Intel BLKD915GMHLK - LGA775 800FSB Dual DDR400 GIG Lan PCI Express mBTX 10, BOXD915GMHL, D915GMH Technical Product Specification
Intel® Desktop Board
D915GMH
Technical Product Specification
The Intel® Desktop Board D915GMH 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 D915GMH Specification Update.
December 2004
Order Number: C81296-001
Revision History
Revision Revision History Date
-001 First release of the Intel® Desktop Board D915GMH Technical Product
Specification.
December 2004
This product specification applies to only standard Intel
®
Desktop Board D915GMH with BIOS
identifier EV91510A.86A.
Changes to this specification will be published in the Intel Desktop Board D915GMH 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
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provide any license, express or implied, by estoppel or otherwise, to any such patents, trademarks, copyrights, or other
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.
Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be
obtained from:
Intel Corporation
P.O. Box 5937
Denver, CO 80217-9808
or call in North America 1-800-548-4725, Europe 44-0-1793-431-155, France 44-0-1793-421-777,
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* Other names and brands may be claimed as the property of others.
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 Desktop Board D915GMH
and their components to the vendors, system integrators, and other engineers and technicians who
need this level of information. It is specifically not intended for general audiences.
What This Document Contains
Chapter Description
1 A description of the hardware used on the Desktop Board D915GMH
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 D915GMH. 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 D915GMH 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 D915GMH, and X is the instance of the
particular part at that general location. For example, J5J1 is a connector, located at 5J. It is
the first connector in the 5J area.
GB Gigabyte (1,073,741,824 bytes)
GB/sec Gigabytes per second
KB Kilobyte (1024 bytes)
Kbit Kilobit (1024 bits)
kbits/sec 1000 bits per second
MB Megabyte (1,048,576 bytes)
MB/sec Megabytes per second
Mbit Megabit (1,048,576 bits)
Mbit/sec Megabits per second
xxh An address or data value ending with a lowercase h indicates a hexadecimal value.
x.x V Volts. Voltages are DC unless otherwise specified.
* This symbol is used to indicate third-party brands and names that are the property of their
respective owners.
iv
Contents
1 Product Description
1.1 PCI Bus Terminology Change...................................................................................... 11
1.2 Power Connector Terminology Change .......................................................................11
1.3 Overview ...................................................................................................................... 12
1.3.1 Feature Summary.......................................................................................... 12
1.3.2 Manufacturing Options ..................................................................................13
1.3.3 Board Layout ................................................................................................. 14
1.3.4 Block Diagram ............................................................................................... 16
1.4 Online Support ............................................................................................................. 17
1.5 Processor .....................................................................................................................17
1.6 System Memory ........................................................................................................... 18
1.6.1 Memory Configurations .................................................................................20
1.7 Intel® 915G Chipset ..................................................................................................... 24
1.7.1 Intel 915G Graphics Subsystem.................................................................... 24
1.7.2 USB ............................................................................................................... 26
1.7.3 IDE Support ...................................................................................................26
1.7.4 Real-Time Clock, CMOS SRAM, and Battery................................................ 28
1.8 PCI Express Connectors.............................................................................................. 28
1.9 I/O Controller................................................................................................................ 29
1.9.1 Serial Port...................................................................................................... 29
1.9.2 Parallel Port ...................................................................................................29
1.9.3 Diskette Drive Controller................................................................................ 29
1.9.4 Keyboard and Mouse Interface .....................................................................30
1.10 Audio Subsystem ......................................................................................................... 30
1.10.1 Audio Subsystem Software ...........................................................................31
1.10.2 Audio Connectors ..........................................................................................31
1.10.3 8-Channel (7.1) Audio Subsystem................................................................. 32
1.10.4 6-Channel (5.1) Audio Subsystem................................................................. 34
1.11 LAN Subsystem ...........................................................................................................35
1.11.1 10/100 Mbits/sec LAN Subsystem................................................................. 35
1.11.2 Gigabit LAN Subsystem ................................................................................36
1.11.3 Alert Standard Format (ASF) Support ........................................................... 37
1.11.4 LAN Subsystem Software.............................................................................. 38
1.12 Hardware Management Subsystem............................................................................. 38
1.12.1 Hardware Monitoring and Fan Control ASIC ................................................. 38
1.12.2 Thermal Monitoring........................................................................................ 39
1.12.3 Fan Monitoring............................................................................................... 40
1.12.4 Chassis Intrusion and Detection.................................................................... 40
1.13 Power Management .....................................................................................................40
1.13.1 ACPI .............................................................................................................. 40
1.13.2 Hardware Support .........................................................................................42
1.14 Trusted Platform Module (Optional) .............................................................................46
1.14.1 System Requirements ................................................................................... 46
1.14.2 Warning of Potential Data Loss .....................................................................46
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Intel Desktop Board D915GMH Technical Product Specification
1.14.3 Security Precautions...................................................................................... 47
1.14.4 Trusted Platform Module Ownership ............................................................. 48
1.14.5 Enabling the Trusted Platform Module .......................................................... 49
1.14.6 Assuming Trusted Platform Module Ownership ............................................ 49
1.14.7 Recovery Procedures ....................................................................................50
1.14.8 Clearing Trusted Platform Module Ownership............................................... 51
1.14.9 Software Support........................................................................................... 52
2 Technical Reference
2.1 Introduction ..................................................................................................................53
2.2 Memory Resources ......................................................................................................53
2.2.1 Addressable Memory..................................................................................... 53
2.2.2 Memory Map.................................................................................................. 55
2.3 DMA Channels .............................................................................................................55
2.4 Fixed I/O Map............................................................................................................... 56
2.5 PCI Configuration Space Map...................................................................................... 57
2.6 Interrupts ......................................................................................................................58
2.7 PCI Conventional Interrupt Routing Map .....................................................................59
2.8 Connectors................................................................................................................... 60
2.8.1 Back Panel Connectors .................................................................................60
2.8.2 Component-side Connectors......................................................................... 64
2.9 Jumper Block ...............................................................................................................72
2.10 Mechanical Considerations .......................................................................................... 73
2.10.1 Form Factor ...................................................................................................73
2.10.2 I/O Shield....................................................................................................... 74
2.11 Electrical Considerations.............................................................................................. 76
2.11.1 DC Loading.................................................................................................... 76
2.11.2 Add-in Board Considerations......................................................................... 76
2.11.3 Fan Connector Current Capability .................................................................76
2.11.4 Power Supply Considerations .......................................................................77
2.12 Thermal Considerations ...............................................................................................77
2.13 Reliability...................................................................................................................... 79
2.14 Environmental .............................................................................................................. 80
2.15 Regulatory Compliance................................................................................................ 81
2.15.1 Safety Regulations ........................................................................................81
2.15.2 EMC Regulations........................................................................................... 81
2.15.3 European Union Declaration of Conformity Statement.................................. 82
2.15.4 Product Ecology Statements ......................................................................... 83
2.15.5 Product Certification Markings (Board Level) ................................................84
3 Overview of BIOS Features
3.1 Introduction ..................................................................................................................85
3.2 BIOS Flash Memory Organization ...............................................................................86
3.3 Resource Configuration ...............................................................................................86
3.3.1 PCI Autoconfiguration.................................................................................... 86
3.3.2 PCI IDE Support ............................................................................................86
3.4 System Management BIOS (SMBIOS) ........................................................................87
3.5 Legacy USB Support.................................................................................................... 87
vi
3.6 BIOS Updates .............................................................................................................. 88
3.6.1 Language Support .........................................................................................88
3.6.2 Custom Splash Screen.................................................................................. 88
3.7 Boot Options ................................................................................................................89
3.7.1 CD-ROM Boot ...............................................................................................89
3.7.2 Network Boot .................................................................................................89
3.7.3 Booting Without Attached Devices ................................................................ 89
3.7.4 Changing the Default Boot Device During POST .......................................... 89
3.8 Fast Booting Systems with Intel® Rapid BIOS Boot ....................................................90
3.8.1 Peripheral Selection and Configuration .........................................................90
3.8.2 Intel Rapid BIOS Boot ...................................................................................90
3.9 BIOS Security Features ...............................................................................................91
4 Error Messages and Beep Codes
4.1 BIOS Error Messages .................................................................................................. 93
4.2 Port 80h POST Codes .................................................................................................95
4.3 Bus Initialization Checkpoints ......................................................................................99
4.4 Speaker...................................................................................................................... 100
4.5 BIOS Beep Codes...................................................................................................... 100
Contents
Figures
1. Board Components ...................................................................................................... 14
2. Block Diagram.............................................................................................................. 16
3. Memory Channel Configuration ...................................................................................20
4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs .............................. 21
5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs............................ 21
6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs.............................. 22
7. Single Channel (Asymmetric) Mode Configuration with One DIMM............................. 23
8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs ........................ 23
9. Front/Back Panel Audio Connector Options for 8-Channel (7.1) Audio Subsystem .... 32
10. 8-channel (7.1) Audio Subsystem Block Diagram........................................................ 33
11. Front/Back Panel Audio Connector Options for 6-Channel (5.1) Audio Subsystem .... 34
12. 6-Channel (5.1) Audio Subsystem Block Diagram....................................................... 34
13. LAN Connector LED Locations .................................................................................... 35
14. LAN Connector LED Locations .................................................................................... 36
15. Thermal Monitoring ......................................................................................................39
16. Location of the Standby Power Indicator LED .............................................................45
17. Detailed System Memory Address Map....................................................................... 54
18. Back Panel Connectors for 8-Channel (7.1) Audio Subsystem ...................................61
19. Back Panel Connectors for 6-Channel (5.1) Audio Subsystem ...................................62
20. Component-side Connectors ....................................................................................... 64
21. Connection Diagram for Front Panel Connector ..........................................................69
22. Connection Diagram for Front Panel USB Connectors................................................ 71
23. Connection Diagram for IEEE 1394a Connectors........................................................ 71
24. Location of the Jumper Block....................................................................................... 72
25. Board Dimensions........................................................................................................ 73
26. I/O Shield Dimensions for Boards with the 8-channel (7.1) Audio Subsystem ............74
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Intel Desktop Board D915GMH Technical Product Specification
27. I/O Shield Dimensions for Boards with the 6-channel (5.1) Audio Subsystem ............75
28. Localized High Temperature Zones .............................................................................78
Tables
1. Feature Summary ........................................................................................................12
2. Manufacturing Options .................................................................................................13
3. Board Components Shown in Figure 1 ........................................................................ 15
4. Supported System Bus Frequency and Memory Speed Combinations ....................... 18
5. Supported Memory Configurations ..............................................................................19
6. LAN Connector LED States .........................................................................................36
7. LAN Connector LED States .........................................................................................37
8. Effects of Pressing the Power Switch ..........................................................................41
9. Power States and Targeted System Power ................................................................. 41
10. Wake-up Devices and Events ......................................................................................42
11. System Memory Map ................................................................................................... 55
12. DMA Channels .............................................................................................................55
13. I/O Map ........................................................................................................................56
14. PCI Configuration Space Map...................................................................................... 57
15. Interrupts ......................................................................................................................58
16. PCI Interrupt Routing Map ...........................................................................................59
17. Back Panel Connectors Shown in Figure 18................................................................ 61
18. Back Panel Connectors Shown in Figure 19................................................................ 63
19. Component-side Connectors Shown in Figure 20 .......................................................65
20. S/PDIF Connector (Optional) ....................................................................................... 65
21. ATAPI CD-ROM Connector (Optional)......................................................................... 65
22. Front Panel Audio Connector....................................................................................... 66
23. Front Chassis Fan and Rear Chassis Fan Connectors................................................ 66
24. Processor Fan Connector ............................................................................................ 66
25. Chassis Intrusion Connector ........................................................................................66
26. Serial ATA Connectors................................................................................................. 66
27. Main Power Connector................................................................................................. 67
28. Processor Core Power Connector ...............................................................................68
29. Alternate Power Connector ..........................................................................................68
30. Auxiliary Front Panel Power/Sleep LED Connector .....................................................69
31. Front Panel Connector .................................................................................................69
32. States for a One-Color Power LED ..............................................................................70
33. States for a Two-Color Power LED ..............................................................................70
34. BIOS Setup Configuration Jumper Settings................................................................. 72
35. DC Loading Characteristics .........................................................................................76
36. Fan Connector Current Capability................................................................................ 76
37. Thermal Considerations for Components ....................................................................79
38. Environmental Specifications .......................................................................................80
39. Safety Regulations .......................................................................................................81
40. EMC Regulations ......................................................................................................... 81
41. Product Certification Markings ..................................................................................... 84
42. BIOS Setup Program Menu Bar................................................................................... 86
43. BIOS Setup Program Function Keys............................................................................ 86
viii
Contents
44. Boot Device Menu Options ..........................................................................................89
45. Supervisor and User Password Functions ...................................................................91
46. BIOS Error Messages .................................................................................................. 93
47. Uncompressed INIT Code Checkpoints....................................................................... 95
48. Boot Block Recovery Code Checkpoints .....................................................................95
49. Runtime Code Uncompressed in F000 Shadow RAM ................................................. 96
50. Bus Initialization Checkpoints ......................................................................................99
51. Upper Nibble High Byte Functions ...............................................................................99
52. Lower Nibble High Byte Functions .............................................................................100
53. Beep Codes ...............................................................................................................100
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Intel Desktop Board D915GMH Technical Product Specification
x
1 Product Description
What This Chapter Contains
1.1 PCI Bus Terminology Change...................................................................................... 11
1.2 Power Connector Terminology Change .......................................................................11
1.3 Overview ...................................................................................................................... 12
1.4 Online Support ............................................................................................................. 17
1.5 Processor .....................................................................................................................17
1.6 System Memory ........................................................................................................... 18
1.7 Intel® 915G Chipset ..................................................................................................... 24
1.8 PCI Express Connectors.............................................................................................. 28
1.9 I/O Controller................................................................................................................ 29
1.10 Audio Subsystem ......................................................................................................... 30
1.11 LAN Subsystem ...........................................................................................................35
1.12 Hardware Management Subsystem............................................................................. 38
1.13 Power Management .....................................................................................................40
1.14 Trusted Platform Module (Optional) .............................................................................46
1.1 PCI Bus Terminology Change
Previous generations of Intel® Desktop Boards used an add-in card connector referred to as PCI.
This generation of Intel Desktop Boards adds a new technology for add-in cards: PCI Express*.
The 32-bit parallel bus previously referred to as PCI is now called PCI Conventional.
1.2 Power Connector Terminology Change
Technical Product Specifications for ATX and microATX desktop boards referred to the 2 x 2
power connector as the ATX12V connector. With the arrival of BTX form factor desktop boards,
this connector will henceforth be referred to as the Processor Core Power connector.
For information about Refer to
The BTX form factor http://www.formfactors.org
11
Intel Desktop Board D915GMH Technical Product Specification
1.3 Overview
1.3.1 Feature Summary
Table 1 summarizes the major features of the Desktop Board D915GMH.
Table 1. Feature Summary
Form Factor microBTX Form Factor (10.50 inches by 10.40 inches [266.70 millimeters by
264.16 millimeters])
Processor Support for an Intel® Pentium® 4 processor in an LGA775 socket with an 800 or
533 MHz system bus
Memory
Chipset
Video Intel® GMA900 onboard graphics subsystem
I/O Control LPC Bus I/O controller
USB Support for USB 2.0 devices
Peripheral
Interfaces
BIOS
Instantly Available
PC Technology
• Four DDR SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for DDR 400 MHz and DDR 333 MHz DIMMs
• Support for up to 4 GB of system memory
®
Intel
915G Chipset, consisting of:
®
• Intel
• Intel
• 4 Mbit Firmware Hub (FWH)
• Eight USB ports
• One serial port
• One parallel port
• Four Serial ATA interfaces
• One Parallel ATA IDE interface with UDMA 33, ATA-66/100 support
• One diskette drive interface
• PS/2* keyboard and mouse ports
• Intel/AMI BIOS (resident in the 4 Mbit FWH)
• 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
82915G Graphics Memory Controller Hub (GMCH)
®
82801FB I/O Controller Hub (ICH6)
and SMBIOS
continued
12
Table 1. Feature Summary (continued)
Expansion
Capabilities
Hardware Monitor
Subsystem
• Two PCI Conventional bus add-in card connectors (SMBus routed to PCI
Conventional bus connector 2)
• One PCI Express x1 bus add-in card connector
• One PCI Express x16 bus add-in card connector
• 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
1.3.2 Manufacturing Options
Table 2 describes the manufacturing options on the Desktop Board D915GMH. Not every
manufacturing option is available in all marketing channels. Please contact your Intel
representative to determine which manufacturing options are available to you.
Product Description
Table 2. Manufacturing Options
ATAPI CD-ROM
Connector
Audio Subsystem Intel® High Definition Audio subsystem in one of the following configurations:
IEEE-1394a
Interface
LAN One of the following:
RAID support RAID 0 and RAID 1 support with optional ICH6-R
Security Trusted Platform Module (TPM): a component that enhances platform security
S/PDIF Connector A 1 x 3 connector mounted on the component side of the board that provides digital
A connector for attaching an internal CD-ROM drive to the onboard audio subsystem
• 8-channel (7.1) audio subsystem with five analog audio outputs using the
• 6-channel (5.1) audio subsystem with three analog audio outputs using the
IEEE-1394a controller and two IEEE-1394a connectors (one back panel connector
and one front-panel connector)
• 10/100 Mbits/sec LAN subsystem using the Intel
• Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the Marvell* Yukon*
audio signals in S/PDIF format
For information about Refer to
Available configurations for the Desktop Board D915GMH Section 1.4, page 17
Realtek ALC880 audio codec
Realtek ALC860 audio codec
(PLC) device
88E8050 PCI Express Gigabit Ethernet Controller
®
82562EZ Platform LAN Connect
13
Intel Desktop Board D915GMH Technical Product Specification
1.3.3 Board Layout
Figure 1 shows the location of the major components on the Desktop Board D915GMH.
Line In
D
C
A
B
RJ45
X
W
V
U
T
S
RR
Q
PP
Intel
(GMCH)
Intel
(ICH)
R
82915G
R
82801
OO
N
MM
E
F
G
H
I
J
K
L
14
Figure 1. Board Components
OM17544
Table 3 lists the components identified in Figure 1.
Table 3. Board Components Shown in Figure 1
Item/Callout
from Figure 1 Description
A Front panel audio connector
B Chassis intrusion connector
C Main power connector (2 x 12)
D Front Panel USB connectors
E PCI Express x1 connector
F PCI bus add-in card connectors
G PCI Express x16 connector
H Alternate power connector (1 x 4)
I Diskette drive connector
J BIOS Setup Configuration Jumper
K IEEE 1394a connectors (optional)
L Front chassis fan connector
M Front panel connector
N Alternate power LED connector
O Processor socket
P Processor core power connector (2 x 2)
Q Processor fan header (4-pin, fan speed control)
R DIMM sockets
S Battery
T IDE connector
U ATAPI CD-ROM connector (optional)
V Rear chassis fan connector
W S/PDIF connector (optional)
X Serial ATA connectors (four)
Product Description
15
Intel Desktop Board D915GMH Technical Product Specification
1.3.4 Block Diagram
Figure 2 is a block diagram of the major functional areas of the board.
PCI Express x1 Slot 1
Parallel ATA
IDE Connector
LGA775
Processor Socket
PCI Express
x16 Interface
PCI Express
x16
Connector
VGA
Port
Channel A
DIMMs (2)
Display Interface
PCI Express x1 Interface
Parallel ATA
IDE Interface
System Bus
(800/533 MHz)
Intel 82915G
Graphics and
Memory Controller
Hub (GMCH)
Dual-Channel
Memory Bus
SMBus
Gigabit Ethernet
Controller (Optional)
USB
LPC Bus
I/O
Controller
LPC Bus
Intel 82801FB
I/O Controller Hub
(ICH6)
DMI Interconnect
Back Panel/Front Panel
USB Ports
Serial Ports
Parallel Port
PS/2 Mouse
PS/2 Keyboard
Diskette Drive
4 Mbit
Firmware Hub
(FWH)
LAN
Connector
Connector
Intel 915G Chipset
LPC Bus
TPM Component
(Optional)
Interface
LAN Connect
Channel B
DIMMs (2)
IEEE-1394a Connectors
(Optional)
PCI Slot 1
PCI Slot 2
= connector or socket
PCI Bus
PCI Bus
SMBus
Hardware Monitoring
and Fan Control ASIC
Figure 2. Block Diagram
10/100 LAN PLC
(Optional)
Serial ATA
High Definition Audio Link
IDE Interface
Audio
Codec
Mic In/Retasking Jack B
Line In/Retasking Jack C
Line Out/Retasking Jack D
Retasking Jack E [Port 1]
Retasking Jack F [Port 2]
CD-ROM (optional)
S/PDIF (optional)
Serial ATA IDE
Connectors (4)
LAN
Connector
OM17545
16
Product Description
1.4 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board D915GMH under
“Desktop Board Products” or “Desktop
Board Support”
Available configurations for the Desktop
Board D915GMH
Processor data sheets http://appzone.intel.com/literature/index.asp
ICH6 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/mh/mh_available.htm
1.5 Processor
The board is designed to support Intel Pentium 4 processors in an LGA775 processor socket with an
800 or 533 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 D915GMH board http://www.intel.com/design/motherbd/mh/mh_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
#
• Failure to use a BTX power supply, or not connecting the +12 V (2x2) processor core power
supply connector to the board may result in damage to the board and/or the power supply.
• Refer to Table 4 on page 18 for a list of supported system bus frequency and memory speed
combinations.
For information about Refer to
Power supply connectors Section 2.8.2.1, page 67
17
Intel Desktop Board D915GMH Technical Product Specification
1.6 System Memory
The board has four DIMM sockets and support the following memory features:
• 2.5 V (only) DDR SDRAM DIMMs with gold-plated contacts
• Unbuffered, single-sided or double-sided DIMMs with the following restriction:
Double-sided DIMMS with x16 organization are not supported.
• 4 GB maximum total system memory. Refer to Section 2.2.1 on page 53 for information on the
total amount of addressable memory.
• Minimum total system memory: 128 MB
• Non-ECC DIMMs
• Serial Presence Detect
• DDR 400 MHz and DDR 333 MHz SDRAM DIMMs
Table 4 lists the supported system bus frequency and memory speed combinations.
Table 4. Supported System Bus Frequency and Memory Speed Combinations
To use this type of DIMM… The processor's system bus frequency must be…
DDR 400 800 MHz
DDR 333 (Note) 800 or 533 MHz
Note: When using an 800 MHz system bus frequency processor, DDR 333 memory is clocked at 320 MHz. This minimizes
system latencies to optimize system throughput.
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.
18
Product Description
Table 5 lists the supported DIMM configurations.
Table 5. Supported Memory Configurations
DIMM
Capacity
128 MB SS 256 Mbit 16 M x 16/empty 4
256 MB SS 256 Mbit 32 M x 8/empty 8
256 MB SS 512 Mbit 32 M x 16/empty 4
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16
512 MB SS 512 Mbit 64 M x 8/empty 8
512 MB SS 1 Gbit 64 M x 16/empty 4
1024 MB DS 512 Mbit 64 M x 8/64 M x 8 16
1024 MB SS 1 Gbit 128 M x 8/empty 8
2048 MB DS 1 Gbit 128 M x 8/128 M x 8 16
Note: 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).
Configuration
SDRAM
Density
SDRAM Organization
Front-side/Back-side
Number of SDRAM
Devices
INTEGRATOR’S NOTE
#
It is possible to install four 2048 MB (2 GB) modules for a total of 8 GB of system memory,
however, only 4 GB of address space is available. Refer to Section 2.2.1, on page 53 for additional
information on available memory.
19
Intel Desktop Board D915GMH Technical Product Specification
1.6.1 Memory Configurations
The Intel 82915G GMCH 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.
DIMM 0
DIMM 1
DIMM 0
DIMM 1
R
82801
Intel
(ICH)
R
82915P
Intel
(GMCH)
Channel A
Channel B
Figure 3. Memory Channel Configuration
OM17182
20
1.6.1.1 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.
Product Description
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
Channel A, DIMM 0
Channel A, DIMM 1
512 MB
Channel B, DIMM 0
Channel B, DIMM 1
OM17122
Figure 5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs
21
Intel Desktop Board D915GMH Technical Product Specification
Figure 6 shows a dual channel configuration using four DIMMs. In this example, the combined
capacity of the two DIMMs in Channel A equal the combined capacity of the two DIMMs in
Channel B. Also, the DIMMs are matched between DIMM0 and DIMM1 of both channels.
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
22
Product Description
1.6.1.2 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
Channel A, DIMM 0
Channel A, DIMM 1
Figure 8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs
512 MB
Channel B, DIMM 0
Channel B, DIMM 1
OM17126
23
Intel Desktop Board D915GMH Technical Product Specification
1.7 Intel® 915G Chipset
The Intel 915G chipset consists of the following devices:
• Intel 82915G Graphics Memory Controller Hub (GMCH) with Direct Media Interface (DMI)
interconnect
• Intel 82801FB I/O Controller Hub (ICH6) with DMI interconnect
• Firmware Hub (FWH)
The MCH is a centralized controller for the system bus, the memory bus, the PCI Express bus, and
the DMI interconnect. The ICH6 is a centralized controller for the board’s I/O paths. The FWH
provides the nonvolatile storage of the BIOS.
For information about Refer to
The Intel 915G chipset http://developer.intel.com/
Resources used by the chipset Chapter 2
1.7.1 Intel 915G Graphics Subsystem
The Intel 915G chipset contains two separate, mutually exclusive graphics options. Either the
GMA900 graphics controller (contained within the 82915G GMCH) is used, or a PCI Express x16
add-in card can be used. When a PCI Express x16 add-in card is installed, the GMA900 graphics
controller is disabled.
1.7.1.1 Intel® GMA900 Graphics Controller
The Intel GMA900 graphics controller features the following:
• Integrated graphics controller
⎯ 32 bpp (Bits Per Pixel) graphics engine
⎯ 333 MHz core frequency
⎯ 256-bit 2-D engine
⎯ 32-bit 3-D engine
⎯ Motion video acceleration
⎯ Pixel Shader 2.0
⎯ 4-pixel pipes
⎯ DirectX 9.0 Hardware Acceleration
⎯ Software Vertex Shader
• Up to 2048 x 1536 at 75 Hz refresh
• With Advanced Digital Display 2 (ADD2-R) card support flat panel displays up to 2048 x 1536
at 75 Hz or digital CRTs/HDTV displays at 1920 x 1080 at 85 Hz
• High performance 3-D setup and render engine
• High quality/performance texture engine
• Display
⎯ Integrated 24-bit 400 MHz RAMDAC
⎯ DDC2B compliant interface
24
Product Description
• Video
⎯ Asynchronous dual monitor display with ADD2-R card
⎯ Hardware motion compensation for software MPEG2 decode
⎯ Two multiplexed DVO port interfaces with 200 MHz pixel clocks using an ADD2-R card
• Dynamic Video Memory Technology (DVMT) support up to 224 MB
®
• Intel
For information about Refer to
DVMT Section 1.7.1.2, page 25
Obtaining graphics software and utilities Section 1.4, page 17
Zoom Utility
1.7.1.2 Dynamic Video Memory Technology (DVMT)
DVMT enables enhanced graphics and memory performance through Direct AGP, and highly
efficient memory utilization. DVMT ensures the most efficient use of available system memory for
maximum 2-D/3-D graphics performance. Up to 224 MB of system memory can be allocated to
DVMT on systems that have 512 MB or more of total system memory installed. Up to 128 MB can
be allocated to DVMT on systems that have 256 MB but less than 512 MB of total installed system
memory. Up to 64 MB can be allocated to DVMT when less than 256 MB of system memory is
installed. DVMT returns system memory back to the operating system when the additional system
memory is no longer required by the graphics subsystem.
DVMT will always use a minimal fixed portion of system physical memory (as set in the BIOS
Setup program) for compatibility with legacy applications. An example of this would be when
using VGA graphics under DOS. Once loaded, the operating system and graphics drivers allocate
additional system memory to the graphics buffer as needed for performing graphics functions.
NOTE
The use of DVMT requires operating system driver support.
1.7.1.3 Advanced Digital Display 2 (ADD2-R) Card Support
The GMCH routes two multiplexed DVO ports that are each capable of driving up to a 200 MHz
pixel clock to the PCI Express x16 connector. The DVO ports can be paired for a dual channel
configuration to support up to a 400 MHz pixel clock. When an ADD2-R card is detected, the Intel
GMA900 graphics controller is enabled and the PCI Express x16 connector is configured for DVO
mode. DVO mode enables the DVO ports to be accessed by the ADD2-R card. An ADD2-R card
can either be configured to support simultaneous display with the primary VGA display or can be
configured to support dual independent display as an extended desktop configuration with different
color depths and resolutions. ADD2-R cards can be designed to support the following
configurations:
• TV-Out (composite video)
• Transition Minimized Differential Signaling (TMDS) for DVI 1.0
• Low Voltage Differential Signaling (LVDS)
• Single device operating in dual channel mode
• VGA output
• HDTV output
25
Intel Desktop Board D915GMH Technical Product Specification
NOTE
This board supports ADD2-R cards only. Other types of ADD2 cards are not compatible with this
board.
1.7.2 USB
The board supports up to eight USB 2.0 ports, supports UHCI and EHCI, and uses UHCI- and
EHCI-compatible drivers.
The ICH6 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 serial port
connector and the audio connectors
• Four ports are routed to two separate front panel USB connectors
NOTE
✏
Computer systems that have an unshielded cable attached to a USB port may not meet FCC
Class B requirements, even if no device is attached to the cable. Use shielded cable that meets the
requirements for full-speed devices.
For information about Refer to
The location of the USB connectors on the back panel Figure 19, page 62
The location of the front panel USB connectors Figure 20, page 64
1.7.3 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
1.7.3.1 Parallel ATE IDE Interface
The ICH6’s Parallel ATA IDE controller has one bus-mastering Parallel ATA IDE interface. The
Parallel ATA IDE interface supports the following modes:
• Programmed I/O (PIO): processor controls data transfer.
• 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec.
• Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates
of up to 33 MB/sec.
• ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates of
up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver compatible.
• ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH6’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.
26
Product Description
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.
The board supports Laser Servo (LS-120) diskette technology through the Parallel ATA IDE
interfaces. An LS-120 drive can be configured as a boot device by setting the BIOS Setup
program’s Boot menu to one of the following:
• ARMD-FDD (ATAPI removable media device – floppy disk drive)
• ARMD-HDD (ATAPI removable media device – hard disk drive)
For information about Refer to
The location of the Parallel ATA IDE connector Figure 20, page 64
1.7.3.2 Serial ATA Interfaces
The ICH6’s Serial ATA controller offers four independent Serial ATA ports with a theoretical
maximum transfer rate of 150 MB/s 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 Figure 20, page 64
1.7.3.3 Serial ATA RAID
The optional ICH6-R supports RAID (Redundant Array of Independent Drives) level 0 and RAID
level 1 on the Serial ATA ports as follows:
• RAID 0 supports data striping. Two physical drives, of identical size, 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.
• RAID 1 supports data mirroring. Two physical drives, of identical size, 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.
27
Intel Desktop Board D915GMH Technical Product Specification
1.7.3.4 RAID Boot Configuration Overview
A RAID array can be created by using the existing Serial ATA ports, correctly configuring the
BIOS, and installing drivers. The following steps are required to successfully establish a RAID
configuration.
1. Enable RAID Support in BIOS.
2. Create a RAID array using the Intel Application Accelerator (IAA) utility.
3. Install the IAA RAID driver.
4. Format the RAID array.
5. Install the IAA Companion Utility (this step is optional).
For information about Refer to
Serial ATA RAID configuration http://developer.intel.com/design/motherbd/mh/index.htm
1.7.4 Real-Time Clock, CMOS SRAM, and Battery
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer
is not plugged into a wall socket, the battery has an estimated life of three years. When the
computer is plugged in, the standby current from the power supply extends the life of the battery.
The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied.
✏ NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS
RAM at power-on.
1.8 PCI Express Connectors
The board provides the following PCI Express connectors:
• One PCI Express x16 connector supporting simultaneous transfer speeds up to 8 GBytes/sec
• One PCI Express x1 connector. The x1 interface supports simultaneous transfer speeds up to
500 MBytes/sec
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
28
Product Description
1.9 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.
1.9.1 Serial Port
Serial port A is located on the back panel. The serial port supports data transfers at speeds up to
115.2 kbits/sec with BIOS support.
For information about Refer to
The location of the serial port A connector Figure 19, page 62
1.9.2 Parallel Port
The 25-pin D-Sub parallel port connector is located on the back panel. Use the BIOS Setup
program to set the parallel port mode.
For information about Refer to
The location of the parallel port connector Figure 19, page 62
1.9.3 Diskette Drive Controller
The I/O controller supports one diskette drive. Use the BIOS Setup program to configure the
diskette drive interface.
For information about Refer to
The location of the diskette drive connector Figure 20, page 64
29
Intel Desktop Board D915GMH Technical Product Specification
1.9.4 Keyboard and Mouse Interface
PS/2 keyboard and mouse connectors are located on the back panel.
NOTE
✏
The keyboard is supported in the bottom PS/2 connector and the mouse is supported in the top PS/2
connector. Power to the computer should be turned off before a keyboard or mouse is connected or
disconnected.
For information about Refer to
The location of the keyboard and mouse connectors Figure 19, page 62
1.10 Audio Subsystem
The board supports the Intel High Definition audio subsystem based on the Realtek ALC880 or the
Realtek ALC860 audio codec. The audio subsystem supports the following features:
• Advanced jack sense (front and rear panel) that enables the audio codec to recognize the device
that is connected to an audio port. All 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 jacks
• Multi-streaming capabilities that enable different audio streams to be sent to different audio
devices. Multi-streaming also allows one audio stream to be directed out the back panel while
another audio stream can be directed out the front panel.
• A signal-to-noise (S/N) ratio of 90 dB
INTEGRATOR’S NOTE
#
For the front panel jack sensing and automatic retasking feature to function, a front panel daughter
card that is designed for Intel High Definition Audio must be used. Otherwise, an AC ’97 style
audio front panel connector will be assumed and the Line Out and Mic In functions will be
permanent.
30
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