Acer 12000 Manual de usuario

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System Board

System Board 1-1

1.1 Features

The M21A is a dual-processor system board built on an extended ATX

baseboard utilizing two Intel Pentium II Xeon processors running at

400/100 and 450/100 MHz. It is integrated with the Intel 440GX system

controller, which consists of the PCI/AGP controller and the PCI/ISA

IDE accelerator (PIIX4E).

The Pentium II Xeon processor like its predecessor, the Pentium Pro

and Pentium II processor, implements a Dynamic Execution micro-

architecture - a unique combination of multiple branch prediction, data

flow analysis, and speculative execution. This means that the Pentium

II Xeon can deliver higher performance than the Pentium processor

while maintaining binary compatibility with all previous Intel

Architecture processors.

Also, the Pentium II Xeon processor is available in 512K, 1MB, and

2MB L2 cache options with the introduction of the Slot 2 socket.

Unlike Slot 1 Pentium IIs, which access the L2 at half the processor

speed, the Slot 2 access the L2 at full processor clock speed.

The PCI/AGP controller host bus interface supports a Pentium II Xeon

processor with 100 MHz bus frequency. It also provides a 72-bit

DIMM that supports synchronous DRAM (SDRAM) DIMMs. The

PCI/AGP controller introduces a new technology, which is the

Accelerated Graphics Port (AGP) interface. Supporting up to

533MB/sec MHz data transfer rate, the AGP interface boosts graphics

performance.

1-2 User’s Guide

The PIIX4E is a multifunctional PCI device controller implementing

system functions including PCI IDE, universal serial bus (USB)

host/hub, and enhanced power management. It also supports Ultra

DMA/33 synchronous DMA-compatible devices.

The four DIMM sockets on board allow memory upgrade to a

maximum of 2048 MB and supports 72-bit DIMM using synchronous

DRAM (SDRAM) DIMMs.

Two 16-bit fast wide Ultra-2 SCSI (Small Computer System Interface)

and an 8-bit fast narrow SCSI comes with the system board to

connect SCSI devices.

The system board also supports the USB (Universal Serial Bus)

connector, and other standard features such as two UART NS16C550

serial ports, one enhanced parallel port with Enhanced Parallel Port

(EPP)/Extended Capabilities Port (ECP) feature, a diskette drive

interface, and two embedded hard disk interfaces. The board also

includes a built-in 10/100 Mb/s Intel 82558 LAN chip that supports

Wake-On-LAN (WOL).

The system supports the power-management function that conforms

to the power-saving standards of the U.S. Environmental Protection

Agency (EPA) Energy Star program. It also offers the Plug-and-Play

feature. This feature saves the user from configuration troubles, thus

making the system more user-friendly. The system board supports two

optional features, ASM Pro and Remote Diagnostic

Management (RDM), that allow better server 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. RDM

allows execution of the RDM diagnostic program from a remote RDM

station to fix detected problems or to reboot the system.

The system is fully compatible with MS-DOS V6.X, Novell Netware,

Novel SFT III, SCO UNIX, Windows NT and Windows 95/98 operating

systems

System Board 1-3

1.2 Major Components

The system board has the following major components:

•Supports dual Intel Pentium II Xeon processors running at 400 or

450 MHz with integrated 512K, 1MB or 2MB L2 write-back cache

•Four DIMM sockets that accept 16-, 32-, 64- 128-, 256 and

512MB DIMMs with a maximum of 2048 MB system memory

•One ISA, six PCI, and one AGP bus slots (one PCI and ISA

shared slot)

•512-KB Flash ROM for system BIOS

•System clock/calendar with battery backup

•One 50-pin fast SCSI and two 68-pin Ultra2 SCSI

•I/O APIC device for SMP interrupt support

•Integrates an enhanced PCI local bus IDE controller

•Intel 440GX chipset supports AGP (Accelerated Graphics Port)

and Ultra DMA/33 functions

•10/100 Mb/s Intel 82558 LAN chip that supports Wake-On-LAN

(WOL)

•Two 24-pin RDM interfaces

•IDE hard disk and diskette drive interfaces

•Auxiliary power connector for 280W SPS and ATX power supply

•Super I/O, SCSI, memory, Advanced Server Management (ASM)

and LAN Desk Client Management (LDCM) controller chipsets

•External ports:

•USB connector •PS/2-compatible keyboard port

•RJ-45 jack •PS/2-compatible mouse port

•Parallel port •Serial port 1 and 2

1-4 User’s Guide

1.3 Layout

Figure 1-1 shows the system board components.

1 Mouse port

2 Keyboard port

3 Serial port 1

4 Parallel port

5 Serial port 2

6 USB connector

7 RJ-45

8 LAN controller

9 AGP slot

10 PCI slots

11 ISA slots

12 Intel 82371EB PIIX4E (PCI-

ISA bridge)

13 DEC 21152 (PCI-PCI bridge)

14 Buzzer

15 SCSI controller

16 Battery

17 Feature Connector (Intel SMM Card)

18 System BIOS

19 RDM connectors

20 Channel A fast/narrow SCSI

connector (50 pin)

21 Channel A Ultra-wide/Ultra-1 SCSI

connector (68 pin)

22 Channel B Ultra-wide/Ultra-1 SCSI

connector (68 pin)

23 Wide SCSI connector (68 pin)

24 EIDE connector 2 (secondary)

25 EIDE connector 1 (primary)

26 DIMM sockets

27 Intel 443GX system controller

28 Power connector 1

29 Power connector 2

30 Power connector

31 Slot 2 CPU sockets

Figure 1-1 System Board Layout

3456

System Board 1-5

1.4 Jumpers and Connectors

1.4.1 Jumper and Connector Locations

Figure 1-2 shows the jumper and connector locations on the system

board.

Figure 1-2 System Board Jumper and Connector Locations

Jumpers are prefixed “JP”. Connectors are

prefixed “CN”. The blackened pin of a jumper

or connector represents pin 1.

1-6 User’s Guide

1.4.2 Jumper Settings

Table 1-1 lists the system board jumpers with their corresponding

settings and functions.

Table 1-1 System Board Jumper Settings

Jumper Setting Function

BIOS Logo

JP3 1-2*

2-3 Acer

OEM

Password Security

JP4 1-2

2-3* Check password

Bypass password

Boot Block Mode

JP5 1-2*

2-3 Disabled

Enabled

Sound Output

JP6 1-2*

2-3 Buzzer

Speaker

AlertPack Select

JP7 1-2/4-5

2-3/5-6* AlertPack and LM80

LM80 Only

SCSI CH. B Terminator

JP11 1-2*

2-3 Enabled

Disabled

*Default

System Board 1-7

1.4.3 Connector Functions

Table 1-2 lists the different connectors on the system board and their

respective functions.

Table 1-2 Connector Functions

Connector Function

CN1 Cabinet Fan Connector

CN3 Mouse and Keyboard Ports

CN4 280W Power Supply Connector-1

CN5 280W Power Supply Connector-2

CN6 ATX Power Connector

CN7 280W Power Supply Connector-3

CN9 Modem Card Ring-in Connector

CN10 Parallel (above), Serial 1(left), and Serial 2 (right)

ports

CN11 USB Connectors

CN12 CPU1 Fan Connector

CN13 CPU2 Fan Connector

CN14 RJ-45 (LAN) Port

CN15 Fail Report LED Connector

CN16 Cabinet Fan Connector

CN17 Cabinet Fan Connector

CN18 Cabinet Fan Connector

CN20 2 Color Power LED Connector

CN22 Redundant Power Status Connector

CN23 CPU1 Temperature Connector

CN24 CPU2 Temperature Connector

CN26 PCI Sound Card Interrupt and DMA Request

Connector

CN27 Primary IDE Connector

CN28 FDD Connector

CN29 SCSI Channel B Connector

CN30 Secondary IDE Connector

1-8 User’s Guide

Table 1-2 Connector Functions

Connector Function

CN32 SCSI Channel A Wide Connector

CN33 SCSI Channel A Narrow Connector

CN34 RDM LED Connector

CN35 External Speaker Connector

CN36 Hard Disk LED Connector

CN37 Hard Disk LED Connector

CN38 Power Switch Connector

CN39/47 RDM/ASM Module Connector

CN40 Wake-on-LAN (WOL) Connector

CN42 3-pin Standard Power Connector

CN43 Hard Disk LED Connector

CN44 Reset Button Connector

CN45 Feature Connector (Intel SMM Card)

CN46 Door Switch Connector

System Board 1-9

1.5 ESD Precautions

Always observe the following electrostatic discharge (ESD)

precautions before installing a system component:

1. Do not remove a component from its antistatic packaging until

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 described in

the following sections unless you are a

qualified technician.

1-10 User’s Guide

1.6 Installing and Removing the Pentium II

Xeon Processor

Intel’s Pentium II Xeon CPU is a Slot 2 processor that uses uses a

330-pin single edge connector which is a bit longer that a Slot 1

processor. Other than the size the major improvement of the Slot 2

processor is at the L2 cache. Pentium II Xeon processors access the

L2 cache at full clock speed, 400 MHz or 450 MHz, whereas a Slot 1

processor access the L2 at only half the CPU’s clock speed. This

significantly boost performance and speed.

1.6.1 Installing the Retention Mechanism

Follow these steps to install the retention mechanism:

1. Attach both the retention mechanism with the joint bar. Snap-in

the joint bar on both sides of the retention mechanism.

Figure 1-3 Inserting the joint bar on the Retention Mechanism

2. Insert both the retention mechanism into the Slot 2 sockets. Make

sure that the shafts of the retention mechanism with a O sign is

facing the external ports of the system board.

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