Intel D845GRG Guide

Technical Product Specification
for Intel®Desktop Boards
using the Intel®845G Chipset
April 2002
Order Number: A81229-001
Intel®Desktop Boards using the Intel®845G Chipset 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 Specification Update for Intel Desktop Boards using the Intel 845G Chipset.

Revision History
Revision Revision History Date
-001 First release of the Technical Product Specification for Intel®Desktop
Boards using the Intel®845G Chipset.
April 2002
This product specification applies to only standard Intel Desktop Boards using the Intel 845G
Chipset with BIOS identifier RG84510.86A.
Changes to this specification will be published in the Specification Update for Intel Desktop
Boards using the Intel 845G Chipset before being incorporated into a revision of this document.
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL®PRODUCTS. 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 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 products are not intended for use in medical, life saving, or life sustaining applications or for any other application in
which the failure of the Intel product could create a situation where personal injury or death may occur.
Intel may make changes to specifications, product descriptions, and plans at any time, without notice.
Intel Desktop Boards using the Intel 845G Chipset may contain design defects or errors known as errata that 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, Celeron, and LANDesk 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.
Copyright 2002, Intel Corporation. All rights reserved.

iii
Preface
This Technical Product Specification (TPS) describes the features common to Intel Desktop
Boards using the Intel 845G Chipset. This specification is to be used with Product Supplement
documents (available separately) that describe features unique to individual members of the
product family.
Intended Audience
The TPS is intended to provide detailed, technical information about Intel Desktop Boards using
the Intel 845G Chipset and their components to the vendors, system integrators, and other
engineers and technicians who need this level of information. It is specifically not intended for
general audiences.
What This Document Contains
Chapter Description
1 A description of the hardware used on these Intel Desktop boards
2 A description of the resources of the Desktop Boards
3 An overview of the BIOS Setup program
4 The contents of the BIOS Setup program’s menus and submenus
5 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.
Footnotes, Notes, Integrator’s Notes, Cautions, and Warnings
Footnotes
Footnotes call attention to features that may not be standard or the implementation of which may
vary depending on the Intel Desktop Board being used. Chapter 1 of each Product Supplement
Document includes a footnote cross reference table.
✏ NOTE
Notes call attention to important information.

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
iv
# INTEGRATOR’S NOTES
Integrator’s notes are used to call attention to information that may be useful to system
integrators.
CAUTION
Cautions are included to help you avoid damaging hardware or losing data.
WARNING
Warnings indicate conditions, which if not observed, can cause personal injury.
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, 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.

v
Contents
1Product Description
1.1 Overview ..................................................................................................................... 9
1.1.1 Feature Summary ......................................................................................... 9
1.1.2 Block Diagram..............................................................................................11
1.2 Online Support ...........................................................................................................12
1.3 Operating System Support .........................................................................................12
1.4 Design Specifications .................................................................................................13
1.5 Processor ...................................................................................................................17
1.6 System Memory .........................................................................................................18
1.7 Intel®845G Chipset....................................................................................................20
1.7.1 Intel 845G Graphics Subsystem...................................................................20
1.7.2 USB..............................................................................................................26
1.7.3 IDE Support .................................................................................................26
1.7.4 Real-Time Clock, CMOS SRAM, and Battery...............................................27
1.8 I/O Controller ..............................................................................................................27
1.8.1 Serial Port ....................................................................................................28
1.8.2 Parallel Port..................................................................................................28
1.8.3 Diskette Drive Controller ..............................................................................28
1.8.4 Keyboard and Mouse Interface ....................................................................28
1.9 Audio Subsystem........................................................................................................28
1.9.1 Audio Connectors.........................................................................................29
1.9.2 Audio Subsystem Software ..........................................................................29
1.10 LAN Subsystem..........................................................................................................30
1.10.1 Intel®82562ET Platform LAN Connect Device.............................................30
1.10.2 RJ-45 LAN Connector with Integrated LEDs ................................................30
1.10.3 LAN Subsystem Software ............................................................................31
1.11 CNR .....................................................................................................................31
1.12 Hardware Management Subsystem............................................................................32
1.12.1 Hardware Monitoring ASICs.........................................................................32
1.12.2 Fan Monitoring .............................................................................................33
1.12.3 Chassis Intrusion and Detection...................................................................33
1.13 Power Management ...................................................................................................34
1.13.1 ACPI.............................................................................................................34
1.13.2 Hardware Support ........................................................................................36
2Technical Reference
2.1 Introduction.................................................................................................................41
2.2 Memory Map ..............................................................................................................41
2.3 Fixed I/O Map.............................................................................................................42
2.4 DMA Channels ...........................................................................................................43
2.5 PCI Configuration Space Map ....................................................................................43
2.6 Interrupts ....................................................................................................................44
2.7 PCI Interrupt Routing Map..........................................................................................45
2.8 Environmental ............................................................................................................47

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
vi
3BIOS Overview
3.1 Introduction.................................................................................................................49
3.2 BIOS Flash Memory Organization ..............................................................................49
3.3 Resource Configuration..............................................................................................49
3.3.1 PCI Autoconfiguration ..................................................................................49
3.3.2 PCI IDE Support...........................................................................................50
3.4 System Management BIOS (SMBIOS).......................................................................50
3.5 Legacy USB Support ..................................................................................................51
3.6 BIOS Updates ............................................................................................................52
3.6.1 Language Support........................................................................................52
3.6.2 Custom Splash Screen.................................................................................52
3.7 Recovering BIOS Data ...............................................................................................53
3.8 Boot Options...............................................................................................................53
3.8.1 CD-ROM Boot..............................................................................................53
3.8.2 Network Boot................................................................................................54
3.8.3 Booting Without Attached Devices ...............................................................54
3.8.4 Changing the Default Boot Device During POST..........................................54
3.9 Fast Booting Systems with Intel®Rapid BIOS Boot....................................................54
3.9.1 Peripheral Selection and Configuration ........................................................54
3.9.2 Intel Rapid BIOS Boot ..................................................................................55
3.10 BIOS Security Features..............................................................................................55
4BIOS Setup Program
4.1 Introduction.................................................................................................................57
4.2 Maintenance Menu .....................................................................................................58
4.3 Main Menu..................................................................................................................59
4.4 Advanced Menu..........................................................................................................60
4.4.1 PCI Configuration Submenu.........................................................................61
4.4.2 Boot Configuration Submenu .......................................................................63
4.4.3 Peripheral Configuration Submenu...............................................................64
4.4.4 IDE Configuration Submenu.........................................................................66
4.4.5 Diskette Configuration Submenu..................................................................69
4.4.6 Event Log Configuration Submenu...............................................................70
4.4.7 Video Configuration Submenu......................................................................71
4.4.8 USB Configuration Submenu .......................................................................72
4.4.9 Chipset Configuration Submenu...................................................................73
4.5 Security Menu ............................................................................................................75
4.6 Power Menu ...............................................................................................................76
4.6.1 ACPI Submenu ............................................................................................76
4.7 Boot Menu..................................................................................................................77
4.7.1 Boot Device Priority Submenu......................................................................78
4.7.2 Hard Disk Drives Submenu ..........................................................................79
4.7.3 Removable Devices Submenu .....................................................................79
4.7.4 ATAPI CD-ROM Drives Submenu................................................................80
4.8 Exit Menu ...................................................................................................................80

Contents
vii
5Error Messages and Beep Codes
5.1 BIOS Error Messages.................................................................................................81
5.2 Port 80h POST Codes................................................................................................83
5.3 Bus Initialization Checkpoints .....................................................................................87
5.4 Speaker .....................................................................................................................88
5.5 BIOS Beep Codes ......................................................................................................88
Figures
1. Block Diagram................................................................................................................11
Tables
1. Feature Summary........................................................................................................ 9
2. Specifications .............................................................................................................13
3. Supported DDR DIMM Configurations........................................................................19
4. Supported SDR DIMM Configurations ........................................................................19
5. Direct Draw Supported Modes....................................................................................21
6. Video BIOS Video Modes Supported for Analog CRTs...............................................22
7. Supported Configuration Modes .................................................................................23
8. Details of bpp Configuration Modes............................................................................24
9. LAN Connector LED States ........................................................................................30
10. Effects of Pressing the Power Switch .........................................................................34
11. Power States and Targeted System Power ................................................................35
12. Wake-up Devices and Events.....................................................................................36
13. Fan Connector Function/Operation for Desktop Boards with a Hardware
Monitoring ASIC .........................................................................................................37
14. Fan Connector Function/Operation for Desktop Boards with a Hardware
Monitoring and Fan Control ASIC...............................................................................38
15. System Memory Map..................................................................................................41
16. Fixed I/O Map.............................................................................................................42
17. DMA Channels ...........................................................................................................43
18. PCI Configuration Space Map ....................................................................................43
19. Interrupts ....................................................................................................................44
20. PCI Interrupt Routing Map..........................................................................................46
21. Desktop Board Environmental Specifications .............................................................47
22. Boot Device Menu Options.........................................................................................54
23. Supervisor and User Password Functions ..................................................................56
24. BIOS Setup Program Menu Bar .................................................................................57
25. BIOS Setup Program Function Keys ..........................................................................57
26. Maintenance Menu .....................................................................................................58
27. Main Menu..................................................................................................................59
28. Advanced Menu..........................................................................................................60
29. PCI Configuration Submenu .......................................................................................61
30. Boot Configuration Submenu......................................................................................63
31. Peripheral Configuration Submenu.............................................................................64
32. IDE Configuration Submenu .......................................................................................66
33. Primary/Secondary IDE Master/Slave Submenus.......................................................67

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
viii
34. Diskette Configuration Submenu ................................................................................69
35. Event Log Configuration Submenu .............................................................................70
36. Video Configuration Submenu....................................................................................71
37. USB Configuration Submenu......................................................................................72
38. Chipset Configuration Submenu .................................................................................73
39. Security Menu ............................................................................................................75
40. Power Menu ...............................................................................................................76
41. ACPI Submenu...........................................................................................................76
42. Boot Menu..................................................................................................................77
43. Boot Device Priority Submenu....................................................................................78
44. Hard Disk Drives Submenu ........................................................................................79
45. Removable Devices Submenu....................................................................................79
46. ATAPI CD-ROM Drives Submenu ..............................................................................80
47. Exit Menu ...................................................................................................................80
48. BIOS Error Messages.................................................................................................81
49. Uncompressed INIT Code Checkpoints......................................................................83
50. Boot Block Recovery Code Checkpoints ....................................................................83
51. Runtime Code Uncompressed in F000 Shadow RAM ................................................84
52. Bus Initialization Checkpoints .....................................................................................87
53. Upper Nibble High Byte Functions..............................................................................87
54. Lower Nibble High Byte Functions..............................................................................88
55. Beep Codes................................................................................................................89

9
1 Product Description
1.1 Overview
1.1.1 Feature Summary
Table 1 summarizes the major features.
Table 1. Feature Summary
Form Factors1• ATX
• microATX
Processor • Support for an Intel®Pentium®4 processor in a µPGA478 socket with a
400/533 MHz system bus
• Support for an Intel®Celeron®processor in a µPGA478 socket with a 400 MHz
system bus
Memory2• Two DIMM sockets supporting one of the following:
−2.5 V (only) 184-pin 200/266 MHz Double Data Rate (DDR) SDRAM DIMMs
with gold-plated contacts
−3.3 V (only) 168-pin 133 MHz Single Data Rate (SDR) SDRAM DIMMs with
gold-plated contacts
• Support for up to 2 GB system memory
NOTE: Desktop Boards using the Intel®845G Chipset have been designed to
support DIMMs based on 512 Mbit technology for a maximum onboard
capacity of up to 2 GB, but this technology has not been validated.
Chipset Intel 845G Chipset, consisting of:
• Intel®82845G Graphics and Memory Controller Hub (GMCH)
• Intel®82801DB I/O Controller Hub (ICH4)
• 4 Mbit Firmware Hub (FWH)
Audio3Audio subsystem for AC ‘97 processing using the Analog Devices AD1981A codec
continued
1Form factors are product-dependent. For more information, refer to the Product Supplement Document for
your Desktop Board.
2Memory support (DDR SDRAM or SDR SDRAM) is product-dependent. For more information, refer to the
Product Supplement Document for your Desktop Board.
3Contact your Intel sales representative to determine if the audio subsystem is present on your Intel
Desktop Board.

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
10
Table 1. Feature Summary (continued)
I/O Control LPC Bus I/O controller (SMSC LPC47M172 or National Semiconductor PC87372)
Video • Intel®Extreme Graphics controller
• AGP connector supporting 1x, 2x, and 4x AGP cards (1.5 V only) or an AGP
Digital Display (ADD) card
• Integrated retention mechanism
Peripheral
Interfaces
• Up to six USB ports
• One serial port
• One parallel port
• Two IDE interfaces with UDMA 33, ATA-66/100 support
• One diskette drive interface
• PS/2†keyboard and mouse ports
• Three fan connectors
Hardware
Management
Subsystem4
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• Two fan sense inputs used to monitor fan activity
• Fan speed control
• Chassis intrusion detection
• Hardware management ASIC
CNR5One Communication and Networking Riser (CNR) connector
LAN5Intel®82562ET 10/100 Mbit/sec Platform LAN Connect (PLC) device
Instantly Available
PC Technology
• Support for PCI Local Bus Specification Revision 2.2
• Suspend to RAM support
• Wake on PCI, CNR, RS-232, front panel, PS/2 devices, and USB ports
For information about Refer to
The board’s compliance level with ACPI, Plug and Play, and SMBIOS Section 1.4, page 13
Available configurations for Intel Desktop Boards using the Intel 845G Chipset Section 1.2, page 12
✏ NOTE
The LAN and the CNR features are mutually exclusive.
4Contact your Intel sales representative to determine which type of hardware monitoring ASIC is present on
your Intel Desktop Board.
5The CNR connector and the LAN subsystem are mutually exclusive features. Contact your Intel sales
representative to determine which of these features is present on your Intel Desktop Board.

Product Description
11
1.1.2 Block Diagram
Figure 1 is a block diagram of the major functional areas of the Desktop Boards.
Intel 845G Chipset
Intel 82801DB
I/O Controller Hub
(ICH4)
Intel 82845G
Graphics and
Memory Controller
Hub (GMCH)
4 Mbit
Firmware Hub
(FWH)
AHA
Bus
System Bus
(400/533 MHz)
µPGA478
Processor Socket
Primary/
Secondary IDE
Diskette Drive
Connector
LPC Bus
I/O
Controller PS/2 Keyboard
PS/2 Mouse
Parallel Port
Serial Port
UDMA 33 and
ATA-66/100
LPC
Bus
Hardware
Management
ASIC*
OM13570
AD1981A
Audio Codec Auxiliary Line In
Mic In
Line Out
CD-ROM
Line In
CNR
Connector*
LAN
Connector*
Physical
Layer
Interface*
CSMA/CD
Unit Interface
DIMM Banks (2)
AGP
Interface
4X AGP
Connector
(1.5 V only)
= connector or socket
PCI Bus
SMBus
AC Link
Back Panel /
Front Panel
USB Ports
USB
VGA Port
Display
Interface
Memory Bus
*For specific information on this feature, refer to the Product Supplement Document for your Desktop Board.
PCI Slot 1
PCI Slot 2
PCI Slot 3
PCI Slot n*
SMBus
SMBus
SMBus
Figure 1. Block Diagram

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
12
1.2 Online Support
To find information about…Visit this World Wide Web site:
Intel Desktop Boards using the Intel 845G
Chipset under “Product Info”or
“Customer Support”
http://www.intel.com/design/motherbd
http://support.intel.com/support/motherboards/desktop
Processor data sheets http://www.intel.com/design/litcentr
ICH4 data sheet 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
1.3 Operating System Support
The Desktop Boards described in this document support drivers for all of the onboard hardware
and subsystems under the following operating systems:
• Microsoft Windows†98 SE
• Windows ME
• Windows NT†4.0
• Windows 2000
• Windows XP
For information about Refer to
Supported drivers Section 1.2
✏ NOTE
Third party vendors may offer other drivers.
✏ NOTE
USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently
supported by any other operating system.

Product Description
13
1.4 Design Specifications
Table 2 lists the specifications applicable to these Desktop Boards.
Table 2. Specifications
Reference
Name
Specification
Title
Version, Revision Date,
and Ownership
The information is
available from…
AC ’97 Audio Codec ’97 Revision 2.2,
September 2000,
Intel Corporation.
ftp://download.intel.com/ial/
scalableplatforms/ac97r22.pdf
ACPI Advanced Configuration
and Power Interface
Specification
Version 1.0b,
July 01, 1998,
Intel Corporation,
Microsoft Corporation,
and Toshiba Corporation.
http://www.acpi.info/
spec10b.htm
AGP Accelerated Graphics Port
Interface Specification
Revision 2.0,
May 4, 1998,
Intel Corporation.
http://www.agpforum.org/
specs_specs.htm
AMI BIOS6AMIBIOS Desktop Core 7.0 AMIBIOS 7.0,
August 8, 2001,
American Megatrends, Inc.
http://www.ami.com/support/
doc/amibiosdesktop.pdf
ATA/
ATAPI-5
Information Technology-AT
Attachment with Packet
Interface - 5
(ATA/ATAPI-5)
Revision 3,
February 29, 2000,
Contact: T13 Chair,
Seagate Technology.
http://www.t13.org
ATX ATX Specification Version 2.03,
December 1998,
Intel Corporation.
http://www.formfactors.org/
developer/specs/atx/
atxspecs.htm
ATX12V
Power
Supply
ATX/ATX12V Power
Supply Design Guide
Version 1.2,
August 2000,
Intel Corporation.
http://www.formfactors.org/
developer/specs/atx/
atxspecs.htm
BIS Boot Integrity Services
(BIS) Application
Programming Interface
(API)
Version 1.0
August 4, 1999,
Intel Corporation.
http://www.intel.com/labs/
manage/wfm/wfmspecs.htm
CNR Communication and
Network Riser (CNR)
Specification
Revision 1.2,
November 8, 2001,
Intel Corporation.
http://developer.intel.com/
technology/cnr/index.htm
continued
6Some Desktop Boards may use a different BIOS core. For more information, refer to the Product
Supplement Document for your Desktop Board.

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
14
Table 2. Specifications (continued)
Reference
Name
Specification
Title
Version, Revision Date and
Ownership
The information is
available from…
DDR
SDRAM7
Double Data Rate (DDR)
SDRAM Specification
Version 1.0,
June 2000,
JEDEC Solid State Technology
Association.
http://www.jedec.org/
Design Specification for
a 184 Pin DDR
Unbuffered DIMM
Revision 1.0,
October 2001,
JEDEC Solid State Technology
Association.
http://www.jedec.org/
Intel®JEDEC DDR
200/266 Unbuffered
DIMM Specification
Addendum
Revision 0.9,
September 27, 2001,
Intel Corporation.
http://developer.intel.com/
technology/memory/
index.htm
DVI Digital Visual Interface
(DVI) Specification
Revision 1.0,
April 02, 1999,
Digital Display Working Group.
http://www.ddwg.org/
downloads.html
EHCI Enhanced Host
Controller Interface
Specification for
Universal Serial Bus
Revision 1.0,
March 12, 2002,
Intel Corporation.
http://developer.intel.com/
technology/usb/download/
ehci-r10.pdf
EPP IEEE Std 1284.1-1997
(Enhanced Parallel Port)
Version 1.7,
1997,
Institute of Electrical and
Electronic Engineers.
http://standards.ieee.org/
reading/ieee/std_public/
description/busarch/
1284.1-1997_desc.html
El Torito Bootable CD-ROM
Format Specification
Version 1.0,
January 25, 1995,
Phoenix Technologies Limited
and International Business
Machines Corporation.
http://www.phoenix.com/
PlatSS/products/specs.html
Front Panel Front Panel I/O
Connectivity Design
Guide
Version 1.0,
October 2000,
Intel Corporation.
http://www.formfactors.org/
formfactors/
front_panel_io.htm
LPC Low Pin Count Interface
Specification
Revision 1.0,
September 29, 1997,
Intel Corporation.
http://www.intel.com/
design/chipsets/industry/
lpc.htm
microATX microATX Motherboard
Interface Specification
Version 1.0,
December 1997,
Intel Corporation.
http://www.formfactors.org/
developer/specs/microatx/
microatxspecs.htm
continued
7Memory support (DDR SDRAM or SDR SDRAM) is product-dependent. For more information, refer to the
Product Supplement Document for your Desktop Board.

Product Description
15
Table 2. Specifications (continued)
Reference
Name
Specification
Title
Version, Revision Date
and Ownership
The information is
available from…
PCI PCI Local Bus
Specification
Revision 2.2,
December 18, 1998,
PCI Special Interest Group.
http://www.pcisig.com/
specifications
PCI Bus Power
Management Interface
Specification
Revision 1.1,
December 18, 1998,
PCI Special Interest Group.
http://www.pcisig.com/
specifications
Plug and
Play
Plug and Play BIOS
Specification
Version 1.0a,
May 5, 1994,
Compaq Computer Corporation,
Phoenix Technologies Limited,
and Intel Corporation.
http://www.microsoft.com/
hwdev/respec/
pnpspecs.htm
PXE Preboot Execution
Environment
Version 2.1,
September 20, 1999,
Intel Corporation.
ftp://download.intel.com/ial/
wfm/pxespec.pdf
PC SDRAM Unbuffered
DIMM Specification
Revision 1.0,
February 1998,
Intel Corporation.
http://www.intel.com/
technology/memory
PC SDRAM Specification Revision 1.7,
November 1999,
Intel Corporation.
http://www.intel.com/
technology/memory
SDRAM8
PC Serial Presence
Detect (SPD)
Specification
Revision 1.2B,
November 1999,
Intel Corporation.
http://www.intel.com/
technology/memory
SFX12V
Power
Supply
SFX/SFX12V Power
Supply Design Guide
Revision 2.0,
May 2001,
Intel Corporation.
http://www.formfactors.org/
developer/specs/sfx/
sfx12v.pdf
SMBIOS System Management
BIOS
Version 2.3.1,
March 16, 1999,
American Megatrends
Incorporated,
Award Software International
Incorporated,
Compaq Computer Corporation,
Dell Computer Corporation,
Hewlett-Packard Company,
Intel Corporation,
International Business Machines
Corporation,
Phoenix Technologies Limited,
and SystemSoft Corporation.
http://www.dmtf.org/
download/standards/
DSP0119.pdf
continued
8Memory support (DDR SDRAM or SDR SDRAM) is product-dependent. For more information, refer to the
Product Supplement Document for your Desktop Board.

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
16
Table 2. Specifications (continued)
Reference
Name
Specification
Title
Version, Revision Date
and Ownership
The information is
available from…
UHCI Universal Host Controller
Interface Design Guide
Revision 1.1,
March 1996,
Intel Corporation.
http://www.usb.org/
developers/docs.html
Revision 1.1,
September 23, 1998,
Compaq Computer Corporation,
Intel Corporation,
Microsoft Corporation, and
NEC Corporation.
http://www.usb.org/
developers/docs.html
USB Universal Serial Bus
Specification
Revision 2.0,
April 27, 2000,
Compaq Computer Corporation,
Hewlett-Packard Company,
Lucent Technologies Inc.,
Intel Corporation,
Microsoft Corporation,
NEC Corporation, and
Koninklijke Philips Electronics
N.V.
http://www.usb.org/
developers/docs.html
WfM Wired for Management
Baseline
Version 2.0,
December 18, 1998,
Intel Corporation.
http://www.intel.com/labs/
manage/wfm/
wfmspecs.htm

Product Description
17
1.5 Processor
CAUTION
Use of unsupported processors can damage the Desktop Board, the processor, and the power
supply. See the Specification Update for Intel®Desktop Boards using the Intel 845G Chipset for
the most up-to-date list of supported processors for these boards.
The Desktop Boards support the following9:
• A Pentium 4 processor in a µPGA478 socket with a system bus of 400/533 MHz
• A Celeron processor in a µPGA478 socket with a system bus of 400 MHz
All supported onboard memory can be cached. See the processor’s data sheet for cachability
limits.
# INTEGRATOR’S NOTES
• Use only ATX12V- or SFX12V-compliant power supplies with these Desktop Boards.
ATX12V and SFX12V power supplies have an additional power lead that provides
required supplemental power for the processor. Always connect the 20-pin and 4-pin
leads of ATX12V and SFX12V power supplies to the corresponding connectors on the
Desktop Boards, otherwise the board will not boot.
• Do not use a standard ATX power supply. The board will not boot with a standard ATX
power supply.
For information about Refer to
Processor support Section 1.2, page 12
Processor usage Section 1.2, page 12
9Processor support is product-dependent. For more information, refer to the Product Supplement
Document for your Desktop Board.

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
18
1.6 System Memory
The Desktop Boards provide the following memory features:
• Two DIMM sockets supporting one of the following10:
 2.5 V (only) 184-pin 200/266 MHz Double Data Rate (DDR) SDRAM DIMMs with gold-
plated contacts, or
 3.3 V (only) 168-pin 133 MHz Single Data Rate (SDR) SDRAM DIMMs with gold-plated
contacts
• Unbuffered non-ECC DIMMs only
• Maximum total system memory: 2 GB; minimum total system memory: 64 MB
• Serial Presence Detect (SPD) DIMMs only
• Suspend to RAM
CAUTION
Do not use ECC DIMMs with these Desktop Boards. Using ECC DIMMs could damage the
Desktop Board.
# INTEGRATOR’S NOTES
• Registered DIMMs are not supported on these Desktop Boards.
• Remove the AGP video card before installing or upgrading memory to avoid interference
with the memory retention mechanism.
• These Desktop Boards have been designed to support DIMMs based on 512 Mbit
technology for a maximum onboard capacity of up to 2 GB, but this technology has not
been validated on this board.
✏ NOTE
To be fully compliant with all applicable DDR SDRAM and PC133 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.
For information about Refer to
Obtaining DDR SDRAM specifications Section 1.4, page 13
Obtaining the PC Serial Presence Detect (SPD) Specification Section 1.4, page 13
10 Memory support (DDR SDRAM or SDR SDRAM) is product-dependent. For more information, refer to the
Product Supplement Document for your Desktop Board.

Product Description
19
Table 3 lists the supported DDR DIMM configurations.
Table 3. Supported DDR DIMM Configurations
DIMM
Capacity
Configuration
(Note)
DDR SDRAM
Density
DDR SDRAM Organization
Front-side/Back-side
Number of DDR
SDRAM Devices
32 MB SS 64 Mbit 4 M x 16/empty 4
64 MB SS 64 Mbit 8 M x 8/empty 8
64 MB SS 128 Mbit 8 M x 16/empty 4
128 MB DS 64 Mbit 8 M x 8/8 M x 8 16
128 MB SS 128 Mbit 16 M x 8/empty 8
128 MB SS 256 Mbit 16 M x 16/empty 4
256 MB DS 128 Mbit 16 M x 8/16 M x 8 16
256 MB SS 256 Mbit 32 M x 8/empty 8
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16
Note: In this column, “DS”refers to double-sided memory modules (containing DDR SDRAM devices on both sides)
and “SS”refers to single-sided memory modules (containing DDR SDRAM devices on only one side).
Table 4 lists the supported SDR DIMM configurations.
Table 4. Supported SDR DIMM Configurations
DIMM
Capacity
Configuration
(Note)
SDR SDRAM
Density
SDR SDRAM Organization
Front-side/Back-side
Number of SDR
SDRAM devices
32 MB SS 64 Mbit 4 M x 16/empty 4
64 MB DS 64 Mbit 4 M x 16/4 M x 16 8
64 MB SS 64 Mbit 8 M x 8/empty 8
64 MB SS 128 Mbit 8 M x 16/empty 4
128 MB DS 64 Mbit 8 M x 8/8 M x 8 16
128 MB DS 128 Mbit 8 M x 16/8 M x 16 8
128 MB SS 128 Mbit 16 M x 8/empty 8
128 MB SS 256 Mbit 16 M x 16/empty 4
256 MB DS 128 Mbit 16 M x 8/16 M x 8 16
256 MB DS 256 Mbit 16 M x 16/16 M x 16 8
256 MB SS 256 Mbit 32 M x 8/empty 8
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16
Note: In this column, “DS”refers to double-sided memory modules (containing SDR SDRAM devices on both sides)
and “SS”refers to single-sided memory modules (containing SDR SDRAM devices on only one side).

Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
20
1.7 Intel®845G Chipset
The Intel 845G chipset consists of the following devices:
• Intel 82845G Graphics and Memory Controller Hub (GMCH) with Accelerated Hub
Architecture (AHA) bus
• Intel 82801DB I/O Controller Hub (ICH4) with AHA bus
• 4 Mbit Firmware Hub (FWH)
The GMCH is a centralized controller for the system bus, the memory bus, the AGP bus, and the
Accelerated Hub Architecture interface. The ICH4 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 845G chipset http://developer.intel.com
Resources used by the chipset Chapter 2
1.7.1 Intel 845G Graphics Subsystem
The Intel 845G chipset contains two separate, mutually exclusive graphics options. Either the
Intel Extreme Graphics controller (contained within the 82845G GMCH) is used, or an AGP
add-in card can be used. When an AGP add-in card is installed, the Intel Extreme Graphics
controller is disabled.
1.7.1.1 Intel®Extreme Graphics Controller
The Intel Extreme Graphics controller features the following:
• Integrated graphics controller
 32 bpp (Bits Per Pixel) graphics engine
 200 MHz core frequency
 256-bit internal data path for 2-D and 3-D graphics
 Motion video acceleration
• 3-D graphics visual and texturing enhancement
• Display
 Integrated 24-bit 350 MHz RAMDAC
 DDC2B compliant interface
• Video
 Dual monitor synchronous display
 Hardware motion compensation for software MPEG2 decode
 Two multiplexed DVO port interfaces with 165 MHz pixel clocks using an AGP Digital
Display (ADD) card
• Dynamic Video Memory Technology (DVMT) support up to 64 MB (driver dependent)
For information about Refer to
DVMT Section 1.7.1.2, page 24