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Intel Desktop Board D945GCL Technical Product Specification 1.1.3 Block Diagram Figure 2 is a block diagram of the major functional areas. PCI Express x1 Interface PCI Express x1 Slot 1 Parallel ATA IDE Connector Parallel ATA IDE Interface LGA775 Processor Socket System Bus (1066/800/533 MHz) PCI Express x16 Interface PCI Express x16 Connector Intel 945G Chipset Intel 82945G Graphics and Memory Controller Hub (GMCH) USB Back Panel/Front Panel USB Ports Legacy I/O Controller LPC Bus Serial Port Parallel Port PS/2 Mouse PS/2 Keyboard Diskette Drive Connector Intel 82801GB I/O Controller Hub (ICH7) Serial Peripheral Interface (SPI) Flash Device DMI Interconnect High Definition Audio Link LAN Connect Interface VGA Port Display Interface Channel A DIMM Dual-Channel Memory Bus SMBus Channel B DIMM 10/100 LAN PLC LAN Connector Serial ATA IDE Interface Serial ATA IDE Connectors (4) PCI Slot 1 PCI Slot 2 PCI Bus SMBus Hardware Monitoring and Fan Control ASIC Audio Codec Line Out Mic In Line In/Retasking Jack Line Out/Retasking Jack Mic In/Retasking Jack = connector or socket Figure 2. Block Diagram OM18521 14

Section	Page
Intel® Desktop Board D945GCL Technical Product Specification	1
Revision History / Disclaimer	2
Preface	3
Intended Audience	3
What This Document Contains	3
Typographical Conventions	3
Contents	5
1 Product Description	9
1.1 Overview	10
1.1.1 Feature Summary	10
1.1.2 Board Layout	12
1.1.3 Block Diagram	14
1.2 Online Support	15
1.3 Processor	15
1.4 System Memory	16
1.4.1 Memory Configurations	18
1.5 Intel® 945G Chipset	20
1.5.1 Intel 945G Graphics Subsystem	20
1.5.2 USB	22
1.5.3 IDE Support	23
1.5.4 Real-Time Clock, CMOS SRAM, and Battery	24
1.6 PCI Express* Connectors	24
1.7 Legacy I/O Controller	25
1.7.1 Serial Port	25
1.7.2 Parallel Port	25
1.7.3 Diskette Drive Controller	25
1.7.4 Keyboard and Mouse Interface	25
1.8 Audio Subsystem	26
1.8.1 Audio Subsystem Software	26
1.8.2 Audio Connectors	26
1.8.3 6-Channel (5.1) Audio Subsystem	27
1.9 LAN Subsystem	28
1.9.1 LAN Subsystem Software	28
1.9.2 Intel® 82562G Physical Layer Interface Device	28
1.10 Hardware Management Subsystem	30
1.10.1 Hardware Monitoring and Fan Control ASIC	30
1.10.2 Chassis Intrusion and Detection	30
1.10.3 Fan Monitoring	30
1.10.4 Thermal Monitoring	31
1.11 Power Management	32
1.11.1 ACPI	32
1.11.2 Hardware Support	34
2 Technical Reference	39
2.1 Memory Resources	39
2.1.1 Addressable Memory	39
2.1.2 Memory Map	41
2.2 DMA Channels	41
2.3 Fixed I/O Map	42
2.4 PCI Configuration Space Map	43
2.5 Interrupts	44
2.6 PCI Conventional Interrupt Routing Map	45
2.7 Connectors and Headers	46
2.7.1 Back Panel Connectors	47
2.7.2 Component-side Connectors and Headers	48
2.8 Jumper Block	56
2.9 Mechanical Considerations	57
2.9.1 Form Factor	57
2.9.2 I/O Shield	58
2.10 Electrical Considerations	59
2.10.1 DC Loading	59
2.10.2 Add-in Board Considerations	59
2.10.3 Fan Header Current Capability	60
2.10.4 Power Supply Considerations	60
2.11 Thermal Considerations	61
2.12 Reliability	63
2.13 Environmental	64
3 Overview of BIOS Features	65
3.1 Introduction	65
3.2 BIOS Flash Memory Organization	66
3.3 Resource Configuration	66
3.3.1 PCI Autoconfiguration	66
3.3.2 PCI IDE Support	66
3.4 System Management BIOS (SMBIOS)	67
3.5 BIOS Updates	68
3.5.1 Language Support	68
3.5.2 Custom Splash Screen	68
3.6 Legacy USB Support	69
3.7 Boot Options	69
3.7.1 CD-ROM Boot	69
3.7.2 Network Boot	69
3.7.3 Booting Without Attached Devices	70
3.7.4 Changing the Default Boot Device During POST	70
3.8 Adjusting Boot Speed	71
3.8.1 Peripheral Selection and Configuration	71
3.8.2 BIOS Boot Optimizations	71
3.9 BIOS Security Features	72
4 Error Messages and Beep Codes	73
4.1 Speaker	73
4.2 BIOS Beep Codes	73
4.3 BIOS Error Messages	73
4.4 Port 80h POST Codes	74
5 Regulatory Compliance and Battery Disposal Information	79
5.1 Regulatory Compliance	79
5.1.1 Safety Regulations	79
5.1.2 European Union Declaration of Conformity Statement	80
5.1.3 Product Ecology Statements	81
5.1.4 EMC Regulations	85
5.1.5 Product Certification Markings (Board Level)	86

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Intel Desktop Board D945GCL Technical Product Specification

1.1.3

Block Diagram

Figure 2 is a block diagram of the major functional areas.

Intel 945G Chipset

Intel 82801GB

I/O Controller Hub

(ICH7)

Intel 82945G

Graphics and

Memory Controller

Hub (GMCH)

Serial Peripheral

Interface (SPI)

Flash Device

System Bus

(1066/800/533

MHz)

LGA775 Processor

Socket

Parallel ATA

IDE Connector

Diskette Drive

Connector

Legacy

I/O

Controller

PS/2 Keyboard

PS/2 Mouse

Parallel Port

Serial Port

Parallel ATA

IDE Interface

LPC

Bus

Hardware Monitoring

and Fan Control ASIC

OM18521

Audio

Codec

LAN

Connector

10/100

LAN PLC

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

Serial ATA IDE

Connectors (4)

Serial ATA

IDE Interface

VGA

Port

Display Interface

Channel A

DIMM

Channel B

DIMM

Back Panel/Front Panel

USB Ports

DMI Interconnect

LAN Connect

Interface

PCI Express x1 Slot 1

PCI Express x1 Interface

Line Out/Retasking Jack

Mic In

Line In/Retasking Jack

Mic In/Retasking Jack

Line Out

Figure 2.

Block Diagram