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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 PCI Express x1 Slot 1 PCI Express x1 Slot 2 D915GAV only Parallel ATA IDE Connector Parallel ATA IDE Interface LGA775 Processor Socket System Bus (800/533 MHz) PCI Express x16 Interface PCI Express x16 Connector Intel 82915G Graphics and Memory Controller Hub (GMCH) VGA Port Channel A DIMMs (2) Display Interface Dual-Channel Memory Bus SMBus Channel B DIMMs (2) Gigabit Ethernet Controller (Optional) D915GAG only LAN Connector USB Back Panel/Front Panel USB Ports LPC Bus I/O Controller LPC Bus Serial Ports Parallel Port PS/2 Mouse PS/2 Keyboard Diskette Drive Connector Intel 82801FB I/O Controller Hub (ICH6) 4 Mbit Firmware Hub (FWH) Intel 915G Chipset TPM Component (Optional) 10/100 LAN PLC (Optional) LAN Connector DMI Interconnect High Definition Audio Link LAN Connect Interface LPC Bus IEEE-1394a Connectors (Optional) PCI Bus PCI Bus PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Slot 4 D915GAV only SMBus Hardware Monitoring and Fan Control ASIC Serial ATA IDE Interface Serial ATA IDE Connectors (4) Audio Codec Mic In/Retasking Jack B Line In/Retasking Jack C Line Out/Retasking Jack D Retasking Jack E [Port 1] Retasking Jack F [Port 2] CD-ROM (optional) S/PDIF (optional) = connector or socket Figure 3. Block Diagram OM17551 18

Section	Page
Intel® Desktop Boards D915GAV/D915GAG Technical Product Specification	1
Revision History	2
Preface	3
Intended Audience	3
What This Document Contains	3
Typographical Conventions	3
Other Common Notations	4
Contents	5
1 Product Description	11
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
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	55
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	91
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
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	99
4.1 BIOS Error Messages	99
4.2 Port 80h POST Codes	101
4.3 Bus Initialization Checkpoints	105
4.4 Speaker	106

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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

D915GAV

only

Intel 915G Chipset

Intel 82801FB

I/O Controller Hub

(ICH6)

Intel 82915G

Graphics and

Memory Controller

Hub (GMCH)

4 Mbit

Firmware Hub

(FWH)

System Bus

(800/533 MHz)

LGA775

Processor Socket

Parallel ATA

IDE Connector

Diskette Drive

Connector

LPC Bus

I/O

Controller

PS/2 Keyboard

PS/2 Mouse

Parallel Port

Serial Ports

Parallel ATA

IDE Interface

LPC Bus

Hardware Monitoring

and Fan Control ASIC

OM17551

Audio

Codec

Retasking Jack F [Port 2]

Line Out/Retasking Jack D

CD-ROM (optional)

Retasking Jack E [Port 1]

LAN

Connector

10/100

LAN PLC

(Optional)

PCI Express

x16 Interface

PCI Express

x16

Connector

= connector or socket

PCI Bus

SMBus

High Definition Audio Link

USB

Dual-Channel

Memory Bus

SMBus

PCI Slot 1

PCI Slot 2

PCI Slot 3

PCI Slot 4

Mic In/Retasking Jack B

Line In/Retasking Jack C

S/PDIF (optional)

Serial ATA IDE

Connectors (4)

Serial ATA

IDE Interface

VGA

Port

Display Interface

Channel A

DIMMs (2)

Channel B

DIMMs (2)

Back Panel/Front Panel

USB Ports

DMI Interconnect

PCI Bus

TPM Component

(Optional)

LPC Bus

IEEE-1394a Connectors

(Optional)

LAN Connect

Interface

D915GAV

only

PCI Express x1 Slot 1

PCI Express x1 Slot 2

PCI Express x1 Interface

LAN

Connector

Gigabit Ethernet

Controller (Optional)

Figure 3.

Block Diagram