VIA Mainboard 845G Series User manual
The 845G MAINBOARD Series Page 1
845GL
845GL845GL
845GL-
--
-MUT / 845G
MUT / 845GMUT / 845G
MUT / 845G-
--
-MWT
MWTMWT
MWT
Mainboard
MainboardMainboard
Mainboard
SOCKET 478 DDR Micro-ATX
Mainboard
Version 2.x
UM-845G/GL-MUWT-E1
Rev 2.0V
Creation Date: 04 July 2002
The 845G MAINBOARD Series
Page 2
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The 845G MAINBOARD Series Page 3
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Table Of Contents
The 845G MAINBOARD Series
Page 4
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Table Of Contents
The 845G MAINBOARD Series Page 5
Introduction
CPU Socket
DIMM Slots
PCI Slots AGP Slot
CN9: IDE1
CN10: IDE2
PC99 ATX Connector
CN15-A
CN15-D CN15-B
JP2
CN39
CN45
CN21
CN36
CN12 CN41
CN16
JP6
CN8
CN13
CN27 JP5
PWR-LED
SPK
PW S3L HL RS
CN32 CN38 JP3
CN17 JP4
JP1
CN30 CN31
The 845G MAINBOARD Series
Page 6
1.2.1. The 845G Mainboard Series
There are two models in this series: The 845G-MWT and the 845GL-MUT. The
845G mainboard is a Micro-ATX form factor with Pentium™4 DDR platform. It
supports a maximum memory of 2 GB and comes with six USB ports. Onboard
it has three PCI slots, one Onboard Audio (AC’97 2 channels). It also comes
with three fan connectors (for additional thermal protection) and three power
supply connectors. It also has a WOL (Wake-On-Lan) connector that enables it
to be “woken up” from a soft-off power state when it receives a signal from
the LAN.
The differences between the two models in this series are listed in the table
below.
Introduction
PC99 ATX Connectors (for 845G-MWT)
CN2: PS2 Mouse
CN1: PS2 Keyboard
CN35: LAN CN5: LPT CN18: Game/Midi
CN7: USB2
CN6: USB1 CN19: VGA
CN3: COM1 SPK OUT
LINE IN
MIC
PC99 ATX Connectors (for 845GL-MUT)
CN2: PS2 Mouse
CN1: PS2 Keyboard
CN5: LPT CN18: Game/Midi
CN7: USB2
CN6: USB1 CN19: VGA
CN3: COM1 SPK OUT
LINE IN
MIC
Model
Feature 845G-MWT 845GL-MUT
PSB 533 /400 MHz
(133/100 MHz QDR) 400 MHz
(100 MHz QDR)
AGP Slot Yes No
Onboard LAN Yes No
The 845G MAINBOARD Series Page 7
Introduction
Supports 64 Mb, 128 Mb, 256 Mb and 512 Mb technologies for x8 and x16 de-
vices. (Double-sided x16 devices are not supported)
Processor
The mainboard supports Socket 478 Intel®PentiumTM4 and CeleronTM CPUs.
Chipset
Northbridge Core Chipset: Intel® RG845G (GMCH) for 845G-MWT
Intel® RG845GL (GMCH) for 845GL-MUT
Southbridge Core Chipset: Intel®FW82801DB (ICH4)
I/O Chipset
iTE IT8712F
CPU Switching Voltage regulator
This mainboard is equipped with a switching voltage regulator that automati-
cally detects a DC power supply from +1.10V to +1.85V.
System Memory
The mainboard uses Double Data Rate Dual Inline Memory Modules (DDR
DIMM). It has two 184-pin DIMM sockets. These sockets support 2.5V (power
level) single-sided or double sided PC1600 (DDR200) or PC2100 (DDR266)
DDR DIMM modules. The maximum memory supported by the mainboard is 2
GB.
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Expansion Slots
The mainboard is equipped with three dedicated PCI slots and one 1x/2x/4x
AGP slot (This AGP slot only found on 845G-MWT, which only supports 1.5V
AGP cards).
AGP Slot Supports ADD Card (only for 845G-MWT)
The AGP Slot also supports the ADD (AGP Digital Display) card for output to a
TV or digital display.
Onboard Audio Features
Supports Microsoft DirectSound/DirectSound 3D and AC97 Full Duplex.
1.2.2. Mainboard Dimensions
Width 244 mm
Length 230 mm
1.2.3. Environmental Limitations
Operating Temperature: 10°C to 40°C (50°F to 104°F)
Required Airflow: 50 linear feet per minute across the CPU
Storage Temperature: -40°C to 70°C (-40°F to 158°F)
Humidity: 0 to 90% non-condensing
Altitude: 0 to 10 000 feet
The 845G MAINBOARD Series
Page 8
Introduction
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On-Chip VGA
The mainboard supports 2D/3D graphics card, maximum 3D resolution sup-
ported is up to 1600 x 1200 x 32@85 Hz.
Onboard LAN Features (only for 845G-MWT)
It comes with onboard LAN (VIA VT6105 LOM) which supports 10M/100M
based Ethernet.
Word Size
!Data Path: 8-bit, 16-bit, 32-bit, 64-bit
!Address Path: 32-bit
Front Side Bus Frequency (FSB)
For 845GL-MUT, P4 Socket 478 CPU at 400 MHz PSB (Processor System Bus)
(100 MHz QDR) is supported.
For 845G-MWT, P4 Socket 478 CPU at 533/400 MHz PSB (Processor System
Bus) (133/100 MHz QDR) is supported.
BIOS
!Award BIOS, Windows 95/98 Plug and Play (PnP) compatible.
!Supports SCSI sequential boot-up.
!Flash EPROM for easy BIOS upgrades.
!Supports DMI 2.0 function
Desktop Management Interface (DMI)
The mainboard comes with DMI 2.0 built into the BIOS. The DMI utility in the
BIOS will automatically record different information about your system
configuration and store this information in the DMI pool, which is a part of the
system board's Plug and Play BIOS. DMI, along with the appropriately
networked software, is designed for easy inventory, maintenance and the
simplified troubleshooting of computer systems.
WOL (Wake-On-LAN) Port
One WOL connector supports Wake-On-LAN functionality.
USB Ports
USB allows data exchange between your computer and a wide range of
simultaneously accessible external Plug and Play peripherals. The mainboard is
equipped with six USB 2.0 connectors. USB1 and USB2 are external connec-
tors. They can be found on the PC99 ATX connector. The other USB connectors
are internal connectors and can be used to connect other USB devices. (Cables
for the internal connectors are sold separately).
The 845G MAINBOARD Series Page 9
Introduction
Connectors
!Two IDE connectors
!One floppy drive interface supports up to two 2.88 MB floppy drives
!One 20-pin ATX power supply connector
!One 4-pin (2x2) 12V ATX power supply connector
!One 4-pin (1x4) ATX Auxiliary power supply connector
!CPU fan, power supply fan and chassis fan connectors
!One IR connector (optional)
!One S/PDIF connector (optional)
!One CD audio in connector
!One AUX-IN connector
!One front audio connector
!One SCR (Smart Card Reader) connector (optional)
!One WOL (Wake-On-LAN) connector
ATX Double Deck Ports (PC99 color-coded connectors)
!Two USB ports
!One RJ-45 LAN connector (only for 845G-MWT)
!One external DB-9 serial port connector: COM1 (UART)
!One VGA connector
!One SPP/ECP/EPP DB-25 parallel port
!One mini-DIN-6 PS/2 mouse port
!One mini-DIN-6 PS/2 keyboard port
!One GAME/MIDI port
!Three audio jacks: SPK-OUT, LINE-IN and MIC-IN
PCI Bus Master IDE Controller
!Two PCI IDE interfaces support up to four IDE devices.
!Supports ATA/33, ATA/66 and ATA/100 hard drives.
!PIO Mode 3 and Mode 4 Enhanced IDE (data transfer rate up to 16.6
MB/sec.).
!Bus mastering reduces CPU utilization during disk transfer.
!Supports ATAPI CD-ROM, LS-120 and ZIP.
Utility Panel: Front Audio
The Front Utility Panel is an interface that brings audio ports (MIC-IN, and
Hear Phone OUT) to the front of your system.
The 845G MAINBOARD Series
Page 10
Dual Function Power Button
Depending on the setting in the Soft-Off By Power-Button field of the Power
Management Setup, this switch allows the system to enter the Soft-Off or
Suspend mode.
RTC Timer to Power-on the System
The RTC installed on the system board allows your system to automatically
power-on at a set date and time.
Wake-On-LAN Ready
The Wake-On-LAN function allows the network to remotely wake up a Soft
Power Down (Soft-Off) PC. Your LAN card must support the remote wakeup
function. The 5V SB power source of your power supply must be at least
720mA.
USB Wake-up (optional)
The USB Wake-up function allows the USB keyboard to wake up a Suspend To
RAM (STR) PC.
ACPI Ready
The mainboard is designed to meet the ACPI (Advanced Configuration and
Power Interface) specification. ACPI has energy saving features that support
OS Direct Power Management (OSPM) for round the clock PC operation.
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Introduction
The mainboard is capable of monitoring the following health conditions of your
system:
1. Processor temperature. It has an overheat alarm.
2. VCORE/3.3V/5V/12V/-12V voltages and failure alarm.
3. Processor and chassis fan speeds. It has a failure alarm for these fans.
4. Read back capability that displays temperature, voltage and fan speed.
1.4.1. Hardware Monitoring System Utility
The mainboard comes with the Hardware Monitoring System utility contained
on the CD. It is capable of monitoring the systems hardware conditions such
as the temperature of the processor, voltage, and the speed of both the CPU
and chassis fans. You are allowed to manually set a range to the items being
monitored. We recommend that you use the Default Settings, which are the
ideal settings that will maintain the system in a good working condition.
1.4.2. Installation
To install this utility, please insert the CD into the CD-ROM drive. The auto run
screen (Driver Utility) will automatically appear. Click the Hardware Monitoring
button, choose the chipset, model number and the OS that is installed. Please
refer to the CD “Readme” file for further installation instructions.
Note: Only use this utility in Windows operating systems.
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The 845G MAINBOARD Series Page 11
The following is a checklist of all the expansion slots, jumpers and connectors
that should be configured on your mainboard before you can run your PC.
Hardware Installation
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Installation Checklist
Expansion Slots and Sockets
CPU Socket
DIMM Slots
PCI Slots
AGP Slot
Socket 478 Intel®Pentium™ 4 and Celeron™ CPUs.
Two 184-pin slots that supports up to 2 GB of DDR SDRAM .
Three 32-bit PCI slots.
One 1.5V Accelerated Graphics Port slot (It supports ADD card)
Internal Connectors
CN8
CN9
CN10
CN12
CN13
CN15-A
CN15-B
CN15-D
CN16
CN17
CN21
CN27
CN30/31
CN32/38
CN36
CN39
CN41
CN45
Floppy Disk Drive
Primary IDE
Secondary IDE
IR (optional)
CPU Fan
ATX Power Supply
ATX 12V Power Supply
Auxiliary ATX 12V Power Supply
Wake-On-LAN
Power Supply Fan
CD Audio In
Chassis Fan
Universal Serial Bus 3/4
Universal Serial Bus 5/6
S/PDIF Connector (optional)
Front Audio Connector
SCR Connector (optional)
Auxiliary In
FDC
IDE1
IDE2
IR
FAN1
ATX
ATX12V
AUX12V
WOL
FAN2
CD-IN
FAN3
USB3/4
USB5/6
S/PDIF
FRONT AUDIO
SCR
AUX-IN
External Connectors
CN1
CN2
CN3
CN5
CN6/7
CN18
CN19
CN35
PS/2 Keyboard Connector
PS/2 Mouse Connector
Serial Port 1
Parallel Port
Universal Serial Port 1/2
Game/MIDI Port
VGA Port
RJ-45 (LAN) Connector
KB
MS
COM1
LPT
USB1/2
GAME/MIDI
VGA
LAN
The 845G MAINBOARD Series
Page 12
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Hardware Installation
System Panel Buttons, Speaker and LED Connectors
PW
S3L
HL
RS
PWR-LED
SPK
Power On/Off and Suspend Switch Connector.
STR LED Connector (optional)
HDD LED Connector
Reset Button Connector
Power LED
Speaker Connector
Jumpers and Switches
JP1
JP2
JP3
JP4
JP5
JP6
KB/MS Power On
USB 1/2 Wake-Up
STR(S3) function (optional)
CPU FSB Clock Select
Clear CMOS
Clear Password
Before you start installing your mainboard we strongly recommend
that you use a grounded anti-static mat. We further recommend
that you attach an anti-static wristband, which is grounded at the
same location as the mat, to your wrist. Please refer the picture of
an anti-static mat and wristband below.
You need to complete the following installation steps before you use your PC.
!Check and set the mainboard settings.
!Install the Central Processing Unit (CPU).
!Install the memory modules.
!Install the expansion cards.
!Connect the ribbon cables, panel wires and power supply.
!Setup the system BIOS
The 845G MAINBOARD Series Page 13
2.3.2. Memory Modules
The mainboard has two 184-pin DDR DIMM slots and are able to support a
maximum memory of 2 GB. The DDR DIMM slots are located on the right hand
side of the board. To install the DIMMs into these slots, make sure the white
lever at each side of the slot has been pulled down to an angle of
approximately 45°. Make sure that the DIMM is in the correct orientation.
Place the DIMM on the slot and push down firmly.The white levers will come
back up and lock the module in place.
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2.3.1. Installation of the CPU
To install your processor, please complete the following set of instructions
1. Locate a small dot marked on the top of the CPU. This mark indicates
Pin 1 of the CPU.
2. Locate Pin 1 for the Socket on the mainboard.
3. There is a lever on the side of the socket. First push this lever side-
ways and then lift it to a 90-degree angle.
4. Insert the CPU into the Socket. Please make sure that Pin 1 for the
CPU is inserted into Pin 1 of the Socket.
5. When the CPU is installed correctly push the lever back into place.
6. Install a proper heat sink with cooling fan for proper heat dissi-
pation. Failing to install a heat sink with cooling fan may cause over-
heating which will burnout your CPU and damage your mainboard.
IMPORTANT: CPU COOLING FAN
Please ensure that you have an approved heat sink with cooling fan. Without a
proper heat sink with cooling fan you will damage both the mainboard and the
CPU.
Hardware Installation
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Top View of a 184-pin DIMM Slot
Supports 64 Mb, 128 Mb, 256 Mb and 512 Mb technologies for x8 and x16 de-
vices. (Double-sided x16 devices are not supported)
The 845G MAINBOARD Series
Page 14
2.3.3. PCI Slots
The mainboard comes with three PCI slots. They are located on the left hand
side of the board. Both PCI and PCI expansion cards may require IRQ’s. This
mainboard complies with Plug and Play (PnP) specifications. Whenever a PnP
compliant card is added the system will automatically be configured and the
IRQ’s will be assigned automatically.
When you are inserting your PCI card make sure that the pins are correctly
aligned. When the pins are properly aligned with the hole’s in the slot, push
down gently.
Hardware Installation
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Top View of a 32-bit PCI Slot
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2.3.4. AGP Slot (only for 845G-MWT)
AGP (Accelerated Graphics Port) is a dedicated bus slot. It operates at 66 MHz
and transfers data at a rate up to 1066 MB/s. This allows 3D applications to
run more smoothly. The mainboard comes with a 1.5V AGP slot. This slot is
able to support 1x/2x and 4x (1X is 266 MB/s, 2X is 533 MB/s; and 4X pro-
vides 1066 MB/s) AGP cards.
Only 1.5 volt AGP graphics cards are supported by the Intel®845G
chipset motherboards. If a 3.3 volt AGP card is used in an Intel®845G
chipset based motherboard there is a high probability of damaging the
chipset, the mainboard and the CPU.
The 845G MAINBOARD Series Page 15
2.4.1. Floppy Disk Connector
Connector: CN8 (FDC)
Type: 34 pin block
The FDC connector can support two floppy drives. It is located at the front of
the mainboard. To connect, use the ribbon-cable that has been provided.
Make sure that the red strip is connected to PIN 1 of the connector.
2.4.2. Primary and Secondary IDE connectors
Connector: CN9 (IDE1)/CN10 (IDE2)
Type: 40 pin block
The mainboard has two IDE connectors: a primary and secondary. Each IDE
connector can support two IDE drives. These mainboards can therefore sup-
port up to four IDE devices each. If you install two hard drives, you need to
configure the second drive to slave mode in the BIOS setup. Please refer to
your hard drive manual for the appropriate jumper settings.
Hardware Installation
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Top View of a Floppy
Disk Drive Connector
Top View of an
IDE Connector
20 PINS
PIN 1
Top View of an AGP Slot
21 pins 41 pins
2.4.3. Infrared Connector (optional)
Connector: CN12 (IR)
Type: 5 pin
The IR connector supports an optional wireless transmitting and receiving
module. Please make sure the Pin 1 location.
The 845G MAINBOARD Series
Page 16
2.4.5. ATX Power Supply Connectors
Connector: CN15-A/CN15-B/CN15-D
Type: 2x10/2x2/1x4
The mainboard comes with three onboard
power supply connectors labeled CN15-A,
CN15-B and CN15-D. CN15-A and CN15-B
are regular ATX power supply connectors.
The auxiliary power supply connector
(CN15-D) is for a +12V and +5V power
supply. These increased power supplies
are necessary to provide extra power for
the slot. The ATX 12V power supplies are
all downward compatible with standard
ATX power supplies. Plug in CN15-D as
long as you find out your power supply
without ATX12 (CN15-B) connection.
Otherwise it is no necessary to use
CN15-D (AUX12V).
2.4.4. CPU Fan, Power Supply Fan and Chassis Fan Connectors
Connector: CN13 (FAN1)/CN17 (FAN2)/CN27 (FAN3)
Type: 3 pin
The cooling fans must be connected to their respective power connectors. If
you have installed the hardware-monitoring feature you will be able to monitor
the rotating speed of the CPU cooling fan in your Windows operating system.
Hardware Installation
Fan Signal +12V DC
Ground
1 Ground
2 +12V DC
3 Fan Signal
Top View of a Fan Connector Front View of a Fan Connector
Pin 1 Pin 11
+3.3VDC
+3.3VDC
COM
+5VDC
COM
+5VDC
COM
PWR_OK
+5VSB
+12VDC
+3.3VDC
-12VDC
COM
PS_ON#
COM
COM
COM
-5VDC
+5VDC
+5VDC
ATX Power Supply Connector
Pin 1 Pin 3
COM
COM
+12VDC
+12VDC
ATX12V Power Supply Connector Auxiliary Power Supply Connector
Pin 4
Pin 3
Pin 2
Pin 1
+5VDC
COM
COM
+12VDC
The 845G MAINBOARD Series Page 17
2.4.6. WOL (Wake-On-LAN) Connector
Connector: CN16
Type: 3 pin
The mainboard has a WOL (Wake-On-LAN) connector. This connector must be
connected to a LAN card that has Wake-On-LAN (WOL) output. It powers up
the system when a wakeup packet or signal is received through the LAN card.
In order to use the WOL LAN card to trigger the power on the PC system, the
switching power supply must have the ability to provide a driving current of at
least 720 mA and be connected to a “5V standby” voltage.
Hardware Installation
2.4.7. CD-IN/AUX-IN Connector
Connector: CN21 (CD-IN)/CN45 (AUX-IN)
Type: 4 pin un-housed
This mainboard has one CD-IN connector, AUX-IN connector. The CD-IN con-
nector is used to connect the CD ROM audio out and allows the system to re-
ceive audio input from the CD ROM. The AUX-IN connector allows the system
to receive signals from other audio devices like a radio or tape.
Right Channel
CD-IN/
AUX-IN
Left Channel
CD-IN/
AUX-IN
Ground
1 Left Channel CD/AUX-IN
2 Ground
3 Ground
4 Right Channel CD/AUX-IN
Top View of a CD/AUX-IN
Connector Front View of a CD/AUX-IN
Connector
Ground
WOL
5V_SB
Ground
1 5V_SB
2 Ground
3 WOL
Top View of a WOL Connector Front View of a WOL Connector
2.4.8. SCR Connector iTE type (optional)
Connector: CN41
Type: 14 pin
The smart card PCB is connected to the motherboard with a 14-pin ribbon ca-
ble. Please make sure the Pin 1 location.
The 845G MAINBOARD Series
Page 18
Hardware Installation
Top View of USB Ports Front View of USB Ports
2.4.9. S/PDIF Connector (optional)
Connector: CN36
Type: 4 pin un-housed
The motherboard comes with one internal S/PDIF connector which is a digital
interface that can be used to improve the quality of the output from your
system. Please make sure the Pin 1 location.
2.4.10. Front Audio Connector
Connector: CN39
Type: 10 pin
This connector should be used with the front utility panel. The utility panel
was developed so that the user is able to bring the Hear Phone OUT and
MIC-IN connectors to the front of their PC. This makes things like plugging in
speakers and earphones much less troublesome. Please make sure the Pin 1
location.
2.4.11. USB3/4 and USB5/6
Connector: CN30 (USB 3)/CN31 (USB 4)/CN32 (USB5)/CN38 (USB6)
Type: 5 pin
You already have two USB2.0 ports available, USB1 and 2 (see external con-
nectors). The internal USB connectors allow you to add on an optional kit to
expand the total number of USB ports available. The mainboard has four in-
ternal USB2.0 connectors (CN30/CN31/CN32/CN38). This enables you to use
an extra four USB devices. Cable for these additional connectors needs to be
purchased separately.
Note: The PIN assignment of the internal USB 2.0 connectors (CN30, CN31,
CN32 and CN38) are follow the specifications of Intel standard.
9 Key
7 Ground
5 Data+
3 Data-
1 VCC 2 VCC
4 Data-
6 Data+
8 Ground
10NC
USB3/5 USB4/6
1 VCC
3 Data -
5 Data +
9 Key
7 Ground
2 VCC
4 Data -
6 Data +
8 Ground
10 NIC
USB3/5 USB4/6
The 845G MAINBOARD Series Page 19
Hardware Installation
2.5.1. PW: Power On / Off and External Suspend Switch Connector
The Power On/Off connector has two functions. It can be the Power Switch or
Suspend Switch of your PC system. You can either choose “Delay 4 Sec” or
“Instant OFF” (Please refer to the Award BIOS setup instructions in Chapter
3).
Option 1: If you choose “Delay 4 Sec.” In the BIOS CMOS Setup, the func-
tion of “PW” will be:
A. When the system power is "OFF", press this switch, the system will
power on.
B. When system power is "ON”, you can select two different modes: -
Mode 1: Press and hold the Power ON button for less than 4 seconds and then
release it. The system will be turned into Suspend mode (turned into the
GREEN mode) When the system is in the Suspend mode:-
!Press the Power on button (less than 4 seconds), the system will return
to Full-ON mode.
!Press and hold the Power On Button for more than 4 seconds, the
system will be powered off.
Mode 2: Press and hold the Power ON button for more than 4 seconds, the
system will be completely powered off.
Option 2: If you choose “Instant OFF.” In the BIOS CMOS Setup, the power
switch will operate like a normal ON / OFF Power button.
The following System Panel Buttons and
LED Connectors can be found at the
front of the mainboard on the left hand
side.
PW= Power On/Off and Suspend Switch
Connector
S3L= STR LED Connector (optional)
HL= HDD LED Connector
RS= Reset Button Connector
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Top View of the System Panel
and LED Connectors
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The 845G MAINBOARD Series
Page 20
2.5.2. S3L: STR LED Connector (optional)
This LED indicates the status of Suspend to RAM (S3) state.
2.5.3. HL: HDD LED Connector
Any read and write activity by the HDD will turn this LED on.
2.5.4. RS: Reset Button Connector
If you connect this connector, you will be able to reset you computer by press-
ing the reset button at the front of the chassis.
Hardware Installation
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+5V DC
+5V DC
Speaker
Signal
Ground
Speaker
Signal
Ground
Speaker
Signal
No Con-
nector
POWER LED
PIN 1
PIN 1
Top View of the Speaker
and Power LED Connector
CN2: PS2 Mouse
CN1: PS2 Keyboard
CN35: LAN CN5: LPT CN18: Game/Midi
CN7: USB2
CN6: USB1 CN19: VGA
CN3: COM1 SPK OUT
LINE IN
MIC
The PC99 ATX connectors picture for 845G-MWT
This manual suits for next models
2
Table of contents
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