INTEL D845EBT Technical Product Specification

Intel® Desktop Board D845EBT

Technical Product Specification

May 2002

Order Number: A92200-001

The Intel® Desktop Board D845EBT 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 D845EBT Specification Update.

Revision History

Revision	Revision History	Date
	First release of the Intel Desktop Board D845EBT Technical Product
-001		May 2002
	Specification.

This product specification applies to only the standard Intel Desktop Board D845EBT with BIOS identifier BT84510A.86A.

Changes to this specification will be published in the Intel Desktop Board D845EBT 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 Board D845EBT 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.

Preface

This Technical Product Specification (TPS) specifies the Intel Desktop Board D845EBT layout, components, connectors, power and environmental requirements, and BIOS. The TPS describes the standard product and available manufacturing options.

Intended Audience

The TPS is intended to provide detailed, technical information about the Desktop Board D845EBT and its 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

1A description of the hardware used on the Desktop Board D845EBT

2A map of the resources of the Desktop Board D845EBT

3The features supported by the BIOS Setup program

4The contents of the BIOS Setup program’s menus and submenus

5A 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.

iii

Intel Desktop Board D845EBT Technical Product Specification

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 Board D845EBT, 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)
Mbits/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.

iv

Contents

1 Product Description

1.1	Overview ....................................................................................................................		12
	1.1.1	Feature Summary ........................................................................................	12
	1.1.2	Manufacturing Options .................................................................................	13
	1.1.3	Board Layout................................................................................................	14
	1.1.4	Block Diagram..............................................................................................	15
1.2	Online Support ...........................................................................................................		16
1.3	Operating System Support .........................................................................................		16
1.4	Design Specifications .................................................................................................		17
1.5	Processor ...................................................................................................................		20
1.6	System Memory .........................................................................................................		21
1.7	Intel® 845E Chipset ....................................................................................................		23
	1.7.1	AGP .............................................................................................................	24
	1.7.2	USB..............................................................................................................	24
	1.7.3	IDE Support .................................................................................................	25
	1.7.4	Real-Time Clock, CMOS SRAM, and Battery...............................................	26
	1.7.5	4 Mbit Firmware Hub (FWH) ........................................................................	26
1.8	IDE RAID Controller ...................................................................................................		27
1.9	I/O Controller ..............................................................................................................		27
	1.9.1	Serial Ports ..................................................................................................	27
	1.9.2	Parallel Port..................................................................................................	28
	1.9.3	Diskette Drive Controller ..............................................................................	28
	1.9.4	Keyboard and Mouse Interface ....................................................................	28
1.10 IEEE 1394a-2000 Controller .......................................................................................			29
1.11 Audio Subsystem........................................................................................................			29
	1.11.1	6-Channel Audio Subsystem (Optional) .......................................................	30
	1.11.2	2-Channel Audio Subsystem (Optional) .......................................................	31
	1.11.3	Audio Connectors.........................................................................................	32
	1.11.4	Audio Subsystem Software ..........................................................................	32
1.12 LAN Subsystem..........................................................................................................			33
	1.12.1	Intel® 82562ET Platform LAN Connect Device .............................................	33
	1.12.2	RJ-45 LAN Connector with Integrated LEDs ................................................	33
	1.12.3	LAN Subsystem Software ............................................................................	34
1.13 CNR (Optional) ...........................................................................................................			34
1.14 Hardware Management Subsystem............................................................................			35
	1.14.2	Fan Monitoring .............................................................................................	37
	1.14.3	Chassis Intrusion and Detection...................................................................	38
1.15 Power Management ...................................................................................................			38
	1.15.1	ACPI.............................................................................................................	39
	1.15.2	Hardware Support ........................................................................................	42

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Intel Desktop Board D845EBT Technical Product Specification

2 Technical 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 ................................................................................	58
	2.8.3	External I/O Connectors ...............................................................................	69
2.9	Jumper Blocks............................................................................................................		73
	2.9.1	Front Panel Audio Connector/Jumper Block.................................................	73
	2.9.2	BIOS Setup Configuration Jumper Block......................................................	74
2.10	Mechanical Considerations.........................................................................................		75
	2.10.1	D845EBT Form Factor .................................................................................	75
	2.10.2	I/O Shield .....................................................................................................	76
2.11	Electrical Considerations ............................................................................................		78
	2.11.1	Power Consumption .....................................................................................	78
	2.11.2	Add-in Board Considerations........................................................................	78
	2.11.3	Standby Current Requirements ....................................................................	79
	2.11.4	Fan Connector Current Capability ................................................................	80
	2.11.5	Power Supply Considerations ......................................................................	81
2.12	Thermal Considerations..............................................................................................		82
2.13	Reliability ....................................................................................................................		83
2.14	Environmental ............................................................................................................		84
2.15	Regulatory Compliance ..............................................................................................		85
	2.15.1	Safety Regulations .......................................................................................	85
	2.15.2	EMC Regulations .........................................................................................	85
	2.15.3	Product Certification Markings (Board Level) ...............................................	86

3 Overview of BIOS Features

3.1	Introduction.................................................................................................................		87
3.2	BIOS Flash Memory Organization ..............................................................................		88
3.3	Resource Configuration ..............................................................................................		88
	3.3.1	PCI Autoconfiguration ..................................................................................	88
	3.3.2	PCI IDE Support...........................................................................................	88
3.4	System Management BIOS (SMBIOS) .......................................................................		89
3.5	Legacy USB Support ..................................................................................................		89
3.6	BIOS Updates ............................................................................................................		90
	3.6.1	Language Support........................................................................................	90
	3.6.2	Custom Splash Screen.................................................................................	90
3.7	Recovering BIOS Data ...............................................................................................		91

vi

Contents

3.8	Boot Options...............................................................................................................		91
	3.8.1	CD-ROM Boot ..............................................................................................	91
	3.8.2	Network Boot................................................................................................	92
	3.8.3	Booting Without Attached Devices ...............................................................	92
3.9	Changing the Default Boot Device During POST........................................................		92
3.10	Fast Booting Systems with Intel® Rapid BIOS Boot ....................................................		93
	3.10.1	Peripheral Selection and Configuration ........................................................	93
	3.10.2	Intel Rapid BIOS Boot ..................................................................................	93
3.11	BIOS Security Features..............................................................................................		94

4 BIOS Setup Program

4.1	Introduction.................................................................................................................		95
4.2	Maintenance Menu .....................................................................................................		96
4.3	Main Menu..................................................................................................................		97
4.4	Advanced Menu..........................................................................................................		98
	4.4.1	PCI Configuration Submenu.........................................................................	99
	4.4.2	Boot Configuration Submenu .....................................................................	100
	4.4.3	Peripheral Configuration Submenu.............................................................	101
	4.4.4	IDE Configuration Submenu.......................................................................	103
	4.4.5	Diskette Configuration Submenu................................................................	106
	4.4.6	Event Log Configuration Submenu.............................................................	107
	4.4.7	Video Configuration Submenu....................................................................	108
	4.4.8	USB Configuration Submenu .....................................................................	109
	4.4.9	Chipset Configuration Submenu.................................................................	110
4.5	Security Menu ..........................................................................................................		111
4.6	Power Menu .............................................................................................................		112
	4.6.1	ACPI Submenu ..........................................................................................	112
4.7	Boot Menu ................................................................................................................		113
	4.7.1	Boot Device Priority Submenu....................................................................	114
	4.7.2	Hard Disk Drives Submenu ........................................................................	115
	4.7.3	Removable Devices Submenu ...................................................................	115
	4.7.4	ATAPI CD-ROM Drives Submenu ..............................................................	116
4.8	Exit Menu .................................................................................................................		116

5 Error Messages and Beep Codes

5.1	BIOS Error Messages...............................................................................................	117
5.2	Port 80h POST Codes..............................................................................................	119
5.3	Bus Initialization Checkpoints ...................................................................................	123
5.4	Speaker ...................................................................................................................	124
5.5	BIOS Beep Codes ....................................................................................................	124

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Intel Desktop Board D845EBT Technical Product Specification

Figures
1.	Desktop Board D845EBT Components ......................................................................	14
2.	Block Diagram ............................................................................................................	15
3.	Intel 845E Chipset Block Diagram ..............................................................................	23
4.	USB Port Configuration ..............................................................................................	24
5.	6-Channel Audio Subsystem Block Diagram ..............................................................	30
6.	2-Channel Audio Subsystem Block Diagram ..............................................................	31
7.	ICH4 and CNR Signal Interface ..................................................................................	34
8.	Thermal Monitoring.....................................................................................................	37
9.	Location of the Standby Power Indicator LED ............................................................	45
10.	Back Panel Connectors ..............................................................................................	54
11.	Power and Hardware Control Connectors ..................................................................	59
12.	D845EBT Add-in Board and Peripheral Interface Connectors ....................................	62
13.	External I/O Connectors .............................................................................................	69
14.	Location of the Jumper Blocks....................................................................................	73
15.	Desktop Board D845EBT Dimensions ........................................................................	75
16.	I/O Shield Dimensions (for Boards with the 6-Channel Audio Subsystem) .................	76
17.	I/O Shield Dimensions (for Boards with the 2-Channel Audio Subsystem) .................	77
18.	Localized High Temperature Zones............................................................................	82
Tables
1.	Feature Summary.......................................................................................................	12
2.	Manufacturing Options ...............................................................................................	13
3.	Specifications .............................................................................................................	17
4.	Supported Memory Configurations .............................................................................	22
5.	LAN Connector LED States ........................................................................................	33
6.	Effects of Pressing the Power Switch .........................................................................	39
7.	Power States and Targeted System Power ................................................................	40
8.	Wake-up Devices and Events.....................................................................................	41
9.	Fan Connector Function/Operation.............................................................................	43
10.	System Memory Map..................................................................................................	47
11.	I/O Map ......................................................................................................................	48
12.	DMA Channels ...........................................................................................................	49
13.	PCI Configuration Space Map ....................................................................................	49
14.	Interrupts ....................................................................................................................	50
15.	PCI Interrupt Routing Map ..........................................................................................	52
16.	PS/2 Mouse/Keyboard Connector ..............................................................................	55
17.	IEEE 1394a-2000 Connector ......................................................................................	55
18.	USB Connectors.........................................................................................................	55
19.	Serial Port A Connector ..............................................................................................	55
20.	Parallel Port Connector...............................................................................................	56
21.	S/PDIF Connector (Optional)......................................................................................	56
22.	Audio Rear Out Connector (Optional).........................................................................	56
23.	Audio Center/LFE Out Connector (Optional) ..............................................................	56
24.	Audio Line In Connector .............................................................................................	57
25.	Audio Line Out Connector (Front Out for 6-Channel Audio)........................................	57

viii

Contents

26.	Mic In Connector ........................................................................................................	57
27.	LAN Connector ...........................................................................................................	57
28.	ATX12V Power Connector..........................................................................................	60
29.	Rear Chassis Fan Connector .....................................................................................	60
30.	Processor Fan Connector...........................................................................................	60
31.	Main Power Connector ...............................................................................................	60
32.	Chassis Intrusion Connector.......................................................................................	61
33.	Front Chassis Fan Connector .....................................................................................	61
34.	CNR Connector (Optional)..........................................................................................	63
35.	PCI Bus Connectors ...................................................................................................	64
36.	AGP Connector ..........................................................................................................	65
37.	ATAPI-Style CD-ROM Connector ...............................................................................	66
38.	Diskette Drive Connector............................................................................................	66
39.	PCI IDE Connectors ...................................................................................................	67
40.	SCSI LED Connector..................................................................................................	67
41.	IDE RAID Connectors.................................................................................................	68
42.	Front Panel Audio Connector .....................................................................................	70
43.	Serial Port B Connector ..............................................................................................	70
44.	Front Panel USB Connector .......................................................................................	70
45.	Front Panel IEEE 1394a-2000 Connectors.................................................................	71
46.	Front Panel Connector ...............................................................................................	71
47.	States for a One-Color Power LED.............................................................................	72
48.	States for a Two-Color Power LED.............................................................................	72
49.	Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector ........................	72
50.	Front Panel Audio Connector/Jumper Block ...............................................................	74
51.	BIOS Setup Configuration Jumper Settings................................................................	74
52.	Power Usage..............................................................................................................	78
53.	Standby Current Requirements ..................................................................................	79
54.	Fan Connector Current Capability ..............................................................................	80
55.	Thermal Considerations for Components ...................................................................	83
56.	Desktop Board D845EBT Environmental Specifications .............................................	84
57.	Safety Regulations .....................................................................................................	85
58.	EMC Regulations........................................................................................................	85
59.	Boot Device Menu Options .........................................................................................	92
60.	Supervisor and User Password Functions ..................................................................	94
61.	BIOS Setup Program Menu Bar .................................................................................	95
62.	BIOS Setup Program Function Keys ..........................................................................	96
63.	Maintenance Menu .....................................................................................................	96
64.	Main Menu..................................................................................................................	97
65.	Advanced Menu..........................................................................................................	98
66.	PCI Configuration Submenu .......................................................................................	99
67.	Boot Configuration Submenu....................................................................................	100
68.	Peripheral Configuration Submenu...........................................................................	101
69.	IDE Configuration Submenu .....................................................................................	103
70.	Primary/Secondary IDE Master/Slave Submenus.....................................................	104
71.	Diskette Configuration Submenu ..............................................................................	106
72.	Event Log Configuration Submenu ...........................................................................	107
73.	Video Configuration Submenu ..................................................................................	108

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Intel Desktop Board D845EBT Technical Product Specification

74.	USB Configuration Submenu....................................................................................	109
75.	Chipset Configuration Submenu ...............................................................................	110
76.	Security Menu ..........................................................................................................	111
77.	Power Menu .............................................................................................................	112
78.	ACPI Submenu.........................................................................................................	112
79.	Boot Menu ................................................................................................................	113
80.	Boot Device Priority Submenu ..................................................................................	114
81.	Hard Disk Drives Submenu ......................................................................................	115
82.	Removable Devices Submenu..................................................................................	115
83.	ATAPI CD-ROM Drives Submenu ............................................................................	116
84.	Exit Menu .................................................................................................................	116
85.	BIOS Error Messages...............................................................................................	117
86.	Uncompressed INIT Code Checkpoints....................................................................	119
87.	Boot Block Recovery Code Checkpoints ..................................................................	119
88.	Runtime Code Uncompressed in F000 Shadow RAM ..............................................	120
89.	Bus Initialization Checkpoints ...................................................................................	123
90.	Upper Nibble High Byte Functions............................................................................	123
91.	Lower Nibble High Byte Functions............................................................................	124
92.	Beep Codes..............................................................................................................	125

x

1 Product Description

What This Chapter Contains
1.1	Overview ....................................................................................................................	12
1.2	Online Support ...........................................................................................................	16
1.3	Operating System Support .........................................................................................	16
1.4	Design Specifications .................................................................................................	17
1.5	Processor ...................................................................................................................	20
1.6	System Memory .........................................................................................................	21
1.7	Intel® 845E Chipset ....................................................................................................	23
1.8	IDE RAID Controller ...................................................................................................	27
1.9	I/O Controller ..............................................................................................................	27
1.10	IEEE 1394a-2000 Controller .......................................................................................	29
1.11	Audio Subsystem........................................................................................................	29
1.12	LAN Subsystem..........................................................................................................	33
1.13	CNR (Optional) ...........................................................................................................	34
1.14	Hardware Management Subsystem............................................................................	35
1.15	Power Management ...................................................................................................	38

11

Intel Desktop Board D845EBT Technical Product Specification

1.1 Overview

1.1.1Feature Summary

Table 1 summarizes the major features of the Intel® Desktop Board D845EBT.

Table 1. Feature Summary

Form Factor

Processor

Memory

Chipset

Video

Audio

USB

Peripheral

Interfaces

IEEE 1394a-2000

IDE RAID

Expansion

Capabilities

I/O Control

LAN

ATX (12.00 inches by 8.20 inches)

•Support for an Intel® Pentium® 4 processor in a PGA478 socket with a 400/533 MHz system bus

•Support for an Intel® Celeron® processor in a PGA478 socket with a 400 MHz system bus

•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 of system memory

NOTE: The Desktop Board D845EBT has 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 site: http://developer.intel.com/design/motherbd/bt/bt_mem.htm

Intel® 845E Chipset, consisting of:

•Intel® 82845E Memory Controller Hub (MCH)

•Intel® 82801DB I/O Controller Hub (ICH4)

•4 Mbit Firmware Hub (FWH)

AGP connector supporting 1.5 V 4X AGP cards

See Manufacturing Options on page 13.

Support for USB 2.0 devices

•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

•Agere Systems FW323 controller

•Three IEEE 1394a-2000 ports

•Promise† Technology PDC20267 ATA/100 controller supporting RAID 0, RAID 1, and RAID 0+1

•Two IDE RAID connectors

Five PCI bus add-in card connectors (SMBus routed to PCI bus connector 1)

SMSC LPC47M102 LPC Bus I/O controller

Intel® 82562ET 10/100 Mbits/sec Platform LAN Connect (PLC) device

continued

12

Product Description

Table 1. Feature Summary (continued)

Hardware Monitor

Subsystem

BIOS

•Hardware management ASIC

•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

•Intel/AMI BIOS (resident in the 4 Mbit FWH)

•Support for Advanced Configuration and Power Interface (ACPI), Plug and Play, and SMBIOS

Instantly Available • Support for PCI Local Bus Specification Revision 2.2 PC Technology • Suspend to RAM support

• Wake on PCI, CNR, RS-232, front panel, PS/2 devices, and USB ports

For information about	Refer to
The Desktop Board D845EBT’s compliance level with ACPI,	Section 1.4, page 17
Plug and Play, and SMBIOS.

1.1.2Manufacturing Options

Table 2 describes the manufacturing options for the Desktop Board D845EBT. 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 2. Manufacturing Options

Audio

CNR

The Desktop Board D845EBT includes either of the following audio subsystems for AC ’97 processing:

•6-channel audio subsystem using the Analog Devices AD1980 codec

•2-channel audio subsystem using the Analog Devices AD1981A codec Communication and Networking Riser (CNR) connector.

NOTE: LAN and USB CNR cards are not supported.

For information about	Refer to
Available configurations for the Desktop Board D845EBT	Section 1.2, page 16

13

Intel Desktop Board D845EBT Technical Product Specification

1.1.3Board Layout

Figure 1 shows the location of the major components on the Desktop Board D845EBT.

A		B		C		D
						E
V						F
U						G
T
S
R						H
Q						I
P	O	N	M	L	K	J
						OM14388

AAudio codec

BIntel 82562ET PLC device

CAGP connector

DBack panel connectors

E+12 V power connector (ATX12V)

FIntel 82845E Memory Controller Hub (MCH)

GPGA478 processor socket

HDIMM sockets

II/O controller

JPower connector

KIDE connectors

LDiskette drive connector

M4 Mbit Firmware Hub (FWH)

NIntel 82801DB I/O Controller Hub (ICH4)

OSpeaker

PFront panel connector

QRAID connectors

RRAID controller

SBattery

TPCI bus add-in card connectors

UIEEE 1394a-2000 controller

VCNR connector (optional)

Figure 1. Desktop Board D845EBT Components

14

Product Description

1.1.4Block Diagram

Figure 2 is a block diagram of the major functional areas of the Desktop Board D845EBT. See Figure 4 on page 24 for USB port routing.

= connector or socket

Back Panel/

Front Panel

USB Ports

USB

Serial Ports

LPC Bus

Parallel Port

Primary/

UDMA 33 and

I/O

PS/2 Mouse

Secondary IDE

ATA-66/100

Controller

PS/2 Keyboard

PGA478

System Bus

Diskette Drive

Connector

Processor Socket

(400/533 MHz)

			LPC
			Bus
AGP			Intel 82801DB			4 Mbit
Interface	Intel 82845E	AHA
	Memory Controller		I/O Controller Hub			Firmware Hub
		Bus
4X AGP	Hub (MCH)		(ICH4)			(FWH)
Connector
(1.5 V only)					Intel 845E Chipset
			CSMA/CD
DIMM Banks (2)	Memory Bus		Unit Interface	Physical
						LAN
	SMBus				Layer
						Connector
				Interface
Primary/	PD20267
Secondary	RAID
RAID	Controller
			AC Link			CNR
	FWE323					Connector
IEEE 1394a-2000	IEEE 1394a-2000		SMBus			(Optional)
Ports (3)	Controller
	PCI Bus					Front Out
					Center/LFE Out
			AD1980			Rear Out
PCI Slot 1	SMBus		Audio Codec			S/PDIF
			(Optional)			Line In
PCI Slot 2
						Mic In
PCI Slot 3						CD-ROM
PCI Slot 4		Hardware
		Monitoring				Line Out
PCI Slot 5		and Fan
		Control ASIC	AD1981A			Line In
			Audio Codec			Mic In
			(Optional)
						CD-ROM
						OM14467

Figure 2. Block Diagram

15

Intel Desktop Board D845EBT Technical Product Specification

1.2 Online Support

To find information about…

The Desktop Board D845EBT, look under “Desktop Board Products” or “Desktop Board Support”

Available configurations for the Desktop Board D845EBT

Processor data sheets

ICH4 addressing

Custom splash screens

Audio software and utilities

LAN software and drivers

Visit this World Wide Web site:

http://www.intel.com/design/motherbd

http://support.intel.com/support/motherboards/desktop

http://developer.intel.com/design/motherbd/bt/bt_available.htm

http://www.intel.com/design/litcentr

http://developer.intel.com/design/chipsets/datashts

http://intel.com/design/motherbd/gen_indx.htm

http://www.intel.com/design/motherbd

http://www.intel.com/design/motherbd

1.3 Operating System Support

The Desktop Board D845EBT supports drivers for all of the onboard hardware and subsystems under the following operating systems:

•Microsoft Windows† 98 SE

•Windows ME

•Windows 2000

•Windows XP

For information about

Supported drivers

Refer to

Section 1.2, page 16

NOTES

•Third party vendors may offer other drivers.

•IEEE 1394a-2000 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system.

•USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system.

16

Product Description

1.4 Design Specifications

Table 3 lists the specifications applicable to the Desktop Board D845EBT.

Table 3. Specifications

Reference

Name

1394

AC ’97

ACPI

AGP

AMI BIOS

ATA/ ATAPI-5

ATX

ATX12V

BIS

CNR

Specification	Version, Revision Date,	The information is
Title	and Ownership	available from…
IEEE Std 1394-1995,	November 8, 2001	http://standards.ieee.org/
IEEE Standard for a High	Institute of Electrical and	catalog/olis/busarch.html
Performance Serial Bus	Electronic Engineers.
IEEE Std 1394a-2000,	June 29, 2000	http://standards.ieee.org/
IEEE Standard for a High	Institute of Electrical and	catalog/olis/busarch.html
Performance Serial Bus –	Electronic Engineers.
Amendment 1
Audio Codec ’97	Revision 2.2,	ftp://download.intel.com/ial/
	September 2000,	scalableplatforms/
	Intel Corporation.	ac97r22.pdf
Advanced Configuration	Version 2.0,	http://www.acpi.info/spec.htm
and Power Interface	July 27, 2000,
Specification	Compaq Computer
	Corporation,
	Intel Corporation,
	Microsoft Corporation,
	Phoenix Technologies
	Limited, and
	Toshiba Corporation.
Accelerated Graphics Port	Revision 2.0,	http://www.agpforum.org/
Interface Specification	May 4, 1998,	specs_specs.htm
	Intel Corporation.
AMIBIOS Desktop Core 8.0	AMIBIOS 8.0,	http://www.ami.com/support/
	2001,	doc/amibios8.pdf
	American Megatrends, Inc.
Information Technology-AT	Revision 3,	http://www.t13.org
Attachment with Packet	February 29, 2000,
Interface - 5	Contact: T13 Chair,
(ATA/ATAPI-5)	Seagate Technology.
ATX Specification	Version 2.03,	http://www.formfactors.org/
	December 1998,	developer/specs/atx/
	Intel Corporation.	atxspecs.htm
ATX/ATX12V Power	Version 1.2,	http://www.formfactors.org/
Supply Design Guide	August 2000,	developer/specs/atx/
	Intel Corporation.	atxspecs.htm
Boot Integrity Services	Version 1.0,	http://www.intel.com/labs/
(BIS) Application	August 4, 1999,	manage/wfm/wfmspecs.htm
Programming Interface	Intel Corporation.
(API)
Communication and	Revision 1.2,	http://developer.intel.com/
Network Riser (CNR)	November 8, 2001,	technology/cnr/index.htm
Specification	Intel Corporation.

continued

17

Intel Desktop Board D845EBT Technical Product Specification

Table 3.	Specifications (continued)
Reference		Specification	Version, Revision Date and	The information is
Name		Title	Ownership	available from…
DDR		Double Data Rate (DDR)	Version 1.0,	http://www.jedec.org/
SDRAM		SDRAM Specification	June 2000,
			JEDEC Solid State Technology
			Association.
		Design Specification for	Revision 1.0,	http://www.jedec.org/
		a 184 Pin DDR	October 2001,
		Unbuffered DIMM	JEDEC Solid State Technology
			Association.
		Intel® JEDEC DDR	Revision 0.9,	http://developer.intel.com/
		200/266 Unbuffered	September 27, 2001,	technology/memory/
		DIMM Specification	Intel Corporation.	index.htm
		Addendum
EHCI		Enhanced Host	Revision 1.0,	http://developer.intel.com/
		Controller Interface	March 12, 2002,	technology/usb/download/
		Specification for	Intel Corporation.	ehci-r10.pdf
		Universal Serial Bus
EPP		IEEE Std 1284.1-1997	Version 1.7, 1997,	http://standards.ieee.org/
		(Enhanced Parallel Port)	Institute of Electrical and	reading/ieee/std_public/
			Electronic Engineers.	description/busarch/
				1284.1-1997_desc.html
El Torito		Bootable CD-ROM	Version 1.0,	http://www.phoenix.com/
		Format Specification	January 25, 1995,	PlatSS/products/specs.html
			Phoenix Technologies Limited
			and International Business
			Machines Corporation.
Front Panel		Front Panel I/O	Version 1.0,	http://www.formfactors.org/
		Connectivity Design	October 2000,	formfactors/
		Guide	Intel Corporation.	front_panel_io.htm
LPC		Low Pin Count Interface	Revision 1.0,	http://www.intel.com/
		Specification	September 29, 1997,	design/chipsets/industry/
			Intel Corporation.	lpc.htm
OHCI		OpenHCI – Open Host	Release 1.0a,	http://www.usb.org/
		Controller Interface	October 10, 1996,	developers/docs.html
		Specification for USB	Compaq computer Corp.,
			Microsoft Corporation, and
			National Semiconductor Corp.
PCI		PCI Local Bus	Revision 2.2,	http://www.pcisig.com/
		Specification	December 18, 1998,	specifications
			PCI Special Interest Group.
		PCI Bus Power	Revision 1.1,	http://www.pcisig.com/
		Management Interface	December 18, 1998,	specifications
		Specification	PCI Special Interest Group.
Plug and		Plug and Play BIOS	Version 1.0a,	http://www.microsoft.com/
Play		Specification	May 5, 1994,	hwdev/tech/PnP/
			Compaq Computer Corporation,	default.asp
			Phoenix Technologies Limited,
			and Intel Corporation.
				continued

18

Product Description

Table 3.	Specifications (continued)
Reference		Specification	Version, Revision Date	The information is
Name		Title	and Ownership	available from…
PXE		Preboot Execution	Version 2.1,	ftp://download.intel.com/
		Environment	September 20, 1999,	labs/manage/wfm/
			Intel Corporation.	download/pxespec.pdf
SMBIOS		System Management	Version 2.3.1,	http://www.dmtf.org/
		BIOS	March 16, 1999,	download/standards/
			American Megatrends	DSP0119.pdf
			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.
UHCI		Universal Host Controller	Revision 1.1,	http://www.usb.org/
		Interface Design Guide	March 1996,	developers/docs.html
			Intel Corporation.
USB		Universal Serial Bus	Revision 2.0,	http://www.usb.org/
		Specification	April 27, 2000,	developers/docs.html
			Compaq Computer Corporation,
			Hewlett-Packard Company,
			Lucent Technologies Inc.,
			Intel Corporation,
			Microsoft Corporation,
			NEC Corporation, and
			Koninklijke Philips Electronics
			N.V.
WfM		Wired for Management	Version 2.0,	http://www.intel.com/labs/
		Baseline	December 18, 1998,	manage/wfm/
			Intel Corporation.	wfmspecs.htm

19

Intel Desktop Board D845EBT Technical Product Specification

1.5 Processor

CAUTION

Use of unsupported processors can damage the Desktop Board D845EBT, the processor, and the power supply. See Intel’s World Wide Web site for the most up-to-date list of supported processors for the Desktop Board D845EBT.

The Desktop Board D845EBT supports:

•A Pentium 4 processor in a PGA478 socket with a system bus of 400/533 MHz

•A Celeron processor in a PGA478 socket with a system bus of 400 MHz

The list of supported processors for the Desktop Board D845EBT is available from Intel’s World Wide Web site. All supported onboard memory can be cached. See the processor’s data sheet for cachability limits.

NOTE

Do not use a standard ATX power supply. The Desktop Board D845EBT will not boot with a standard ATX power supply. Use only ATX12V-compliant power supplies with the Desktop Board D845EBT. ATX12V power supplies have an additional power lead that provides required supplemental power for the processor. Connect the 20-pin and 4-pin leads of ATX12V power supplies to the corresponding connectors on the Desktop Board D845EBT or it will not boot.

For information about

Supported processors

Processor usage

Power supply connectors

Refer to

Section 1.2, page 16

Section 1.2, page 16

Section 2.8.2.2, page 59

20

Product Description

1.6 System Memory

The Desktop Board D845EBT has two DIMM sockets and supports the following memory features:

•2.5 V (only) 184-pin DDR SDRAM DIMMs with gold-plated contacts

•Unbuffered, unregistered single-sided or double-sided DIMMs

•Maximum total system memory: 2 GB (see second NOTE below)

•Minimum total system memory: 64 MB

•200/266 MHz DDR SDRAM DIMMs only

•Serial Presence Detect

•Suspend to RAM

•Non-ECC and ECC DIMMs

NOTES

•Remove the AGP video card before installing or upgrading memory to avoid interference with the memory retention mechanism.

•The Desktop Board D845EBT has 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 desktop board. Please refer to the following Intel web sites for the latest lists of tested memory.

http://developer.intel.com/design/motherbd/bt/bt_mem.htm

•To be fully compliant with all applicable DDR SDRAM memory specifications, the Desktop Board D845EBT should be populated with DIMMs that support the Serial Presence Detect (SPD) data structure. This allows the BIOS to read the SPD data and program the chipset to accurately configure memory settings for optimum performance. If non-SPD memory is installed, the BIOS will attempt to correctly configure the memory settings, but performance and reliability may be impacted or the DIMMs may not function under the determined frequency.

•For ECC functionality, all installed DIMMs must be ECC.

For information about	Refer to
Obtaining DDR SDRAM specifications	Section 1.4, page 17

21

Intel Desktop Board D845EBT Technical Product Specification

Table 4 lists the supported DIMM configurations.

Table 4.	Supported Memory Configurations
DIMM			DDR SDRAM	DDR SDRAM Organization		Number of DDR
Capacity		Configuration	Density	Front-side/Back-side		SDRAM Devices
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 the second column, “DS” refers to double-sided memory modules (containing two rows of DDR SDRAM) and “SS” refers to single-sided memory modules (containing one row of DDR SDRAM).

22

Product Description

1.7 Intel® 845E Chipset

The Intel 845E chipset consists of the following devices:

•Intel 82845E Memory Controller Hub (MCH) with Accelerated Hub Architecture (AHA) bus

•Intel 82801DB I/O Controller Hub (ICH4) with AHA bus

•Firmware Hub (FWH)

The MCH 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 Desktop Board D845EBT’s I/O paths. The FWH provides the nonvolatile storage of the BIOS. The component combination provides the chipset interfaces as shown in Figure 3.

UDMA 33

Network

ATA-66/100

System Bus				USB

		845E Chipset
	82845E	AHA	82801DB	4 Mbit Firmware
	Memory Controller		I/O Controller Hub
		Bus		Hub (FWH)
	Hub (MCH)		(ICH4)

LPC Bus

AGP

DDR SDRAM

SMBus

PCI Bus

AC Link

Interface

Bus

OM14259

Figure 3. Intel 845E Chipset Block Diagram

For information about

The Intel 845E chipset

Resources used by the chipset

Refer to

http://developer.intel.com

Chapter 2

23

Intel Desktop Board D845EBT Technical Product Specification

1.7.1AGP

AGP is a high-performance interface for graphics-intensive applications, such as 3D applications. While based on the PCI Local Bus Specification, Rev. 2.2, AGP is independent of the PCI bus and is intended for exclusive use with graphical display devices. AGP overcomes certain limitations of the PCI bus related to handling large amounts of graphics data with the following features:

•Pipelined memory read and write operations that hide memory access latency

•Demultiplexing of address and data on the bus for nearly 100 percent efficiency

NOTES

•The AGP connector is keyed for 1.5 V Switching Voltage Level (SVL) AGP cards only; the connector is not mechanically compatible with legacy 3.3 V AGP cards. Do not attempt to install a legacy 3.3 V AGP card.

•Install memory in the DIMM sockets prior to installing the AGP video card to avoid interference with the memory retention mechanism.

For information about

The location of the AGP connector

The signal names of the AGP connector

Obtaining the Accelerated Graphics Port Interface Specification

Refer to

Figure 1, page 14

Table 36, page 65

Section 1.4, page 17

1.7.2USB

The Desktop Board D845EBT supports up to six USB 2.0 ports, fully supports UHCI and EHCI, and uses UHCIand EHCI-compatible drivers. For more than six USB devices, an external hub can be connected to any of the ports.

The ICH4 provides the USB controller for all ports, as shown in Figure 4. The port arrangement is as follows:

•Two ports are implemented with stacked back panel connectors, adjacent to the PS/2 connectors

•Two ports are implemented with stacked back panel connectors, adjacent to the audio connectors

•Two ports are routed to the front panel USB connector

							Back panel USB connectors
			USB			USB ports (2)
82801DB							adjacent to the PS/2 ports
							Back panel USB connectors
			USB			USB ports (2)
I/O Controller Hub
							adjacent to the audio connectors
(ICH4)
			USB			USB ports (2)	Front panel USB connectors
							OM14260

Figure 4. USB Port Configuration

24

Product Description

NOTES

•Computer systems that have an unshielded cable attached to a USB port may not meet FCC Class B requirements, even if no device is attached to the cable. Use shielded cable that meets the requirements for full-speed devices.

•USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system.

For information about

The location of the USB connectors on the back panel

The signal names of the back panel USB connectors

The location of the front panel USB connector

The signal names of the front panel USB connector

The front panel, EHCI, UHCI, and USB specifications

Refer to

Figure 10, page 54

Table 18, page 55

Figure 13, page 69

Table 44, page 70

Section 1.4, page 17

1.7.3IDE Support

1.7.3.1IDE Interfaces

The ICH4’s IDE controller has two independent bus-mastering IDE interfaces that can be independently enabled. The IDE interfaces support the following modes:

•Programmed I/O (PIO): processor controls data transfer.

•8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec.

•Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates of up to 33 MB/sec.

•ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates of up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver compatible.

•ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH4’s ATA-100 logic can achieve read transfer rates up to 100 MB/sec and write transfer rates up to 88 MB/sec.

NOTE

ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections, noise, and inductive coupling.

The IDE interfaces also support ATAPI devices (such as CD-ROM drives) and ATA devices using the transfer modes listed in Section 4.4.4.1 on page 104.

The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS.

The Desktop Board D845EBT supports Laser Servo (LS-120) diskette technology through the IDE interfaces. The BIOS supports booting from an LS-120 drive.

25

Intel Desktop Board D845EBT Technical Product Specification

NOTE

The BIOS will always recognize an LS-120 drive as an ATAPI floppy drive. To ensure correct operation, do not configure the drive as a hard disk drive.

For information about

The location of the IDE connectors

The signal names of the IDE connectors

IDE RAID support

Refer to

Figure 12, page 62

Table 39, page 67

Section 1.8, page 27

1.7.3.2SCSI Hard Drive Activity LED Connector

The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in SCSI controller to use the same LED as the onboard IDE controller. For proper operation, this connector should be wired to the LED output of the add-in SCSI controller. The LED indicates

when data is being read from, or written to, both the add-in SCSI controller and the IDE controller.

For information about

The location of the SCSI hard drive activity LED connector

The signal names of the SCSI hard drive activity LED connector

Refer to

Figure 12, page 62

Table 40, page 67

1.7.4Real-Time Clock, CMOS SRAM, and Battery

A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied.

NOTE

If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS RAM at power-on.

1.7.54 Mbit Firmware Hub (FWH)

The FWH provides the following:

•System BIOS program

•Logic that enables protection for storing and updating of platform information

26

Product Description

1.8 IDE RAID Controller

The Promise Technology PDC20267 is a PCI bus-mastering ATA controller of a redundant array of independent disks (RAID). The controller supports:

•Up to four UDMA 100/66/33 drives or EIDE drives

•RAID 0 (striping)

•RAID 1 (mirroring)

•RAID 0+1 (striping, then mirroring)

•100 MB/sec data transfer with CRC error checking

•A bootable array

•Hot swapping of failed mirrored drives

For information about

The location of the IDE RAID connectors

The signal names of the IDE RAID connectors

BIOS Setup program’s Boot menu

Refer to

Figure 12, page 62

Table 41, page 68

Table 79, page 113

1.9 I/O Controller

The SMSC LPC47M102 I/O controller provides the following features:

•Two serial ports

•One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support

•Serial IRQ interface compatible with serialized IRQ support for PCI systems

•PS/2-style mouse and keyboard interfaces

•Interface for one 1.44 MB or 2.88 MB diskette drive

•Intelligent power management, including a programmable wake-up event interface

•PCI power management support

The BIOS Setup program provides configuration options for the I/O controller.

For information about	Refer to
SMSC LPC47M102 I/O controller	http://www.smsc.com

1.9.1Serial Ports

The Desktop Board D845EBT has two serial port connectors. Serial port A is located on the back panel. Serial port B is accessible using a connector located near the main power connector. The serial ports support data transfers at speeds up to 115.2 kbits/sec with BIOS support.

For information about

The location of the serial port A connector

The signal names of the serial port A connector

The location of the serial port B connector

The signal names of the serial port B connector

Refer to

Figure 10, page 54

Table 19, page 55

Figure 13, page 69

Table 43, page 70

27

Intel Desktop Board D845EBT Technical Product Specification

1.9.2Parallel Port

The 25-pin D-Sub parallel port connector is located on the back panel. Use the BIOS Setup program to set the parallel port mode.

For information about

The location of the parallel port connector

The signal names of the parallel port connector

Setting the parallel port’s mode

Refer to

Figure 10, page 54

Table 20, page 56

Table 68, page 101

1.9.3Diskette Drive Controller

The I/O controller supports one diskette drive. Use the BIOS Setup program to configure the diskette drive interface.

For information about

The location of the diskette drive connector

The signal names of the diskette drive connector

The supported diskette drive capacities and sizes

Refer to

Figure 12, page 62

Table 38, page 66

Table 71, page 106

1.9.4Keyboard and Mouse Interface

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

NOTE

The keyboard is supported in the bottom PS/2 connector and the mouse is supported in the top PS/2 connector. Power to the computer should be turned off before a keyboard or mouse is connected or disconnected.

For information about

The location of the keyboard and mouse connectors

The signal names of the keyboard and mouse connectors

Refer to

Figure 10, page 54

Table 16, page 55

28

Product Description

1.10 IEEE 1394a-2000 Controller

The Agere Systems FW323 PCI bus-based controller provides IEEE 1394a-2000 OHCI link and PHY core functionality. The controller supports:

•IEEE 1394a-2000-compliant or IEEE 1394-1995-compliant peripheral devices

•Isochronous and asynchronous data transfer

•Data transfer up to 400 Mbits/sec

•Peripheral hot swapping

•Plug and play

The Desktop Board D845EBT has one back panel and two front panel IEEE 1394a-2000 connectors.

NOTE

IEEE 1394a-2000 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system.

For information about

The location of the back panel IEEE 1394a-2000 connector

The signal names of the back panel IEEE 1394a-2000 connector

The location of the front panel IEEE 1394a-2000 connectors

The signal names of the front panel IEEE 1394a-2000 connectors

Obtaining IEEE standards:

Refer to

Figure 10, page 54

Table 17, page 55

Figure 13, page 69

Table 45, page 71

Table 3, page 17

•1394-1995, IEEE Standard for a High Performance Serial Bus

•1394a-2000, IEEE Standard for a High Performance Serial Bus – Amendment 1

1.11Audio Subsystem

The Desktop Board D845EBT includes one of the following:

•6-channel audio subsystem based on the Analog Devices AD1980 codec (described on page 30)

•2-channel audio subsystem based on the Analog Devices AD1981A codec (described on page 31)

Both audio subsystems feature:

•Split digital/analog architecture for improved S/N (signal-to-noise) ratio: > 90 dB

•Power management support for ACPI 2.0 (driver dependent)

29

Intel Desktop Board D845EBT Technical Product Specification

1.11.16-Channel Audio Subsystem (Optional)

The audio subsystem includes the following:

•Intel 82801DB I/O Controller Hub (ICH4)

•Analog Devices AD1980 audio codec

•Microphone input that supports either of the following:A single dynamic, condenser, or electret microphone

Dual microphones for use with voice recognition software The subsystem includes the following connectors:

•Front panel analog audio connector that can be used as a connector for routing the following signals to the front panel or used as a jumper block for routing the signals to the back panel (see page 73 for more information). The connector/jumper block includes pins for:

Front left/right out

Mic in

•Back panel analog audio connectors:

Front left/right out

Center/Low Frequency Effects (LFE) out

Rear left/right out

Line in

Mic in

•Back panel digital line out (S/PDIF) connector

•ATAPI-style CD-ROM connector

Figure 6 is a block diagram of the 6-channel audio subsystem.

Front Left/Right Out

Center/LFE Out

82801DB

Rear Left/Right Out

AC ’97

AD1980

I/O Controller Hub

Line In

Link

Audio Codec

(ICH4)

Mic In

CD-ROM

S/PDIF Out

OM14465

Figure 5. 6-Channel Audio Subsystem Block Diagram

For information about

The front panel audio connector

The back panel audio connectors

Refer to

Section 2.8.3, page 69

Section 2.8.1, page 54

30