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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 -001 -002 Revision History First release of the Product Specification. Intel® Desktop Board D915GAV/D915GAG Technical Date June 2004 December 2004

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. 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® Desktop Boards: D915GAV 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
Chapter 1 2 3 4 Description A description of the hardware used on the Desktop Boards D915GAV and D915GAG A map of the resources of the Desktop Boards The features supported by the BIOS Setup program 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
# (NxnX) Used after a signal name to identify an active-low signal (such as USBP0#) 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. Gigabyte (1,073,741,824 bytes) Gigabytes per second Kilobyte (1024 bytes) Kilobit (1024 bits) 1000 bits per second Megabyte (1,048,576 bytes) Megabytes per second Megabit (1,048,576 bits) Megabits per second An address or data value ending with a lowercase h indicates a hexadecimal value. 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.

GB GB/sec KB Kbit kbits/sec MB MB/sec Mbit Mbit/sec xxh x.x V *

iv

Contents
1 Product Description
1.1 1.2 1.3 PCI Bus Terminology Change...................................................................................... 11 Board Differences ........................................................................................................ 11 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 Online Support ............................................................................................................. 19 Processor ..................................................................................................................... 19 System Memory ........................................................................................................... 20 1.6.1 Memory Configurations ................................................................................. 22 ® 915G Chipset ..................................................................................................... 26 Intel 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 PCI Express Connectors.............................................................................................. 30 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 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 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 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 Power Management ..................................................................................................... 41 1.13.1 ACPI .............................................................................................................. 41 1.13.2 Hardware Support ......................................................................................... 44 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

1.4 1.5 1.6 1.7

1.8 1.9

1.10

1.11

1.12

1.13

1.14

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Intel Desktop Board D915GAV/D915GAG Technical Product Specification

1.14.4 1.14.5 1.14.6 1.14.7 1.14.8 1.14.9 2.1 2.2

Trusted Platform Module Ownership ............................................................. 50 Enabling the Trusted Platform Module .......................................................... 51 Assuming Trusted Platform Module Ownership ............................................ 51 Recovery Procedures .................................................................................... 52 Clearing Trusted Platform Module Ownership............................................... 53 Software Support........................................................................................... 54

2 Technical Reference
Introduction .................................................................................................................. 55 Memory Resources ...................................................................................................... 55 2.2.1 Addressable Memory..................................................................................... 55 2.2.2 Memory Map.................................................................................................. 57 DMA Channels ............................................................................................................. 57 Fixed I/O Map............................................................................................................... 58 PCI Configuration Space Map...................................................................................... 59 Interrupts ...................................................................................................................... 60 PCI Conventional Interrupt Routing Map ..................................................................... 61 Connectors................................................................................................................... 63 2.8.1 Back Panel Connectors ................................................................................. 64 2.8.2 Component-side Connectors......................................................................... 66 Jumper Block ............................................................................................................... 77 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 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 Thermal Considerations ............................................................................................... 83 Reliability...................................................................................................................... 85 Environmental .............................................................................................................. 86 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 Introduction .................................................................................................................. 91 BIOS Flash Memory Organization ............................................................................... 92 Resource Configuration ............................................................................................... 92 3.3.1 PCI Autoconfiguration.................................................................................... 92 3.3.2 PCI IDE Support ............................................................................................ 92 System Management BIOS (SMBIOS) ........................................................................ 93 Legacy USB Support.................................................................................................... 93

2.3 2.4 2.5 2.6 2.7 2.8

2.9 2.10

2.11

2.12 2.13 2.14 2.15

3 Overview of BIOS Features
3.1 3.2 3.3

3.4 3.5

vi

Contents

3.6

3.7

3.8

3.9 4.1 4.2 4.3 4.4 4.5

BIOS Updates .............................................................................................................. 94 3.6.1 Language Support ......................................................................................... 94 3.6.2 Custom Splash Screen.................................................................................. 94 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 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 BIOS Security Features ............................................................................................... 97 BIOS Error Messages .................................................................................................. 99 Port 80h POST Codes ............................................................................................... 101 Bus Initialization Checkpoints .................................................................................... 105 Speaker...................................................................................................................... 106 BIOS Beep Codes...................................................................................................... 106

4 Error Messages and Beep Codes

Figures
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. D915GAV Board Components ..................................................................................... 14 D915GAG Board Components..................................................................................... 16 Block Diagram.............................................................................................................. 18 Memory Channel and DIMM Configuration.................................................................. 22 Dual Channel (Interleaved) Mode Configuration with Two DIMMs .............................. 23 Dual Channel (Interleaved) Mode Configuration with Three DIMMs............................ 23 Dual Channel (Interleaved) Mode Configuration with Four DIMMs.............................. 24 Single Channel (Asymmetric) Mode Configuration with One DIMM............................. 25 Single Channel (Asymmetric) Mode Configuration with Three DIMMs ........................ 25 Front/Back Panel Audio Connector Options for High Definition Audio Subsystem...... 34 High Definition Audio Subsystem Block Diagram ........................................................ 34 LAN Connector LED Locations .................................................................................... 36 LAN Connector LED Locations .................................................................................... 37 Thermal Monitoring for D915GAV Board ..................................................................... 39 Thermal Monitoring for D915GAG Board..................................................................... 40 Location of the Standby Power Indicator LED ............................................................. 47 Detailed System Memory Address Map....................................................................... 56 Back Panel Connectors................................................................................................ 64 D915GAV Board Component-side Connectors............................................................ 66 D915GAG Board Component-side Connectors ........................................................... 68 Connection Diagram for Front Panel Connector .......................................................... 74 Connection Diagram for Front Panel USB Connectors................................................ 76 Connection Diagram for IEEE 1394a Connectors........................................................ 76 Location of the Jumper Block....................................................................................... 77 D915GAV Board Dimensions....................................................................................... 78 D915GAG Board Dimensions ...................................................................................... 79

vii

Intel Desktop Board D915GAV/D915GAG Technical Product Specification

27. 28. 29.

I/O Shield Dimensions.................................................................................................. 80 Processor Heatsink for Omni-directional Airflow.......................................................... 83 Localized High Temperature Zones ............................................................................. 84

Tables
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. Summary of Board Differences .................................................................................... 11 Feature Summary ........................................................................................................ 12 Manufacturing Options ................................................................................................. 13 D915GAV Board Components Shown in Figure 1 ....................................................... 15 D915GAG Board Components Shown in Figure 2....................................................... 17 Supported System Bus Frequency and Memory Speed Combinations ....................... 20 Supported Memory Configurations .............................................................................. 21 LAN Connector LED States ......................................................................................... 36 LAN Connector LED States ......................................................................................... 37 Effects of Pressing the Power Switch .......................................................................... 42 Power States and Targeted System Power ................................................................. 43 Wake-up Devices and Events ...................................................................................... 44 System Memory Map ................................................................................................... 57 DMA Channels ............................................................................................................. 57 I/O Map ........................................................................................................................ 58 PCI Configuration Space Map...................................................................................... 59 Interrupts ...................................................................................................................... 60 PCI Interrupt Routing Map ........................................................................................... 62 Back Panel Connectors Shown in Figure 18................................................................ 65 Component-side Connectors Shown in Figure 19 ....................................................... 67 Component-side Connectors Shown in Figure 20 ....................................................... 69 S/PDIF Connector (Optional) ....................................................................................... 70 ATAPI CD-ROM Connector (Optional)......................................................................... 70 Front Panel Audio Connector....................................................................................... 70 Serial Port B Connector (optional) ............................................................................... 70 Chassis Intrusion Connector ........................................................................................ 70 SCSI Hard Drive Activity LED Connector (Optional).................................................... 71 Serial ATA Connectors................................................................................................. 71 Processor Fan Connector ............................................................................................ 71 Chassis Fan Connectors.............................................................................................. 71 Main Power Connector................................................................................................. 72 ATX12V Power Connector ........................................................................................... 73 Alternate Power Connector .......................................................................................... 73 Auxiliary Front Panel Power/Sleep LED Connector ..................................................... 74 Front Panel Connector ................................................................................................. 74 States for a One-Color Power LED .............................................................................. 75 States for a Two-Color Power LED .............................................................................. 75 BIOS Setup Configuration Jumper Settings................................................................. 77 DC Loading Characteristics ......................................................................................... 81 Fan Connector Current Capability................................................................................ 82 Thermal Considerations for Components .................................................................... 85 Environmental Specifications ....................................................................................... 86

viii

Contents

43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57.

Safety Regulations ....................................................................................................... 87 EMC Regulations ......................................................................................................... 87 Product Certification Markings ..................................................................................... 90 BIOS Setup Program Menu Bar................................................................................... 92 BIOS Setup Program Function Keys............................................................................ 92 Boot Device Menu Options .......................................................................................... 95 Supervisor and User Password Functions ................................................................... 97 BIOS Error Messages .................................................................................................. 99 Uncompressed INIT Code Checkpoints..................................................................... 101 Boot Block Recovery Code Checkpoints ................................................................... 101 Runtime Code Uncompressed in F000 Shadow RAM ............................................... 102 Bus Initialization Checkpoints .................................................................................... 105 Upper Nibble High Byte Functions ............................................................................. 105 Lower Nibble High Byte Functions ............................................................................. 106 Beep Codes ............................................................................................................... 106

ix

Intel Desktop Board D915GAV/D915GAG Technical Product Specification

x

1 Product Description
What This Chapter Contains
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 PCI Bus Terminology Change...................................................................................... 11 Board Differences ........................................................................................................ 11 Overview ...................................................................................................................... 12 Online Support ............................................................................................................. 19 Processor ..................................................................................................................... 19 System Memory ........................................................................................................... 20 Intel® 915G Chipset ..................................................................................................... 26 PCI Express Connectors.............................................................................................. 30 I/O Controller................................................................................................................ 31 Audio Subsystem ......................................................................................................... 32 LAN Subsystem ........................................................................................................... 35 Hardware Management Subsystem............................................................................. 38 Power Management ..................................................................................................... 41 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.
Form factor PCI Conventional Bus add-in card connectors PCI Express x1 bus addin card connectors Chassis fan connectors LAN configuration

Summary of Board Differences
D915GAV ATX Four Two Three: front chassis, rear chassis 1, and rear chassis 2 10/100 Mbits/sec LAN subsystem only D915GAG microATX Two One Two: front chassis and rear chassis One of the following: · 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
Feature Summary
· 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]) Processor Memory Support for an Intel® Pentium® 4 processor in an LGA775 socket with an 800 or 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 Chipset Intel® 915G Chipset, consisting of: · Intel® 82915G Graphics Memory Controller Hub (GMCH) · Intel® 82801FB I/O Controller Hub (ICH6) · 4 Mbit Firmware Hub (FWH) Video Audio I/O Control USB Peripheral Interfaces Intel® GMA900 onboard graphics subsystem Intel® High Definition Audio subsystem using the Realtek ALC860 audio codec LPC Bus I/O controller Support for USB 2.0 devices · 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 LAN Support · D915GAV: 10/100 Mbits/sec LAN subsystem using the Intel® 82562EZ Platform LAN Connect (PLC) device · D915GAG: Refer to Table 3 on page 13 for a description of LAN subsystem options. BIOS · Intel/AMI BIOS (resident in the 4 Mbit FWH) · Support for Advanced Configuration and Power Interface (ACPI), Plug and Play, and SMBIOS continued

Table 2 summarizes the major features of the Desktop Boards D915GAV and D915GAG.
Table 2.

Form Factor

12

Product Description

Table 2.

Feature Summary (continued)
· 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

Expansion Capabilities

Instantly Available PC Technology

Hardware Monitor Subsystem

· Hardware monitoring and fan control ASIC · Voltage sense to detect out of range power supply voltages · Thermal sense to detect out of range thermal values · Three fan connectors · Three fan sense inputs used to monitor fan activity · Fan speed control

1.3.2

Manufacturing Options

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
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) The D915GAG board provides one of the following: · 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® 82562EZ Platform LAN Connect (PLC) device · No LAN subsystem SCSI Hard Drive Activity LED Connector Serial Port B S/PDIF Connector Trusted Platform Module (TPM) Allows add-in hard drive controllers (SCSI or other) to use the same LED as the onboard IDE controller. Second serial port accessible via a connector on the component side of the board A 1 x 3 connector (mounted on the component side of the board) that provides digital audio signals in S/PDIF format A component that enhances platform security

ATAPI CD-ROM Connector ATX fan connector IEEE-1394a Interface LAN subsystem

For information about Available configurations for the Desktop Boards D915GAV and D915GAG

Refer to Section 1.4, page 19

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.
A D F G B C E H I J K L

M N

O

MM LL KK JJ

P Q R

II

S T U

HH

FF GG EE

DD BB CC AA Z Y X W V
OM16666

Figure 1. D915GAV Board Components

Table 4 lists the components identified in Figure 1.

14

Product Description

Table 4.

D915GAV Board Components Shown in Figure 1
Description 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

Item/callout from Figure 1 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

15

Intel Desktop Board D915GAV/D915GAG Technical Product Specification

Figure 2 shows the location of the major components on the Desktop Board D915GAG.
A C E B D FG H I J

K L

KK M

JJ II HH

N O P Q R S T

GG

EE FF DD

CC AA BB Z Y X W V U
OM16656

Figure 2. D915GAG Board Components

Table 5 lists the components identified in Figure 2.

16

Product Description

Table 5.

D915GAG Board Components Shown in Figure 2
Description 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

Item/callout from Figure 2 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

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.
D915GAG only PCI Express x1 Interface PCI Express x1 Slot 1 PCI Express x1 Slot 2 D915GAV only USB Gigabit Ethernet Controller (Optional) LAN Connector

Back Panel/Front Panel USB Ports Serial Ports

Parallel ATA IDE Connector

Parallel ATA IDE Interface

LPC Bus I/O Controller

Parallel Port PS/2 Mouse PS/2 Keyboard

LGA775 Processor Socket

System Bus (800/533 MHz) LPC Bus DMI Interconnect

Diskette Drive Connector

PCI Express x16 Interface PCI Express x16 Connector VGA Port

Intel 82915G Graphics and Memory Controller Hub (GMCH)

Intel 82801FB I/O Controller Hub (ICH6) LPC Bus

4 Mbit Firmware Hub (FWH)

Intel 915G Chipset
TPM Component (Optional)

High Definition Audio Link

Channel A DIMMs (2) Channel B DIMMs (2)

Dual-Channel Memory Bus SMBus

LAN Connect Interface

Display Interface

10/100 LAN PLC (Optional)

LAN Connector

IEEE-1394a Connectors (Optional) PCI Bus PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Slot 4 D915GAV only

PCI Bus

Serial ATA IDE Interface

Serial ATA IDE Connectors (4)

Mic In/Retasking Jack B Line In/Retasking Jack C SMBus Audio Codec Line Out/Retasking Jack D Retasking Jack E [Port 1] Retasking Jack F [Port 2] CD-ROM (optional) S/PDIF (optional)

Hardware Monitoring and Fan Control ASIC

= connector or socket
OM17551

Figure 3. Block Diagram

18

Product Description

1.4 Online Support
To find information about... 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 ICH6 addressing Custom splash screens Audio software and utilities LAN software and drivers Visit this World Wide Web site: 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 http://www.intel.com/design/litcentr http://developer.intel.com/design/chipsets/datashts http://intel.com/design/motherbd/gen_indx.htm http://www.intel.com/design/motherbd http://www.intel.com/design/motherbd

1.5 Processor
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... Supported processors for the D915GAV board Supported processors for the D915GAG board Refer to: http://www.intel.com/design/motherbd/av/av_proc.htm 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.
Refer to Section 2.8.2.2, page 72

For information about Power supply connectors

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.
DDR 400 DDR 333 (Note)
Note:

Supported System Bus Frequency and Memory Speed Combinations
The processor's system bus frequency must be... 800 MHz 800 or 533 MHz

To use this type of DIMM...

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.
DIMM Capacity 128 MB 256 MB 256 MB 512 MB 512 MB 512 MB 1024 MB 1024 MB 2048 MB

Supported Memory Configurations
Configuration SS SS SS DS SS SS DS SS DS SDRAM Density 256 Mbit 256 Mbit 512 Mbit 256 Mbit 512 Mbit 1 Gbit 512 Mbit 1 Gbit 1 Gbit SDRAM Organization Front-side/Back-side 16 M x 16/empty 32 M x 8/empty 32 M x 16/empty 32 M x 8/32 M x 8 64 M x 8/empty 64 M x 16/empty 64 M x 8/64 M x 8 128 M x 8/empty 128 M x 8/128 M x 8 Number of SDRAM Devices 4 8 4 16 8 4 16 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).

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

OM16667

Figure 4. Memory Channel and DIMM Configuration

22

Product Description

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.

1 GB

Channel A, DIMM 0 Channel A, DIMM 1 Channel B, DIMM 0 Channel B, DIMM 1

1 GB

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 512 MB

Channel A, DIMM 0 Channel A, DIMM 1 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

Product Description

1.6.1.2

Single Channel (Asymmetric) Mode Configurations 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

Channel A, DIMM 0 Channel A, DIMM 1 Channel B, DIMM 0 Channel B, DIMM 1

OM17125

Figure 8. Single Channel (Asymmetric) Mode Configuration with One DIMM

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

Channel A, DIMM 0 Channel A, DIMM 1 Channel B, DIMM 0 Channel B, DIMM 1

OM17126

Figure 9. Single Channel (Asymmetric) Mode Configuration with Three DIMMs

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 The Intel 915G chipset Resources used by the chipset Refer to http://developer.intel.com/ 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® Zoom Utility
Refer to Section 1.7.1.2, page 27 Section 1.4, page 19

For information about DVMT Obtaining graphics software and utilities

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 Supported modes for the D915GAV board Supported modes for the D915GAG board Refer to http://www.intel.com/design/motherbd/av/av_prdoc.htm 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 The location of the USB connectors on the back panel The location of the front panel USB connectors on the D915GAV board The location of the front panel USB connectors on the D915GAG board Refer to Figure 18, page 64 Figure 19, page 66 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 The location of the Parallel ATA IDE connector on the D915GAV board The location of the Parallel ATA IDE connector on the D915GAG board Refer to Figure 19, page 66 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 The location of the Serial ATA IDE connectors on the D915GAV board The location of the Serial ATA IDE connectors on the D915GAG board Refer to Figure 19, page 66 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 The location of the SCSI hard drive activity LED connector on the D915GAV board The location of the SCSI hard drive activity LED connector on the D915GAG board The signal names of the SCSI hard drive activity LED connector Refer to Figure 19, page 66 Figure 20, page 68 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

Product Description

1.9 I/O Controller
The I/O controller provides the following features: · Two serial ports (Serial Port B is optional) · 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 Ports

The Desktop Board can support up to two serial port connectors. Serial port A is located on the back panel. Serial port B (optional) is accessible using a connector on the component side of board. The serial ports support data transfers at speeds up to 115.2 kbits/sec with BIOS support.
For information about The location of the serial port A connector The location of the serial port B connector on the D915GAV board The location of the serial port B connector on the D915GAG board The signal names of the serial port B connector Refer to Figure 18, page 64 Figure 19, page 66 Figure 20, page 68 Table 25, page 70

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 The location of the parallel port connector Refer to Figure 18, page 64

31

Intel Desktop Board D915GAV/D915GAG Technical Product Specification

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 The location of the diskette drive connector on the D915GAV board The location of the diskette drive connector on the D915GAG board Refer to Figure 19, page 66 Figure 20, page 68

1.9.4

Keyboard and Mouse Interface
NOTE

PS/2 keyboard and mouse connectors are located on the back panel.

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 The location of the keyboard and mouse connectors Refer to Figure 18, page 64

1.10 Audio Subsystem
The boards support the Intel High Definition audio subsystem based on the Realtek ALC860 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 · 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.

32

Product Description

1.10.1

Audio Subsystem Software
Refer to Section 1.4, page 19

Audio software and drivers are available from Intel's World Wide Web site.
For information about Obtaining audio software and drivers

1.10.2

Audio Connectors

The boards contain audio connector on both the back panel and the component side of the board. The component-side audio connectors include the following: · Front panel audio (a 2 x 5-pin connector that provides mic in and line out signals for front panel audio connectors) · ATAPI CD-ROM (an optional 1 x 4-pin ATAPI-style connector for connecting an internal ATAPI CD-ROM drive to the audio mixer) · S/PDIF (an optional 1 x 3 connector that provides S/PDIF output signals) The functions of the back panel audio connectors are dependent on which subsystem is present.
For information about The location of the front panel audio connector, the optional ATAPI CD-ROM connector, and the optional S/PDIF connector on the D915GAV board The location of the front panel audio connector, the optional ATAPI CD-ROM connector, and the optional S/PDIF connector on the D915GAG board The signal names of the front panel audio connector The signal names of the optional ATAPI CD-ROM connector The signal names of the optional S/PDIF connector Refer to Figure 19, page 66 Figure 20, page 68 Table 24, page 70 Table 23, page 70 Table 22, page 70

33

Intel Desktop Board D915GAV/D915GAG Technical Product Specification

1.10.3

Intel® High Definition Audio Subsystem

The Intel High Definition Audio subsystem includes the following: · Intel 82801FB I/O Controller Hub (ICH6) · Realtek ALC860 audio codec · Microphone input that supports a single dynamic, condenser, or electret microphone The front and back audio connectors are configurable through the audio device drivers. The available configurable audio ports are shown in Figure 10.
Front Panel Audio Connectors Back Panel Audio Connectors

Line Out/ Retasking Jack F [Port 2]

Mic In/ Retasking Jack E [Port 1]

Line In/ Retasking Jack C Line Out/ Retasking Jack D Mic In/ Retasking Jack B

OM16989

Figure 10. Front/Back Panel Audio Connector Options for High Definition Audio Subsystem

Figure 11 is a block diagram of the High Definition audio subsystem.
Mic In/Retasking Jack B Line In/Retasking Jack C 82801FB I/O Controller Hub (ICH6) Intel High Definition Audio Link ALC860 Audio Codec Line Out/Retasking Jack D Front Panel Mic In/Retasking Jack E [Port 1] Front Panel Line Out/Retasking Jack F [Port 2] CD-ROM (optional) S/PDIF (optional)

OM16990

Figure 11. High Definition Audio Subsystem Block Diagram
For information about The back panel audio connectors Refer to Figure 18, page 64

34

Product Description

1.11 LAN Subsystem
NOTE
The D915GAV board provides a 10/100 Mbits/sec LAN