Acer 930 Manuel utilisateur

ChapterChapter

System Board

System Board 1-1

1.1 Features

This high-performance system board supports the Intel Pentium II CPU

running at 233/266/300 MHz. Designed to work with Intel 440LX system

controller, which consists of the PCI/AGP controller (PAC) and the PCI/ISA

IDE accelerator (PIIX4), the CPU carries a new generation of power.

The PAC host bus interface supports up to two Pentium II processors with

66 MHz bus frequency. It also provides a 72-bit DRAM support using both

extended data output (EDO) and synchronous DRAM (SDRAM) DIMMs.

The PAC introduces a new technology, which is the Accelerated Graphics

Port (AGP) interface. Supporting up to 133 MHz data transfer rate, the

AGP interface boosts graphics performance.

The PIIX4 is a multifunction PCI device controller implementing system

functions including PCI-to-PCI bridge, PCI IDE, universal serial bus (USB)

host/hub, and enhance power management. It also supports Ultra DMA/33

synchronous DMA-compatible devices.

The system board utilizes both the ISA and the PCI local bus architecture.

Two ISA and four PCI bus slots (including one PCI/ISA shared slot) reside

on the board to allow installation of either master or slave devices.

Four memory banks composed of 168-pin dual inline memory module

(DIMM) sockets support a maximum system memory of 512 MB using

128-MB DIMMs. The sockets support both EDO and SDRAM-type

DIMMs.

A 50-pin Fast SCSI-II and a 68-pin Wide SCSI interface come with the

system board to connect SCSI devices. Standard I/O features such as two

enhanced IDE drive interfaces, two serial interfaces, one parallel port

interface, a diskette drive interface, and PS/2 mouse and keyboard

connectors reside on the system board.

The system board supports two optional features, the ASM Pro and the

remote diagnostic management (RDM), that allow better server

1-2User’s Guide

management. The ASM Pro detects problems in CPU thermal condition,

CPU working voltage detection (±12V/±5V/3.3V/1.5V), and PCI bus

utilization calculation. It also detects if the CPU fan or the chassis fan

malfunctions. The RDM allows execution of the RDM diagnostic program

from a remote RDM station to fix detected problems or to reboot the system.

System Board 1-3

1.2 Major Components

The system board has the following major components:

• Exclusive slots for two Intel Pentium II processors

• Memory banks (Bank 0 to Bank 3) composed of four 168-pin DIMM

sockets

• Two ISA and four PCI expansion slots (including one PCI/ISA shared

slot)

• 256-KB Flash ROM for system BIOS

• 50-pin Fast SCSI-II and 68-pin Wide SCSI interfaces

• RDM connectors

• ASM controller chipset

• Enhanced IDE hard disk and diskette drive interfaces

• Power connector for 250-watt switching power supply

• System controller chipsets

• External ports:

• USB connector

• Parallel port

• Serial port 1

• Serial port 2

• PS/2-compatible keyboard port

• PS/2-compatible mouse port

1-4User’s Guide

1.2.1 System Board Layout

1 DIMM sockets

2 Pentium II CPU slot 1

3 Pentium II CPU slot 2

4 Accelerated graphics port (AGP)

interface slot

5 Primary IDE connector

6 Secondary IDE connector

7 RDM connectors

8 Battery

9 Narrow SCSI connector

10 Wide SCSI connector

11 ISA slots

12 PCI slots

13 BIOS

14 Diskette drive connector

15 PS/2 keyboard port

16 PS/2 mouse port

17 Serial port 1

18 Parallel port

19 Serial port 2

20 USB connector

Figure 1-1 System Board Layout

System Board 1-5

1.3 Jumpers and Connectors

1.3.1 Jumper and Connector Locations

Figure 1-2 shows the jumper locations on the system board. The blackened

pin on a jumper represents pin 1.

Figure 1-2 Jumper and Connector Locations

The blackened pin of a jumper or connector

represents pin 1.

1-6User’s Guide

1.3.2 Jumper Settings

Table 1-1 Jumper Settings

Jumper Setting Function

S/W Power Down for

420W SPS

JP1 1-2*

2-3 Enabled

Disabled

ITP JP3, JP4

JP3 JP4

1-2, 1-2

2-3*, 1-2*

2-3, 2-3

CPU1

Dual CPU

CPU 2

External Clock

JP6 1-2, 4-5*

2-3, 5-6 66 MHz

60 MHz

BIOS JP8 1-2*

2-3 Acer

OEM

Password Security

JP9 1-2

2-3* Check password

Bypass password

Sound Output

JP11 1-2*

2-3 Buzzer

Speaker

SCSI Termination

JP12 1-2*

2-3 Terminator set to ON

SCSI terminator set to ON or OFF

by software

*Default setting

System Board 1-7

Table 1-2 lists the CPU core over bus frequency ratios depending on JP5

settings.

Table 1-2 JP5 Settings for CPU Core/Bus Frequency Ratio

JP5 Settings CPU Core /

1-2 3-4 5-6 7-8 Bus Freq. Ratio

Closed Closed Closed Closed 2

Closed Closed Open Closed 3

Closed Closed Closed Open 4

Closed Open Closed Closed 5/2

Closed Open Open Closed 7/2

Open Open Open Open 2/1

Closed Open Closed Open 9/2

1-8User’s Guide

1.3.3 Connector Functions

Table 1-3 lists the different connectors on the system board and their

respective functions.

Table 1-3 Connector Functions

Connector Function

CN1 250W power control connector

CN2 420W power control connector

CN3 Housing fan connector 1

CN4 Housing fan connector 2

CN5 Backplane hard disk LED connector

CN6 10-pin power connector

CN7 USB connector

CN9 CPU1 fan connector

CN10 CPU1 thermal sensor connector

CN11 Upper: Parallel port

Lower: Serial ports

CN12 250W power supply control connector

CN14 Hard disk LED connector

CN15 Upper: PS/2 keyboard connector

Lower: PS/2 mouse connector

CN16 CPU 2 fan connector

CN17 CPU2 thermal sensor connector

CN18 Diskette drive connector

CN19 Power switch

CN20 Housing fan connector 3

CN21 Enhanced IDE 1 connector

CN22 Power LED connector

CN23 Enhanced IDE 2 connector

CN24 Reset connector

System Board 1-9

Table 1-3 Connector Functions (continued)

Connector Function

CN25, CN28 RDM connectors

CN26 Redundant power status connector

CN27 Wake up ON LAN connector

CN29 Feature connector (for Intel SMM)

CN30 Narrow SCSI connector

CN32 Wide SCSI connector

CN33 Speaker connector

CN31 Housing door connector

1.4 ESD Precautions

Always observe the following ESD (electrostatic discharge) precautions

before installing any system component:

1. Do not remove any system component from its packaging unless you

are ready to install it.

2. Wear a wrist grounding strap before handling electronic components.

Wrist grounding straps are available at most electronic component

stores. DO NOT attempt the procedures in the following

sections unless you are confident of your

capability to perform them. Otherwise, ask a

service technician for assistance.

1-10 User’s Guide

1.5 Installing the Processor Heat Sink

and Fan

The Pentium II processor module comes with holes on one side to hold the

clips of the heat sink and fan. The upper set of holes (near the latches) on

the processor are wider and should match the wider ends of the clips on the

heat sink. The lower set of holes are smaller and should match the narrow

ends of the heat sink clips.

Figure 1-3 Matching the Fan-Heat Sink Clips with the Holes on the

Processor

Wide Holes

Narrow Holes

Wide Clip Ends

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