Acer 930 Manuel utilisateur
ChapterChapter
11
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
2
3
8
4
5
7
10
11
12
13
14
17
16
1
6
15
19
18
20
9
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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