chiliGREEN D915GAGL User Manual
Intel® Desktop Boards
D915GAV/D915GAG
Technical Product Specification
December 2004
Order Number: C68600-002
The Intel® Desktop Board D915GAV/D915GAG 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 D915GAV/D915GAG Specification Update.
Revision History
Revision Revision History Date
-001 First release of the Intel® Desktop Board D915GAV/D915GAG Technical
Product Specification.
-002 Second release of the Intel Desktop Board D915GAV/D915GAG Technical
Product Specification.
This product specification applies to only standard Intel Desktop Boards D915GAV and D915GAV
with BIOS identifier EV91510A.86A.
Changes to this specification will be published in the Intel Desktop Board D915GAV/D915GAG
Specification Update before being incorporated into a revision of this document.
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE,
EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED
BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL’S TERMS AND CONDITIONS OF SALE FOR SUCH
PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES
RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT,
COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. INTEL PRODUCTS ARE NOT INTENDED FOR USE IN
MEDICAL, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS.
June 2004
December 2004
Intel Corporation may have patents or pending patent applications, trademarks, copyrights, or other intellectual property
rights that relate to the presented subject matter. The furnishing of documents and other materials and information does not
provide any license, express or implied, by estoppel or otherwise, to any such patents, trademarks, copyrights, or other
intellectual property rights.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.”
Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising
from future changes to them.
®
Intel
desktop boards may contain design defects or errors known as errata, which may cause the product to deviate from
published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be
obtained from:
Intel Corporation
P.O. Box 5937
Denver, CO 80217-9808
or call in North America 1-800-548-4725, Europe 44-0-1793-431-155, France 44-0-1793-421-777,
Germany 44-0-1793-421-333, other Countries 708-296-9333.
Intel, Pentium, and Celeron are registered trademarks of Intel Corporation or its subsidiaries in the United States and other
countries.
* Other names and brands may be claimed as the property of others.
Preface
This Technical Product Specification (TPS) specifies the board layout, components, connectors,
®
power and environmental requirements, and the BIOS for these Intel
and D915GAG. It describes the standard product and available manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Desktop Boards
D915GAV and D915GAG 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
Desktop Boards: D915GAV
Chapter Description
1 A description of the hardware used on the Desktop Boards D915GAV and
D915GAG
2 A map of the resources of the Desktop Boards
3 The features supported by the BIOS Setup program
4 A description of the BIOS error messages, beep codes, and POST codes
Typographical Conventions
This section contains information about the conventions used in this specification. Not all of these
symbols and abbreviations appear in all specifications of this type.
Notes, Cautions, and Warnings
#
NOTE
Notes call attention to important information.
INTEGRATOR’S NOTES
Integrator’s notes are used to call attention to information that may be useful to system integrators.
CAUTION
Cautions are included to help you avoid damaging hardware or losing data.
iii
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
WARNING
Warnings indicate conditions, which if not observed, can cause personal injury.
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 Boards D915GAV and D915GAG, 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 Board Differences ........................................................................................................11
1.3 Overview ...................................................................................................................... 12
1.3.1 Feature Summary.......................................................................................... 12
1.3.2 Manufacturing Options ..................................................................................13
1.3.3 Board Layouts ...............................................................................................14
1.3.4 Block Diagram ............................................................................................... 18
1.4 Online Support ............................................................................................................. 19
1.5 Processor .....................................................................................................................19
1.6 System Memory ........................................................................................................... 20
1.6.1 Memory Configurations .................................................................................22
1.7 Intel® 915G Chipset .....................................................................................................26
1.7.1 Intel 915G Graphics Subsystem.................................................................... 26
1.7.2 USB ............................................................................................................... 28
1.7.3 IDE Support ...................................................................................................28
1.7.4 Real-Time Clock, CMOS SRAM, and Battery................................................ 30
1.8 PCI Express Connectors.............................................................................................. 30
1.9 I/O Controller................................................................................................................ 31
1.9.1 Serial Ports ....................................................................................................31
1.9.2 Parallel Port ...................................................................................................31
1.9.3 Diskette Drive Controller................................................................................ 32
1.9.4 Keyboard and Mouse Interface .....................................................................32
1.10 Audio Subsystem ......................................................................................................... 32
1.10.1 Audio Subsystem Software ...........................................................................33
1.10.2 Audio Connectors ..........................................................................................33
1.10.3 Intel® High Definition 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............................................................................................... 41
1.12.4 Chassis Intrusion and Detection.................................................................... 41
1.13 Power Management .....................................................................................................41
1.13.1 ACPI .............................................................................................................. 41
1.13.2 Hardware Support .........................................................................................44
1.14 Trusted Platform Module (Optional) .............................................................................48
1.14.1 System Requirements ................................................................................... 48
1.14.2 Warning of Potential Data Loss .....................................................................48
1.14.3 Security Precautions...................................................................................... 49
v
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
1.14.4 Trusted Platform Module Ownership ............................................................. 50
1.14.5 Enabling the Trusted Platform Module .......................................................... 51
1.14.6 Assuming Trusted Platform Module Ownership ............................................ 51
1.14.7 Recovery Procedures ....................................................................................52
1.14.8 Clearing Trusted Platform Module Ownership............................................... 53
1.14.9 Software Support........................................................................................... 54
2 Technical Reference
2.1 Introduction ..................................................................................................................55
2.2 Memory Resources ......................................................................................................55
2.2.1 Addressable Memory..................................................................................... 55
2.2.2 Memory Map.................................................................................................. 57
2.3 DMA Channels .............................................................................................................57
2.4 Fixed I/O Map............................................................................................................... 58
2.5 PCI Configuration Space Map...................................................................................... 59
2.6 Interrupts ......................................................................................................................60
2.7 PCI Conventional Interrupt Routing Map .....................................................................61
2.8 Connectors................................................................................................................... 63
2.8.1 Back Panel Connectors .................................................................................64
2.8.2 Component-side Connectors......................................................................... 66
2.9 Jumper Block ...............................................................................................................77
2.10 Mechanical Considerations .......................................................................................... 78
2.10.1 D915GAV Board Form Factor ....................................................................... 78
2.10.2 D915GAG Board Form Factor....................................................................... 79
2.10.3 I/O Shield....................................................................................................... 80
2.11 Electrical Considerations.............................................................................................. 81
2.11.1 DC Loading.................................................................................................... 81
2.11.2 Add-in Board Considerations......................................................................... 81
2.11.3 Fan Connector Current Capability .................................................................82
2.11.4 Power Supply Considerations .......................................................................82
2.12 Thermal Considerations ...............................................................................................83
2.13 Reliability...................................................................................................................... 85
2.14 Environmental .............................................................................................................. 86
2.15 Regulatory Compliance................................................................................................ 87
2.15.1 Safety Regulations ........................................................................................87
2.15.2 EMC Regulations........................................................................................... 87
2.15.3 European Union Declaration of Conformity Statement.................................. 88
2.15.4 Product Ecology Statements ......................................................................... 89
2.15.5 Product Certification Markings (Board Level) ................................................90
3 Overview of BIOS Features
3.1 Introduction ..................................................................................................................91
3.2 BIOS Flash Memory Organization ...............................................................................92
3.3 Resource Configuration ...............................................................................................92
3.3.1 PCI Autoconfiguration.................................................................................... 92
3.3.2 PCI IDE Support ............................................................................................92
3.4 System Management BIOS (SMBIOS) ........................................................................93
3.5 Legacy USB Support.................................................................................................... 93
vi
3.6 BIOS Updates .............................................................................................................. 94
3.6.1 Language Support .........................................................................................94
3.6.2 Custom Splash Screen.................................................................................. 94
3.7 Boot Options ................................................................................................................95
3.7.1 CD-ROM Boot ...............................................................................................95
3.7.2 Network Boot .................................................................................................95
3.7.3 Booting Without Attached Devices ................................................................ 95
3.7.4 Changing the Default Boot Device During POST .......................................... 95
3.8 Fast Booting Systems with Intel® Rapid BIOS Boot..................................................... 96
3.8.1 Peripheral Selection and Configuration .........................................................96
3.8.2 Intel Rapid BIOS Boot ...................................................................................96
3.9 BIOS Security Features ...............................................................................................97
4 Error Messages and Beep Codes
4.1 BIOS Error Messages .................................................................................................. 99
4.2 Port 80h POST Codes ...............................................................................................101
4.3 Bus Initialization Checkpoints ....................................................................................105
4.4 Speaker...................................................................................................................... 106
4.5 BIOS Beep Codes...................................................................................................... 106
Contents
Figures
1. D915GAV Board Components ..................................................................................... 14
2. D915GAG Board Components..................................................................................... 16
3. Block Diagram.............................................................................................................. 18
4. Memory Channel and DIMM Configuration.................................................................. 22
5. Dual Channel (Interleaved) Mode Configuration with Two DIMMs .............................. 23
6. Dual Channel (Interleaved) Mode Configuration with Three DIMMs............................ 23
7. Dual Channel (Interleaved) Mode Configuration with Four DIMMs.............................. 24
8. Single Channel (Asymmetric) Mode Configuration with One DIMM............................. 25
9. Single Channel (Asymmetric) Mode Configuration with Three DIMMs ........................ 25
10. Front/Back Panel Audio Connector Options for High Definition Audio Subsystem...... 34
11. High Definition Audio Subsystem Block Diagram ........................................................34
12. LAN Connector LED Locations .................................................................................... 36
13. LAN Connector LED Locations .................................................................................... 37
14. Thermal Monitoring for D915GAV Board ..................................................................... 39
15. Thermal Monitoring for D915GAG Board..................................................................... 40
16. Location of the Standby Power Indicator LED .............................................................47
17. Detailed System Memory Address Map....................................................................... 56
18. Back Panel Connectors................................................................................................ 64
19. D915GAV Board Component-side Connectors............................................................ 66
20. D915GAG Board Component-side Connectors ........................................................... 68
21. Connection Diagram for Front Panel Connector ..........................................................74
22. Connection Diagram for Front Panel USB Connectors................................................ 76
23. Connection Diagram for IEEE 1394a Connectors........................................................ 76
24. Location of the Jumper Block....................................................................................... 77
25. D915GAV Board Dimensions....................................................................................... 78
26. D915GAG Board Dimensions ...................................................................................... 79
vii
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
27. I/O Shield Dimensions.................................................................................................. 80
28. Processor Heatsink for Omni-directional Airflow.......................................................... 83
29. Localized High Temperature Zones .............................................................................84
Tables
1. Summary of Board Differences .................................................................................... 11
2. Feature Summary ........................................................................................................12
3. Manufacturing Options .................................................................................................13
4. D915GAV Board Components Shown in Figure 1 ....................................................... 15
5. D915GAG Board Components Shown in Figure 2....................................................... 17
6. Supported System Bus Frequency and Memory Speed Combinations ....................... 20
7. Supported Memory Configurations ..............................................................................21
8. LAN Connector LED States .........................................................................................36
9. LAN Connector LED States .........................................................................................37
10. Effects of Pressing the Power Switch ..........................................................................42
11. Power States and Targeted System Power ................................................................. 43
12. Wake-up Devices and Events ......................................................................................44
13. System Memory Map ................................................................................................... 57
14. DMA Channels .............................................................................................................57
15. I/O Map ........................................................................................................................58
16. PCI Configuration Space Map...................................................................................... 59
17. Interrupts ......................................................................................................................60
18. PCI Interrupt Routing Map ...........................................................................................62
19. Back Panel Connectors Shown in Figure 18................................................................ 65
20. Component-side Connectors Shown in Figure 19 .......................................................67
21. Component-side Connectors Shown in Figure 20 .......................................................69
22. S/PDIF Connector (Optional) ....................................................................................... 70
23. ATAPI CD-ROM Connector (Optional)......................................................................... 70
24. Front Panel Audio Connector....................................................................................... 70
25. Serial Port B Connector (optional) ...............................................................................70
26. Chassis Intrusion Connector ........................................................................................70
27. SCSI Hard Drive Activity LED Connector (Optional).................................................... 71
28. Serial ATA Connectors................................................................................................. 71
29. Processor Fan Connector ............................................................................................ 71
30. Chassis Fan Connectors.............................................................................................. 71
31. Main Power Connector................................................................................................. 72
32. ATX12V Power Connector ...........................................................................................73
33. Alternate Power Connector ..........................................................................................73
34. Auxiliary Front Panel Power/Sleep LED Connector .....................................................74
35. Front Panel Connector .................................................................................................74
36. States for a One-Color Power LED ..............................................................................75
37. States for a Two-Color Power LED ..............................................................................75
38. BIOS Setup Configuration Jumper Settings................................................................. 77
39. DC Loading Characteristics .........................................................................................81
40. Fan Connector Current Capability................................................................................ 82
41. Thermal Considerations for Components ....................................................................85
42. Environmental Specifications .......................................................................................86
viii
Contents
43. Safety Regulations .......................................................................................................87
44. EMC Regulations ......................................................................................................... 87
45. Product Certification Markings ..................................................................................... 90
46. BIOS Setup Program Menu Bar................................................................................... 92
47. BIOS Setup Program Function Keys............................................................................ 92
48. Boot Device Menu Options ..........................................................................................95
49. Supervisor and User Password Functions ...................................................................97
50. BIOS Error Messages .................................................................................................. 99
51. Uncompressed INIT Code Checkpoints..................................................................... 101
52. Boot Block Recovery Code Checkpoints ...................................................................101
53. Runtime Code Uncompressed in F000 Shadow RAM ............................................... 102
54. Bus Initialization Checkpoints ....................................................................................105
55. Upper Nibble High Byte Functions .............................................................................105
56. Lower Nibble High Byte Functions .............................................................................106
57. Beep Codes ...............................................................................................................106
ix
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
x
1 Product Description
What This Chapter Contains
1.1 PCI Bus Terminology Change...................................................................................... 11
1.2 Board Differences ........................................................................................................11
1.3 Overview ...................................................................................................................... 12
1.4 Online Support ............................................................................................................. 19
1.5 Processor .....................................................................................................................19
1.6 System Memory ........................................................................................................... 20
1.7 Intel® 915G Chipset .....................................................................................................26
1.8 PCI Express Connectors.............................................................................................. 30
1.9 I/O Controller................................................................................................................ 31
1.10 Audio Subsystem ......................................................................................................... 32
1.11 LAN Subsystem ...........................................................................................................35
1.12 Hardware Management Subsystem............................................................................. 38
1.13 Power Management .....................................................................................................41
1.14 Trusted Platform Module (Optional) .............................................................................48
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 Board Differences
This TPS describes these Intel Desktop Boards: D915GAV and D915GAG. The Desktop Boards
are identical with the exception of the items listed in Table 1.
Table 1. Summary of Board Differences
D915GAV D915GAG
Form factor ATX microATX
PCI Conventional Bus
add-in card connectors
PCI Express x1 bus addin card connectors
Chassis fan connectors Three: front chassis, rear chassis 1,
LAN configuration 10/100 Mbits/sec LAN subsystem
Four Two
Two One
Two: front chassis and rear chassis
and rear chassis 2
One of the following:
only
• Gigabit (10/100/1000 Mbits/sec)
LAN subsystem
• 10/100 Mbits/sec LAN subsystem
• No LAN subsystem
11
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
NOTE
Most of the illustrations in this document show only the Desktop Board D915GAV. When there are
significant differences between the two Desktop Boards, illustrations of both boards are provided.
1.3 Overview
1.3.1 Feature Summary
Table 2 summarizes the major features of the Desktop Boards D915GAV and D915GAG.
Table 2. Feature Summary
Form Factor
Processor Support for an Intel® Pentium® 4 processor in an LGA775 socket with an 800 or
Memory
Chipset
Video Intel® GMA900 onboard graphics subsystem
Audio Intel® High Definition Audio subsystem using the Realtek ALC860 audio codec
I/O Control LPC Bus I/O controller
USB Support for USB 2.0 devices
Peripheral
Interfaces
LAN Support
BIOS
• D915GAV: ATX (12.00 inches by 9.60 inches [304.80 millimeters by
243.84 millimeters])
• D915GAG: microATX Form Factor (9.60 inches by 9.60 inches [243.84
millimeters by 243.84 millimeters])
533 MHz system bus
• 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
• D915GAV: 10/100 Mbits/sec LAN subsystem using the Intel
• D915GAG: Refer to Table 3 on page 13 for a description of LAN subsystem
• Intel/AMI BIOS (resident in the 4 Mbit FWH)
• Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
82915G Graphics Memory Controller Hub (GMCH)
®
82801FB I/O Controller Hub (ICH6)
LAN Connect (PLC) device
options.
and SMBIOS
®
82562EZ Platform
continued
12
Table 2. Feature Summary (continued)
Expansion
Capabilities
Instantly Available
PC Technology
Hardware Monitor
Subsystem
• PCI Conventional bus connectors (four on the D915GAV; two on the D915GAG)
• PCI Express x1 bus add-in card connectors (two on the D915GAV; one on the
D915GAG)
• One PCI Express x16 bus add-in card connector (both boards)
• 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
• 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
Product Description
Table 3 describes the manufacturing options on the Desktop Boards D915GAV and D915GAG.
Not every manufacturing option is available in all marketing channels. Please contact your Intel
representative to determine which manufacturing options are available to you.
Table 3. Manufacturing Options
ATAPI CD-ROM
Connector
ATX fan
connector
IEEE-1394a
Interface
LAN subsystem The D915GAG board provides one of the following:
SCSI Hard Drive
Activity LED
Connector
Serial Port B Second serial port accessible via a connector on the component side of the board
S/PDIF Connector A 1 x 3 connector (mounted on the component side of the board) that provides digital
Trusted Platform
Module (TPM)
For information about Refer to
Available configurations for the Desktop Boards D915GAV and D915GAG Section 1.4, page 19
A connector for attaching an internal CD-ROM drive to the onboard audio subsystem
Additional fan connector for use in larger chassis (D915GAV board only)
IEEE-1394a controller and three IEEE-1394a connectors (one back panel connector,
two front-panel connectors)
• Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the Marvel* Yukon*
88E8050 PCI Express Gigabit Ethernet Controller
®
• 10/100 Mbits/sec LAN subsystem using the Intel
(PLC) device
• No LAN subsystem
Allows add-in hard drive controllers (SCSI or other) to use the same LED as the
onboard IDE controller.
audio signals in S/PDIF format
A component that enhances platform security
82562EZ Platform LAN Connect
13
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
1.3.3 Board Layouts
Figure 1 shows the location of the major components on the Desktop Board D915GAV.
MM
LL
KK
JJ
A B K L
II
D
F
G H I J
C
E
M
N
O
P
Q
R
S
T
HH
DDFF
Figure 1. D915GAV Board Components
Table 4 lists the components identified in Figure 1.
U
VWXYGG ZAAEEBBCC
OM16666
14
Table 4. D915GAV Board 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
Rear fan connector 2
Speaker
PCI Express x1 bus add-in card connectors
ATAPI CD-ROM connector (optional)
S/PDIF connector (optional)
Realtek ALC860 audio codec
Front panel audio connector
PCI Conventional bus add-in card connectors
Ethernet PLC device (optional)
PCI Express x16 bus add-in card connector
Rear chassis fan connector 1
Back panel connectors
Alternate power connector
+12V power connector (ATX12V)
LGA775 processor socket
Processor fan connector
Intel 82915G GMCH
DIMM Channel A sockets
Serial port B connector (optional)
DIMM Channel B sockets
SCSI LED (optional)
I/O controller
Power connector
Diskette drive connector
Parallel ATE IDE connector
Battery
Chassis intrusion connector
BIOS Setup configuration jumper block
4 Mbit Firmware Hub (FWH)
Front chassis fan connector
Serial ATA connectors
Auxiliary front panel power LED connector
Front panel connector
ATX fan connector (optional)
Front panel USB connector
Intel 82801FB I/O Controller Hub (ICH6)
Front panel IEEE-1394a connectors (optional)
IEEE-1394a controller (optional)
PCI Conventional bus add-in card connectors
Product Description
15
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
Figure 2 shows the location of the major components on the Desktop Board D915GAG.
KK
JJ
HH
GG
EFG H
I JA C
B D
K
L
M
II
N
O
P
Q
R
S
CCEE
Z
Figure 2. D915GAG Board Components
Table 5 lists the components identified in Figure 2.
T
UVWXFF YDDAABB
OM16656
16
Table 5. D915GAG Board Components Shown in Figure 2
Item/callout
from Figure 2 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
ATAPI CD-ROM connector (optional)
PCI Express x1 bus add-in card connectors
Realtek ALC860 audio codec
S/PDIF connector (optional)
Front panel audio connector
PCI Conventional bus add-in card connectors
Ethernet PLC device (optional)
PCI Express x16 bus add-in card connector
Rear chassis fan connector
Back panel connectors
Alternate power connector
+12V power connector (ATX12V)
LGA775 processor socket
Hardware monitoring and fan control ASIC
Processor fan connector
Intel 82915G GMCH
DIMM Channel A sockets
Serial port B connector (optional)
DIMM Channel B sockets
SCSI LED connector (optional)
I/O controller
Power connector
Diskette drive connector
Parallel ATE IDE connector
Battery
Chassis intrusion connector
BIOS Setup configuration jumper block
4 Mbit Firmware Hub (FWH)
Front chassis fan connector
Serial ATA connectors
Auxiliary front panel power LED connector
Front panel connector
Front panel USB connector
Intel 82801FB I/O Controller Hub (ICH6)
Front panel IEEE-1394a connectors (optional)
IEEE-1394a controller (optional)
Speaker
Product Description
17
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
1.3.4 Block Diagram
Figure 3 is a block diagram of the major functional areas of the boards.
PCI Express x1 Interface
Controller (Optional)
Gigabit Ethernet
D915GAG only
LAN
Connector
PCI Express x1 Slot 1
PCI Express x1 Slot 2
Parallel ATA
IDE Connector
LGA775
Processor Socket
PCI Express
x16 Interface
PCI Express
x16
Connector
VGA
Port
Channel A
DIMMs (2)
Channel B
DIMMs (2)
Display Interface
D915GAV
only
Parallel ATA
IDE Interface
System Bus
(800/533 MHz)
Intel 82915G
Graphics and
Memory Controller
Hub (GMCH)
Dual-Channel
Memory Bus
SMBus
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
Connector
4 Mbit
Firmware Hub
(FWH)
Intel 915G Chipset
LPC Bus
TPM Component
(Optional)
Interface
LAN Connect
10/100
LAN PLC
(Optional)
LAN
Connector
18
IEEE-1394a Connectors
(Optional)
PCI Slot 1
PCI Slot 2
PCI Slot 3
PCI Slot 4
= connector or socket
PCI Bus
D915GAV
only
PCI Bus
SMBus
Hardware Monitoring
and Fan Control ASIC
Figure 3. Block Diagram
Serial ATA
IDE Interface
High Definition Audio Link
Mic In/Retasking Jack B
Line In/Retasking Jack C
Audio
Codec
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)
OM17551
1.4 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Boards D915GAV and
D915GAG under “Desktop Board
Products” or “Desktop Board Support”
Available configurations for the Desktop
Board D915GAV
Available configurations for the Desktop
Board D915GAG
Processor data sheets http://www.intel.com/design/litcentr
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
1.5 Processor
Product Description
http://www.intel.com/design/motherbd
http://support.intel.com/support/motherboards/desktop
http://developer.intel.com/design/motherbd/av/av_available.htm
http://developer.intel.com/design/motherbd/ag/ag_available.htm
The boards are 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 D915GAV board http://www.intel.com/design/motherbd/av/av_proc.htm
Supported processors for the D915GAG board http://www.intel.com/design/motherbd/ag/ag_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
#
• Use only ATX12V-compliant power supplies.
• Refer to Table 6 on page 20 for a list of supported system bus frequency and memory speed
combinations.
For information about Refer to
Power supply connectors Section 2.8.2.2, page 72
19
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
1.6 System Memory
The boards have 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 55 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 6 lists the supported system bus frequency and memory speed combinations.
Table 6. 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.
20
Product Description
Table 7 lists the supported DIMM configurations.
Table 7. 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 55 for additional
information on available memory.
21
Intel Desktop Board D915GAV/D915GAG 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 4 illustrates the memory channel and DIMM configuration.
NOTE
The DIMM0 sockets of both channels are blue. The DIMM1 sockets of both channels are black.
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
22
OM16667
Figure 4. Memory Channel and DIMM Configuration
1.6.1.1 Dual Channel (Interleaved) Mode Configurations
Figure 5 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 5. Dual Channel (Interleaved) Mode Configuration with Two DIMMs
Figure 6 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 6. Dual Channel (Interleaved) Mode Configuration with Three DIMMs
23
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
Figure 7 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 7. Dual Channel (Interleaved) Mode Configuration with Four DIMMs
24
1.6.1.2 Single Channel (Asymmetric) Mode Configurations
Product Description
NOTE
Dual channel (Interleaved) mode configurations provide the highest memory throughput.
Figure 8 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 8. 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 9 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
Figure 9. Single Channel (Asymmetric) Mode Configuration with Three DIMMs
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17126
25
Intel Desktop Board D915GAV/D915GAG 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 GMCH 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) 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
26
Product Description
• Video
⎯ Asynchronous dual monitor display with ADD2 card
⎯ Hardware motion compensation for software MPEG2 decode
⎯ Two multiplexed DVO port interfaces with 200 MHz pixel clocks using an ADD2 card
• Dynamic Video Memory Technology (DVMT) support up to 224 MB
• Intel
For information about Refer to
DVMT Section 1.7.1.2, page 27
Obtaining graphics software and utilities Section 1.4, page 19
®
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) 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 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 card. An ADD2 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 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
27
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
1.7.1.4 Configuration Modes
A list of supported modes for the Intel GMA900 graphics controller is available as a downloadable
document.
For information about Refer to
Supported modes for the D915GAV board http://www.intel.com/design/motherbd/av/av_prdoc.htm
Supported modes for the D915GAG board http://www.intel.com/design/motherbd/ag/ag_prdoc.htm
1.7.2 USB
The boards support 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 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 18, page 64
The location of the front panel USB connectors on the D915GAV board Figure 19, page 66
The location of the front panel USB connectors on the D915GAG board Figure 20, page 68
1.7.3 IDE Support
The boards 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.
28
Product Description
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.
The boards support 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 on the D915GAV board Figure 19, page 66
The location of the Parallel ATA IDE connector on the D915GAG board Figure 20, page 68
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 on the D915GAV board Figure 19, page 66
The location of the Serial ATA IDE connectors on the D915GAG board Figure 20, page 68
29
Intel Desktop Board D915GAV/D915GAG Technical Product Specification
1.7.3.3 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 on the D915GAV board Figure 19, page 66
The location of the SCSI hard drive activity LED connector on the D915GAG board Figure 20, page 68
The signal names of the SCSI hard drive activity LED connector Table 27, page 71
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 boards provide the following PCI Express connectors:
• One PCI Express x16 connector supporting simultaneous transfer speeds up to 8 GBytes/sec
• Two PCI Express x1 connectors. The x1 interfaces support 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 include 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
30
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