I/O Shield Dimensions for Boards with the 8-Channel (7.1) Audio Subsystem............69
26. I/O Shield Dimensions for Boards with the 6-Channel (5.1) Audio Subsystem............70
27. Example of a Processor Heatsink for Omni-directional Airflow....................................73
28. Localized High Temperature Zones.............................................................................74
Contents
Tables
1. Feature Summary ........................................................................................................10
2. Manufacturing Options.................................................................................................11
3. Components Shown in Figure 1...................................................................................13
4. Supported Memory Configurations ..............................................................................16
vii
Intel Desktop Board D955XBK Technical Product Specification
5. LAN Connector LED States .........................................................................................31
6. Effects of Pressing the Power Switch ..........................................................................37
7. Power States and Targeted System Power .................................................................38
8. Wake-up Devices and Events......................................................................................39
9. System Memory Map ...................................................................................................47
10. DMA Channels.............................................................................................................47
11. I/O Map ........................................................................................................................48
12. PCI Configuration Space Map......................................................................................49
13. Interrupts......................................................................................................................50
14. PCI Interrupt Routing Map ...........................................................................................52
15. Back Panel Connectors Shown in Figure 17................................................................54
16. Back Panel Connectors Shown in Figure 18................................................................55
17. Component-side Connectors Shown in Figure 19 .......................................................57
18. ATAPI CD-ROM Connector (Optional).........................................................................58
19. Front Panel Audio Connector.......................................................................................58
20. Front Chassis Fan and Rear Chassis Fan Connectors...............................................58
21. Processor Fan Connector and Auxiliary Rear Fan Connector....................................58
22. Chassis Intrusion Connector........................................................................................59
23. SCSI Hard Drive Activity LED Connector (Optional)....................................................59
24. Serial ATA Connectors.................................................................................................59
25. Auxiliary Power Output Connector...............................................................................59
26. Main Power Connector.................................................................................................61
27. Processor Power Connector (2 x 4 Pin).......................................................................61
28. Processor Power Connector (2 x 2 Pin).......................................................................61
29. Alternate Power Connector..........................................................................................61
30. Auxiliary Front Panel Power/Sleep LED Connector.....................................................62
31. Front Panel Connector.................................................................................................63
32. States for a One-Color Power LED..............................................................................64
33. States for a Two-Color Power LED..............................................................................64
34. BIOS Setup Configuration Jumper Settings.................................................................67
35. DC Loading Characteristics .........................................................................................71
36. Fan Connector Current Capability................................................................................72
37. Thermal Considerations for Components ....................................................................75
38. Environmental Specifications.......................................................................................76
39. Safety Regulations.......................................................................................................77
40. EMC Regulations.........................................................................................................77
41. Product Certification Markings.....................................................................................80
42. BIOS Setup Program Menu Bar...................................................................................82
43. BIOS Setup Program Function Keys............................................................................82
44. Boot Device Menu Options ..........................................................................................85
45. Supervisor and User Password Functions...................................................................87
46. Beep Codes .................................................................................................................89
47. BIOS Error Messages..................................................................................................89
48. Port 80h POST Code Ranges......................................................................................90
49. Port 80h POST Codes .................................................................................................91
50. Typical Port 80h POST Sequence...............................................................................94
viii
1 Product Description
What This Chapter Contains
1.1 Overview......................................................................................................................10
1.2 Online Support.............................................................................................................15
1.3 Processor.....................................................................................................................15
1.4 System Memory...........................................................................................................16
1.5 Intel® 955X Chipset......................................................................................................21
1.6 Discrete Serial ATA Interface (Optional)......................................................................24
1.7 PCI Express Connectors..............................................................................................24
1.8 Auxiliary Power (AUX PWR) Output Connector (Optional)..........................................25
1.9 IEEE-1394a/b Connectors (Optional)...........................................................................25
1.10 I/O Controller................................................................................................................26
1.11 Audio Subsystem.........................................................................................................27
1.12 LAN Subsystem ...........................................................................................................31
1.13 Hardware Management Subsystem.............................................................................34
1.14 Power Management.....................................................................................................36
1.15 Trusted Platform Module (Optional).............................................................................43
9
Intel Desktop Board D955XBK Technical Product Specification
1.1 Overview
1.1.1 Feature Summary
Table 1 summarizes the major features of the board.
Table 1. Feature Summary
Form Factor
Processor
Memory
Chipset
Video
Audio
I/O Control
USB
Peripheral
Interfaces
BIOS
Instantly Available
PC Technology
LAN Support
Expansion
Capabilities
ATX (12.00 inches by 9.60 inches [304.80 millimeters by 243.84 millimeters])
Support for an Intel® Pentium® 4 processor in an LGA775 socket with a 1066 or
800 MHz system bus
• Four 240-pin DDR2 SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for 667 and 533 MHz DDR2 DIMMs
• Support for up to 8 GB of system memory
• Support for ECC and non-ECC memory
®
955X Chipset, consisting of:
Intel
®
• Intel
• Intel® 82801GR I/O Controller Hub (ICH7-R)
• Firmware Hub (FWH) or Serial Peripheral Interface (SPI) Flash device
One PCI Express* x16 connector supporting PCI Express x16 graphics cards
Intel
LPC Bus I/O controller
Support for USB 2.0 devices
• 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
• Intel
• Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
• 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
Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the
Intel
• Three PCI Conventional bus add-in card connectors (SMBus routed to PCI
• One PCI Express x16 bus add-in card connector
• One Secondary PCI Express x16/x4 bus add-in card connector
• One PCI Express x1 bus add-in card connector
82955X Memory Controller Hub (MCH)
®
High Definition Audio subsystem
®
BIOS (resident in the FWH or SPI Flash device)
SMBIOS, and Intel
®
82573E/82573V/82574V Gigabit Ethernet Controller
Conventional bus connector 2)
®
Active Management Technology (AMT)
continued
10
Product Description
Table 1. Feature Summary (continued)
Hardware Monitor
Subsystem
• Hardware monitoring and fan control ASIC
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• Three fan connectors
• Three fan sense inputs used to monitor fan activity
• Fan speed control
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
Alternate (ALT)
Power Input
Connector
ATAPI CD-ROM
connector
Audio Subsystem
Auxiliary (AUX)
Power Output
Connector
Discrete SATA
RAID controller
IEEE-1394a/b
Interface
Processor power
connector
SCSI Hard Drive
Activity LED
Connector
Trusted Platform
Module (TPM)
For information about Refer to
Available configurations for the board Section 1.2, page 15
Provides required additional power when using high power (75 W or greater) add-in
cards in both the PCI Express x16 and the Secondary PCI Express x16/x4 bus add-in
card connectors
A 1 x 4-pin ATAPI-style connector for connecting an internal ATAPI CD-ROM drive to
the audio mixer
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 9221 audio codec
• 6-channel (5.1) audio subsystem with three analog audio outputs using the
Sigmatel 9220 audio codec
Provides power for internal chassis lighting
• Silicon Image Sil 3114 SATA RAID controller
• Four SATA connectors (in addition to the four SATA connectors on the ICH7-R
SATA interface)
IEEE-1394a/b controller and three IEEE-1394a/b connectors: one back panel
connector, two front-panel connectors. Back panel connector is IEEE-1394acompatible only; front panel connectors are 1394a- or 1394b-compatible, configurable
through the BIOS Setup program.
One of the following connectors for providing +12 V power to the processor voltage
regulator:
• 2 x 4-pin (requires a power supply with a dual-rail 2 x 4 power cable)
• 2 x 2-pin
Allows add-in hard drive controllers (SCSI or other) to use the same LED as the
onboard IDE controller.
A component that enhances platform security
11
Intel Desktop Board D955XBK Technical Product Specification
1.1.3 Board Layout
Figure 1 shows the location of the major components.
OO
NN
MM
LL
KK
JJ
HH
F GAPB D
HC E
I
J
K
L
M
N
II
O
Q
Y
AAGG EE CC
W
XZBBDDFF
V
Figure 1. Desktop Board Components
Table 3 lists the components identified in Figure 1.
12
S RTU
OM17719
Table 3. Components Shown in Figure 1
Item/callout from Figure 1 Description
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA
BB
CC
DD
EE
FF
GG
HH
II
JJ
KK
LL
MM
NN
OO
Auxiliary rear fan connector
ATAPI CD-ROM connector (optional)
Audio codec
Front panel audio connector
Secondary PCI Express x16/x4 bus add-in card connector
Gigabit Ethernet Controller
PCI Express x16 bus add-in card connector
Back panel connectors
Processor power connector
Alternate power connector (optional)
Rear chassis fan connector
LGA775 processor socket
Intel 82955X MCH
Processor fan connector
Intel 82801GR I/O Controller Hub (ICH7-R)
DIMM Channel A sockets [2]
DIMM Channel B sockets [2]
I/O controller
Power connector
Diskette drive connector
Parallel ATE IDE connector
Battery
Front chassis fan connector
BIOS Setup configuration jumper block
Firmware Hub (FWH)
Chassis intrusion connector
Serial ATA connectors (ICH7-R RAID) [4]
Front panel USB connectors [2]
Auxiliary front panel power LED connector
Front panel connector
SCSI Hard Drive Activity LED (optional)
Auxiliary power output connector (optional)
Serial ATA RAID controller (Discrete RAID) (optional)
Serial ATA RAID connectors (Discrete RAID) (optional) [4]
IEEE-1394a/b front panel connectors [2]
IEEE-1394a/b PHY component (optional)
IEEE-1394a/b Link component (optional)
SPI Flash device
PCI Conventional bus add-in card connectors [3]
Speaker
PCI Express x1 bus add-in card connector
Product Description
13
Intel Desktop Board D955XBK Technical Product Specification
1.1.4 Block Diagram
Figure 2 is a block diagram of the major functional areas of the board.
PCI Express x1 Slot
Secondary PCI
Express x16/x4 Slot
Parallel ATA
IDE Connector
LGA775
Processor Socket
PCI Express
x16 Interface
PCI Express
x16
Connector
Channel A
DIMMs (2)
PCI Express Interface
System Bus
(1066/800 MHz)
Intel 82955X
Memory Controller
Hub (MCH)
SMBus
Dual-Channel
Memory Bus
Parallel ATA
IDE Interface
SMBus
SMBus
Gigabit Ethernet
Controller
USB
LPC Bus
I/O
Controller
LPC Bus
Intel 82801GR
I/O Controller Hub
(ICH7-R)
DMI Interconne ct
Back Panel/Front Panel
USB Ports
Serial Port
Parallel Port
PS/2 Mouse
PS/2 Keyboard
Diskette Drive
LAN
Connector
Connector
Firmware
Hub (FWH)
-- or --
SPI Flash
Device
Intel 955X Chipset
LPC Bus
TPM Component
(Optional)
Channel B
DIMMs (2)
IEEE-1394a/b Connectors
(Optional)
SATA RAID
Connectors (4)
(Optional)
PCI Slot 1
PCI Slot 2
PCI Slot 3
IEEE-1394a/b
Controller
(Optional)
Discrete SATA RAID
Controller
(Optional)
PCI Bus
SMBus
Hardware Monitoring
and Fan Control ASIC
Figure 2. Block Diagram
PCI
Bus
PCI
Bus
High Definition Audio Link
SATA IDE
Interface
Front Panel Mic In
Front Panel Line Out
Mic In/Retasking Jack
Line In/Retasking Jack
Audio
Codec
Surround Left-Right/Retasking Jack
Line Out/Retasking Jack
CD-ROM (Optional)
Center and LFE/Retasking Jack
Connectors (4)
S/PDIF
SATA IDE
OM17557
14
Product Description
1.2 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board D955XBK under
“Desktop Board Products” or “Desktop
Board Support”
Available configurations for the Desktop
Board D955XBK
Processor data sheets http://www.intel.com/design/litcentr
ICH7-R 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
http://www.intel.com/design/motherbd
http://support.intel.com/support/motherboards/desktop
http://developer.intel.com/design/motherbd/bk/bk_available.htm
1.3 Processor
The board is designed to support Intel Pentium 4 processors in an LGA775 processor socket with a
1066 or 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/bk/bk_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 60 for information on power supply requirements for this board.
15
Intel Desktop Board D955XBK 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 45 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 667 and 533 MHz SDRAM DIMMs
NOTES
• Remove the PCI Express x16 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
Capacity
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.
INTEGRATOR’S NOTE
#
Configuration
(Note 1)
SDRAM
Density
SDRAM Organization
Front-side/Back-side
Number of SDRAM
Devices
(Note 2)
Refer to Section 2.1.1, on page 45 for additional information on available memory.
16
Product Description
1.4.1 Memory Configurations
The Intel 82955X 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
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17720
17
Intel Desktop Board D955XBK Technical Product Specification
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.
1 GB
Channel A, DIMM 0
Channel A, DIMM 1
1 GB
Channel B, DIMM 0
Channel B, DIMM 1
OM17123
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.
256 MB
256 MB
512 MB
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
Figure 5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs
18
OM17122
Product Description
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.
256 MB
512 MB
256 MB
512 MB
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17124
Figure 6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs
19
Intel Desktop Board D955XBK Technical Product Specification
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.
256 MB
Figure 7. Single Channel (Asymmetric) Mode Configuration with One DIMM
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17125
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.
256 MB
512 MB
512 MB
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
Figure 8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs
20
OM17126
Product Description
1.5 Intel® 955X Chipset
The Intel 955X chipset consists of the following devices:
• Intel 82955X Memory Controller Hub (MCH) with Direct Media Interface (DMI) interconnect
• Intel 82801GR I/O Controller Hub (ICH7-R) with DMI interconnect
• BIOS storage in one of the following:
⎯ Firmware Hub (FWH)
⎯ Serial Peripheral Interface (SPI) Flash device
The MCH is a centralized controller for the system bus, the memory bus, the PCI Express bus, and
the DMI interconnect. The ICH7-R is a centralized controller for the board’s I/O paths.
For information about Refer to
The Intel 955X 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 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 connectors
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 18, page 55
The location of the front panel USB connectors Figure 19, page 56
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’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.
21
Intel Desktop Board D955XBK Technical Product Specification
• 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’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 19, page 56
1.5.2.2 Serial ATA Interfaces
The ICH7-R’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. Native mode is the preferred mode for configurations
using the Windows* XP and 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 D955XBK board Figure 19, page 56
22
Product Description
1.5.2.3 Serial ATA RAID
The ICH7-R supports the following RAID (Redundant Array of Independent Drives) levels:
• RAID 0 - data striping. Multiple physical drives can be teamed together to create one logical
drive. As data is written or retrieved from the logical drive, both drives operate in parallel, thus
increasing the throughput. The ICH7-R allows for more than two drives to be used in a
RAID 0 configuration.
• RAID 1 - data mirroring. Multiple physical drives maintain duplicate sets of all data on
separate disk drives. Level 1 provides the highest data reliability because two complete copies
of all information are maintained. The ICH7-R allows for two or four drives to be used in a
RAID 1 configuration.
• RAID 0+1 (or RAID 10) - data striping and mirroring. RAID 0+1 combines multiple mirrored
drives (RAID 1) with data striping (RAID 0) into a single array. This provides the highest
performance with data protection. Data is striped across all mirrored sets. RAID 0+1 utilizes
several drives to stripe data (increased performance) and then makes a copy of the striped
drives to provide redundancy. The mirrored disks eliminate the overhead and delay of parity.
• RAID 5 - distributed parity. RAID Level 5 stripes data at a block level across several drives
and distributes parity among the drives; no single disk is devoted to parity. Because parity data
is distributed on each drive, read performance tends to be lower than other RAID types.
RAID 5 requires the use of three or four drives.
1.5.2.4 SCSI Hard Drive Activity LED Connector (Optional)
The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in
hard drive controller to use the same LED as the onboard IDE controller. For proper operation, this
connector should be wired to the LED output of the add-in hard drive controller. The LED
indicates when data is being read from, or written to, 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 connector Figure 19, page 56
The signal names of the SCSI hard drive activity LED connector Table 23, page 59
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.
23
Intel Desktop Board D955XBK Technical Product Specification
1.6 Discrete Serial ATA Interface (Optional)
As a manufacturing option, the board provides a Silicon Image Sil 3114 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 SATA interface.
The Sil 3114 controller uses the PCI bus for data transfer and provides a maximum data transfer
rate of up to 1.5 Gbits/sec. The discrete SATA interface supports the following RAID levels:
• RAID 0
• RAID 1
• RAID 0+1
For information about Refer to
RAID levels Section 1.5.2.3, page 23
The location of the discrete SATA RAID connectors Figure 19, page 56
1.7 PCI Express Connectors
The board provides the following PCI Express connectors:
• One PCI Express x16 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/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. It is important to note that 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.
• One PCI Express x1 connector. The x1 interface supports simultaneous transfers up to
500 MBytes/sec.
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
• 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 Specification Rev. 1.1
24
Product Description
1.8 Auxiliary Power (AUX PWR) Output Connector (Optional)
The D955XBK board includes a 1x4 power connector that can be used to provide power for
internal chassis lighting or additional fans. The on/off function of this connector is controlled from
within the BIOS Setup Program. The default setting in the BIOS is for this connector to be off.
INTEGRATOR’S NOTES
#
When using this connector, observe the following precautions:
• Do not use a Y-adapter, power splitter, or SATA power adapter to attach storage devices (such
as hard disk drives or CD/DVD drives) to this connector. This connector will not provide
adequate power for storage devices.
• Do not connect any devices to this connector that draw more than 1.5 A. The connector
circuitry includes overcurrent protection components that limit the current draw to a maximum
of 1.5 A.
For information about Refer to
The location of the optional auxiliary power output connector Figure 19, page 56
The signal names of the optional auxiliary power output connector Table 25, page 59
1.9 IEEE-1394a/b Connectors (Optional)
The optional IEEE-1394 interface addresses interconnection of both computer peripherals and
consumer electronics with these features:
• IEEE-1394a and IEEE-1394b operation
• Support for up to 63 peer-to-peer devices
• Operation ranging from 100 Mbits/sec to 800 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 three IEEE-1394a/b connectors as follows:
• One IEEE-1394a connector located on the back panel. This connector supports IEEE-1394a
operation only; IEEE-1394b operation is not supported.
• Two IEEE-1394a/b front-panel connectors located on the component side. These connectors
can be independently configured for either IEEE-1394a or IEEE-1394b operation using the
BIOS Setup program.
The IEEE-1394a interface provides a throughput ranging from 100 Mbits/sec to 400 Mbits/sec.
The IEEE-1394b interface is completely compatible with IEEE-1394a. IEEE-1394b also supports
higher data transfer rates (800 Mbits/sec) and longer distances.
25
Intel Desktop Board D955XBK Technical Product Specification
For information about Refer to
The location of the back panel IEEE-1394a connector Figure 17, page 54
The location of the front panel IEEE-1394a/b connectors Figure 19, page 56
The signal names of the front panel IEEE-1394a/b connectors Section 2.7.2.6, page 66
1.10 I/O Controller
The 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 I/O controller.
1.10.1 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 18, page 55
1.10.2 Parallel Port
The 25-pin D-Sub parallel port connector is located on the back panel. Use the BIOS Setup
program to set the parallel port mode.
For information about Refer to
The location of the parallel port connector Figure 18, page 55
1.10.3 Diskette Drive Controller
The I/O controller supports one diskette drive. Use the BIOS Setup program to configure the
diskette drive interface.
For information about Refer to
The location of the diskette drive connector on the D955XBK board Figure 19, page 56
1.10.4 Keyboard and Mouse Interface
PS/2 keyboard and mouse connectors are located on the back panel.
26
Product Description
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 18, page 55
1.11 Audio Subsystem
The board supports the Intel High Definition audio subsystem based on the Sigmatel 9221 or the
Sigmatel 9220 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
1.11.1 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 15
1.11.2 Audio Connectors
The board contains audio connectors 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 connector 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 1.11.3; the 6-channel (5.1) audio
subsystem is described in Section 1.11.4.
For information about Refer to
The locations of the front panel audio connector and the optional ATAPI
CD-ROM connector
The signal names of the front panel audio connector Table 19, page 58
The signal names of the optional ATAPI CD-ROM connector Table 18, page 58
The back panel audio connectors Section 2.7.1, page 53
Figure 19, page 56
27
Intel Desktop Board D955XBK Technical Product Specification
1.11.3 8-Channel (7.1) Audio Subsystem
The 8-channel (7.1) audio subsystem includes the following:
• Intel 82801GR I/O Controller Hub (ICH7-R)
• Sigmatel 9221 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 9.
Front Panel
Audio Connectors
Line Out
Mic In
Surround Left and Right/Retasking Jack
[Black]
Center channel and LFE (Subwoofer)/
Retasking Jack [Orange]
S/PDIF Digital Audio Out
S/PDIF
Digital Audio Out
Coaxial
Mic In/Retasking Jack
Side Surround
Left and Right/
Line In/Retasking Jack
[Blue]
Optical
[Pink]
Figure 9. Front/Back Panel Audio Connector Options for 8-Channel (7.1) Audio Subsystem
28
Line Out/Retasking Jack
[Lime Green]
OM17555
Figure 10 is a block diagram of the 8-channel (7.1) audio subsystem.
Front Panel Mic In
Front Panel Line Out
Mic In/Retasking Jack
82801GR
I/O Controller
Hub
(ICH7-R)
Intel
High Definition
Audio Link
Sigmatel 9221
Audio Codec
Side Surround L-R/Line In/Retasking Jack
Line Out/Retasking Jack
Center and LFE/Retasking Jack
Surround Left-Right/Retasking Jack
CD-ROM (optional)
Product Description
S/PDIF
OM17556
Figure 10. 8-channel (7.1) Audio Subsystem Block Diagram
For information about Refer to
The back panel audio connectors Section 2.7.1, page 53
29
Intel Desktop Board D955XBK Technical Product Specification
1.11.4 6-Channel (5.1) Audio Subsystem
The 6-channel (5.1) audio subsystem includes the following:
• Intel 82801GR I/O Controller Hub (ICH7-R)
• Sigmatel 9220 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.
Back Panel
Audio Connectors
Retasking Jack
Retasking Jack
Retasking Jack
Line In/
Line Out/
Mic In/
OM17560
Line Out
Front Panel
Audio Connectors
Mic In
Figure 11. Front/Back Panel Audio Connector Options for 6-Channel (5.1) Audio Subsystem
Figure 12 is a block diagram of the 6-channel (5.1) audio subsystem.
Mic In/Retasking Jack
82801GR
I/O Controller
Hub
(ICH7-R)
Intel
High Definition
Audio Link
Sigmatel
9220
Audio Codec
Line In/Retasking Jack
Line Out/Retasking Jack
Front Panel Mic In
Front Panel Line Out
CD-ROM (optional)
Figure 12. 6-Channel (5.1) Audio Subsystem Block Diagram
For information about Refer to
The back panel audio connectors Section 2.7.1, page 53
30
OM17554
Product Description
1.12 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.
1.12.1 Intel® 82573E/82573V/82574V Gigabit Ethernet Controller
The Intel 82573E/82573V/82574V 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 also supports Alert Standard Format (ASF) 2.0.
1.12.2 RJ-45 LAN Connector with Integrated LEDs
Two LEDs are built into the RJ-45 LAN connector (as shown in Figure 13). Table 5 describes the
LED states when the board is powered up and the Gigabit LAN subsystem is operating.
Green LED
Figure 13. LAN Connector LED Locations
Table 5. LAN Connector LED States
LED Color LED State Condition
Off LAN link is not established.
Left Green
N/A Off 10 Mbits/sec data rate is selected.
Right
Green On 100 Mbits/sec data rate is selected.
Yellow
On LAN link is established.
Blinking LAN activity is occurring.
On
Green/Yellow LED
OM16513
1000 Mbits/sec data rate is selected.
31
Intel Desktop Board D955XBK Technical Product Specification
1.12.3 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 installed in PCI Conventional bus slot 2:
• 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.
1.12.4 Intel® Active Management Technology (AMT) (Optional)
Intel Active Management Technology (AMT) offers IT organizations tamper-resistant and
®
persistent management capabilities. Specifically, Intel
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
AMT is a hardware-based solution that
32
Product Description
• 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
33
Intel Desktop Board D955XBK Technical Product Specification
1.12.5 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 15
1.13 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
1.13.1 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 connectors and sensors for thermal monitoring Figure 14, page 35
34
1.13.2 Thermal Monitoring
Figure 14 shows the location of the sensors and fan connectors.
Product Description
G
4
1
13
3
1
4
D
1
EF
OM17725
Item Description
A Remote ambient temperature sensor
B Thermal diode, located on processor die
C Ambient temperature sensor, internal to hardware monitoring and fan control ASIC
D Processor fan connector
E Rear chassis fan connector
F Front chassis fan connector
G Auxiliary rear fan connector
A
B
C
Figure 14. Sensors and Fan Connectors
35
Intel Desktop Board D955XBK Technical Product Specification
1.13.3 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 connectors Section 1.14.2.2, page 40
1.13.4 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
connector. When the chassis cover is removed, the mechanical switch is in the closed position.
1.14 Power Management
Power management is implemented at several levels, including:
• Software support through Advanced Configuration and Power Interface (ACPI)
• Hardware support:
⎯ Power connector
⎯ Fan connectors
⎯ LAN wake capabilities
⎯ Instantly Available PC technology
⎯ Resume on Ring
⎯ Wake from USB
⎯ Wake from PS/2 devices
⎯ Power Management Event signal (PME#) wake-up support
⎯ PCI Express WAKE# signal support
1.14.1 ACPI
ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer. The use of ACPI with 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 8 on page 39)
• Support for a front panel power and sleep mode switch
36
Product Description
Table 6 lists the system states based on how long the power switch is pressed, depending on how
ACPI is configured with an ACPI-aware operating system.
Table 6. Effects of Pressing the Power Switch
If the system is in this state…
Off
(ACPI G2/G5 – Soft off)
On
(ACPI G0 – working state)
On
(ACPI G0 – working state)
Sleep
(ACPI G1 – sleeping state)
Sleep
(ACPI G1 – sleeping state)
…and the power switch is
pressed for
Less than four seconds Power-on
Less than four seconds Soft-off/Standby
More than four seconds Fail safe power-off
Less than four seconds Wake-up
More than four seconds Power-off
…the system enters this state
(ACPI G0 – working state)
(ACPI G1 – sleeping state)
(ACPI G2/G5 – Soft off)
(ACPI G0 – working state)
(ACPI G2/G5 – Soft off)
1.14.1.1 System States and Power States
Under ACPI, the operating system directs all system and device power state transitions. The
operating system puts devices in and out of low-power states based on user preferences and
knowledge of how devices are being used by applications. Devices that are not being used can be
turned off. The operating system uses information from applications and user settings to put the
system as a whole into a low-power state.
37
Intel Desktop Board D955XBK Technical Product Specification
Table 7 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 7. Power States and Targeted System Power
Global States Sleeping States
G0 – working
S0 – working C0 – working D0 – working
state
G1 – sleeping
state
G1 – sleeping
state
S1 – Processor
stopped
S3 – Suspend to
RAM. Context
saved to RAM.
G1 – sleeping
state
S4 – Suspend to
disk. Context
saved to disk.
G2/S5 S5 – Soft off.
Context not saved.
Cold boot is
required.
G3 –
mechanical off
No power to the
system.
AC power is
disconnected
from the
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.
Processor
States
Device States
state.
C1 – stop
grant
D1, D2, D3 –
device
specification
specific.
No power D3 – no power
except for
wake-up logic.
No power D3 – no power
except for
wake-up logic.
No power D3 – no power
except for
wake-up logic.
No power D3 – no power for
wake-up logic,
except when
provided by
battery or external
source.
Targeted System
Power
(Note 1)
Full power > 30 W
5 W < power < 52.5 W
Power < 5 W
Power < 5 W
Power < 5 W
No power to the system.
Service can be performed
safely.
(Note 2)
(Note 2)
(Note 2)
38
Product Description
1.14.1.2 Wake-up Devices and Events
Table 8 lists the devices or specific events that can wake the computer from specific states.
Table 8. Wake-up Devices and Events
These devices/events can wake up the computer… …from this state
LAN S1, S3, S4, S5
Modem (back panel Serial Port A) S1, S3
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
NOTE
will enable a wake-up event from LAN in the S5 state.
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.
(Note)
(Note)
1.14.2 Hardware Support
CAUTION
Ensure that the power supply provides adequate +5 V standby current if LAN wake capabilities and
Instantly Available PC technology features are used. Failure to do so can damage the power
supply. The total amount of standby current required depends on the wake devices supported and
manufacturing options.
The board provides several power management hardware features, including:
• Power connector
• Fan connectors
• LAN wake capabilities
• Instantly Available PC technology
• Resume on Ring
• Wake from USB
• Wake from PS/2 keyboard
• PME# 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.
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).
39
Intel Desktop Board D955XBK Technical Product Specification
NOTE
The use of Resume on Ring and Wake from USB technologies from an ACPI state requires an
operating system that provides full ACPI support.
1.14.2.1 Power Connector
When 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 19, page 56
The signal names of the main power connector Table 26, page 60
1.14.2.2 Fan Connectors
The function/operation of the fan connectors 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 connector is wired to a fan tachometer input of the hardware monitoring and fan
control ASIC
• All fan connectors support closed-loop fan control that can adjust the fan speed or switch the
fan on or off as needed.
• All fan connectors have a +12 V DC connection
For information about Refer to
The location of the fan connectors Figure 19, page 56
The location of the fan connectors and sensors for thermal monitoring Figure 14, page 35
The signal names of the fan connectors Section 2.7.1.1, page 54
1.14.2.3 LAN Wake Capabilities
CAUTION
For LAN wake capabilities, the +5 V standby line for the power supply must be capable of
providing adequate +5 V standby current. Failure to provide adequate standby current when
implementing LAN wake capabilities can damage the power supply.
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
40
Product Description
• The onboard LAN subsystem
1.14.2.4 Instantly Available PC Technology
CAUTION
For Instantly Available PC technology, the +5 V standby line for the power supply must be capable
of providing adequate +5 V standby current. Failure to provide adequate standby current when
implementing Instantly Available PC technology can damage the power supply.
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 8 on page
39 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.
1.14.2.5 Resume on Ring
The operation of Resume on Ring can be summarized as follows:
• Resumes operation from ACPI S1 or S3 states
• Detects incoming call similarly for external and internal modems
• Requires modem interrupt be unmasked for correct operation
1.14.2.6 Wake from USB
USB bus activity wakes the computer from ACPI S1 or S3 states.
NOTE
Wake from USB requires the use of a USB peripheral that supports Wake from USB.
1.14.2.7 Wake from PS/2 Devices
PS/2 device activity wakes the computer from an ACPI S1 or S3 state.
1.14.2.8 PME# 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 BIOS).
1.14.2.9 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.
41
Intel Desktop Board D955XBK Technical Product Specification
1.14.2.10 +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 15 shows the location of the standby power indicator LED on the
D955XBK 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.
CR3J1
OM17721
Figure 15. Location of the Standby Power Indicator LED
42
Product Description
1.15 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/bk/
43
Intel Desktop Board D955XBK Technical Product Specification
44
2 Technical Reference
What This Chapter Contains
2.1 Memory Resources......................................................................................................45
2.2 DMA Channels.............................................................................................................47
2.3 Fixed I/O Map...............................................................................................................48
2.4 PCI Configuration Space Map......................................................................................49
2.5 Interrupts......................................................................................................................50
2.6 PCI Conventional Interrupt Routing Map .....................................................................51
2.7 Connectors...................................................................................................................53
2.8 Jumper Block ...............................................................................................................67
2.9 Mechanical Considerations..........................................................................................68
2.10 Electrical Considerations..............................................................................................71
2.11 Thermal Considerations...............................................................................................73
2.12 Reliability......................................................................................................................75
2.13 Environmental..............................................................................................................76
2.14 Regulatory Compliance................................................................................................77
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 (firmware
hub), 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/firmware hub (2 MB)
• 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 16 shows a schematic of the system memory map. All installed
system memory can be used when there is no overlap of system addresses.
45
Intel Desktop Board D955XBK Technical Product Specification
8 GB
Top of System Address Space
Upper
4 GB of
address
space
FLASH
PCI Memory Range -
contains PCI, chipsets,
Direct Media Interface
(DMI), and ICH ranges
(approximately 750 MB)
DRAM
Range
Compatibility
Memory
DOS
APIC
Reserved
~20 MB
Top of usable
DRAM (memory
visible to the
operating
system)
1 MB
640 KB
0 MB
0FFFFFH
0F0000H
0EFFFFH
0E0000H
0DFFFFH
0C0000H
0BFFFFH
0A0000H
09FFFFH
00000H
Upper BIOS
area (64 KB)
Lower BIOS
area
(64 KB;
16 KB x 4)
Add-in Card
BIOS and
Buffer area
(128 KB;
16 KB x 8)
Standard PCI/
ISA Video
Memory (SMM
Memory)
128 KB
DOS area
(640 KB)
1 MB
960 KB
896 KB
768 KB
640 KB
0 KB
OM17801
Figure 16. Detailed System Memory Address Map
46
2.1.2 Memory Map
Table 9 lists the system memory map.
Table 9. 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
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
512 K - 639 K 80000 - 9FBFF 127 KB Extended conventional memory
0 K - 512 K 00000 - 7FFFF 512 KB Conventional memory
Technical Reference
memory (open to the PCI
Conventional bus). Dependent on
video adapter used.
memory manager software)
2.2 DMA Channels
Table 10. 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
47
Intel Desktop Board D955XBK Technical Product Specification
2.3 Fixed I/O Map
Table 11. I/O Map
Address (hex) Size Description
0000 - 00FF 256 bytes Used by the Desktop Board D955XBK. Refer to the
ICH7-R 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
0228 - 022F
0278 - 027F
02E8 - 02EF
02F8 - 02FF
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
0CF8 - 0CFB
0CF9
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 1)
8 bytes LPT3
(Note 1)
8 bytes LPT2
(Note 1)
8 bytes COM4
(Note 1)
8 bytes COM2
(Note 2)
4 bytes PCI Conventional bus configuration address register
(Note 3)
1 byte Reset control register
NOTE
Some additional I/O addresses are not available due to ICH7-R address aliasing. The ICH7-R
data sheet provides more information on address aliasing.
For information about Refer to
Obtaining the ICH7-R data sheet Section 1.2 on page 15
48
2.4 PCI Configuration Space Map
Table 12. PCI Configuration Space Map
Bus
Number (hex)
00 00 00 Memory controller of Intel 82955X component
00 01 00 PCI Express x16 graphics port
00 1B 00 Intel High Definition Audio Controller
00 1C 00 PCI Express port 1 (PCI Express x1 bus connector 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)
(Note)
(Note)
(Note)
(Note)
Note: Bus number is dynamic and can change based on add-in cards used.
Device
Number (hex)
Function
Number (hex) Description
00 00 Gigabit Ethernet Controller
00 00 PCI Conventional bus connector 1
01 00 PCI Conventional bus connector 2
02 00 PCI Conventional bus connector 3
05 00 IEEE-1394a/b controller
Technical Reference
49
Intel Desktop Board D955XBK 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 component. The PIC
is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts. The APIC is
supported in Windows 2000 and Windows XP and supports a total of 24 interrupts.
Table 13. 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
4 COM1
5 User available
6 Diskette drive
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 AT A – Legacy Mode (if present, else user available)
(Note 2)
16
17
18
19
20
21
22
23
Notes:
1. Default, but can be changed to another IRQ.
2. Available in APIC mode only.
User available (through PIRQA)
(Note 2)
User available (through PIRQB)
(Note 2)
User available (through PIRQC)
(Note 2)
User available (through PIRQD)
(Note 2)
User available (through PIRQE)
(Note 2)
User available (through PIRQF)
(Note 2)
User available (through PIRQG)
(Note 2)
User available (through PIRQH)
(Note 1)
(Note 1)
50
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 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 14 shows an example of how the
PIRQ signals are routed.
For example, using Table 14 as a reference, assume an add-in card using INTA is plugged into PCI
Conventional bus connector 3. In PCI bus connector 3, INTA is connected to PIRQB, which is
already connected to the ICH7-R audio controller. The add-in card in PCI Conventional bus
connector 3 now shares an interrupt with the onboard interrupt source.
51
Intel Desktop Board D955XBK Technical Product Specification
Table 14. PCI Interrupt Routing Map
ICH7-R PIRQ Signal Name
PCI Interrupt Source
IEEE-1394a/b controller INTA
PCI bus connector 1 INTD INTA INTB INTC
PCI bus connector 2 INTC INTB INTA INTD
PCI bus connector 3 INTD INTC INTA INTB
PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH
NOTE
In PIC mode, the ICH7-R 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 13 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.
52
Technical Reference
2.7 Connectors
CAUTION
Only the following connectors have overcurrent protection: back panel USB, front panel USB, and
PS/2.
The other internal connectors are not overcurrent protected and should connect only to devices
inside the computer’s chassis, such as fans and internal peripherals. Do not use these connectors
to power devices external to the computer’s chassis. A fault in the load presented by the external
devices could cause damage to the computer, the 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 (see page 56)
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 54
• 6-channel (5.1) audio subsystem (three analog audio output connectors), described on page 55
53
Intel Desktop Board D955XBK Technical Product Specification
2.7.1.1 Back Panel Connectors For 8-Channel (7.1) Audio Subsystem
Figure 17 shows the location of the back panel connectors for boards equipped with the 8-channel
(7.1) audio subsystem. The back panel connectors are color-coded. The figure legend (Table 15)
lists the colors used (when applicable).
L
AC
D
Figure 17. Back Panel Connectors for 8-Channel (7.1) Audio Subsystem
Table 15 lists the back panel connectors identified in Figure 17.
F
H
G IB E NM O
KJ
OM17726
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.
Table 15. Back Panel Connectors Shown in Figure 17
Item/callout from
Figure 17
A
B
C
D
E
F
G USB ports (two)
H
I
J
K
L
M
N Mic in/Retasking Jack B [Pink]
O
Description
PS/2 mouse port [Green]
PS/2 keyboard port [Purple]
Serial port A [Teal]
Parallel port [Burgundy]
Digital audio out coaxial
IEEE-1394a connector
LAN
USB ports (two)
Center channel and LFE (subwoofer) audio out/ Retasking Jack G
[Orange]
Surround left/right channel audio out/Retasking Jack H [Black]
Audio line in/Retasking Jack C [Blue]
Digital audio out optical
Front left/right channel audio out/Two channel audio line out/Retasking Jack D
[Lime green]
54
Technical Reference
2.7.1.2 Back Panel Connectors For 6-Channel (5.1) Audio Subsystem
Figure 18 shows the location of the back panel connectors for boards equipped with the 6-channel
(5.1) audio subsystem. The back panel connectors are color-coded. The figure legend (Table 16)
lists the colors used (when applicable).
H
AC
D
F
E GB I J
Figure 18. Back Panel Connectors for 6-Channel (5.1) Audio Subsystem
Table 16 lists the back panel connectors identified in Figure 18.
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.
Table 16. Back Panel Connectors Shown in Figure 18
Item/callout from
Figure 18
A
B
C
D
E
F
G USB ports (two)
H
I Mic in/Retasking Jack B [Pink]
J
Description
PS/2 mouse port [Green]
PS/2 keyboard port [Purple]
Serial port A [Teal]
Parallel port [Burgundy]
USB ports (two)
LAN
Audio line in/Retasking Jack C [Blue]
Front left/right channel audio out/Two channel audio line out/Retasking Jack D
[Lime green]
OM17727
55
Intel Desktop Board D955XBK Technical Product Specification
2.7.2 Component-side Connectors
Figure 19 shows the locations of the component-side connectors.
12
10
12
10
1
1
HH
GG
FF
EE
A
4
1
1
4
H J K L
192
10
1
IB DC E F G
41
1
3
4
1
12
85
12
1
1
172
10
1
4
2
2
1
10
1
9
1
1
1
4
1
1
DD
CC
BBAAZ
Y W
U
VX T
13
S
Q
R
2
1
Figure 19. D955XBK Component-side Connectors
Table 17 lists the component-side connectors identified in Figure 19.
24 2
23
40
2
39
1
1
34
33
N MOP
OM17728
56
Table 17. Component-side Connectors Shown in Figure 19
Item/callout from Figure 19 Description
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA
BB
CC
DD
EE
FF
GG
HH
PCI Express x1 bus add-in card connector
Auxiliary rear fan connector
PCI Conventional bus add-in card connector 3
ATAPI CD-ROM connector (optional)
PCI Conventional bus add-in card connector 2
PCI Conventional bus add-in card connector 1
Front panel audio connector
Secondary PCI Express x16/x4 bus add-in card connector
PCI Express x16 bus add-in card connector
Alternate power connector (optional)
Rear chassis fan connector
Processor power connector
Processor fan connector
Power connector
Diskette drive connector
Parallel ATA IDE connector
Front chassis fan connector
Chassis intrusion connector
Serial ATA connector 3 (ICH7-R RAID)
Serial ATA connector 2 (ICH7-R RAID)
Serial ATA connector 0 (ICH7-R RAID)
Serial ATA connector 1 (ICH7-R RAID)
Auxiliary front panel power LED connector
Front panel connector
Front panel USB connector
Auxiliary power output connector (optional)
SCSI hard drive activity indicator LED (optional)
Serial ATA connector 7 (Discrete RAID) (optional)
Serial ATA connector 6 (Discrete RAID) (optional)
Serial ATA connector 4 (Discrete RAID) (optional)
Serial ATA connector 5 (Discrete RAID) (optional)
Front panel IEEE-1394a/b connector [pink] (optional)
Front panel IEEE-1394a/b connector [blue] (optional)
Front panel USB connector
Technical Reference
57
Intel Desktop Board D955XBK Technical Product Specification
Table 18. 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 19. Front Panel Audio Connector
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
7 Port E [Port 1] and Port F [Port 2]
Sense send (jack detection)
9 Port F [Port 2] Left Channel 10 Port F [Port 2] Sense return
8 Key
(jack detection)
(jack detection)
INTEGRATOR’S NOTE
#
The front panel audio connector is colored yellow.
Table 20. Front Chassis Fan and Rear Chassis
Fan Connectors
Pin Signal Name
1 Control
2 +12 V
3 Tach
Table 21. Processor Fan Connector and
Auxiliary Rear Fan Connector
Pin Signal Name
1 Ground
2 +12 V
3 FAN_TACH
4 FAN_CONTROL
58
Table 22. Chassis Intrusion Connector
Pin Signal Name
1 Intruder
2 Ground
Table 23. SCSI Hard Drive Activity LED
Connector (Optional)
Pin Signal Name
1 ACT#
2 No connect
Table 24. Serial ATA Connectors
Pin Signal Name
1 Ground
2 TXP
3 TXN
4 Ground
5 RXN
6 RXP
7 Ground
Technical Reference
Table 25. Auxiliary Power Output Connector
(Optional)
Pin Signal Name
1 +12 V
2 Ground
3 Ground
4 +5 V
59
Intel Desktop Board D955XBK Technical Product Specification
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 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.
• Alternate 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 both the PCI Express x16 and the
Secondary PCI Express x16/x4 bus add-in card connectors.
CAUTION
Regardless of the connector type (2 x 4 or a 2 x 2), the Processor 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 dualrail 2 x 4 Processor 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 both the PCI Express x16 and the
Secondary PCI Express x16/x4 bus add-in card connectors, the Alternate Power connector must be
used. Failure to do so may cause damage to the board and the add-in cards.
60
Table 26. 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 27. Processor 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
Technical Reference
Table 28. Processor Power Connector (2 x 2 Pin)
Pin Signal Name Pin Signal Name
1 Ground 2 +12 V
2 Ground 4 +12 V
Table 29. Alternate Power Connector
Pin Signal Name
1 +12 V
2 1 x 4 connector detect
3 Ground
4 +5 V
61
Intel Desktop Board D955XBK Technical Product Specification
2.7.2.2 Add-in Card Connectors
The board has the following add-in card connectors:
• PCI Express x16; one connector supporting simultaneous transfers up to 8 GBytes/sec
• Secondary PCI Express x16/x4 bus; one connector supporting simultaneous transfers up to
2 GBytes/sec
• PCI Express x1; one connector supporting simultaneous transfers up to 500 MBytes/sec
• PCI Conventional (rev 2.2 compliant) bus; three PCI Conventional bus add-in card connectors.
The SMBus is routed to PCI Conventional bus connector 2 only (ATX expansion slot 6). PCI
Conventional bus add-in cards with SMBus support can access sensor data and other
information residing on the Desktop Board.
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 PCI Conventional bus connector 2. 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 Connector
Pins 1 and 3 of this connector duplicate the signals on pins 2 and 4 of the front panel connector.
Table 30. Auxiliary Front Panel Power/Sleep LED Connector
Pin Signal Name In/Out Description
1 HDR_BLNK_GRN Out Front panel green LED
2 Not connected
3 HDR_BLNK_YEL Out Front panel yellow LED
62
Technical Reference
2.7.2.4 Front Panel Connector
This section describes the functions of the front panel connector. Table 31 lists the signal names of
the front panel connector. Figure 20 is a connection diagram for the front panel connector.
Table 31. Front Panel Connector
Pin Signal In/Out Description Pin Signal In/Out Description
Hard Drive Activity LED
[Yellow]
1 HD_PWR Out Hard disk LED pull-up
(750 Ω) to +5 V
3 HAD# Out Hard disk active LED 4 HDR_BLNK_
Reset Switch
[Purple]
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
2 HDR_BLNK_
GRN
YEL
Power LED
[Green]
Out Front panel green
LED
Out Front panel yellow
LED
On/Off Switch
[Red]
+5 V DCN/C
Purple
Yellow
Reset
Switch
−
+
Dual-colored
Power LED
+
−
Power
Switch
Single-colored
Power LED
−
+
Green Red
9
8
7
6
5
4
3
2
1
Figure 20. Connection Diagram for Front Panel Connector
Hard Drive
Activity LED
OM17000
63
Intel Desktop Board D955XBK Technical Product Specification
2.7.2.4.1 Hard Drive Activity LED Connector [Yellow]
Pins 1 and 3 [Yellow] 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 Connector [Purple]
Pins 5 and 7 [Purple] 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 Connector [Green]
Pins 2 and 4 [Green] can be connected to a one- or two-color LED. Table 32 shows the possible
states for a one-color LED. Table 33 shows the possible states for a two-color LED.
Table 32. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Green Running
Table 33. 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 32 and Table 33 are suggested colors only. Actual LED colors are
product- or customer-specific.
2.7.2.4.4 Power Switch Connector [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.
64
Technical Reference
2.7.2.5 Front Panel USB Connectors
Figure 21 is a connection diagram for the front panel USB connectors.
INTEGRATOR’S NOTES
#
• The +5 V DC power on the USB connector 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.
One
USB
Port
Power
(+5 V DC)
D−
D+
Ground
Key (no pin)
2
1
4
3
6
5
8
7
10
Power
(+5 V DC)
D−
D+
Ground
No Connect
One
USB
Port
OM15963
Figure 21. Connection Diagram for Front Panel USB Connectors
65
Intel Desktop Board D955XBK Technical Product Specification
2.7.2.6 Front Panel IEEE 1394a/b Connectors (Optional)
Figure 22 is a connection diagram for the IEEE 1394a/b connectors.
TPA−
2
TPA+
1
Ground
TPB+ TPB−
+12 V DC
Key (no pin)
3
5
7
4
6
8
10
Ground
+12 V DC
Ground
OM16107
Figure 22. Connection Diagram for Front Panel IEEE 1394a/b Connectors
INTEGRATOR’S NOTES
#
• The IEEE 1394a/b connectors are different colors; one connector is blue, the other connector
is pink.
• The +12 V DC power on the IEEE 1394a/b connectors is fused.
• Each IEEE 1394a/b connector provides one IEEE 1394a/b port.
66
Technical Reference
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 23 shows the location of the jumper block. The 3-pin jumper block determines the BIOS
Setup program’s mode. Table 34 describes the jumper settings for the three modes: normal,
configure, and recovery. When the jumper is set to configure mode and the computer is poweredup, the BIOS compares the processor version and the microcode version in the BIOS and reports if
the two match.
3
1
J6J2
Figure 23. Location of the Jumper Block
Table 34. BIOS Setup Configuration Jumper Settings
Function/Mode Jumper Setting Configuration
Normal 1-2
Configure 2-3
Recovery None
3
1
3
1
3
1
The BIOS uses current configuration information and
passwords for booting.
After the POST runs, Setup runs automatically. The
maintenance menu is displayed.
The BIOS attempts to recover the BIOS configuration. A
recovery diskette is required.
OM17722
67
Intel Desktop Board D955XBK Technical Product Specification
2.9 Mechanical Considerations
2.9.1 Form Factor
The board is designed to fit into an ATX-form-factor chassis. Figure 24 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.
1.800
[45.72]
6.500
[165.10]
6.100
[154.94]
5.200
[132.08]
0.00
2.850
[72.39]
3.100
[78.74]
5.550
[140.97]
4.900
[124.46]
0.00
Figure 24. Board Dimensions
6.200
[157.48]
6.450
[163.83]
OM17723
68
Technical Reference
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 25
shows the I/O shield for boards with the 8-channel (7.1) audio subsystem. Figure 26 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 2.03 are available from Intel.
162.3 REF
1.55 REF
[0.061]
20 ± 0.254 TYP
[0.787 ± 0.10]
[6.390]
159.2 ± 0.12
[6.268 ± 0.005]
1.6 ± 0.12
[0.063 ± 0.005]
7.01
[0.276]
0.00
[0.00]
12.04
[0.474]
22.45
[0.884]
Ø 1.00
[0.039]
11.81
[0.465]
12.81
[0.504]
8x R 0.5 MIN
146.88
[5.783]
A
11.81
[0.465]
14.17
[0.558]
OM17814
A
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]
Pictorial
View
Figure 25. I/O Shield Dimensions for Boards with the 8-Channel (7.1) Audio Subsystem
69
Intel Desktop Board D955XBK Technical Product Specification
162.3 REF
[6.390]
20 ± 0.254 TYP
1.55 REF
7.012
[0.276]
0.00
[0.00]
12.04
[0.474]
[0.061]
22.45
[0.884]
Ø 1.00
[0.039]
11.811
[0.465]
[0.787 ± 0.10]
A
0.00
8.805
[0.00]
20.283
[0.799]
26.911
[0.347]
[1.059]
159.2 ± 0.12
[6.268 ± 0.005]
93.74
[3.690]
113.63
[4.473]
146.88
[5.783]
1.6 ± 0.12
[0.063 ± 0.005]
8x R 0.5 MIN
A
11.81
[0.465]
14.17
[0.558]
Pictorial
View
OM17815
Figure 26. I/O Shield Dimensions for Boards with the 6-Channel (5.1) Audio Subsystem
70
Technical Reference
2.10 Electrical Considerations
2.10.1 DC Loading
Table 35 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 35. 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)
Maximum loading 500 W 25 A 27 A 36 A 0.40 A 0.34 A (S0)
1.25 A (S3)
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 and the PCI Express x16 slot filled) must not exceed 12 A.
71
Intel Desktop Board D955XBK Technical Product Specification
2.10.3 Fan Connector Current Capability
CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan
connector. Connecting the processor fan to a chassis fan connector may result in onboard
component damage that will halt fan operation.
Table 36 lists the current capability of the fan connectors.
Table 36. Fan Connector Current Capability
Fan Connector Maximum Available Current
Processor fan 3.0 A
Front chassis fan 1.0 A
Rear chassis fan 1.0 A
Auxiliary rear fan 3.0 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 35 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 indicated
sections of the ATX form factor specification.
• The potential relation between 3.3 VDC and +5 VDC power rails (Section 4.2)
• The current capability of the +5 VSB line (Section 4.2.1.2)
• All timing parameters (Section 4.2.1.3)
• All voltage tolerances (Section 4.2.2)
72
Technical Reference
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 triggered at approximately 120
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 (similar to the type shown in
Figure 27) to maintain required airflow across the processor voltage regulator area.
o
C.
OM16996
Figure 27. Example of a Processor Heatsink for Omni-directional Airflow
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 (item A in Figure 28) 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.
73
Intel Desktop Board D955XBK Technical Product Specification
A
B
CD
OM17724
Item Description
A Processor voltage regulator area
B Processor
C Intel 82955X MCH
D Intel 82801GR ICH7-R
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.
74
Technical Reference
Table 37 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 37. Thermal Considerations for Components
Component Temperature
Processor voltage regulator area 120 oC (under bias)
Intel Pentium 4 processor For processor case temperature, see processor datasheets and
processor specification updates
Intel 82955X MCH 99 oC (under bias)
Intel 82801GR ICH7-R 110 oC (under bias)
NOTE
For hardware monitoring application software, an alert point of 110 oC 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 15
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 91425.23
hours.
75
Intel Desktop Board D955XBK Technical Product Specification
2.13 Environmental
Table 38 lists the environmental specifications for the board.
Table 38. Environmental Specifications
Parameter Specification
Temperature
Non-Operating
Operating
Shock
Unpackaged 50 g tr apezoidal waveform
Velocity change of 170 inches/second
Packaged Half sine 2 millisecond
Product Weight (pounds) Free Fall (inches) Velocity Change (inches/sec)
<20 36 167
21-40 30 152
41-80 24 136
81-100 18 118
Vibration
Unpackaged 5 Hz to 20 Hz: 0.01 g² Hz sloping up to 0.02 g² Hz
20 Hz to 500 Hz: 0.02 g² Hz (flat)
Packaged 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
-40 °C to +70 °C
0 °C to +55 °C
76
Technical Reference
2.14 Regulatory Compliance
This section describes the board’s compliance with U.S. and international safety and
electromagnetic compatibility (EMC) regulations.
2.14.1 Safety Regulations
Table 39 lists the safety regulations the Desktop Board D955XBK complies with when correctly
installed in a compatible host system.
Table 39. Safety Regulations
Regulation Title
UL 60950-1:2003/
CSA C22.2 No. 60950-1-03
EN 60950-1:2002 Information Technology Equipment - Safety - Part 1: General
IEC 60950-1:2001, First Edition Information Technology Equipment - Safety - Part 1: General
Information Technology Equipment - Safety - Part 1: General
Requirements (USA and Canada)
Requirements (European Union)
Requirements (International)
2.14.2 EMC Regulations
Table 40 lists the EMC regulations the Desktop Board D955XBK complies with when correctly
installed in a compatible host system.
Table 40. EMC Regulations
Regulation Title
FCC (Class B) Title 47 of the Code of Federal Regulations, Parts 2 and 15, Subpart B,
Radio Frequency Devices. (USA)
ICES-003 (Class B) Interference-Causing Equipment Standard, Digital Apparatus. (Canada)
EN55022: 1998 (Class B) Limits and methods of measurement of Radio Interference
Characteristics of Information Technology Equipment.
(European Union)
EN55024: 1998 Information T echnology Equipment – Immunity Characteristics Limit s
and methods of measurement. (European Union)
AS/NZS 3548 (Class B) Australian Communications Authority, Standard for Electromagnetic
Compatibility. (Australia and New Zealand)
CISPR 22, 3rd Edition (Class B) Limit s and methods of measurement of Radio Disturbance
Characteristics of Information Technology Equipment. (International)
CISPR 24: 1997 Information Technology Equipment – Immunity Characteristics – Limits
and Methods of Measurements. (International)
VCCI (Class B) Voluntary Control for Interference by Information Technology Equipment.
(Japan)
77
Intel Desktop Board D955XBK Technical Product Specification
2.14.2.1 FCC Compliance Statement (USA)
Product Type: D955XBK Desktop Board
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to a different electrical branch circuit from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
Any changes or modifications to the equipment not expressly approved by Intel Corporation could
void the user’s authority to operate the equipment.
2.14.2.2 Canadian Compliance Statement
This Class B digital apparatus complies with Canadian ICES-003.
Cet appereil numérique de la classe B est conforme à la norme NMB-003 du Canada.
2.14.3 European Union Declaration of Conformity Statement
We, Intel Corporation, declare under our sole responsibility that the product: Intel
D955XBK is in conformity with all applicable essential requirements necessary for CE marking,
following the provisions of the European Council Directive 89/336/EEC (EMC Directive) and
Council Directive 73/23/EEC (Safety/Low Voltage Directive).
The product is properly CE marked demonstrating this conformity and is for distribution within all
member states of the EU with no restrictions.
This product follows the provisions of the European Directives 89/336/EEC and 73/23/EEC.
Dansk Dette produkt er i overensstemmelse med det europæiske direktiv 89/336/EEC &
73/23/EEC.
®
Desktop Board
Dutch Dit product is in navolging van de bepalingen van Europees Directief 89/336/EEC &
73/23/EEC.
78
Technical Reference
Suomi Tämä tuote noudattaa EU-direktiivin 89/336/EEC & 73/23/EEC määräyksiä.
Français Ce produit est conforme aux exigences de la Directive Européenne 89/336/EEC &
73/23/EEC.
Deutsch Dieses Produkt entspricht den Bestimmungen der Europäischen Richtlinie 89/336/EEC &
73/23/EEC.
Icelandic Þessi vara stenst reglugerð Evrópska Efnahags Bandalagsins númer 89/336/ EEC &
73/23/EEC.
Italiano Questo prodotto è conforme alla Direttiva Europea 89/336/EEC & 73/23/EEC.
Norsk Dette produktet er i henhold til bestemmelsene i det europeiske direktivet 89/336/ EEC &
73/23/EEC.
Portuguese Este produto cumpre com as normas da Diretiva Européia 89/336/EEC &
73/23/EEC.
Español Este producto cumple con las normas del Directivo Europeo 89/336/EEC & 73/23/EEC.
Svenska Denna produkt har tillverkats i enlighet med EG-direktiv 89/336/EEC & 73/23/EEC.
2.14.4 Recycling Considerations
Intel encourages its customers to recycle its products and their components (e.g., batteries, circuit
boards, plastic enclosures, etc.) whenever possible. In the U.S., a list of recyclers in your area can
be found at:
http://www.eiae.org/
In the absence of a viable recycling option, products and their components must be disposed of in
accordance with all applicable local environmental regulations.
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Intel Desktop Board D955XBK Technical Product Specification
2.14.5 Product Certification Markings (Board Level)
Table 41 lists the board’s product certification markings.
Table 41. Product Certification Markings
Description Marking
UL joint US/Canada Recognized Component mark. Includes adjacent
UL file number for Intel Desktop Boards: E210882 (component side).
FCC Declaration of Conformity logo mark for Class B equipment;
includes Intel name and D955XBK model designation (component side).
CE mark. Declares compliance to European Union (EU) EMC directive
(89/336/EEC) and Low Voltage directive (73/23/EEC) (component side).
The CE mark should also be on the shipping container.
Australian Communications Authority (ACA) C-Tick mark. Includes
adjacent Intel supplier code number, N-232. The C-tick mark should
also be on the shipping container.
Printed wiring board manufacturer’s recognition mark: consists of a
unique UL recognized manufacturer’s logo, along with a flammability
rating (solder side).
Lead – Free Certification
Pb-free certification markings are per the JEDEC spec.
Pb-free symbol - PB_FREE_SILK
e1 symbol (specifies the composition of the solder paste) - E1_SILK
ND
Level Interconnect (used until a board is considered Pb-free per the
2
RoHS definition – This must follow the Pb-free symbol. It is abbreviated
per spec) - 2ND_LVL_INTCT_SILK
260 °C (specifies maximum safe processing temperature) - 260C_SILK
V-0 or 94V-0
2ND LVL INTCT
260
o
C
e1Pb
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 Legacy USB Support....................................................................................................83
3.5 BIOS Updates..............................................................................................................84
3.6 Boot Options ................................................................................................................85
3.7 Fast Booting Systems with Intel® Rapid BIOS Boot.....................................................86
3.8 BIOS Security Features ...............................................................................................87
3.1 Introduction
The BIOS is stored in either a Firmware Hub (FWH) or a Serial Peripheral Interface (SPI) Flash
device and can be updated using a disk-based program. The FWH or 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 BK95510J.86A.
When the BIOS Setup configuration jumper is set to configure mode and the computer is poweredup, 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 <F2> key after the Power-On Self-Test (POST)
memory test begins and before the operating system boot begins. The menu bar is shown below.
Maintenance Main Advanced Security Power Boot Exit
NOTE
The maintenance menu is displayed only when the board is in configure mode. Section 2.8 on
page 67 shows how to put the board in configure mode.
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Intel Desktop Board D955XBK Technical Product Specification
Table 42 lists the BIOS Setup program menu features.
Table 42. BIOS Setup Program Menu Bar
Maintenance Main Advanced Security Power Boot Exit
Clears
passwords and
displays
processor
information
Displays
processor
and memory
configuration
Configures
advanced
features
available
through the
chipset
Sets
passwords
and security
features
Table 43 lists the function keys available for menu screens.
Table 43. BIOS Setup Program Function Keys
BIOS Setup Program Function Key Description
<←> or <→>
<↑> or <↓>
<Tab> Selects a field (Not implemented)
<Enter> Executes command or selects the submenu
<F9> Load the default configuration values for the current menu
<F10> Save the current values and exits the BIOS Setup program
<Esc> Exits the menu
Selects a different menu screen (Moves the cursor left or right)
Selects an item (Moves the cursor up or down)
Configures
power
management
features and
power supply
controls
Selects boot
options
Saves or
discards
changes to
Setup
program
options
3.2 Resource Configuration
3.2.1 PCI Autoconfiguration
The BIOS automatically configures PCI devices. PCI devices may be onboard or add-in cards.
Autoconfiguration lets a user insert or remove PCI cards without having to configure the system.
When a user turns on the system after adding a PCI card, the BIOS automatically configures
interrupts, the I/O space, and other system resources. Any interrupts set to Available in Setup are
considered to be available for use by the add-in card.
3.2.2 PCI IDE Support
If you select Auto in the BIOS Setup program, the BIOS automatically sets up the
PCI IDE connector with independent I/O channel support. The IDE interface supports hard drives
up to ATA-66/100 and recognizes any ATAPI compliant devices, including CD-ROM drives, tape
drives, and Ultra DMA drives. The interface also supports second-generation SATA drives. The
BIOS determines the capabilities of each drive and configures them to optimize capacity and
performance. To take advantage of the high capacities typically available today, hard drives are
automatically configured for Logical Block Addressing (LBA) and to PIO Mode 3 or 4, depending
on the capability of the drive. You can override the auto-configuration options by specifying
manual configuration in the BIOS Setup program.
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Overview of BIOS Features
To use ATA-66/100 features the following items are required:
• An ATA-66/100 peripheral device
• An ATA-66/100 compatible cable
• ATA-66/100 operating system device drivers
NOTE
Do not connect an ATA device as a slave on the same IDE cable as an ATAPI master device. For
example, do not connect an ATA hard drive as a slave to an ATAPI CD-ROM drive.
3.3 System Management BIOS (SMBIOS)
SMBIOS is a Desktop Management Interface (DMI) compliant method for managing computers in
a managed network.
The main component of SMBIOS is the Management Information Format (MIF) database, which
contains information about the computing system and its components. Using SMBIOS, a system
administrator can obtain the system types, capabilities, operational status, and installation dates for
system components. The MIF database defines the data and provides the method for accessing this
information. The BIOS enables applications such as third-party management software to use
SMBIOS. The BIOS stores and reports the following SMBIOS information:
• BIOS data, such as the BIOS revision level
• Fixed-system data, such as peripherals, serial numbers, and asset tags
• Resource data, such as memory size, cache size, and processor clock frequency
• Dynamic data, such as event detection and error logging
Non-Plug and Play operating systems, such as Windows NT*, require an additional interface for
obtaining the SMBIOS information. The BIOS supports an SMBIOS table interface for such
operating systems. Using this support, an SMBIOS service-level application running on a
non-Plug and Play operating system can obtain the SMBIOS information.
3.4 Legacy USB Support
Legacy USB support enables USB devices to be used even when the operating system’s USB
drivers are not yet available. Legacy USB support is used to access the BIOS Setup program, and
to install an operating system that supports USB.
Legacy USB support operates as follows:
1. When you apply power to the computer, legacy support is disabled.
2. POST begins.
3. Legacy USB support is enabled by the BIOS allowing you to use a USB keyboard to enter and
configure the BIOS Setup program and the maintenance menu.
4. POST completes.
5. The operating system loads. While the operating system is loading, USB keyboards and mice
are recognized and may be used to configure the operating system.
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Intel Desktop Board D955XBK Technical Product Specification
6. After the operating system loads the USB drivers, all legacy and non-legacy USB devices are
recognized by the operating system, and Legacy USB support from the BIOS is no longer used.
To install an operating system that supports USB, follow the operating system’s installation
instructions.
3.5 BIOS Updates
The BIOS can be updated using either of the following utilities, which are available on the Intel
World Wide Web site:
• Intel
• Intel
Both utilities verify that the updated BIOS matches the target system to prevent accidentally
installing an incompatible BIOS.
®
Express BIOS Update utility, which enables automated updating while in the Windows
environment. Using this utility, the BIOS can be updated from a file on a hard disk, a 1.44 MB
diskette, or a CD-ROM, or from the file location on the Web.
®
Flash Memory Update Utility, which requires creation of a boot diskette and manual
rebooting of the system. Using this utility, the BIOS can be updated from a file on a 1.44 MB
diskette or a CD-ROM.
NOTE
Review the instructions distributed with the upgrade utility before attempting a BIOS update.
For information about Refer to
The Intel World Wide Web site Section 1.2, page 15
3.5.1 Language Support
The BIOS Setup program and help messages are supported in US English. Additional languages
are available in the Integrator’s Toolkit utility. Check the Intel website for details.
3.5.2 Custom Splash Screen
During POST, an Intel® splash screen is displayed by default. This splash screen can be augmented
with a custom splash screen. The Integrator’s Toolkit that is available from Intel can be used to
create a custom splash screen.
NOTE
If you add a custom splash screen, it will share space with the Intel branded logo.
For information about
The Intel World Wide Web site Section 1.2, page 15
Refer to
84
Overview of BIOS Features
3.6 Boot Options
In the BIOS Setup program, the user can choose to boot from a diskette drive, hard drives,
CD-ROM, or the network. The default setting is for the diskette drive to be the first boot device,
the hard drive second, and the ATAPI CD-ROM third. The fourth device is disabled.
3.6.1 CD-ROM Boot
Booting from CD-ROM is supported in compliance to the El Torito bootable CD-ROM format
specification. Under the Boot menu in the BIOS Setup program, ATAPI CD-ROM is listed as a
boot device. Boot devices are defined in priority order. Accordingly, if there is not a bootable CD
in the CD-ROM drive, the system will attempt to boot from the next defined drive.
3.6.2 Network Boot
The network can be selected as a boot device. This selection allows booting from the onboard LAN
or a network add-in card with a remote boot ROM installed.
Pressing the <F12> key during POST automatically forces booting from the LAN. To use this key
during POST, the User Access Level in the BIOS Setup program's Security menu must be
set to Full.
3.6.3 Booting Without Attached Devices
For use in embedded applications, the BIOS has been designed so that after passing the POST, the
operating system loader is invoked even if the following devices are not present:
• Video adapter
• Keyboard
• Mouse
3.6.4 Changing the Default Boot Device During POST
Pressing the <F10> key during POST causes a boot device menu to be displayed. This menu
displays the list of available boot devices (as set in the BIOS setup program’s Boot Device Priority
Submenu). Table 44 lists the boot device menu options.
Table 44. Boot Device Menu Options
Boot Device Menu Function Keys Description
<↑> or <↓>
<Enter> Exits the menu, saves changes, and boots from the selected device
<Esc> Exits the menu without saving changes
Selects a default boot device
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Intel Desktop Board D955XBK Technical Product Specification
3.7 Fast Booting Systems with Intel® Rapid BIOS Boot
These factors affect the amount of time for a system to complete boot process:
• Selecting and configuring peripherals properly
• Using an optimized BIOS, such as the Intel
3.7.1 Peripheral Selection and Configuration
The following techniques help reduce system boot time:
• Choose a hard drive with parameters such as “power-up to data ready” less than eight seconds,
that minimize hard drive startup delays.
• Select a CD-ROM drive with a fast initialization rate. This rate can influence POST
execution time.
• Eliminate unnecessary add-in adapter features, such as logo displays, screen repaints, or mode
changes in POST. These features may add time to the boot process.
• Try different monitors. Some monitors initialize and communicate with the BIOS more
quickly, which enables the system to boot more quickly.
®
Rapid BIOS
3.7.2 Intel Rapid BIOS Boot
Use of the following BIOS Setup program settings reduces the POST execution time.
In the Boot Menu:
• Set the hard disk drive as the first boot device. As a result, the POST does not first seek a
diskette drive, which saves about one second from the POST execution time.
• Disable Quiet Boot, which eliminates display of the logo splash screen. This could save several
seconds of painting complex graphic images and changing video modes.
• Enable Intel Rapid BIOS Boot. This feature bypasses memory count and the search for a
diskette drive.
In the Peripheral Configuration submenu, disable the LAN device if it will not be used. This can
reduce up to four seconds of option ROM boot time.
NOTE
It is possible to optimize the boot process to the point where the system boots so quickly that the
Intel logo screen (or a custom logo splash screen) will not be seen. Monitors and hard disk drives
with minimum initialization times can also contribute to a boot time that might be so fast that
necessary logo screens and POST messages cannot be seen.
This boot time may be so fast that some drives might be not be initialized at all. If this condition
should occur, it is possible to introduce a programmable delay ranging from three to 30 seconds
(using the Hard Disk Pre-Delay feature of the Advanced Menu in the Drive Configuration Submenu
of the BIOS Setup program).
86
Overview of BIOS Features
3.8 BIOS Security Features
The BIOS includes security features that restrict access to the BIOS Setup program and who can
boot the computer. A supervisor password and a user password can be set for the BIOS Setup
program and for booting the computer, with the following restrictions:
• The supervisor password gives unrestricted access to view and change all the Setup options in
the BIOS Setup program. This is the supervisor mode.
• The user password gives restricted access to view and change Setup options in the BIOS Setup
program. This is the user mode.
• If only the supervisor password is set, pressing the <Enter> key at the password prompt of the
BIOS Setup program allows the user restricted access to Setup.
• If both the supervisor and user passwords are set, users can enter either the supervisor password
or the user password to access Setup. Users have access to Setup respective to which password
is entered.
• Setting the user password restricts who can boot the computer. The password prompt will be
displayed before the computer is booted. If only the supervisor password is set, the computer
boots without asking for a password. If both passwords are set, the user can enter either
password to boot the computer.
• For enhanced security, use different passwords for the supervisor and user passwords.
• Valid password characters are A-Z, a-z, and 0-9. Passwords may be up to 16 characters in
length.
Table 45 shows the effects of setting the supervisor password and user password. This table is for
reference only and is not displayed on the screen.
Table 45. Supervisor and User Password Functions
Password Set
Neither Can change all
Supervisor
only
User only N/A Can change all
Supervisor
and user set
Note: If no password is set, any user can change all Setup options.
Supervisor
Mode
(Note)
options
Can change all
options
Can change all
options
User Mode Setup Options
Can change all
options
Can change a
limited number
of options
options
Can change a
limited number
of options
(Note)
None None None
Supervisor Password Supervisor None
Enter Password
Clear User Password
Supervisor Password
Enter Password
Password to
Enter Setup
User User
Supervisor or
user
Password
During Boot
Supervisor or
user
87
Intel Desktop Board D955XBK Technical Product Specification
88
4 Error Messages and Beep Codes
What This Chapter Contains
4.1 Speaker........................................................................................................................89
4.2 BIOS Beep Codes........................................................................................................89
4.3 BIOS Error Messages..................................................................................................89
4.4 Port 80h POST Codes .................................................................................................90
4.1 Speaker
The board-mounted speaker provides audible error code (beep code) information during POST.
For information about Refer to
The location of the onboard speaker Figure 1, page 12
4.2 BIOS Beep Codes
Whenever a recoverable error occurs during POST, the BIOS displays an error message describing
the problem (see Table 46).
Table 46. Beep Codes
Type Pattern Frequency
Memory error Three long beeps 1280 Hz
Thermal warning Four alternating beeps:
High tone, low tone, high tone, low tone
High tone: 2000 Hz
Low tone: 1600 Hz
4.3 BIOS Error Messages
Table 47 lists the error messages and provides a brief description of each.
Table 47. BIOS Error Messages
Error Message Explanation
CMOS Battery Low The battery may be losing power. Replace the battery soon.
CMOS Checksum Bad The CMOS checksum is incorrect. CMOS memory may have
been corrupted. Run Setup to reset values.
Memory Size Decreased Memory size has decreased since the last boot. If no memory was
removed then memory may be bad.
No Boot Device Available System did not find a device to boot.
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Intel Desktop Board D955XBK Technical Product Specification
4.4 Port 80h POST Codes
During the POST, the BIOS generates diagnostic progress codes (POST-codes) to I/O port 80h. If
the POST fails, execution stops and the last POST code generated is left at port 80h. This code is
useful for determining the point where an error occurred.
Displaying the POST-codes requires a PCI bus add-in card, often called a POST card. The POST
card can decode the port and display the contents on a medium such as a seven-segment display.
NOTE
The POST card must be installed in PCI bus connector 1.
The following tables provide information about the POST codes generated by the BIOS:
• Table 48 lists the Port 80h POST code ranges
• Table 49 lists the Port 80h POST codes themselves
• Table 50 lists the Port 80h POST sequence
NOTE
In the tables listed above, all POST codes and range values are listed in hexadecimal.
Table 48. Port 80h POST Code Ranges
Range Category/Subsystem
00 – 0F Debug codes: Can be used by any PEIM/driver for debug.
10 – 1F Host Processors: 1F is an unrecoverable CPU error.
20 – 2F Memory/Chipset: 2F is no memory detected or no useful memory detected.
30 – 3F Recovery: 3F indicated recovery failure.
40 – 4F Reserved for future use.
50 – 5F I/O Busses: PCI, USB, ISA, ATA, etc. 5F is an unrecoverable error. Start with PCI.
60 – 6F Reserved for future use (for new busses).
70 – 7F Output Devices: All output consoles. 7F is an unrecoverable error.
80 – 8F Reserved for future use (new output console codes).
90 – 9F Input devices: Keyboard/Mouse. 9F is an unrecoverable error.
A0 – AF Reserved for future use (new input console codes).
B0 – BF Boot Devices: Includes fixed media and removable media. BF is an unrecoverable error.
C0 – CF Reserved for future use.
D0 – DF Boot device selection.
E0 – FF F0 – FF: FF processor exception.
E0 – EE: Miscellaneous codes. See Table 49.
EF boot/S3: resume failure.
90
Error Messages and Beep Codes
Table 49. Port 80h POST Codes
POST Code Description of POST Operation
10 Power-on initialization of the host processor (Boot Strap Processor)
11 Host processor Cache initialization (including APs)
12 Starting Application processor initialization
13 SMM initialization
21 Initializing a chipset component
22 Reading SPD from memory DIMMs
23 Detecting presence of memory DIMMs
24 Programming timing parameters in the memory controller and the DIMMs
25 Configuring memory
26 Optimizing memory settings
27 Initializing memory, such as ECC init
28 Testing memory
50 Enumerating PCI busses
51 Allocating resources to PCI bus
52 Hot Plug PCI controller initialization
53 – 57 Reserved for PCI Bus
58 Resetting USB bus
59 Reserved for USB
5A Resetting PATA/SATA bus and all devices
5B Reserved for ATA
5C Resetting SMBUS
5D Reserved for SMBUS
70 Resetting the VGA controller
71 Disabling the VGA controller
72 Enabling the VGA controller
78 Resetting the console controller
79 Disabling the console controller
7A Enabling the console controller
Host Processor
Chipset
Memory
PCI Bus
USB
ATA/ATAPI/SATA
SMBus
Local Console
Remote Console
continued
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Intel Desktop Board D955XBK Technical Product Specification
Table 49. Port 80h POST Codes (continued)
POST Code Description of POST Operation
90 Resetting keyboard
91 Disabling the keyboard
92 Detecting the presence of the keyboard
93 Enabling the keyboard
94 Clearing keyboard input buffer
95 Instructing keyboard controller to run Self Test (PS2 only)
98 Resetting mouse
99 Detecting mouse
9A Detecting presence of mouse
9B Enabling mouse
B0 Resetting fixed media
B1 Disabling fixed media
B2 Detecting presence of a fixed media (IDE hard drive det ection etc.)
B3 Enabling/configuring a fixed media
B8 Resetting removable media
B9 Disabling removable media
BA Detecting presence of a removable media (IDE, CD-ROM detection, etc.)
BC Enabling/configuring a removable media
Dy Trying boot selection y (y=0 to 15)
E0 Started dispatching PEIMs (emitted on first report of EFI_SW_PC_INIT_BEGIN
EFI_SW_PEI_PC_HANDOFF_TO_NEXT
E2 Permanent memory found.
E1, E3 Reserved for PEI/PEIMs
E4 Entered DXE phase
E5 Started dispatching drivers
E6 Started connecting drivers
Keyboard (PS2 or USB)
Mouse (PS2 or USB)
Fixed Media
Removable media
PEI Core
DXE Core
BDS
continued
92
Table 49. Port 80h POST Codes (continued)
POST Code Description of POST Operation
E7 Waiting for user input
E8 Checking password
E9 Entering BIOS setup
EA TBD – Flash Update
EB Calling Legacy Option ROMs
EE TBD – Calling INT 19. One beep unless silent boot is enabled.
EF TBD – Unrecoverable Boot failure/S3 resume failure
Runtime Phase/EFI OS Boot
F4 Entering Sleep state
F5 Exiting Sleep state
F8 EFI boot service ExitBootServices ( ) has been called
F9 EFI runtime service SetVirtualAddressMap ( ) has been called
FA EFI runtime service ResetSystem ( ) has been called
30 Crisis Recovery has initiated per User request
31 Crisis Recovery has initiated by software (corrupt flash)
34 Loading recovery capsule
35 Handing off control to the recovery capsule
3F Unable to recover
DXE Drivers
PEIMs/Recovery
Error Messages and Beep Codes
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Intel Desktop Board D955XBK Technical Product Specification
Table 50. Typical Port 80h POST Sequence
POST Code Description
21 Initializing a chipset component
22 Reading SPD from memory DIMMs
23 Detecting presence of memory DIMMs
25 Configuring memory
28 Testing memory
34 Loading recovery capsule
E4 Entered DXE phase
12 Starting Application processor initialization
13 SMM initialization
50 Enumerating PCI busses
51 Allocating resourced to PCI bus
92 Detecting the presence of the keyboard
90 Resetting keyboard
94 Clearing keyboard input buffer
95 Keyboard Self Test
EB Calling Video BIOS
58 Resetting USB bus
5A Resetting PATA/SATA bus and all devices
92 Detecting the presence of the keyboard
90 Resetting keyboard
94 Clearing keyboard input buffer
5A Resetting PATA/SATA bus and all devices
28 Testing memory
90 Resetting keyboard
94 Clearing keyboard input buffer
E7 Waiting for user input
01 INT 19
00 Ready to boot.
94
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