AOpen DX6G Plus User manual

C h a p t e r
1
System Board
System Board 1-1
1.1 Features
The DX6G Plus is a dual-processor system board built on an
extended ATX baseboard utilizing two Pentium®II processors running
at 400/100 and 450/100 MHz or two Pentium®III processors running
at 500/100 and 550/100 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 and Pentium®III processor implements a Dynamic
Execution micro-architecture - a unique combination of multiple
branch prediction, data flow analysis, and speculative execution. This
means that it can deliver higher performance than the previous
Pentium®processor while maintaining binary compatibility with all
previous Intel Architecture processors.
The PCI/AGP controller host bus interface supports both Pentium®II
and Pentium®III 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.
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.

1-2User’s Guide
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 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 support Intel
LDCM© (LAN Desktop Client Manager) which will detect problems in
CPU thermal condition, CPU working voltage, CPU fan and the
chassis fan malfunctions. It also provides remote monitoring features.
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 Pentium®II processors running at 400 or 450
MHz, Pentium®III processors running at 500 or 550 MHz, and
future generations Pentium CPUs.
•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)
•IDE hard disk and diskette drive interfaces
•Auxiliary power connector for 337W SPS (Optional) and 350W
ATX power supply
•Super I/O, SCSI, memory, 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

1-4User’s Guide
1.3 Layout
1 Mouse port
2 Keyboard port
3 Serial port 2
4 Parallel port
5 Serial port 1
6 USB connector
7 RJ-45
8 LAN controller
9 AGP slot
10 PCI slots
11 ISA slot
12 Intel 82371EB PIIX4E (PCI-
ISA bridge)
13 DEC 21152 (PCI-PCI bridge)
14 Buzzer
15 SCSI controller
16 Battery
17 System BIOS
18 RDM connectors
19 Channel 1 Ultra-wide/Ultra-2 SCSI
connector (68 pin)
20 Channel 2 Ultra-wide/Ultra-2 SCSI
connector (68 pin)
21 Channel 2 fast/narrow SCSI
connector (50 pin)
22 FDD connector
23 EIDE connector 2 (secondary)
24 EIDE connector 1 (primary)
25 DIMM sockets
26 Intel 443GX system controller
27 Power connector 1
28 Power connector 2
29 Power connector 3
30 Slot 1 CPU sockets
1
2
3456
7
8
10
11
13
12
14
15
16
18
19
20
21
22
26
30
27
28
29
24
23
25
17
9

System Board 1-5
1.4 Jumpers and Connectors
1.4.1 Jumper and Connector Locations
Jumpers are prefixed P”. Connectors are
prefixed N”. The blackened pin of a
jumper or connector represents pin 1.

1-6User’s Guide
1.4.2 Jumper Settings
The table below lists the system board jumpers with their
corresponding settings and functions.
Jumper Setting Function
BIOS Logo
JP3 1-2*
2-3 Logo
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
Speakers
SCSI Channel 1Terminator
JP11 1-2*
2-3 Enabled
Disabled
AlertPack Select
JP7 1-2 / 4-5
2-3 / 5-6* AlertPack and LM80
LM80 only
*Default

System Board 1-7
1.4.3 Connector Functions
The table below lists the different connectors on the system board and
their respective functions.
Connector Function
CN1 Cabinet Fan Connector
CN4 337W Power Supply Connector (3.3V and 5V)
CN3 Mouse and Keyboard Ports
CN6 ATX Power Connector
CN7 Power Supply Connector
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 2 Wide Connector
CN30 Secondary IDE Connector
CN31 CD-in connector
CN32 SCSI Channel 1 Wide Connector

1-8User’s Guide
Connector Function
CN33 SCSI Channel 2 Narrow Connector
CN34 RDM LED Connector
CN35 External Speaker Connector
CN36/CN37 External LED Connector
CN38 Power Switch Connector
CN39/CN47 N.A
CN40 Wake-on-LAN (WOL) Connector
CN42 3-pin Standby Power Connector
CN43 Hard Disk LED Connector
CN44 Reset Button Connector
CN45 Feature Connector (Intel SMM Card)
CN46 Door Switch Connector
CNX19 Backplane board connector (3-pin)

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 the Pentium II and Pentium III
processors
The following section will briefly explain and illustrate how to install the
Pentium II and Pentium III processors.
You have to attached the fan sink before
installing the processor into the system
board.
1.6.1 Attaching the Processor Fan Sink
There are currently two kinds of fan sink. Both of them can be easily
attach to the processor module. The new fan sink includes a new
metal retention bracket to hold the processor module more securely.
The processor module comes with holes on one side to hold the clips
of the fan sink. The upper set of holes (near the latches) on the
processor are wider and should match the wider ends of the clips on
the fan sink. The lower set of holes are smaller and should match the
narrow ends of the fan sink clips.
Wide Holes
Narrow Holes
Wide Clip Ends Metal
Retention
bracket

System Board 1-11
Follow these steps when installing the fan sink and fan into the
processor module:
1. Remove the thermal tape protector at the back of the fan sink.
2. Insert the wide clip ends into the wide holes on the processor and
the narrow clip ends into the narrow holes.

1-12 User’s Guide
3a. Use a screwdriver to press and lock in the wide end of a clip first.
Then without lifting the screwdriver, point it downward to press
and lock the narrow end of the clip.
3b. Using your fingers, push down the metal bracket until it clicks into
the CPU cartridge and then push the metal bracket handle to
lock the metal bracket into place.

System Board 1-13
1.6.2 Installing a Pentium II or Pentium III
Processor
Follow these steps to install the processor to the socket on the CPU
board.
1a. Place the retention mechanism over the processor socket on the
CPU board. Secure it with the screws that came with the
package.
1b. Place the retention mechanism over the processor socket on the
CPU board. Secure it with the plastic pegs that came with the
package as shown below.

1-14 User’s Guide
2. With the processor module golden fingers pointing downward,
align the processor to the posts of the retention mechanism then
lower it down.
The golden fingers of the processor module
are slotted such that it only fits in one
direction. Make sure that the module groove
matches the one on the processor socket.
3. Press down the processor module until the golden fingers
completely fit into the socket.
4. Press the latches on the sides to lock the processor module into
place.

System Board 1-15
1.6.3 Removing a Pentium II or Pentium III
Processor
Follow these steps to remove the processor module from the CPU
slot.
1. Unlock the latches that secure the processor module.
2. Firmly hold the processor module and pull it out of the socket.

1-16 User’s Guide
1.7 Memory Upgrade
The four 168-pin sockets onboard support SDRAM-type DIMMs. You
may install 16-MB, 32-MB, 64-MB, 128-, 256-, or 512-MB (single and
double density) DIMMs for a maximum of 2048-MB system memory.
The SDRAM DIMMs should work under 3.3 volts only; 5 volt memory
devices are not supported. DX6G Plus supports both 100MHz
standard and registered SDRAM. However, please do not use them at
the same time.
Do not use both 66 MHz (unbuffered) and
100 MHz (registered) SDRAM together. This
might cause your system to malfunction.
Each of the sockets represents one independent bank. This allows
you to install DIMMs with different capacities to form a configuration.
1.7.1 Memory Configurations
The table below lists some system memory configurations. You may
combine DIMMs with various capacities to form other combinations.
DIMM1 DIMM2 DIMM3 DIMM4 Total Memory
32 MB 32 MB
32 MB 32 MB 64 MB
32 MB 32 MB 32 MB 96 MB
32 MB 32 MB 32 MB 32 MB 128 MB
64 MB 64 MB
64 MB 64 MB 128 MB
64 MB 64 MB 64 MB 192 MB
64 MB 64 MB 64 MB 64 MB 256 MB
128 MB 128 MB
128 MB 128 MB 256 MB

System Board 1-17
DIMM1 DIMM2 DIMM3 DIMM4 Total Memory
128 MB 128 MB 128 MB 384 MB
128 MB 128 MB 128 MB 128 MB 512 MB
256 MB 256 MB
256 MB 256 MB 512 MB
256 MB 256 MB 256 MB 768 MB
256 MB 256 MB 256 MB 256 MB 1024 MB
512 MB 512 MB
512 MB 512 MB 1024 MB
512 MB 512 MB 512 MB 1536 MB
512 MB 512 MB 512 MB 512 MB 2048 MB
1.7.2 Installing a DIMM
To install a DIMM, align it with the socket and press it down until the
holding clips secure the DIMM in place.
The DIMM socket is slotted to ensure proper
installation. If you slip in a DIMM but it does
not completely fit, you may have inserted it
the wrong way. Reverse the orientation of
the DIMM.

1-18 User’s Guide
1.7.3 Removing a DIMM
To remove a DIMM, press the holding clips on both sides of the
socket outward to release the DIMM.
Place your forefingers on the top of the
DIMM before you press the holding clips to
gently disengage the DIMM from the socket.
1.7.4 Reconfiguring the System
Reconfigure the system after installing or removing DIMMs.
Follow these steps to reconfigure the system:
1. Reboot the system. A memory error message appears,
indicating that the total memory does not match the value stored
in CMOS.
2. Press .
3. Press twice to exit Setup and reboot the system. The
system boots with the new memory configuration.

System Board 1-19
1.8 Installing Expansion Cards
1.8.1 Installing PCI Cards
To install PCI cards:
1. Locate the PCI slots on the system board.
2. Remove the bracket on the housing opposite an empty PCI slot.
3. Insert a PCI card into the slot. Make sure that the card is
properly seated.
4. Secure the card to the housing with a screw.
When you turn on the system, BIOS automatically detects and
assigns resources to the PCI devices.
1.8.2 Installing ISA Cards
Both PnP and non-PnP ISA cards require specific IRQs. When
installing ISA cards, make sure that the IRQs required by these cards
are not previously assigned to PCI devices to avoid resource conflicts.

1-20 User’s Guide
Follow these steps when installing ISA cards:
1. Remove all PnP cards installed in the system, if any.
2. Install non-PnP ISA cards.
3. Turn on the system.
4. Use the operating system or ICU to manually assign the
appropriate IRQs to the cards. This ensures that BIOS will not
use the resources assigned to the non-PnP ISA cards.
BIOS detects and configures only PnP cards.
5. Turn off the system.
6. Locate the expansion slots and install the PnP ISA and PCI
cards.
7. Turn on the system. This time PnP BIOS automatically
configures the PnP ISA and PCI cards with the available
resources.
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