Acer V50LA User manual

& K DSWHU

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System Board

System Board 1-1

The V50LA is a high-performance system board with a 64-bit

architecture. It supports the new Intel P54C, P54CQS, P54CS,

P54CT, and P55C CPUs running at 75/90/100/120/133/150 MHz and

utilizes the Peripheral Component Interconnect (PCI) local bus

architecture. The PCI local bus maximizes the system performance

by enabling high-speed peripherals to match the speed of the

microprocessor with its 120 MB or 132 MB per second transfer rate in

burst mode.

The board incorporates a Sound Blaster Pro-compatible audio

subsystem that consists of CD-audio, WaveTable, and fax/modem

line-in interfaces. A standard 1-MB video DRAM comes onboard and

is upgradable up to 2 MB. Two DRAM banks composed of four 72-pin

sockets come with the board to support single- and double-density

SIMMs for a maximum system memory of 128 MB. The SIMM

sockets accommodate both the standard page mode and extended

data output (EDO) type SIMMs. The board supports a standard 256-

KB asynchronous or an optional 256-KB pipeline burst mode second-

level cache.

The system board includes a 188-pin connector for the slot board that

contains the PCI and ISA bus slots. The two onboard PCI-enhanced

IDE interfaces with a zero-wait state and 16.6 MB per second transfer

rate support up to four IDE devices. Onboard I/O interfaces comprise

of two UART 16550 serial ports, a parallel port with ECP/EPP feature,

and PS/2 keyboard and mouse ports.

1-2 User’s Guide

1.1 Major Features

The system board has the following major features:

•A zero-insertion force (ZIF) socket for P54C, P54CTB, or

P54CS CPU

•Two DRAM banks composed of four 72-pin SIMM sockets that

support 4/8/16/32-MB 60/70ns SIMMs

•256-KB write-back asynchronous second-level cache

•128-KB boot block mode Flash ROM for system and VGA BIOS

•Two PCI-enhanced IDE interfaces that support up to four IDE

devices

•System clock/calendar with 128 bytes CMOS RAM

•Interfaces for CD-audio, fax/voice modem, and WaveTable

support

•Standard 1-MB video DRAM onboard plus two upgrade sockets

for up to 2-MB video memory

•188-pin connector for PCI/ISA slot board

•Feature socket for multimedia or Ethernet solution

•External ports:

•PS/2 keyboard and mouse ports

•Two buffered high-speed serial ports

•One ECP/EPP high-speed parallel port

•Video port

System Board 1-3

1.1.1 Layout

Figure 1-1 shows the locations of the system board major

components.

1 Second-level cache

2 Buzzer

3 CPU voltage regulator

4 Fan connector

5 SIMM sockets

6 321-pin ZIF CPU socket

7 3.3V battery

8 Video memory upgrade sockets

9 Onboard video memory

10 Video port

11 Parallel port

12 COM2

13 Slot board connector

14 COM1

15 PS/2 mouse connector

16 PS/2 keyboard connector

17 RJ-45 phone jack

18 Feature socket for multimedia

or Ethernet solution

Figure 1-1 System Board Layout

1-4 User’s Guide

1.1.2 Slot Board

The system board comes with a slot board already installed. The slot

board carries the PCI and ISA bus slots for system enhancements and

future expansion.

The slot board may vary in size and layout depending on your system

housing. Figures 1-2 and 1-3 show the two kinds of slot boards.

Figure 1-2 2-PCI/3-ISA Slot Board (for desktop systems)

Figure 1-3 3-PCI/5-ISA Slot Board

(for mini-tower systems)

System Board 1-5

1.2 Jumpers and Connectors

1.2.1 Jumper and Connector Locations

Figure 1-4 shows the jumper and connector locations on the system

board.

Figure 1-4 System Board Jumper and Connector Locations

Jumpers are prefixed “JP”. Connectors are

prefixed “CN”.

The blackened pin of a jumper represents

pin 1.

1-6 User’s Guide

1.2.2 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 Type

JP1 1-2*

2-3 For models with Acer BIOS

For models with OEM BIOS

Password Check

JP2 1-2

2-3* Check password

Bypass password

Boot Block Feature1

JP3 1-2

2-3*

(For Intel 28F001 only)

Enable Flash ROM boot block

feature

Disable Flash ROM boot block

feature

BIOS ROM Type

JP5 1-2

2-3

3-4*

EPROM

Flash ROM (Intel 28F010, 28F001)

Flash ROM (SST 29EE010)

CPU Core/Host Bus

Frequency

JP4 1-4

2-5*

3-6

75/50 MHz

90/60, 120/60, 150/60 MHz

100/66, 133/66, 167/66 MHz

Second-level Cache

JP6, JP7 1-2*,1-2* 256 KB

All other setting combinations are

reserved.

*Default setting

1The boot block feature works only for Intel 28F001 Flash ROM and requires JP5 to

be set to pins 2-3.

System Board 1-7

Table 1-1 System Board Jumper Settings (continued)

Jumper Setting Function

CPU Type

JP8 1-2*

2-3 Intel P54C or AMD K5

Cyrix M1

CPU Core / Local Bus

Clock Ratio

JP16, JP19 1-2*, 1-2*

1-2, 2-3

2-3, 1-2

2-3, 2-3

Intel P54C Intel P55C M1 and K5

3/2 3/1 3/2, 2/1, 3/1

2/1 2/1 1/1

3/1

5/2

CPU Voltage

JP21 1-2*

2-3 3.3825V for VR and standard CPU type

3.5250V for VRE CPU type

LED Support

JP23 1-2

2-3* For IDE and diskette drives

For IDE drive only

The jumpers JP10 ~ JP15 and JP17 are

always closed if there is no voltage regulator

module (VRM) present.

*Default setting

1-8 User’s Guide

1.2.3 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 Audio-I/O board connector

CN2 Fax/voice modem connector

CN4 Video feature connector

CN5 WaveTable connector

CN6 CD-audio line-in connector

CN7 Feature connector for multimedia or

Ethernet solution

CN8 IDE channel 1

CN9 IDE channel 2

CN10 Diskette drive connector

CN11 Power connector

CN12 Standby power connector

CN14 Multifunction connector

CN15 IrDA connector

CN16 Hard disk drive LED connector

CN17 Hard disk drive LED connector

(generic)

CNX1 SMM switch/Reset switch

System Board 1-9

The multifunction connector CN14 accommodates the front panel

connectors for speaker, LEDs, keylock, reset, and turbo. Figure 1-5

shows the CN14 pin assignments for each of the front panel

connectors.

Figure 1-5 20-Pin Multifunction Connector (CN14)

The connector CNX1 functions as SMM switch, as reset switch, or

both, depending on the settings. Figure 1-6 shows the CNX1 settings

with their corresponding functions.

Figure 1-6 SMM/Reset Connector (CNX1)

SMM Switch (1-2)

Reset Switch (3-4)

SMM Switch (1-2)

Reset Switch (3-4)

Front Panel

Reset Switch

1-10 User’s Guide

1.3 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.

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