Intel D845EPT2 User manual

Intel®Desktop Board
D845EBG2/D845EPT2
Technical Product Specification
April 2002
Order Number: A84913-001
The Intel®Desktop Boards D845EBG2/D845EPT2 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 D845EBG2/D845EPT2 Specification Update.

Revision History
Revision Revision History Date
-001 First Release of the Intel®Desktop Board D845EBG2/D845EPT2
Technical Product Specification. April 2002
This product specification applies to only standard Intel®Desktop Boards D845EBG2 and
D845EPT2 with BIOS identifier PT84520A.86A.
Changes to this specification will be published in the Intel Desktop Board D845EBG2/D845EPT2
Specification Update 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.
The Intel®Desktop Boards D845EBG2 and D845EPT2 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) specifies the board layout, components, connectors,
power and environmental requirements, and the BIOS for these Intel®Desktop Boards:
D845EBG2 and D845EPT2. It describes the standard product and available manufacturing
options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Desktop Boards
D845EBG2 and D845EPT2 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 the Desktop Boards D845EBG2 and
D845EPT2
2 A map of the resources of the Desktop Boards
3 The features supported by 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.
Notes, Cautions, and Warnings
✏ NOTE
Notes call attention to important information.
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.

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
iv
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 D845EBG2 and D845EPT2, 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 Board Differences.......................................................................................................11
1.2 Overview ....................................................................................................................12
1.2.1 Feature Summary ........................................................................................12
1.2.2 Manufacturing Options.................................................................................13
1.2.3 Board Layouts..............................................................................................14
1.2.4 Block Diagram..............................................................................................16
1.3 Online Support ...........................................................................................................17
1.4 Operating System Support .........................................................................................17
1.5 Design Specifications .................................................................................................18
1.6 Processor...................................................................................................................21
1.7 System Memory .........................................................................................................22
1.8 Intel®845E Chipset ....................................................................................................24
1.8.1 AGP .............................................................................................................25
1.8.2 USB..............................................................................................................26
1.8.3 IDE Support .................................................................................................27
1.8.4 Real-Time Clock, CMOS SRAM, and Battery...............................................28
1.9 I/O Controller..............................................................................................................28
1.9.1 Serial Ports ..................................................................................................28
1.9.2 Parallel Port..................................................................................................29
1.9.3 Diskette Drive Controller ..............................................................................29
1.9.4 Keyboard and Mouse Interface ....................................................................29
1.10 Audio Subsystem (Optional).......................................................................................30
1.10.1 Audio Connectors.........................................................................................31
1.10.2 Audio Subsystem Software..........................................................................31
1.11 LAN Subsystem (Optional).........................................................................................32
1.11.1 Intel®82562ET Platform LAN Connect Device.............................................32
1.11.2 RJ-45 LAN Connector with Integrated LEDs................................................32
1.11.3 LAN Subsystem Software ............................................................................33
1.12 CNR (Optional)...........................................................................................................33
1.13 Hardware Management Subsystem............................................................................34
1.13.1 Hardware Monitoring ASICs.........................................................................35
1.13.2 Fan Monitoring.............................................................................................36
1.13.3 Chassis Intrusion and Detection...................................................................37
1.14 Power Management ...................................................................................................37
1.14.1 ACPI.............................................................................................................38
1.14.2 Hardware Support........................................................................................40

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
vi
2Technical Reference
2.1 Introduction.................................................................................................................47
2.2 Memory Map ..............................................................................................................47
2.3 Fixed I/O Map.............................................................................................................48
2.4 DMA Channels ...........................................................................................................49
2.5 PCI Configuration Space Map....................................................................................49
2.6 Interrupts....................................................................................................................50
2.7 PCI Interrupt Routing Map..........................................................................................51
2.8 Connectors.................................................................................................................53
2.8.1 Back Panel Connectors................................................................................54
2.8.2 Internal I/O Connectors................................................................................57
2.8.3 External I/O Connectors...............................................................................70
2.9 Jumper Blocks............................................................................................................74
2.9.1 Front Panel Audio Connector/Jumper Block.................................................74
2.9.2 BIOS Setup Configuration Jumper Block......................................................75
2.10 Mechanical Considerations.........................................................................................76
2.10.1 D845EBG2 Form Factor...............................................................................76
2.10.2 D845EPT2 Form Factor...............................................................................77
2.10.3 I/O Shield.....................................................................................................78
2.11 Electrical Considerations............................................................................................80
2.11.1 Power Consumption.....................................................................................80
2.11.2 Add-in Board Considerations........................................................................80
2.11.3 Standby Current Requirements....................................................................81
2.11.4 Fan Connector Current Capability................................................................82
2.11.5 Power Supply Considerations ......................................................................83
2.12 Thermal Considerations..............................................................................................83
2.13 Reliability....................................................................................................................85
2.14 Environmental ............................................................................................................85
2.15 Regulatory Compliance ..............................................................................................86
2.15.1 Safety Regulations.......................................................................................86
2.15.2 EMC Regulations .........................................................................................86
2.15.3 Product Certification Markings (Board Level) ...............................................87
3Overview of BIOS Features
3.1 Introduction.................................................................................................................89
3.2 BIOS Flash Memory Organization..............................................................................90
3.3 Resource Configuration..............................................................................................90
3.3.1 PCI Autoconfiguration ..................................................................................90
3.3.2 PCI IDE Support...........................................................................................90
3.4 System Management BIOS (SMBIOS).......................................................................91
3.5 Legacy USB Support..................................................................................................91
3.6 BIOS Updates ............................................................................................................92
3.6.1 Language Support........................................................................................93
3.6.2 Custom Splash Screen.................................................................................93
3.7 Recovering BIOS Data...............................................................................................93

Contents
vii
3.8 Boot Options...............................................................................................................94
3.8.1 CD-ROM and Network Boot.........................................................................94
3.8.2 Booting Without Attached Devices...............................................................94
3.9 Fast Booting Systems with Intel®Rapid BIOS Boot....................................................94
3.9.1 Peripheral Selection and Configuration........................................................94
3.9.2 Intel Rapid BIOS Boot..................................................................................95
3.10 BIOS Security Features..............................................................................................96
4BIOS Setup Program
4.1 Introduction.................................................................................................................97
4.2 Maintenance Menu.....................................................................................................98
4.3 Main Menu..................................................................................................................99
4.4 Advanced Menu........................................................................................................100
4.4.1 PCI Configuration Submenu.......................................................................101
4.4.2 Boot Configuration Submenu .....................................................................102
4.4.3 Peripheral Configuration Submenu.............................................................103
4.4.4 IDE Configuration Submenu.......................................................................105
4.4.5 Diskette Configuration Submenu................................................................108
4.4.6 Event Log Configuration Submenu.............................................................109
4.4.7 Video Configuration Submenu....................................................................110
4.4.8 USB Configuration Submenu .....................................................................111
4.4.9 Chipset Configuration Submenu.................................................................112
4.5 Security Menu ..........................................................................................................113
4.6 Power Menu.............................................................................................................114
4.6.1 ACPI Submenu ..........................................................................................114
4.7 Boot Menu................................................................................................................115
4.7.1 Boot Device Priority Submenu....................................................................116
4.7.2 Hard Disk Drives Submenu........................................................................117
4.7.3 Removable Devices Submenu...................................................................117
4.7.4 ATAPI CD-ROM Drives Submenu..............................................................118
4.8 Exit Menu .................................................................................................................118
5Error Messages and Beep Codes
5.1 BIOS Error Messages...............................................................................................119
5.2 Port 80h POST Codes..............................................................................................121
5.3 Bus Initialization Checkpoints...................................................................................125
5.4 Speaker ...................................................................................................................126
5.5 BIOS Beep Codes....................................................................................................126
Figures
1. Desktop Board D845EBG2 Components....................................................................14
2. Desktop Board D845EPT2 Components ....................................................................15
3. Block Diagram............................................................................................................16
4. Intel 845E Chipset Block Diagram..............................................................................24
5. USB Port Configuration ..............................................................................................26
6. Audio Subsystem Block Diagram................................................................................30
7. ICH4 and CNR Signal Interface..................................................................................33
8. Thermal Monitoring.....................................................................................................36

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
viii
9. Location of the Standby Power Indicator LED ............................................................44
10. Back Panel Connectors..............................................................................................54
11. Audio Connectors.......................................................................................................58
12. Power and Hardware Control Connectors ..................................................................60
13. D845EBG2 Add-in Board and Peripheral Interface Connectors..................................63
14. D845EPT2 Add-in Board and Peripheral Interface Connectors ..................................64
15. External I/O Connectors.............................................................................................70
16. Location of the Jumper Blocks....................................................................................74
17. Desktop Board D845EBG2 Dimensions .....................................................................76
18. Desktop Board D845EPT2 Dimensions......................................................................77
19. I/O Shield Dimensions (for Desktop Boards with the LAN Subsystem).......................78
20. I/O Shield Dimensions (for Desktop Boards with no LAN Subsystem)........................79
21. Localized High Temperature Zones............................................................................84
Tables
1. Summary of Board Differences...................................................................................11
2. Feature Summary.......................................................................................................12
3. Manufacturing Options ...............................................................................................13
4. Specifications .............................................................................................................18
5. Supported Memory Configurations.............................................................................23
6. LAN Connector LED States........................................................................................32
7. Effects of Pressing the Power Switch.........................................................................38
8. Power States and Targeted System Power................................................................39
9. Wake-up Devices and Events.....................................................................................40
10. Fan Connector Function/Operation for Desktop Boards with a Hardware
Monitoring ASIC .........................................................................................................41
11. Fan Connector Function/Operation for Desktop Boards with a Hardware
Monitoring and Fan Control ASIC...............................................................................42
12. System Memory Map..................................................................................................47
13. I/O Map ......................................................................................................................48
14. DMA Channels ...........................................................................................................49
15. PCI Configuration Space Map....................................................................................49
16. Interrupts....................................................................................................................50
17. PCI Interrupt Routing Map..........................................................................................52
18. PS/2 Mouse/Keyboard Connector ..............................................................................55
19. USB Connectors.........................................................................................................55
20. Parallel Port Connector...............................................................................................55
21. Serial Port A Connector..............................................................................................56
22. LAN Connector (Optional) ..........................................................................................56
23. Audio Line In Connector (Optional).............................................................................56
24. Audio Line Out Connector (Optional)..........................................................................56
25. Mic In Connector (Optional)........................................................................................56
26. Auxiliary Line In Connector.........................................................................................59
27. ATAPI CD-ROM Connector........................................................................................59
28. ATX12V Power Connector..........................................................................................61
29. Rear Chassis Fan Connector .....................................................................................61
30. Processor Fan Connector...........................................................................................61
31. Main Power Connector...............................................................................................62

Contents
ix
32. Front Chassis Fan Connector.....................................................................................62
33. Chassis Intrusion Connector.......................................................................................62
34. CNR Connector (Optional)..........................................................................................65
35. PCI Bus Connectors...................................................................................................66
36. AGP Connector ..........................................................................................................67
37. Diskette Drive Connector............................................................................................68
38. PCI IDE Connectors...................................................................................................69
39. SCSI LED Connector..................................................................................................69
40. Front Panel Audio Connector .....................................................................................71
41. Serial Port B Connector..............................................................................................71
42. Front Panel USB Connector.......................................................................................71
43. Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector........................71
44. Front Panel Connector ...............................................................................................72
45. States for a One-Color Power LED.............................................................................72
46. States for a Two-Color Power LED.............................................................................73
47. Front Panel Audio Connector/Jumper Block...............................................................75
48. BIOS Setup Configuration Jumper Settings................................................................75
49. Power Usage..............................................................................................................80
50. Standby Current Requirements..................................................................................81
51. Fan Connector Current Capability ..............................................................................82
52. Thermal Considerations for Components ...................................................................84
53. Desktop Board D845EBG2/D845EPT2 Environmental Specifications........................85
54. Safety Regulations .....................................................................................................86
55. EMC Regulations........................................................................................................86
56. Supervisor and User Password Functions..................................................................96
57. BIOS Setup Program Menu Bar .................................................................................97
58. BIOS Setup Program Function Keys ..........................................................................98
59. Maintenance Menu.....................................................................................................98
60. Main Menu..................................................................................................................99
61. Advanced Menu........................................................................................................100
62. PCI Configuration Submenu.....................................................................................101
63. Boot Configuration Submenu....................................................................................102
64. Peripheral Configuration Submenu...........................................................................103
65. IDE Configuration Submenu.....................................................................................105
66. Primary/Secondary IDE Master/Slave Submenus.....................................................106
67. Diskette Configuration Submenu..............................................................................108
68. Event Log Configuration Submenu...........................................................................109
69. Video Configuration Submenu..................................................................................110
70. USB Configuration Submenu....................................................................................111
71. Chipset Configuration Submenu...............................................................................112
72. Security Menu ..........................................................................................................113
73. Power Menu.............................................................................................................114
74. ACPI Submenu.........................................................................................................114
75. Boot Menu................................................................................................................115
76. Boot Device Priority Submenu..................................................................................116
77. Hard Disk Drives Submenu ......................................................................................117
78. Removable Devices Submenu..................................................................................117
79. ATAPI CD-ROM Drives Submenu............................................................................118

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
x
80. Exit Menu .................................................................................................................118
81. BIOS Error Messages...............................................................................................119
82. Uncompressed INIT Code Checkpoints....................................................................121
83. Boot Block Recovery Code Checkpoints ..................................................................121
84. Runtime Code Uncompressed in F000 Shadow RAM ..............................................122
85. Bus Initialization Checkpoints...................................................................................125
86. Upper Nibble High Byte Functions............................................................................125
87. Lower Nibble High Byte Functions............................................................................126
88. Beep Codes..............................................................................................................127

11
1 Product Description
What This Chapter Contains
1.1 Board Differences.......................................................................................................11
1.2 Overview ....................................................................................................................12
1.3 Online Support ...........................................................................................................17
1.4 Operating System Support .........................................................................................17
1.5 Design Specifications .................................................................................................18
1.6 Processor...................................................................................................................21
1.7 System Memory .........................................................................................................22
1.8 Intel®845E Chipset ....................................................................................................24
1.9 I/O Controller..............................................................................................................28
1.10 Audio Subsystem (Optional).......................................................................................30
1.11 LAN Subsystem (Optional).........................................................................................32
1.12 CNR (Optional)...........................................................................................................33
1.13 Hardware Management Subsystem............................................................................34
1.14 Power Management ...................................................................................................37
1.1 Board Differences
This TPS describes these Intel®Desktop Boards: D845EBG2 and D845EPT2. The Desktop
Boards are identical with the exception of the items listed in Table 1.
Table 1. Summary of Board Differences
D845EBG2 • ATX Form Factor (12.00 inches by 8.20 inches)
• Six PCI bus connectors
D845EPT2 • microATX Form Factor (9.60 inches by 8.20 inches)
• Three PCI bus connectors
✏ NOTE
Most of the illustrations in this document show only the Desktop Board D845EPT2. When there
are significant differences between the two Desktop Boards, illustrations of both boards are
provided.

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
12
1.2 Overview
1.2.1 Feature Summary
Table 2 summarizes the major features of the Desktop Boards D845EBG2 and D845EPT2.
Table 2. Feature Summary
Form Factor D845EBG2: ATX (12.00 inches by 8.20 inches)
D845EPT2: microATX (9.60 inches by 8.20 inches)
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
Memory • Two 184-pin DDR SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for single-sided or double-sided DIMMs (DDR 200 and DDR 266)
• Support for up to 2 GB system memory
NOTE: The Desktop Boards D845EBG2/D845EPT2 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.
Please refer to the following Intel web sites.
For the Desktop Board D845EBG2:
http://developer.intel.com/design/motherbd/bg2/bg2_mem.htm
For the Desktop Board D845EPT2:
http://developer.intel.com/design/motherbd/pt2/pt2_mem.htm
Chipset Intel®845E Chipset, consisting of:
• Intel®82845E Memory Controller Hub (MCH)
• Intel®82801DB I/O Controller Hub (ICH4)
• 4 Mbit Firmware Hub (FWH)
Video AGP connector supporting 1.5 V 4X AGP cards
I/O Control SMSC LPC47M102 LPC Bus I/O controller
USB Support for USB 2.0 devices through up to six USB ports.
Peripheral
Interfaces
• Up to six USB ports
• Two serial ports
• 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
Expansion
Capabilities
• D845EBG2: Six PCI bus add-in card connectors (SMBus routed to PCI bus
connector 1)
• D845EPT2: Three PCI bus add-in card connectors (SMBus routed to PCI bus
connector 1)
continued

Product Description
13
Table 2. Feature Summary (continued)
BIOS • Intel/AMI BIOS (resident in the 4 Mbit FWH)
• Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
and SMBIOS
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 1.5, page 18
1.2.2 Manufacturing Options
Table 3 describes the manufacturing options on the Desktop Boards D845EBG2 and D845EPT2.
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
Audio Audio subsystem for AC ‘97 processing using the Analog Devices AD1981A codec
CNR One Communication and Networking Riser (CNR) connector (slot shared with
PCI bus connector 6 on the Desktop Board D845EBG2 and with PCI bus connector 3
on the Desktop Board D845EPT2)
Hardware Monitor
Subsystem
• 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
• Hardware monitoring ASIC
LAN Intel®82562ET 10/100 Mbit/sec Platform LAN Connect (PLC) device
For information about Refer to
Available configurations for the Desktop Boards D845EBG2 and D845EPT2 Section 1.3, page 17
✏ NOTE
The LAN and the CNR manufacturing options are mutually exclusive.

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
14
1.2.3 Board Layouts
Figure 1 shows the location of the major components on the Desktop Board D845EBG2.
OM14226
D
G
F
E
J
NKM
CA
I
S
H
Q
O
L
B
P
R
A Audio codec (optional) K IDE connectors
B Intel 82562ET PLC device (optional) L Diskette drive connector
C AGP connector M 4 Mbit Firmware Hub (FWH)
D Back panel connectors N Speaker
E +12 V power connector (ATX12V) O Front panel connector
F Intel 82845E Memory Controller Hub (MCH) P Intel 82801DB I/O Controller Hub (ICH4)
G µPGA478 processor socket Q Battery
H DIMM sockets R PCI bus add-in card connectors
I I/O controller S CNR connector (optional)
J Power connector
Figure 1. Desktop Board D845EBG2 Components

Product Description
15
Figure 2 shows the location of the major components on the Desktop Board D845EPT2.
OM14236
AB C D
E
F
G
H
I
J
K
LM
N
O
P
Q
R
S
A Audio codec (optional) K IDE connectors
B Intel 82562ET PLC device (optional) L Diskette drive connector
C AGP connector M 4 Mbit Firmware Hub (FWH)
D Back panel connectors N Speaker
E +12 V power connector (ATX12V) O Front panel connector
F Intel 82845E Memory Controller Hub (MCH) P Intel 82801DB I/O Controller Hub (ICH4)
G µPGA478 processor socket Q Battery
H DIMM sockets R PCI bus add-in card connectors
I I/O controller S CNR connector (optional)
J Power connector
Figure 2. Desktop Board D845EPT2 Components

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
16
1.2.4 Block Diagram
Figure 3 is a block diagram of the major functional areas of the Desktop Boards D845EBG2 and
D845EPT2. See Figure 5 on page 26 for USB port routing.
Intel 845E Chipset
Intel 82801DB
I/O Controller Hub
(ICH4)
Intel 82845E
Memory Controller
Hub (MCH)
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 Ports
UDMA 33 and
ATA-66/100
LPC
Bus
Hardware
Management
ASIC
OM14258
AD1981A
Audio Codec
(Optional) Auxiliary Line In
Mic In (Optional)
Line Out (Optional)
CD-ROM
Line In (Optional)
CNR
Connector
(Optional)
LAN
Connector
(Optional)
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
Memory Bus
SMBus
SMBus
D845EBG2
Only
PCI Slot 1
PCI Slot 2
PCI Slot 3
PCI Slot 4
PCI Slot 5
PCI Slot 6
Figure 3. Block Diagram

Product Description
17
1.3 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Boards D845EBG2 and
D845EPT2 under “Desktop Board
Products”or “Desktop Board Support”
http://www.intel.com/design/motherbd
http://support.intel.com/support/motherboards/desktop
Available configurations for the Desktop
Board D845EBG2 http://developer.intel.com/design/motherbd/bg2/bg2_available.htm
Available configurations for the Desktop
Board D845EPT2 http://developer.intel.com/design/motherbd/pt2/pt2_available.htm
Processor data sheets http://www.intel.com/design/litcentr
ICH4 addressing http://developer.intel.com/design/chipsets/datashts
Custom splash screens http://intel.com/design/motherbd/gen_indx.htm
Audio software and utilities http://www.intel.com/design/motherbd
LAN software and drivers http://www.intel.com/design/motherbd
1.4 Operating System Support
The Desktop Boards D845EBG2 and D845EPT2 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 1.3
✏ 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.

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
18
1.5 Design Specifications
Table 4 lists the specifications applicable to the Desktop Boards D845EBG2 and D845EPT2.
Table 4. 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 2.0,
July 27, 2000,
Compaq Computer
Corporation,
Intel Corporation,
Microsoft Corporation,
Phoenix Technologies
Limited, and
Toshiba Corporation.
http://www.acpi.info/spec.htm
AGP Accelerated Graphics Port
Interface Specification
Revision 2.0,
May 4, 1998,
Intel Corporation.
http://www.agpforum.org/
specs_specs.htm
AMI BIOS AMIBIOS Desktop Core 8.0 AMIBIOS 8.0,
2001,
American Megatrends, Inc.
http://www.ami.com/support/
doc/amibios8.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 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

Product Description
19
Table 4. Specifications (continued)
Reference
Name
Specification
Title
Version, Revision Date and
Ownership
The information is
available from…
DDR
SDRAM 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
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
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/tech/PnP/
default.asp
continued

Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification
20
Table 4. Specifications (continued)
Reference
Name
Specification
Title
Version, Revision Date
and Ownership
The information is
available from…
PXE Preboot Execution
Environment
Version 2.1,
September 20, 1999,
Intel Corporation.
ftp://download.intel.com/ial/
wfm/pxespec.pdf
SFX SFX/SFX12V Power
Supply Design Guide
Version 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
UHCI Universal Host Controller
Interface Design Guide
Revision 1.1,
March 1996,
Intel 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