Intel SR440BX User Manual

SR440BX Motherboard

Technical Product Specification

February 1999

Order Number 732534-001

The SR440BX motherboard 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 SR440BX Motherboard Specification Update.

Revision History

Revision	Revision History	Date
-001	First release of the SR440BX Motherboard Technical Product Specification	February 1999

This product specification applies only to standard SR440BX motherboards with BIOS identifier 4S4RB0XA.86A.

Changes to this specification will be published in the SR440BX Motherboard Specification Update before being incorporated into a revision of this document.

Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. 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 products are not intended for use in medical, life saving, or life sustaining applications.

Intel retains the right to make changes to specifications and product descriptions at any time, without notice.

The SR440BX motherboard may contain design defects or errors known as errata which 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.

† Third-party brands and names are the property of their respective owners.

Copyright © 1999, Intel Corporation. All rights reserved.

Preface

This Technical Product Specification (TPS) specifies the board layout, components, connectors, power and environmental requirements, and the BIOS for the SR440BX motherboard. It describes the standard motherboard product and available manufacturing options.

Intended Audience

The TPS is intended to provide detailed, technical information about the motherboard 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 this board

2A map of the resources of the board

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

6A list of where to find information about specifications supported by the motherboard

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

SR440BX Motherboard 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 motherboard, 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.
KB	Kilobyte (1024 bytes)
Kbit	Kilobit (1024 bits)
MB	Megabyte (1,048,576 bytes)
Mbit	Megabit (1,048,576 bits)
GB	Gigabyte (1,073,741,824 bytes)
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 Motherboard Description

1.1	Overview ...................................................................................................................		12
1.2	Motherboard Layout ..................................................................................................		13
1.3	Processor ..................................................................................................................		15
1.4	System Memory.........................................................................................................		16
1.5	Chipset ......................................................................................................................		17
	1.5.1	Intel® 82443BX PAC....................................................................................	17
	1.5.2	Intel® 82371EB (PIIX4E) .............................................................................	18
	1.5.3	USB.............................................................................................................	19
	1.5.4	IDE Support.................................................................................................	19
	1.5.5	Real-Time Clock, CMOS SRAM, and Battery..............................................	20
1.6	I/O Controller .............................................................................................................		20
	1.6.1	Serial Ports..................................................................................................	21
	1.6.2	Parallel Port.................................................................................................	21
	1.6.3	Diskette Drive Controller..............................................................................	21
	1.6.4	Keyboard and Mouse Interface ...................................................................	21
1.7	AGP Graphics Subsystem .........................................................................................		22
	1.7.1	NVIDIA RIVA TNT Graphics Controller........................................................	22
	1.7.2	Video Interface Port (Optional) ....................................................................	23
1.8	Audio Subsystem.......................................................................................................		23
	1.8.1	Sound Blaster AudioPCI 64V Audio Controller ............................................	24
	1.8.2	Crystal Semiconductor CS4297 Stereo Audio Codec ..................................	24
	1.8.3	Audio Connectors........................................................................................	24
	1.8.4	Audio Drivers and Utilities ...........................................................................	25
1.9	Hardware Monitor (Optional) .....................................................................................		25
1.10	SCSI Hard Drive LED Connector (Optional) ..............................................................		25
1.11	Wake on LAN Technology (Optional).........................................................................		26
1.12	Wake on Ring ............................................................................................................		26
1.13	Power Connector.......................................................................................................		26
1.14	Speaker .....................................................................................................................		26
1.15	Connectors ................................................................................................................		27
	1.15.1 Back Panel I/O Connectors .........................................................................		28
	1.15.2	Midboard Connectors ..................................................................................	32
	1.15.3	Front Panel Connectors ..............................................................................	44
1.16	BIOS Setup Configuration Jumper Block ...................................................................		47
1.17	Mechanical Considerations........................................................................................		48
	1.17.1	Form Factor.................................................................................................	48
	1.17.2	I/O Shield ....................................................................................................	49
1.18	Electrical Considerations ...........................................................................................		50
	1.18.1	Add-in Board Considerations.......................................................................	50
	1.18.2	Power Consumption ....................................................................................	50
	1.18.3	Power Supply Considerations......................................................................	51

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SR440BX Motherboard Technical Product Specification

	1.19	Thermal Considerations.............................................................................................		52
	1.20 Reliability ...................................................................................................................			54
	1.21	Environmental............................................................................................................		54
	1.22 Regulatory Compliance .............................................................................................			55
2	Motherboard Resources
	2.1	Memory Map .............................................................................................................		57
	2.2	DMA Channels ..........................................................................................................		58
	2.3	I/O Map .....................................................................................................................		58
	2.4	PCI Configuration Space Map ...................................................................................		60
	2.5	Interrupts ...................................................................................................................		61
	2.6	PCI Interrupt Routing Map .........................................................................................		61
3 Overview of BIOS Features
	3.1	Introduction................................................................................................................		63
	3.2	BIOS Flash Memory Organization .............................................................................		64
	3.3	Resource Configuration .............................................................................................		64
		3.3.1	Plug and Play: PCI Autoconfiguration.........................................................	64
		3.3.2	ISA Plug and Play .......................................................................................	64
		3.3.3	PCI IDE Support..........................................................................................	65
	3.4	SMBIOS	....................................................................................................................	65
	3.5	Power Management ..................................................................................................		65
		3.5.1	APM ............................................................................................................	65
		3.5.2	ACPI............................................................................................................	66
	3.6	BIOS Upgrades .........................................................................................................		68
		3.6.1	Language Support.......................................................................................	69
		3.6.2	OEM Logo or Scan Area .............................................................................	69
	3.7	Recovering BIOS Data ..............................................................................................		69
	3.8	Boot Options..............................................................................................................		70
		3.8.1	CD-ROM and Network Boot ........................................................................	70
		3.8.2	Booting Without Attached Devices ..............................................................	70
	3.9	USB Legacy Support .................................................................................................		71
	3.10 BIOS Security Features .............................................................................................			72
4	BIOS Setup Program
	4.1	Introduction................................................................................................................		73
	4.2	Maintenance Menu ....................................................................................................		74
	4.3	Main Menu.................................................................................................................		75
	4.4	Advanced Menu.........................................................................................................		76
		4.4.1	Boot Setting Configuration Submenu ..........................................................	76
		4.4.2	Peripheral Configuration Submenu..............................................................	77
		4.4.3	IDE Controller Submenu..............................................................................	79
		4.4.4	IDE Device Configuration Submenus ..........................................................	80
		4.4.5	Diskette Configuration Submenu .................................................................	81
		4.4.6	Event Log Configuration Submenu..............................................................	81
		4.4.7	Video Configuration Submenu.....................................................................	82
		4.4.8	Resource Configuration Submenu...............................................................	82

vi

Contents

4.5	Security Menu............................................................................................................	83
4.6	Power Menu ..............................................................................................................	84
4.7	Boot Menu .................................................................................................................	85
4.8	Exit Menu ..................................................................................................................	86
5 Error Messages and Beep Codes
5.1	BIOS Error Messages................................................................................................	87
5.2	Port 80h POST Codes ...............................................................................................	89
5.3	Bus Initialization Checkpoints ....................................................................................	93
5.4	BIOS Beep Codes .....................................................................................................	94
6 Specifications and Customer Support
6.1	Online Support...........................................................................................................	95
6.2	Specifications ............................................................................................................	95
Figures
1.	Motherboard Components .........................................................................................	13
2.	Motherboard Block Diagram ......................................................................................	14
3.	Connector Groups .....................................................................................................	27
4.	Back Panel I/O Connectors .......................................................................................	28
5.	Midboard Audio/Video Connectors ............................................................................	33
6.	Peripheral Interface Connectors ................................................................................	35
7.	Hardware Management and Power Connectors ........................................................	38
8.	Add-In Board Connectors ..........................................................................................	40
9.	Front Panel I/O Connectors .......................................................................................	44
10.	Location of the BIOS Setup Configuration Jumper Block...........................................	47
11.	Motherboard Dimensions...........................................................................................	48
12.	Back Panel I/O Shield Dimensions (microATX Chassis-Independent) .......................	49
13.	Thermally-sensitive Components...............................................................................	52
Tables
1.	Processors Supported by the Motherboard ...............................................................	15
2.	NVIDIA RIVA TNT Refresh Rates..............................................................................	23
3.	PS/2 Keyboard/Mouse Connectors............................................................................	29
4.	USB Stacked Connector............................................................................................	29
5.	Serial Port A Connector .............................................................................................	29
6.	Parallel Port Connector..............................................................................................	30
7.	VGA Connector .........................................................................................................	30
8.	Audio Line-In Connector ............................................................................................	31
9.	Audio Line-Out Connector .........................................................................................	31
10.	Audio Mic In Connector .............................................................................................	31
11.	MIDI/Game Port Connector .......................................................................................	31
12.	Auxiliary Line In Connector (natural) (J2D2) ..............................................................	34
13.	Telephony Connector (green) (J2D1) ........................................................................	34
14.	CD-ROM Connector (ATAPI-style) (black) (J2E1) .....................................................	34
15.	CD-ROM Connector (Legacy-style 2 mm) (white) (J1E2) ..........................................	34
16.	VIP Connector (J7G1) ...............................................................................................	35
17.	SCSI LED Connector (J8E1) .....................................................................................	36

vii

SR440BX Motherboard Technical Product Specification

18.	Diskette Drive Connector (J10E1) .............................................................................	36
19.	PCI IDE Connectors (J9E2, J9E1).............................................................................	37
20.	Serial Port B Connector (J10B1)................................................................................	37
21.	Chassis Intrusion Connector (J4K1) ..........................................................................	38
22.	Fan 3 (Processor Fan) Connector (J4K2) ..................................................................	39
23.	Power Connector (J7J1) ............................................................................................	39
24.	Wake on Ring Connector (J10C2) .............................................................................	39
25.	Fan 1 (Power Supply Fan) Connector (optional) (J10J1) ...........................................	39
26.	Wake on LAN Technology Connector (J9J3) .............................................................	40
27.	Fan 2 (System Fan) Connector (J10C1) ....................................................................	40
28.	ISA Bus Connector ....................................................................................................	41
29.	PCI Bus Connectors ..................................................................................................	43
30.	Front Panel I/O Connectors (J9H2) ...........................................................................	45
31.	Power LED (Single-colored) ......................................................................................	45
32.	Power LED (Dual-colored) .........................................................................................	45
33.	Power LED Front Panel Connector (J9J2).................................................................	46
34.	BIOS Setup Configuration Jumper Settings...............................................................	47
35.	DC Voltage ................................................................................................................	50
36.	Power Usage .............................................................................................................	50
37.	Fan 2 (System Fan) DC Power Requirements...........................................................	51
38.	Thermal Considerations for Components ..................................................................	53
39.	Motherboard Environmental Specifications................................................................	54
40.	Safety Regulations ....................................................................................................	55
41.	EMC Regulations.......................................................................................................	55
42.	System Memory Map.................................................................................................	57
43.	DMA Channels ..........................................................................................................	58
44.	I/O Map .....................................................................................................................	58
45.	PCI Configuration Space Map ...................................................................................	60
46.	Interrupts ...................................................................................................................	61
47.	PCI Interrupt Routing Map .........................................................................................	62
48.	Flash Memory Organization.......................................................................................	64
49.	APM Wake Up Devices and Events...........................................................................	66
50.	Effects of Pressing the Power Switch ........................................................................	66
51.	Power States and Targeted System Power ...............................................................	67
52.	ACPI Wake Up Devices and Events ..........................................................................	68
53.	Supervisor and User Password Functions .................................................................	72
54.	Setup Menu Bar ........................................................................................................	73
55.	Setup Function Keys..................................................................................................	74
56.	Maintenance Menu ....................................................................................................	74
57.	Main Menu.................................................................................................................	75
58.	Advanced Menu.........................................................................................................	76
59.	Boot Setting Configuration Submenu.........................................................................	76
60.	Peripheral Configuration Submenu ............................................................................	77
61.	IDE Device Configuration ..........................................................................................	79
62.	IDE Device Configuration Submenus.........................................................................	80
63.	Diskette Configuration Submenu ...............................................................................	81
64.	Event Log Configuration Submenu ............................................................................	81
65.	Video Configuration Submenu ...................................................................................	82

viii

Contents

66.	Resource Configuration Submenu.............................................................................	82
67.	Security Menu............................................................................................................	83
68.	Power Menu ..............................................................................................................	84
69.	Boot Menu .................................................................................................................	85
70.	Exit Menu ..................................................................................................................	86
71.	BIOS Error Messages................................................................................................	87
72.	Uncompressed INIT Code Checkpoints.....................................................................	89
73.	Boot Block Recovery Code Check Points ..................................................................	89
74.	Runtime Code Uncompressed in F000 Shadow RAM ...............................................	90
75.	Beep Codes...............................................................................................................	94
76.	Compliance with Specifications .................................................................................	95

ix

SR440BX Motherboard Technical Product Specification

x

1 Motherboard Description

What This Chapter Contains
1.1	Overview ...................................................................................................................	12
1.2	Motherboard Layout ..................................................................................................	13
1.3	Processor ..................................................................................................................	15
1.4	System Memory.........................................................................................................	16
1.5	Chipset ......................................................................................................................	17
1.6	I/O Controller .............................................................................................................	20
1.7	AGP Graphics Subsystem .........................................................................................	22
1.8	Audio Subsystem.......................................................................................................	23
1.9	Hardware Monitor (Optional) .....................................................................................	25
1.10	SCSI Hard Drive LED Connector (Optional) ..............................................................	25
1.11	Wake on LAN Technology (Optional).........................................................................	26
1.12	Wake on Ring ............................................................................................................	26
1.13	Power Connector.......................................................................................................	26
1.14	Speaker .....................................................................................................................	26
1.15	Connectors ................................................................................................................	27
1.16	BIOS Setup Configuration Jumper Block ...................................................................	47
1.17	Mechanical Considerations........................................................................................	48
1.18	Electrical Considerations ...........................................................................................	50
1.19	Thermal Considerations.............................................................................................	52
1.20	Reliability ...................................................................................................................	54
1.21	Environmental............................................................................................................	54
1.22	Regulatory Compliance .............................................................................................	55

11

SR440BX Motherboard Technical Product Specification

1.1 Overview

The SR440BX motherboard is available with the following features:

Feature

Form Factor

Expansion Slots

Microprocessor

Main Memory

Chipset

I/O Control

Peripheral

Interfaces

Video

Audio

BIOS

Other Features

microATX: 9.6 x 9.6 inches

Three dedicated PCI slots

One shared ISA/PCI slot

Support for the following processors:

∙Intel®Pentium®III processor with 100-MHz host bus speed

∙Intel®Pentium II processor with 66-MHz or 100-MHz host bus speed

∙Intel®Celeron™ processor with 66-MHz host bus speed

Two 168-pin dual inline memory module (DIMM) sockets

Supports up to 512 MB of 66 MHz or 100 MHz synchronous DRAM (SDRAM) Supports Error Checking and Correcting (ECC) and non-ECC memory

Intel®82440BX, consisting of:

∙Intel®82443BX PCI/AGP controller (PAC)

∙Intel®82371EB PCI ISA IDE Xcelerator (PIIX4E) SMSC FDC37M807 Super I/O controller

∙Two serial ports

∙Two Universal Serial Bus (USB) ports

∙One parallel port

∙Two IDE interfaces with Ultra DMA support

∙Single diskette drive

∙NVIDIA† RIVA TNT† Enhanced 128-Bit 3D Processor

∙16 MB SDRAM video memory

∙VIP video side port (optional)

AC ’97 Crystal CS4297 audio codec

Sound Blaster† AudioPCI 64V digital audio controller

∙Intel/AMI BIOS

∙Intel®E28F004B5 4 Mbit boot block flash memory

∙Support for SMBIOS, Advanced Power Management (APM), Advanced Configuration and Power Management Interface (ACPI), and Plug and Play (see Section 6.2 for specification compliance levels)

∙Speaker

∙Hardware monitor (optional)

∙Wake on Ring

∙Wake on LAN† technology (optional)

∙SCSI LED connector (optional)

12

Motherboard Description

1.2 Motherboard Layout

Figure 1 shows the location of the major components on the motherboard.

	A	B	C	D E	F
II
						G
HH						H
						I
						J
GG						K
FF						L
						M
EE
						N
DD
CC						O
BB
						P
AA	Z	Y	W	U	S R	Q
			X	V	T
						OM07649

ACS4297 audio codec

BAuxiliary line in connector

CTelephony connector

DLegacy-style CD-ROM connector

EATAPI-style CD-ROM connector

FBack panel connectors

GProcessor connector

HChassis intrusion connector (optional)

IFan 3 (processor) connector

JIntel 82443BX PAC

KDIMM sockets

LPower supply connector

MVIP video connector (optional)

NSpeaker

OSDRAM video memory

PFront panel LED connector

QWake on LAN technology connector (optional)

RFan 1 (power supply) connector (optional)

SFront panel connector

TSCSI LED connector (optional)

UConfiguration jumper block

VDiskette drive connector

WPrimary IDE connector

XSecondary IDE connector

YFan 2 (system) connector

ZWake on Ring connector

AASerial port B connector (optional)

BBSMSC I/O controller

CCIntel 82371EB PIIX4E

DDGraphics controller

EEBattery

FFFlash memory

GGSound Blaster Audio PCI 64V audio controller

HHPCI connectors

IIISA connector

Figure 1. Motherboard Components

13

SR440BX Motherboard Technical Product Specification

Figure 2 is a block diagram of the SR440BX motherboard.

		Processor		VIP
				Video
				Port
				nVIDIA			SDRAM
	SDRAM	82443BX	AGP Bus	RIVA TNT
	DIMMs	PAC		Graphics			Video
				Controller			Memory
	Clock
	Generator			Hardware
						PCI Slots
				Monitor
			SM Bus
			PCI Bus
						Aux
				Modem	Audio		CD-ROM
	Primary IDE			Audio			Audio
	Secondary IDE	82371EB					Line In
	USB Port 1		Sound Blaster
		PIIX4E		CS4297			Line Out
	USB Port 0		AudioPCI 64V
				AC ’97		Audio
							Mic
			Digital Audio	Bus	Codec
			Controller
	Back Panel						Game Port

Back Panel

Back Panel

		ISA Bus
		Diskette
	Parallel Port		ISA Slot
	Serial Port A	FDC37M807	Boot Block
	Serial Port B	I/O Controller
			Flash Memory

IrDA

Mouse Keyboard

Back Panel

OM07650

Figure 2. Motherboard Block Diagram

14

Motherboard Description

1.3 Processor

The motherboard supports a single Pentium III, Pentium II, or Celeron processor. The host bus speed (66 MHz or 100 MHz) is automatically selected. The processor connects to the motherboard through the 242-contact slot connector. The processor must be secured by a retention mechanism attached to the motherboard.

CAUTION

The motherboard supports Pentium III processors with a 100-MHz host bus, Pentium II processors with a 100or 66-MHz host bus, and Celeron processors with a 66-MHz host bus. Processors with a 100-MHz host bus should be used only with 100-MHz SDRAM; the motherboard may not operate reliably if a processor with a 100-MHz host bus is paired with 66-MHz SDRAM. However, processors with a 66-MHz host bus can be used with either 66-MHz or 100-MHz SDRAM.

The motherboard supports the processors listed in Table 1.

Table 1. Processors Supported by the Motherboard

		Host Bus
Processor Type	Processor Speed	Frequency	L2 Cache Size	Package Type
Pentium II	233	66 MHz	512 KB	Single Edge
processor	266	66 MHz	512 KB	Contact cartridge
	300	66 MHz	512 KB
	333	66 MHz	512 KB
	350	100 MHz	512 KB
	400	100 MHz	512 KB
	450	100 MHz	512 KB
Pentium III	450	100 MHz	512 KB	Single Edge
processor	500	100 MHz	512 KB	Contact cartridge
Celeron processor	266	66 MHz	None	Single Edge
	300	66 MHz	None	Processor package
	300A	66 MHz	128 KB
	333	66 MHz	128 KB
	366	66 MHz	128 KB
	400	66 MHz	128 KB

For processors with L2 cache, all supported onboard memory can be cached.

15

SR440BX Motherboard Technical Product Specification

1.4 System Memory

The motherboard has two DIMM sockets. The minimum memory size is 16 MB and the maximum memory size is 512 MB. The BIOS automatically detects memory type, size, and speed. Memory can be installed in one or both sockets. Memory size can vary between sockets.

NOTE

Processors with 100 MHz host bus should be paired only with 100 MHz SDRAM. Processors with 66 MHz host bus can be paired with either 66 MHz or 100 MHz SDRAM.

The motherboard supports the following memory features:

∙168-pin DIMMs with gold-plated contacts

∙66 and 100 MHz (matching host bus speed) unbuffered SDRAM only

∙Non-ECC (64-bit) and ECC (72-bit) memory

∙100 MHz memory shall be Serial Presence Detect (SPD) memory; 66 MHz may be either SPD or non-SPD

∙3.3 V memory only

∙Singleor double-sided DIMMs in the following sizes:

DIMM Size	Non-ECC Configuration	ECC Configuration
16 MB	2 Mbit x 64	2 Mbit x 72
32 MB	4 Mbit x 64	4 Mbit x 72
64 MB	8 Mbit x 64	8 Mbit x 72
128 MB	16 Mbit x 64	16 Mbit x 72
256 MB	32 Mbit x 64	32 Mbit x 72

When ECC memory is installed, the BIOS supports both ECC and non-ECC mode. ECC mode is enabled in the Setup program. The BIOS automatically detects if ECC memory is installed and provides the Setup option for selecting ECC mode. If any non-ECC memory is installed, the Setup option for ECC mode does not appear and ECC operation is not available.

The following table describes the effect of using Setup to put each memory type in each supported mode:

	Memory Error Detection Mode Established in Setup Program
	ECC Disabled	ECC Enabled
Non-ECC DIMM	No error detection	N/A
ECC DIMM	No error detection	Single-bit error correction, multiple-bit
		error detection

Whenever ECC mode is selected in Setup, some performance loss occurs.

16

Motherboard Description

NOTE

All memory components and DIMMs used with the SR440BX motherboard should comply with the PC SDRAM Specifications. These include: the PC SDRAM Specification (memory component specific), the PC Unbuffered SDRAM Specifications, and the PC Serial Presence Detect Specification. See Section 6.2 for information about these specifications.

1.5 Chipset

The Intel 82440BX AGPset consists of the Intel 82443BX PAC and the Intel 82371EB PIIX4E bridge chip. The PAC provides an optimized DRAM controller and an Accelerated Graphics Port (AGP) interface. The I/O subsystem of the 82440BX is based on the PIIX4E, which is a highly integrated PCI ISA IDE Xcelerator Bridge.

1.5.1Intel®82443BX PAC

The Intel 82443BX PAC provides bus-control signals, address paths, and data paths for transfers between the processor’s host bus, PCI bus, the AGP, and main memory. The PAC features:

·Processor interface control

¾Support for processor host bus frequencies of 100 MHz and 66 MHz

¾32-bit addressing

¾Desktop optimized GTL+ compliant host bus interface

·Integrated DRAM controller, with support for

¾+3.3 V only DIMM DRAM configurations

¾Up to two double-sided DIMMs

¾100-MHz or 66-MHz SDRAM

¾DIMM serial presence detect via SMBus interface

¾16and 64-Mbit devices with 2 KB, 4 KB, and 8 KB page sizes

¾x 4, x 8, x 16, and x 32 DRAM widths

¾SDRAM 64-bit data interface with ECC support

¾Symmetrical and asymmetrical DRAM addressing

·AGP interface

¾Complies with the AGP specification (see Section 6.2 for specification information)

¾Support for AGP 2X device

¾Synchronous coupling to the host bus frequency

·PCI bus interface

¾Complies with the PCI specification +5 V 33-MHz interface (see Section 6.2 for specification information)

¾Asynchronous coupling to the host-bus frequency

¾PCI parity generation support

17

SR440BX Motherboard Technical Product Specification

¾Data streaming support from PCI-to-DRAM

¾Support for five PCI bus masters in addition to the host and PCI-to-ISA I/O bridge

¾Support for concurrent host, AGP, and PCI transactions to main memory

·Data buffering

¾DRAM write buffer with read-around-write capability

¾Dedicated host-to-DRAM, PCI0-to-DRAM, and PCI1/AGP-to-DRAM read buffers

¾AGP dedicated inbound/outbound FIFOs, used for temporary data storage

·Power management functions

¾Support for system suspend/resume (DRAM and power-on suspend)

¾Compliant with ACPI power management

·SMBus support for desktop management functions

·Support for system management mode (SMM)

1.5.2Intel®82371EB (PIIX4E)

The PIIX4E is a multifunctional PCI device implementing the PCI-to-ISA bridge,

PCI IDE functionality, USB host/hub functionality, and enhanced power management. The PIIX4E features:

·Multifunctional PCI-to-ISA bridge

¾Support for the PCI bus at 33 MHz

¾PCI specification-compliant (see Section 6.2 for specification information)

¾Full ISA bus support

·USB controller

¾Two USB ports (see Section 6.2 for specification information)

¾Support for legacy keyboard and mouse

¾Support for Universal Host Controller Interface (UHCI) Design Guide (see Section 6.2 for specification information)

·Integrated dual-channel enhanced IDE interface

¾Support for up to four IDE devices

¾PIO Mode 4 transfers at up to 16 MB/sec

¾Support for Ultra DMA/33 synchronous DMA mode transfers at up to 33 MB/sec

¾Bus master mode with an 8 x 32-bit buffer for bus master PCI IDE burst transfers

·Enhanced DMA controller

¾Two 8237-based DMA controllers

¾Support for PCI DMA with three PC/PCI channels and distributed DMA protocols

¾Fast type-F DMA for reduced PCI bus usage

·Interrupt controller based on 82C59

¾Support for 15 interrupts

¾Programmable for edge/level sensitivity

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Motherboard Description

·Power management logic

¾Sleep/resume logic

¾Support for Wake on Ring and Wake on LAN technology

¾Support for APM and ACPI (see Section 6.2 for specification information)

·Real-Time Clock

¾256-byte battery-backed CMOS SRAM

¾Date alarm

·16-bit counters/timers based on 82C54

1.5.3USB

The motherboard has two USB ports; one USB peripheral can be connected to each port. For more than two USB devices, an external hub can be connected to either port. The two USB ports are implemented with stacked back panel I/O connectors. The motherboard fully supports UHCI and uses UHCI-compatible software drivers. See Section 6.2 for information about the USB and UHCI specifications.

·Self-identifying peripherals that can be plugged in while the computer is running

·Automatic mapping of function to driver and configuration

·Support for isochronous and asynchronous transfer types over the same set of wires

·Support for up to 127 physical devices

·Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other applications

·Error-handling and fault-recovery mechanisms built into the protocol

NOTE

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

1.5.4IDE Support

The motherboard has two independent bus-mastering IDE interfaces. These interfaces support:

·ATAPI devices (such as CD-ROM drives)

·ATA devices using the transfer modes listed in Table 62 on page 80.

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 motherboard supports laser servo (LS-120) diskette technology through its IDE interfaces. LS-120 diskette technology enables users to store 120 MB of data on a single, 3.5-inch removable diskette. LS-120 technology is backward-compatible (both read and write) with 1.44 MB and 720 KB DOS-formatted diskettes and is supported by the Windows† 95, Windows 98, and

Windows NT† operating systems. The LS-120 drive can be configured as a boot device, if selected in the BIOS Setup program.

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SR440BX Motherboard Technical Product Specification

1.5.5Real-Time Clock, CMOS SRAM, and Battery

The real-time clock is compatible with DS1287 and MC146818 components. The clock provides a time-of-day clock and a multicentury calendar with alarm features and century rollover. The realtime clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use.

A coin-cell battery 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 3.3 V 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.

The time, date, and CMOS values can be specified in the Setup program. The CMOS values can be returned to their defaults by using the Setup program.

NOTE

The recommended method of accessing the date in systems with Intel®motherboards is indirectly from the Real Time Clock (RTC) via the BIOS. The BIOS on Intel motherboards and baseboards contains a century checking and maintenance feature. This feature checks the two least significant digits of the year stored in the RTC during each BIOS request (INT 1Ah) to read the date and, if less than 80 (i.e., 1980 is the first year supported by the PC), updates the century byte to 20. This feature enables operating systems and applications using the BIOS date/time services to reliably manipulate the year as a four-digit value.

For more information on proper date access in systems with Intel motherboards, please see: http://support.intel.com/support/year2000/

1.6 I/O Controller

The FDC37M807 I/O controller from SMSC is an ISA Plug and Play-compatible, multifunctional I/O device that provides the following features (see Section 6.2 for Plug and Play information):

·Two serial ports

·Interface for one 1.2 MB, 1.44 MB, or 2.88 MB diskette drive

·Three-mode diskette drive support (driver required)

·FIFO support on both serial and diskette drive interfaces

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

·PS/2†-style mouse and keyboard interfaces

·Support for serial IRQ packet protocol

·Intelligent autopower management, including:

¾Shadowed write-only registers for ACPI compliance

¾Programmable wake up event interface

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

20

Motherboard Description

1.6.1Serial Ports

The motherboard has one 9-pin D-Sub serial port connector located on the back panel and an optional connector on the board for a second serial port. The serial ports’ NS16C550-compatible UARTs support data transfers at speeds up to 115.2 Kbits/sec with BIOS support. The serial ports can be assigned as COM1 (3F8h), COM2 (2F8h), COM3 (3E8h), or COM4 (2E8h)

1.6.2Parallel Port

The connector for the multimode bidirectional parallel port is a 25-pin D-Sub connector located on the back panel. In the Setup program, the parallel port can be configured for the following:

∙Output only

∙Bidirectional (PS/2 compatible)

∙EPP

∙ECP

1.6.3Diskette Drive Controller

The I/O controller supports a single diskette drive that is compatible with the 82077 diskette drive controller and supports both PC-AT† and PS/2 modes. In the Setup program, the diskette drive interface can be configured for the following diskette drive capacities and sizes:

∙360 KB, 5.25-inch

∙1.2 MB, 5.25-inch

∙720 KB, 3.5-inch

∙1.2 MB, 3.5-inch (driver required)

∙1.25/1.44 MB, 3.5-inch

∙2.88 MB, 3.5-inch

NOTE

The I/O controller supports 1.2 MB, 3.5-inch diskette drives, but a special driver is required for this type of drive (three-mode).

1.6.4Keyboard and Mouse Interface

PS/2 keyboard and mouse connectors are located on the back panel. The +5 V lines to these connectors are protected with a PolySwitch† circuit that, like a self-healing fuse, reestablishes the connection after an overcurrent condition is removed.

NOTE

The mouse and keyboard can be plugged into either of the PS/2 connectors. Power to the computer should be turned off before a keyboard or mouse is connected or disconnected.

The keyboard controller contains the AMI keyboard and mouse controller code, provides the keyboard and mouse control functions, and supports password protection for power on/reset. A power on/reset password can be specified in Setup.

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SR440BX Motherboard Technical Product Specification

The keyboard controller also supports the hot-key sequence <Ctrl><Alt><Del> for a software reset. This key sequence resets the computer’s software by jumping to the beginning of the BIOS code and running the Power-On Self Test (POST).

1.7 AGP Graphics Subsystem

The onboard AGP graphics subsystem supports graphics-intensive applications, such as 3D applications. AGP, while based on the PCI bus, 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 amount 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 bus efficiency

For more information on the AGP, please refer to the Accelerated Graphics Port Interface Specification listed in Section 6.2.

The graphics subsystem features the NVIDIA RIVA TNT Enhanced 128-Bit 3D Processor, 8 or 16 MB of SDRAM, and an optional video interface port (VIP).

Visit Intel’s World Wide Web (see Section 6.1) site for information about graphics drivers.

1.7.1NVIDIA RIVA TNT Graphics Controller

The NVIDIA RIVA TNT graphics controller is paired with 16 MB of SDRAM video memory and features:

∙2x AGP graphics support

∙Single pass multitexture rendering achieved by processing two pixels per clock cycle

∙Optimization for Direct3D† acceleration with complete DirectX† 5.0 and 6.0 support

∙High-performance, 128-bit 2D/GUI/DirectDraw† acceleration

∙Video acceleration for DirectShow†, MPEG-1, MPEG-2, and Indeo®video technology

∙Support for Media Port Controller (MPC) polling protocol

22

Motherboard Description

Table 2 lists the refresh rates supported by the SR440BX motherboard.

Table 2.		NVIDIA RIVA TNT Refresh Rates
				Max. Refresh Rate
	Resolution		Refresh Rates (Hz) at 8 and 16 bpp	(Hz) at 32 bpp *
	320 x 200		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240
	320 x 240		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240
	480 x 360		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240
	512 x 384		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240
	640 x 400		70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240**
	640 x 480		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240
	800 x 600		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200, 240	240
	960 x 720		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200	170
	1024 x 768		60, 70, 72, 75, 85, 100, 120, 140, 144, 150, 170, 200	150
	1152 x 864		60, 70, 72, 75, 85, 100, 120, 140, 144, 150	120
	1280 x 1024		60, 70, 72, 75, 85, 100, 120	100
	1600 x 1200		60, 70, 72, 75, 85	70
	1920 x 1080		60, 70, 72, 75	60
	1920 x 1200		60, 70, 72, 75	60

*All lower refresh rates are also supported.

**All lower refresh rates except 60 Hz are also supported.

1.7.2Video Interface Port (Optional)

The Video Interface Port (VIP) is an optional interface between video-enabled graphics controllers and one or more video devices, such as video decoders. VIP features:

·Backward compatibility with the VESA† Feature Connector

·Simplified ITU-CCIR-656 Video Format which supports horizontal (HSYNC) and vertical (VSYNC), odd and even video field

·Plug-and-play support through the graphics controller’s AGP interface

·Variable resolutions and scan rates and interlaced and non-interlaced video

·Support for Media Port Controller (MPC) polling protocol

1.8Audio Subsystem

The Audio Codec ’97 (AC ’97) compatible audio subsystem includes these features:

·Two chip split digital/analog architecture for improved S/N (signal-to-noise) ratio (³ 85 dB) measured at line out, from any analog input, including line in, CD-ROM, and auxiliary line in

·3-D stereo enhancement

Power management support for APM 1.2 and ACPI 1.0 The audio subsystem consists of these devices:

·Sound Blaster AudioPCI 64V audio controller

·Crystal Semiconductor CS4297 stereo audio codec

·Audio connectors

23

SR440BX Motherboard Technical Product Specification

1.8.1Sound Blaster AudioPCI 64V Audio Controller

·Interfaces to PCI bus as a Plug and Play device

·DOS legacy compatible

·Access to main memory (through the PCI bus) for wavetable synthesis support – does not require a separate wavetable ROM device

·PC 98 compliant

1.8.2Crystal Semiconductor CS4297 Stereo Audio Codec

·High performance 18-bit stereo full-duplex audio codec with up to 48 kHz sampling rate

·Connects to the Sound Blaster AudioPCI 64V using a five-wire digital interface

1.8.3Audio Connectors

The audio connectors include the following:

·CD-ROM (ATAPI-style and legacy-style 2 mm connectors)

·ATAPI-style connectors

¾CD-ROM audio

¾Auxiliary line in

¾Telephony

·Back panel connectors

¾Line out

¾Line in

¾Mic in

¾MIDI/Game Port

NOTE

The Line out connector, located on the back panel, is designed to power headphones or amplified speakers only. Poor audio quality may occur if passive (non-amplified) speakers are connected to this output.

1.8.3.1CD-ROM Audio Connectors

The motherboard contains two CD-ROM audio connectors to connect an internal CD-ROM drive to the audio mixer:

·A 1 x 4 legacy-style 2 mm connector

·A 1 x 4-pin ATAPI connector

NOTE

Since both CD-ROM connectors connect to the same motherboard circuitry, they should not be used simultaneously.

24

Motherboard Description

1.8.3.2Auxiliary Line In

A 1 x 4-pin ATAPI-style connector connects the left and right channel signals of an internal audio device to the audio subsystem.

1.8.3.3Telephony

A 1 x 4-pin ATAPI-style connector connects the monoaural audio signals of an internal telephony device to the audio subsystem. A monaural audio-in and audio-out signal interface is necessary for telephony applications such as speakerphones, fax/modems, and answering machines.

1.8.4Audio Drivers and Utilities

Audio software and utilities are available from Intel’s World Wide Web site (see Section 6.1)

1.9 Hardware Monitor (Optional)

The optional hardware monitor subsystem provides low-cost instrumentation capabilities. The features of the hardware monitor subsystem include:

∙Support for an optional chassis intrusion connector

∙An integrated ambient temperature sensor

∙Fan speed sensors (see Section 1.15.2 for the location of these connectors on the motherboard)

∙Power supply voltage monitoring to detect levels above or below acceptable values

When suggested ratings for temperature, fan speed, or voltage are exceeded, an interrupt is activated. The hardware monitor component connects to the SMBus.

1.10 SCSI Hard Drive LED Connector (Optional)

The optional SCSI hard drive LED connector is a 1 x 2-pin connector that allows an add-in SCSI controller to use the same LED as the IDE controller. This connector can be connected to the LED output of the add-in controller card. The LED will indicate when data is being read or written using the add-in controller. See Section 1.15.2 for the location and pinouts of the SCSI hard drive LED connector.

25

SR440BX Motherboard Technical Product Specification

1.11 Wake on LAN Technology (Optional)

Wake on LAN technology enables remote wakeup of the computer through a network. Wake on LAN technology requires a PCI add-in network interface card (NIC) with remote wakeup capabilities. The remote wakeup connector on the NIC must be connected to the motherboard Wake on LAN technology connector. The NIC monitors network traffic at the MII interface; upon detecting a Magic Packet†, the NIC asserts a wakeup signal that powers up the computer. To access this feature, use the optional Wake on LAN technology connector on the motherboard. See Section 1.15.2 for the location and pinouts of the Wake on LAN technology connector.

CAUTION

For Wake on LAN technology, the 5-V standby line for the power supply must be capable of delivering +5 V ±5 % at 720 mA. Failure to provide adequate standby current when implementing Wake on LAN technology, can damage the power supply.

1.12 Wake on Ring

Wake on Ring enables the computer to wake from sleep or soft-off mode when a call is received on a telephony device, such as a faxmodem, configured for operation on either serial port. The first incoming call powers up the computer. A second call must be made to access the computer. To access this feature use the Wake on Ring connector See Section 1.15.2 for the location and pinouts of the Wake on Ring connector.

1.13 Power Connector

When used with an ATX-compliant power supply that supports remote power on/off, the motherboard can turn off the system power through software control. See Section 6.2 for information about the microATX specification.

To enable soft-off control in software, advanced power management must be enabled in the Setup program and in the operating system. When the system BIOS receives the correct APM command from the operating system, the BIOS turns off power to the computer.

With Last State enabled in the BIOS (see Table 69), if power to the computer is interrupted by a power outage or a disconnected power cord, when power resumes, the computer returns to the power state it was in before power was interrupted (on or off).

1.14 Speaker

A 47 Ω inductive speaker is mounted on the motherboard. The speaker provides audible error code (beep code) information during the power-on self test (POST).

26

Motherboard Description

1.15 Connectors

This section describes the motherboard’s connectors. The connectors can be divided into three groups, as shown in Figure 3.

			A					A	Back panel I/O connectors
									(see Section 1.15.1)

B	B	Midboard connectors (see
		Section 1.15.2)

C

C

Front panel connectors

OM07651

(see Section 1.15.3)

Figure 3. Connector Groups

CAUTION

Only the back panel connectors of this motherboard have overcurrent protection. The internal motherboard connectors are not overcurrent protected, and should connect only to devices inside the computer chassis, such as fans and internal peripherals. Do not use these connectors for powering devices external to the computer chassis. A fault in the load presented by the external devices could cause damage to the computer, the interconnecting cable, and the external devices themselves.

27

SR440BX Motherboard Technical Product Specification

1.15.1Back Panel I/O Connectors

Figure 4 shows the location of the back panel I/O connectors.

A		F			H
	C
B	D	E	G	I	J	K
						OM07652

A	PS/2 keyboard or mouse	G	VGA
B	PS/2 keyboard or mouse	H	MIDI/Game port
C	USB port 0	I	Audio line out
D	USB port 1	J	Audio line in
E	Serial port A	K	Mic in
F	Parallel port

Figure 4. Back Panel I/O Connectors

28

Motherboard Description

Table 3. PS/2 Keyboard/Mouse Connectors

Pin Signal

1Data

2Not connected

3Ground

4Fused +5 V

5Clock

6Not connected

Table 4.		USB Stacked Connector
Pin		Signal		Pin		Signal
1		Fused +5 V		5		Fused +5 V
2		3.3 V differential USB signal USB_D–		6		3.3 V differential USB signal USB_D–
3		3.3 V differential USB signal USB_D+		7		3.3 V differential USB signal USB_D+
4		Ground	8			Ground

Table 5.		Serial Port A Connector
Pin		Signal

1DCD (Data Carrier Detect)

2SIN# (Serial Data In)

3SOUT# (Serial Data Out)

4DTR (Data Terminal Ready)

5Ground

6DSR (Data Set Ready)

7RTS (Request to Send)

8CTS (Clear to Send)

9RI (Ring Indicator)

29