Intel CN430TX User Manual

CN430TX Motherboard

Technical Product Specification

August, 1997

Order Number 677606-001

The CN430TX motherboard may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are documented in the CN430TX Motherboard Specification Update.

Revision History

Revision	Revision History	Date
-001	First release of the CN430TX Technical Product Specification.	August, 1997

This product specification applies only to standard CN430TX motherboards with BIOS identifier 4C3NT0X0.86A.

Changes to this specification will be published in the CN430TX 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 CN430TX 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 and 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 7641

Mt. Prospect IL 60056-764 or call 1-800-879-4683

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

Copyright © 1997, Intel Corporation. All rights reserved.

Contents

1 Motherboard Description

1.1	Overview ......................................................................................................................		7
1.2	Motherboard Manufacturing Options............................................................................		9
1.3	Form Factor..................................................................................................................		9
1.4	I/O Shield ...................................................................................................................		11
1.5	Microprocessor...........................................................................................................		11
	1.5.1	Microprocessor Upgrade ..............................................................................	12
1.6	Memory	......................................................................................................................	12
	1.6.1	Main Memory ...............................................................................................	12
	1.6.2 .....................................................................................	Second - level Cache	13
1.7	Chipset .......................................................................................................................		14
	1.7.1 ................................................................	430TX System Controller (MTXC)	14
	1.7.2 ........................................................	430TX PCI ISA IDE Xcelerator (PIIX4)	14
	1.7.3 .............................................................	Universal Serial Bus (USB) Support	15
	1.7.4 .................................................................................................	IDE Support	16
1.8	Super I/O ...................................................................................................Controller		17
	1.8.1 ..................................................................................................	Serial Ports	17
	1.8.2 .................................................................................................	Parallel Port	17
	1.8.3 ..........................................................................................	Floppy Controller	18
	1.8.4 ....................................................................	Keyboard and Mouse Interface	18
1.9	Graphics ..................................................................................................Subsystem		18
	1.9.1 ................................................................................	Memory Type and Size	18
	1.9.2 ...................................................................	Resolutions and Refresh Rates	18
	1.9.3 .......................................................................	Graphics Drivers and Utilities	19
1.10 Audio Subsystem .......................................................................................................			19
	1.10.1 ............................................................................Audio Drivers and Utilities		20
	1.10.2 ........................................................................................	Audio Connectors	20
1.11 Hardware .......................................................................................................Monitor			20
1.12 Motherboard ............................................................................................Connectors			21
	1.12.1 .........................................................................	Chassis Security Connector	21
	1.12.2 .............................................................................................	Fan Connector	22
	1.12.3 ........................................................................	NLX Card Edge Connectors	22
	1.12.4 ...............................................................................	Back Panel Connectors	30
1.13 Jumper .........................................................................................................Settings			34
	1.13.1 ...............................................................................................	Normal Mode	35
	1.13.2 ...........................................................................................	Configure Mode	35
	1.13.3 ............................................................................................	Recovery Mode	36
	1.13.4 ...................................................................	Processor Configuration (J4A1)	36
1.14	Reliability....................................................................................................................		37
1.15 Environmental ............................................................................................................			37

iii

	1.16 Power Consumption ...................................................................................................			37
		1.16.1	Power Supply Considerations ......................................................................	38
	1.17 Regulatory Compliance ..............................................................................................			39
		1.17.1	Product Certification Markings .....................................................................	39
2	Motherboard Resources
	2.1	Memory Map ..............................................................................................................		41
	2.2	DMA Channels ...........................................................................................................		41
	2.3	I/O Map	......................................................................................................................	42
	2.4	PCI Configuration Space Map....................................................................................		44
	2.5	Interrupts ....................................................................................................................		44
	2.6	PCI Interrupt ..........................................................................................Routing Map		45
3 Overview of BIOS Features
	3.1	Introduction ................................................................................................................		47
		3.1.1 ...............................................................	BIOS Flash Memory Organization	47
		3.1.2 ............................................................................................	BIOS Upgrades	47
		3.1.3 ........................................................	Plug and Play: PCI Auto - configuration	48
		3.1.4 ..........................................................................................	PCI IDE Support	48
		3.1.5 ........................................................................................	ISA Plug and Play	49
		3.1.6 .....................................................................................	ISA Legacy Devices	49
		3.1.7 ...................................................................	Desktop Management Interface	49
		3.1.8 ....................................................................	Advanced Power Management	50
		3.1.9 ..................................	Advanced Configuration and Power Interface (ACPI)	50
		3.1.10 .......................................................................................	Language Support	52
		3.1.11 ................................................................................................	Boot Options	52
		3.1.12 ..............................................................................	OEM Logo or Scan Area	52
		3.1.13 ................................................................................................	USB Support	52
		3.1.14 ............................................................................................	Security Screen	53
		3.1.15 .................................................................................	Recovering BIOS Data	54
	3.2	BIOS Setup .................................................................................................Program		55
		3.2.1 ......................................................................................	Maintenance Menu	55
		3.2.2 ..........................................................	Overview of the Setup Menu Screens	56
		3.2.3 ...................................................................................................	Main Menu	57
		3.2.4 ...........................................................................................	Advanced Menu	59
		3.2.5 ..............................................................................................	Security Menu	62
		3.2.6 .................................................................................................	Power Menu	63
		3.2.7 ...................................................................................................	Boot Menu	63
		3.2.8 .....................................................................................................	Exit Menu	64
4	Error Messages
	4.1	BIOS Error ................................................................................................Messages		65
	4.2	Port 80h ...............................................................................................POST Codes		66

iv

5 Specifications and Customer Support
5.1	Online Support ...........................................................................................................	73
5.2	Specifications .............................................................................................................	73
Figures
1.	Motherboard Components............................................................................................	8
2.	Motherboard Dimensions .............................................................................................	9
3.	Heatsink Keep Out Zone Dimensions ........................................................................	10
4.	Back Panel I/O Shield Dimensions.............................................................................	11
5.	Motherboard Connectors............................................................................................	21
6.	Back Panel I/O Connectors ........................................................................................	31
7.	Jumper Block Locations .............................................................................................	34
Tables
1.	S3 ViRGE/GX Resolutions and Refresh Rates ..........................................................	19
2.	Chassis Security Connector (J6A1)............................................................................	21
3.	Processor Fan Connector (J7A1) ...............................................................................	22
4.	PCI Segment, Riser Interconnect Pin-out...................................................................	23
5.	ISA Segment, Riser Interconnect Pin-out...................................................................	25
6.	IDE, Floppy, and Front Panel Section, Riser Interconnect Pin-out.............................	27
7.	Signals, NLX Riser with Supplemental Connector......................................................	29
8.	Serial Port Connectors ...............................................................................................	31
9.	PS/2 Keyboard / Mouse Connectors ..........................................................................	32
10.	Parallel Port Connector ..............................................................................................	32
11.	VGA Video Monitor Connector ...................................................................................	32
12.	Stacked USB Connectors...........................................................................................	33
13.	Audio Mic In Connector ..............................................................................................	33
14.	Audio Line Out/Headphone Connector .....................................................................	33
15.	Jumper Settings .........................................................................................................	35
16.	Jumper Settings for Processor Frequency .................................................................	36
17.	Motherboard Environmental Specifications ................................................................	37
18.	DC Voltage.................................................................................................................	38
19.	Power Usage..............................................................................................................	38
20.	Safety Regulations .....................................................................................................	39
21.	EMI Regulations.........................................................................................................	39
22.	Memory Map ..............................................................................................................	41
23.	DMA Channels ...........................................................................................................	41
24.	I/O Map ......................................................................................................................	42
25.	PCI Configuration Space Map....................................................................................	44
26.	Interrupts ....................................................................................................................	44
27.	PCI Interrupt Routing Map..........................................................................................	45
28.	Flash Memory Organization .......................................................................................	47
29.	Recommendations for Configuring an ATAPI Device.................................................	49
30.	Supported ACPI-1.0 Power States.............................................................................	51
31.	ACPI 1.0 Wake up Events..........................................................................................	51

v

32.	Supervisor and User Password Functions .................................................................	54
33.	Setup Menu Bar .........................................................................................................	55
34.	Setup Function Keys ..................................................................................................	55
35.	Maintenance Menu.....................................................................................................	55
36.	Overview of the Setup Menu Screens........................................................................	56
37.	BIOS Error Messages ................................................................................................	65
38.	Port 80h Codes ..........................................................................................................	67
39.	Compliance with Specifications ..................................................................................	73

vi

1 Motherboard Description

1.1 Overview

The CN430TX motherboard supports Pentium® processors, Pentium OverDrive® processors, and Pentium processors with MMXä technology. Features of the motherboard include the following:

·NLX form factor

·Socket 7 Pentium processor socket

Main Memory

·Two 168-pin DIMM sockets

·Support for up to 256 MB DRAM Second Level Cache Memory

·256 KB or 512 KB Pipeline Burst SRAM (PBSRAM) soldered to the motherboard

Chipset and PCI/IDE Interface

·Intel 82430TX PCIset

·Integrated PCI bus mastering controller I/O Features

·National Semiconductor PC87307 SuperI/O controller

·Integrates the following I/O functions: floppy drive interface, one multimode parallel port, two FIFO serial ports, real-time clock, keyboard and mouse controller

·Support for two Universal Serial Bus (USB) interfaces

Expansion Slots

·Riser connector supports up to three PCI slots and up to two ISA slots Audio Subsystem

·Yamaha OPL3-SA3 audio codec

Graphics Subsystem

·S3† ViRGE/GX† graphics controller Other Features

·Plug and Play compatible

·Support for Advanced Power Management (APM)

·Support for Advanced Configuration and Power Interface (ACPI)

·Hardware monitor ASIC

Software drivers and utilities are available from Intel.

7

CN430TX Motherboard Technical Product Specification

A

	U	B
		C
	T
		D
		E
		F
	S	G
	R	H
		I

Q P O N M L K J

OM06110

Figure 1. Motherboard Components

ABack panel I/O connectors

BBattery

CYamaha OPL3-SA3 audio codec

DBus frequency / BIOS recovery jumper

ENational 87307 I/O controller

F430TX PCI ISA IDE Xcelerator (PIIX4)

GNLX Riser connector

H2 Mbit Flash BIOS

I256 or 512 KB L2 PBSRAM cache

JHardware monitor ASIC

KFan connector

LChassis security connector

MSpeaker

NSocket 7 Pentium processor socket

OClock multiplier jumper

PVoltage regulator jumper

QVoltage regulator

RDIMM connectors

S430TX System Controller (MTXC)

TS3 ViRGE/GX graphics controller

USGRAM video memory

8

Motherboard Description

1.2 Motherboard Manufacturing Options

Motherboard manufacturing includes the following option - 256 or 512 KB PBSRAM second-level cache (L2) soldered onto the motherboard.

1.3 Form Factor

The motherboard is designed to fit into an NLX form factor chassis. Figure 2 illustrates the mechanical form factor for the motherboard. Location of the I/O connectors, riser slot, and mounting holes is in compliance with the NLX specification (see Section 5.2).

			6.05
	9.80
	8.70
	6.225
	0.00
	0.20
	0.45		7.80
		3.40	7.34
	0.00
			OM06111

Figure 2. Motherboard Dimensions

9

CN430TX Motherboard Technical Product Specification

Figure 3 specifies the dimensions of the heatsink keep out zone.

NOTE

Processor heatsinks used with this motherboard may interfere with add-in cards in the lower NLX riser card slot. This is a deviation from the NLX specification keepout zone C. The actual encroachment is 1.870 inches wide and 0.613 inches deep as shown in Figure 3. The total height of the processor socket, the microprocessor, and the heatsink must be no higher than 0.8 inches above the motherboard plane in order to avoid interference in this zone.

0.613

1.870

OM06336

Figure 3. Heatsink Keep Out Zone Dimensions

10

Motherboard Description

1.4 I/O Shield

The back panel I/O shield for the motherboard must meet specific dimensional and material requirements. Computers built with this motherboard need the I/O shield to pass EMI certification testing. Figure 4 shows the critical dimensions for the I/O shield and indicates the position of each cutout. For more chassis design requirements, see the NLX specification.

0.168

0.570

1.175

1.838

2.504

3.179

4.532

7.274

			0.543					1.752
			0.208
	0.948							1.197
	0.530
	0.456							0.447
	0.00							0.143
	0.00	0.456		4.637	5.997	7.429	7.908	8.853
		0.366(2)	0.490(2)
								OM06463

Figure 4. Back Panel I/O Shield Dimensions

1.5 Microprocessor

The motherboard supports the following:

∙Pentium processors with MMX technology operating at 166, 200, and 233 MHz.

∙Pentium processors operating at 90, 100, 120, 133, 150, 166, and 200 MHz.

An onboard voltage regulator derives the necessary voltage from the computer's power supply. For Pentium processors, a jumper enables the use of VR-, or VRE-specified processors. For Pentium processors with MMX technology, the required voltage is automatically detected by onboard circuitry. There are no separate or additional jumpering requirements for Pentium processors with MMX technology.

CAUTION

If you use clips to secure a heat sink to the processor, do not use bail-wire style heat sink clips. These clips have been known to damage the motherboard when installed or removed incorrectly. The figure to the right shows an example of the bail-wire style heat sink clip.

OM0 55 5 4

11

CN430TX Motherboard Technical Product Specification

1.5.1Microprocessor Upgrade

The motherboard has a 321-pin Socket 7 zero insertion force (ZIF) microprocessor socket. Socket 7 supports upgrades to higher performance Pentium OverDrive processors.

1.6 Memory

1.6.1Main Memory

The motherboard has two Dual Inline Memory Module (DIMM) sockets. Memory can be installed in one or two sockets. The minimum memory size is 8 MB, and the maximum is 256 MB. The BIOS automatically detects memory type, size, and speed so no jumper settings are required.

The motherboard supports the following:

∙168-pin 3.3 V DIMMs with gold-plated contacts

∙60 and 66 MHz bus speeds

∙60 ns 3.3 V unbuffered EDO memory

∙60 ns CAS Latency 2 unbuffered 4-clock 3.3 V SDRAM

∙Caching for the first 64 MB of main memory

∙64-bit data path

∙Singleor double-sided DIMMs in the following sizes:

DIMM Size	Type	Configuration	Technology
8 MB	60 ns EDO	1M x 64	16 Mbit
16 MB	60 ns EDO	2M x 64	16 Mbit
32 MB	60 ns EDO	4M x 64	16 Mbit
64 MB	60 ns EDO	8M x 64	16 Mbit
128 MB	60 ns EDO	16M x 64	64 Mbit
8 MB	CAS Latency 2 SDRAM	1M x 64	16 Mbit
16 MB	CAS Latency 2 SDRAM	2M x 64	16 Mbit
32 MB	CAS Latency 2 SDRAM	4M x 64	16 Mbit
64 MB	CAS Latency 2 SDRAM	8M x 64	64 Mbit
128 MB	CAS Latency 2 SDRAM	16M x 64	64 Mbit

Memory type, size, and speed can vary between sockets so EDO and SDRAM memory can be installed on the same motherboard. Parity (x 72) DIMMs are not recommended because the motherboard does not provide parity checking or ECC functionality.

12

Motherboard Description

1.6.1.1EDO DRAM

EDO DRAM improves memory read performance by holding the memory data valid until the next CAS# falling edge. With EDO DRAM, the CAS# precharge overlaps the data-valid time, which allows CAS# to negate earlier while still satisfying the memory data-valid window. EDO DIMMs must meet the Intel EDO DRAM DIMM v1.2 Specification.

NOTE

Due to loading anomalies, using SDRAM DIMMs with a n x 4 DRAM base are not supported. For example, a DIMM that uses sixteen 16 Mbit x 4 devices should not be used.

1.6.1.2SDRAM

Synchronous DRAM (SDRAM) improves memory performance. Unlike EDO memory, SDRAM is synchronous with the memory clock. This simplifies the timing design and increases memory speed because all timing is dependent on the number of memory clock cycles. To function correctly, SDRAM DIMMs must meet the Intel 4-clock 66 MHz 64-bit unbuffered SDRAM DIMM v1.0 Specification.

NOTE

Due to loading anomalies, using SDRAM DIMMs with a n x 4 DRAM base are not supported. For example, a DIMM that uses sixteen 16 Mbit x 4 devices should not be used.

NOTE

The board supports unbuffered, 4-clock 3.3 V SDRAM DIMMs only. Buffered, 5 V, or 2-clock SDRAM DIMMs cannot be used.

1.6.2Second-level Cache

The 512 KB direct-mapped write-back L2 cache consists of two 64 Kbit x 32 global write enable (GWE) Pipeline PBSRAM devices soldered to the motherboard. A 32 Kbit x 8 external Tag SRAM provides caching support for up to 64 MB of main memory.

The 256KB L2 cache substitutes two 32 Kbit x 32 PBSRAMs and an 8 Kbit x 8 external Tag SRAM.

13

CN430TX Motherboard Technical Product Specification

1.7 Chipset

The Intel 82430TX PCIset consists of the TX System Controller (MTXC) device and the PCI ISA IDE Xcelerator (PIIX4) device.

1.7.1430TX System Controller (MTXC)

The MTXC integrates the cache and main memory DRAM control functions and provides bus control to handle transfers between the processor, cache, main memory, and the PCI bus. The MTXC allows PCI masters to achieve full PCI bandwidth by using the snoop ahead feature. For increased system performance the MTXC integrates posted write and read prefetch buffers. The MTXC features include:

·Microprocessor interface control

·Integrated L2 write-back cache controller

¾Supports pipeline burst SRAM

¾64 MB maximum DRAM cacheability

¾Direct mapped organization—write back only

¾Cache hit read/write cycle timings at 3-1-1-1

¾Back to back read/write cycles at 3-1-1-1-1-1-1-1

·Integrated DRAM controller

¾8 MB to 256 MB main memory

¾64-Mbit DRAM/SDRAM technology support

¾3.3 V EDO and unbuffered synchronous DRAM support

¾Non-parity (x64) support only

·Fully synchronous minimum latency PCI bus interface

¾PCI compliance (see Section 5.2 for compliance level)

¾30 and 33 MHz bus speeds

¾PCI to DRAM data throughput or greater than 100 MB/sec

¾Up to four PCI masters in addition to the PIIX4

·Power management control

¾Provides PCI CLKRUN# signal to control memory clock on the PCI bus (on/off)

¾Internal clock control (gated off if no host or PCI bus activity)

1.7.2430TX PCI ISA IDE Xcelerator (PIIX4)

The Intel 430TX PCI ISA IDE Xcelerator (PIIX4) is a multifunction PCI device implementing a PCI to ISA bridge, PCI IDE functionality, a Universal Serial Bus (USB) host/hub function, and Enhanced Power Management. The PIIX4 features include:

·Multifunction PCI to ISA bridge

¾Supports the PCI bus at 30 and 33 MHz

¾PCI compliant (see Section 5.2 for compliance level)

¾Full ISA or extended I/O (EIO) bus support

14

Motherboard Description

·USB controller

¾Two USB ports (see Section 5.2 for compliance level)

¾Supports legacy keyboard and mouse

¾Supports UHCI design guide revision 1.1 interface

·Integrated dual-channel enhanced IDE interface

¾Support for up to four IDE devices

¾PIO Mode 4 transfers at up to 14 MB/sec

¾Supports “Ultra DMA/33” synchronous DMA mode transfers up to 33 MB/sec

¾Integrated 8 x 32-bit buffer for bus master PCI IDE burst transfers

¾Bus master mode

·Enhanced DMA controller

¾Two 8237-based DMA controllers

¾Supports 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

·Power management logic

¾Sleep/resume logic

¾Supports thermal alarm

¾Support for Wake On Modem through Ring Indicate input

¾Support for Wake on LAN† through LID input

·Real-Time Clock

¾256 byte battery-backed CMOS SRAM

¾Includes date alarm

·16-bit counters/timers based on 82C54

1.7.3Universal Serial Bus (USB) Support

The motherboard features two USB ports. The ports permit the direct connection of two USB peripherals without an external hub. If more devices are required, an external hub can be connected to either of the built-in ports. The motherboard fully supports the standard universal host controller interface (UHCI) and uses standard software drivers that are UHCI-compatible. Features of the USB include:

·Self-identifying, hot pluggable peripherals

·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 protocol

15

CN430TX Motherboard Technical Product Specification

NOTE

Computers that have an unshielded cable attached to the USB port might 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.

NOTE

Advanced Power Management will not function as expected when a USB keyboard or mouse is used. USB activity is not monitored by the APM event counter, therefore, activity from a USB keyboard or mouse will not keep the system awake or bring a system out of APM sleep mode. If a USB keyboard or mouse is being used, APM should be disabled.

1.7.4IDE Support

The motherboard has two independent bus mastering PCI IDE interfaces that support PIO Mode 3, PIO Mode 4, ATA-33 (Ultra DMA-33), and ATAPI (e.g., CD-ROM) devices. The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes.

IDE device transfer rate and translation mode are automatically detected by the BIOS.

Normally, programmed I/O operations require a substantial amount of processor bandwidth; however, in multi-tasking operating systems like Windows† 95, the bandwidth freed by bus mastering IDE can be devoted to other tasks while disk transfers are occurring.

1.7.4.1LS-120 Support

LS-120 MB Diskette technology enables users to store 120 MB of data on a single, 3.5-inch removable diskette. LS-120 technology is backward (both read and write) compatible with 1.44 MB and 720 KB DOS-formatted diskettes and is supported by Windows 95 and Windows NT† operating systems.

The motherboard allows connection of an LS-120 compatible drive and a standard 3.5-inch diskette drive. The LS-120 drive can be configured as a boot device, if selected in the BIOS setup utility.

NOTE

If you connect an LS-120 drive to an IDE connector and configure it as the "A" drive and configure a standard 3.5-inch floppy as a "B" drive, the standard floppy must be connected to the floppy drive cable's "A" connector (the connector at the end of the cable).

16

Motherboard Description

1.8 Super I/O Controller

The PC87307VUL Super I/O Controller from National Semiconductor is an ISA Plug and Play compatible (see Section 5.2 for compliance level), multifunction I/O device that provides the following features:

·Serial ports:

¾Two 16450/16550A-software compatible UARTs

¾Send/receive 16-byte FIFO

¾Four 8-bit DMA options for the UART with Slow Infrared Support (USI)

¾Ring indicator support for both serial ports

·Multimode bi-directional parallel port

¾Standard mode, IBM and Centronics compatible

¾Enhanced Parallel Port (EPP) mode with BIOS and driver support

¾High-speed Extended Capabilities Port (ECP) mode

·Floppy disk controller

¾DP8473 and N82077 compatible

¾16 byte FIFO

¾PS/2† diagnostic register support

¾CMOS disk input and output logic

¾High performance digital data separator (DDS)

¾PC-AT† and PS/2 drive mode support

·Keyboard and mouse controller

¾Industry standard 8042A compatible

¾General purpose microcontroller

¾8 bit internal data bus

·Support for an IrDA† and Consumer IR-compliant infrared interface

By default, the I/O controller interfaces are automatically configured during boot up. The I/O controller can also be manually configured in the Setup program.

1.8.1Serial Ports

The 16450/16550A compatible UART’s support data transfers at speeds up to 115.2 Kbaud with BIOS serial port support. The ports are implemented with two 9-pin D-Sub serial port connectors located on the back panel.

1.8.2Parallel Port

The motherboard supports one multimode bi-directional parallel port. The port is implemented with a one 25-pin D-Sub connector located on the back panel. In the Setup program, there are four options for parallel port operation:

·Compatible (standard mode)

·Bi-directional (PS/2 compatible)

·Bi-directional Enhanced Parallel Port (EPP)

·Bi-directional Extended Capabilities Port (ECP)

17

CN430TX Motherboard Technical Product Specification

1.8.3Floppy Controller

The I/O controller is software compatible with the DP8473 and N82077 floppy drive controllers and supports both PC-AT and PS/2 modes. The floppy interface can be configured for the following floppy 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

1.8.4Keyboard and Mouse Interface

NOTE

The mouse and keyboard can be plugged into either of the PS/2 connectors.

The keyboard controller contains keyboard and mouse controller code from American Megatrends Incorporated (AMI). The code provides the traditional keyboard and mouse control functions, including Power On/Reset password protection. A password can be specified in the Setup program.

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

1.9 Graphics Subsystem

The onboard graphics subsystem uses the S3 ViRGE/GX graphics controller, with the following features:

∙3-D graphics capability

∙SGRAM-based chip optimized for synchronous operation

∙64-bit graphics engine with accelerator core

∙170 MHz 24-bit RAMDAC/clock synthesizer

∙Dual programmable clock generators

∙DCI-based linear addressing scheme

∙S3 Streams Processor provides high video playback quality

1.9.1Memory Type and Size

The controller is supported by 2 MB of SGRAM soldered to the motherboard.

18

Motherboard Description

1.9.2Resolutions and Refresh Rates

Table 1.	S3 ViRGE/GX Resolutions and Refresh Rates
			Refresh Rate (Hz) At:
		4-bit Color	8-bit Color	15/16-bit Color	24-bit Color
Resolution		(16 Colors)	(256 Colors)	(32K/64K Colors)	(16M Colors)
640 x 480		60	60, 70, 72, 75, 85	60, 72, 75, 85	60, 72, 75, 85
800 x 600		56, 60, 72, 75, 85	56, 60, 72, 75, 85	56, 60, 72, 75, 85	56, 60, 72, 75, 85
1024 x 768		43(IL), 60, 70, 75, 85	43(IL), 60 ,70, 75, 85	43(IL), 60, 70, 75, 85	not supported
1152 x 864		not supported	60	not supported	not supported
1280 x 1024		43(IL), 60, 75, 80	43(IL), 60, 75, 85	not supported	not supported
1600 x 1200		not supported	48.5(IL), 60	not supported	not supported

IL = Interlaced

1.9.3Graphics Drivers and Utilities

Graphics drivers and common graphics utilities are available for Windows 3.x, Windows 95, and Windows NT. Drivers and utilities are available from Intel’s World Wide Web site (see

Section 5.1).

1.10 Audio Subsystem

The onboard audio subsystem features the Yamaha OPL3-SA3 audio codec. The chip integrates a 16-bit audio codec, OPL3 FM synthesis and its DAC, 3-D enhanced stereo controller, and an interface for MPU-401 and a joystick. The chip provides all the digital audio and analog mixing functions needed for recording and playing sound. Features of the chip include the following:

∙Integrated 3-D enhanced stereo controller including all required analog components

∙Stereo analog-to-digital and digital-to-analog converters

∙Analog mixing, anti-aliasing, and reconstruction filters

∙Support for 16-bit address decode

∙ADPCM, A-law, or μlaw digital audio compression/decompression

∙Full digital control of all mixer and volume control functions

∙Plug and Play compatibility

∙Sound Blaster† and Windows Sound System compatibility

19

CN430TX Motherboard Technical Product Specification

The following table shows the IRQ, DMA channel, and base I/O address options for the audio subsystem. These options are automatically chosen by the Plug and Play interface, so there are no default settings.

Resource	IRQ (Options)	DMA Channel (Options)	I/O Address (Options)
Sound Blaster	5	0	220h
(DMA playback, DMA shared with	7	1	240h
Windows Sound System capture)	9	3	220-280h
	10
	11
Windows Sound System	5	0	530h
(DMA playback)	7	1	E80h
	9	3	530-F48h
	10
	11
MPU-401			330h
(IRQ shared with Sound Blaster)			300h
			300-334h
MIDI / Game Port			201h
			201-211h
AdLib†			388h
			388-3F8h

Note: The MIDI/Game Port feature is not implemented.

1.10.1Audio Drivers and Utilities

Audio software and utilities are available from Intel’s World Wide Web site (see Section 5.1).

1.10.2Audio Connectors

The motherboard has Mic In and Line Out connectors on the back panel.

1.11 Hardware Monitor

The hardware monitor component (National Semiconductor LM78) provides low-cost instrumentation capabilities designed to reduce the total cost of owning a PC when used with LANDesk® Client Manager. The hardware implementation is a single-chip ASIC. Features include:

∙An integrated ambient temperature sensor

∙Fan speed sensors

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

∙Registers for storing POST hardware test results and error codes

∙Remote reset capabilities from a remote peer or server through LANDesk Client Manager, Version 3.0 and service layers (when available)

When suggested ratings for temperature, fan speed, or voltage are exceeded, an interrupt is activated. The hardware monitor component (LM78) connects to the ISA bus as an 8-bit I/O mapped device.

20

Motherboard Description

1.12 Motherboard Connectors

Figure 5 shows the connectors on the motherboard.

Supplemental

Connector

Bank 0

Bank 1

	Riser
DIMM Sockets(2)	Connector

J1D1, J1D2

	J6A1	J7A1
Chassis
		Fan
Security
		Connector
Connector
	1
		1

OM06114

Figure 5. Motherboard Connectors

1.12.1Chassis Security Connector

A 1 x 2-pin connector that supports an intrusion switch (or alarm) on the chassis.

Table 2. Chassis Security Connector (J6A1)

Pin	Signal Name

1Ground

2CHS_SEC

21

CN430TX Motherboard Technical Product Specification

1.12.2Fan Connector

A 1 x 3-pin fan connector can support a processor or chassis fan. Pin 3 on the connector can be used to implement a sensor that monitors fan operation.

Table 3.	Processor Fan Connector (J7A1)
Pin		Signal Name
1		Ground
2		+12 V
3		Fan_sense (tachometer)

1.12.3NLX Card Edge Connectors

The NLX motherboard connects to the riser with a 340 pin (2x170) pin, 1mm pitch, card edge connector. The pin-out for the riser interconnect is shown below. The “A” side is the bottom (secondary) side of the motherboard, and the “B” side is the top (primary) side of the motherboard. Pin 1 is toward the back of the motherboard (back panel I/O connectors). In addition, there is a 26 pin (2x13) supplemental gold finger contact. According to the NLX specification, the riser must provide signals for the following:

∙PCI expansion slots

∙ISA expansion slots

∙IDE headers

∙1 floppy drive header

∙Miscellaneous front panel signals

For power requirements, see Section 1.16.

Table 4, Table 5, and Table 6 specify the pinouts located on the primary connector; Table 7 specifies the pinouts located on the supplemental connector. All edge connector pin definitions are defined in the NLX specification, version 1.2.

22

Motherboard Description

Table 4. PCI Segment, Riser Interconnect Pin-out

Pin#	Signal Name	Type	I/O	Termination	Pin	Signal Name	Type	I/O	Termination
A1	-12V	PWR	NA	NA	B1	PCSPKR_RT	AUDIO	O	NA
A2	REQ4#	PCI	I	RIS	B2	+12V	PWR	NA	NA
A3	+12V	PWR	NA	NA	B3	PCSPKR_LFT	AUDIO	O	NA
A4	GNT4#	PCI	O	RIS	B4	+12V	PWR	NA	NA
A5	3.3VDC	PWR	NA	NA	B5	PCICLK0	PCI	O	MB
A6	PCIINT3#	PCI	I	RIS	B6	GND	PWR	NA	NA
A7	3.3VDC	PWR	NA	NA	B7	PCICLK1	PCI	O	MB
A8	PCIINT0#	PCI	I	RIS	B8	SER_IRQ	MISC	I/O	MB
A9	PCIINT1#	PCI	I	RIS	B9	PCIINT2#	PCI	I	RIS
A10	PCICLK2	PCI	O	MB	B10	3.3VDC	PWR	NA	NA
A11	3.3VDC	PWR	NA	NA	B11	PCICLK3	PCI	O	MB
A12	PCI_RST#	PCI	O	MB	B12	GND	PWR	NA	NA
A13	GNT0#	PCI	O	RIS	B13	GNT3#	PCI	O	RIS
A14	PCICLK4	PCI	O	MB	B14	3.3VDC	PWR	NA	NA
A15	GND	PWR	NA	NA	B15	GNT2#	PCI	O	RIS
A16	GNT1#	PCI	O	RIS	B16	AD[31]	PCI	I/O	RIS
A17	3.3VDC	PWR	NA	NA	B17	REQ0#	PCI	I	RIS
A18	REQ2#	PCI	I	RIS	B18	GND	PWR	NA	NA
A19	REQ3#	PCI	I	RIS	B19	AD[29]	PCI	I/O	RIS
A20	AD[30]	PCI	I/O	RIS	B20	AD[28]	PCI	I/O	RIS
A21	GND	PWR	NA	NA	B21	AD[26]	PCI	I/O	RIS
A22	AD[25]	PCI	I/O	RIS	B22	3.3VDC	PWR	NA	NA
A23	REQ1#	PCI	I	RIS	B23	AD[24]	PCI	I/O	RIS
A24	AD[27]	PCI	I/O	RIS	B24	C/BE[3]#	PCI	I/O	RIS
A25	3.3VDC	PWR	NA	NA	B25	AD[22]	PCI	I/O	RIS
A26	AD[23]	PCI	I/O	RIS	B26	GND	PWR	NA	NA
A27	AD[20]	PCI	I/O	RIS	B27	AD[21]	PCI	I/O	RIS
A28	AD[18]	PCI	I/O	RIS	B28	AD[19]	PCI	I/O	RIS
A29	GND	PWR	NA	NA	B29	AD[16]	PCI	I/O	RIS
A30	AD[17]	PCI	I/O	RIS	B30	3.3VDC	PWR	NA	NA
A31	IRDY#	PCI	I/O	RIS	B31	C/BE[2]#	PCI	I/O	RIS
A32	DEVSEL#	PCI	I/O	RIS	B32	FRAME#	PCI	I/O	RIS
A33	3.3VDC	PWR	NA	NA	B33	TRDY#	PCI	I/O	RIS
A34	STOP#	PCI	I/O	RIS	B34	GND	PWR	NA	NA
A35	PERR#	PCI	I/O	RIS	B35	SDONE	PCI	I/O	RIS
A36	SERR#	PCI	I/O	RIS	B36	LOCK#	PCI	I/O	RIS
A37	GND	PWR	NA	NA	B37	SBO#	PCI	I/O	RIS

continued

23