VIA Technologies KM400 Instruction manual

TRADEMARK
All products and company names are trademarks or registered
trademarks of their respective holders.
These specifications are subject to change without notice.
Manual Revision 1.1
March 25, 2005
60000018KMX11
VIAVIA
VIAVIA
VIA KM400KM400
KM400KM400
KM400 mainboardmainboard
mainboardmainboard
mainboard
for AMD Socket A processorfor AMD Socket A processor
for AMD Socket A processorfor AMD Socket A processor
for AMD Socket A processor
Quick UserQuick User
Quick UserQuick User
Quick User’s’s
’s’s
’s
GuideGuide
GuideGuide
Guide
Quick UserQuick User
Quick UserQuick User
Quick User’s’s
’s’s
’s
GuideGuide
GuideGuide
Guide

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DISCLAIMER OF WARRANTIES:
THEREARENOWARRANTIESWHICHEXTENDBEYONDTHE
DESCRIPTION ON THE FACE OF THE MANUFACTURER LIMITED
WARRANTY.THEMANUFACTUREREXPRESSLYEXCLUDES ALL
OTHERWARRANTIES,EXPRESS OR IMPLIED,REGARDING ITS
PRODUCTS;INCLUDING ANY IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
NONINFRINGEMENT.THIS DISCLAIMER OFWARRANTIES SHALL
APPLY TO THE EXTENT ALLOWED UNDER LOCAL LAWS IN THE
COUNTRY PURCHASED IN WHICH LOCAL LAWS DO NOT ALLOW
OR LIMIT THE EXCLUSION OF THE IMPLIED WARRANTIES.

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Processor Support
Supports 462-pin Socket A for AMD Athlon XP processors with 266/333MHz
Front Side Bus
Chipset
VIA KM400 + VT8237 Chipset
- with VIA Unichrome Graphics core
Main Memory
Two 184-pin DDR DIMM sockets for PC2100/PC2700 (DDR266/333) DIMMs
Supports up to 2GB memory size
BIOS
Flash EEPROM with Award BIOS
- ACPI v2.0 compliant
- SMBIOS (System Management BIOS) v2.2 compliant
LAN
Integrates 10/100Mps Fast Ethernet controller with onboard VIA 6103 PHY LAN
Legacy IO Support
Winbond W83697HF LPC IO controller with floppy, printer, serial and CIR/SIR
interface
Audio
Six channel audio with analog and digital output using Realtek ALC655 AC’97 CODEC
- AC’97 v2.3 compliant
- Supports CD-In, Aux-In
- Supports Line-out and Mic-In for front panel
- Supports automatic “jack-sensing”
- Rear panel audio jacks configuration:
Expansion Slots
One AGP v3.0 compliant slot supporting 1.5v 8X AGP card
Three PCI v2.2 compliant slots with Bus Master support
One CNR slot
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1. Specification

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Other Features
Magic Health – a BIOS H/W monitoring utility for voltage, temperature and fan-
speed sensing displayed during POST
EZ Boot – A simple shortcut to select the boot device, e.g. hard drive, CD-ROM
or floppy without entering CMOS setup
Supports exclusive KBPO (Keyboard Power On) function
Form Factor
244mm x 220 mm Micro-ATX size
1.2 Block Diagram

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2. Setting up the mainbaord
Before assembling the mainboard into the PC case we recommend you to perform.
1. CPU Installation
2. DDR Memory Insertion
After the mainboard is fitted into the case, you may
3. Install Add-on VGA Or PCI cards
4. Connect the internal cables and wires
5. Connect your external peripherals to the rear I/O port
Step 1
Open the socket by raising the actuation
lever.
Step 2
Align pin 1 on the CPU with pin 1 on the
CPU socket as shown above. Insert the
CPU and make sure it is fully inserted into
the socket.
3.1 CPU Installation
3. Installation
The CPU is keyed to prevent incorrect insertion, do not
force the CPU into the socket. If it does not go in easily,
check for mis-orientation.

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3.2 DDR Memory Insertion
The mainboard accommodates two PC2100/PC2700 184-pin DIMMs (Dual In-line
Memory Modules):
• Supports up to 2.0GB of 266/333MHz DDR SDRAM.
• Supports unbuffered non-ECC DIMMs.
•DDR SDRAM supports 64, 128, 256, 512MB and 1GB DIMM modules.
• Supports DRAM configurations defined in the JEDEC DDR DIMM specification.
Step 3
Close the socket by lowering and locking the
actuation lever.
Step 4
Install the cooling fan assembly.
• Installing without a cooling fan will cause CPU overheat and damage the CPU.
• Apply heatsink thermal compound/paste to the CPU.
To install, align the notch on the
DIMM module with the connector.
Press straight down as shown in the
figure until the white clips close and
the module fits tightly into the
DIMM socket.
Notch

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3.3 VGA and PCI card installation
To install a VGA card into the AGP slot or a PCI expansion card:
1. Remove the bracket (on the PC case) for the slot you intend to use.
2. Firmly press down the card into the slot until it is completely seated. For an AGP
card ensure the AGP slot clicker is locked as shown in the picture below.
3. Secure the card's bracket to the PC case with a screw.
The AGP slot supports only newer VGA cards with 1.5V specifications.

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3.5 Internal Connectors
3.4 Rear IO Port
5
4
6
87
2
1
1
9
3
10
11
COM1
Parallel Port RJ-45
LAN
USB2.0 ports
PS/2
Mouse
PS/2
Keyboard Mic-in/Center&Subwoofer (Pink)
Line-out/Front out (Lime)
Line-in/Rear out (Light blue)
VGA1

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Connectors Figure Discriptions
1
Ground
+12V
Sense
JCPU_FAN
JSYS_FAN
CPU / System Fan Power Connectors
JCPU_FAN: The CPU must be kept cool by
using a heatsink with fan assembly.
JSYS_FAN: Use this connector if you are
installing an additional fan in the unit.
2FDD Floppy Drive Connector
3IDE1
Primary IDE
IDE2
Secondary IDE
1
1
Primary/Secondary IDE Connector
Connects to the IDE device, i.e. HDD and CD-
ROM device.
4PW1
1
-12V3.3V
Ground+5V
PS-ON+5V
-5VPW-OK
+5V5VSB
+5V+12V
10
11
3.3V3.3V
GroundGround
GroundGround
GroundGround
20
PW1: 20-pin ATX Power Connector
The plugs of the power cables are designed to fit
in only one orientation.
5CFPA
1
Rear Line-out-FR
Front Line-out-R
Rear Line-out-FL
Front Line-out-L
MIC_In
NC +5V
Key
9
2
10
GND
CFPA: Front Panel Audio Connector
This connector is used only if the speaker and
microphone needs to be plugged at the front of
the PC case. Otherwise, leave the jumpers at the
default position.
1When using two IDE drives on the same
connector, one must be set to Master
mode and the other to Slave mode.
Refer to your disk drive user’s manual
for details.
6
CD-IN/AUX-IN: CD Audio-in connectors
These connectors are used to receive audio form a
CD-ROM drive, TV tuner or MPEG card.
CD_IN_Left
1
CD_IN_Right
CD_Reference
AUX_IN_Left
1
AUX_IN_Right
GND
CD-IN
AUX-IN

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Connectors Figure Discriptions
8CFP
CFP: Case Front Panel Connector
HD_LED
This LED indicates hard drive activity.
PWR_LED
Connects to the power indicator on the PC case.
RST
Connects to the RESET switch on the PC case.
PW_ON
Connects to the Power button on the PC case, to
turn on the system. To turn off the system,
press the power button for 4 seconds.
CIR
CSPK
CIR: IR connector
For connection to an IrDA receiver unit.
CSPK: Speaker
Connects to the case’s speaker for PC beeps.
Settings:
1-2: Normal (Default)
2-3: Clear CMOS
JCMOS: Clear CMOS data Jumper
This resets the BIOS CMOS data back to the
factory default values. Recommend to leave at
Normal (default) postion.
JCMOS
10
7CUSB3
CUSB4
CUSB3/CUSB4: Four USB2.0 header
This mainboard includes 4 additional onboard
USB ports.
To use these additional USB ports, a USB bracket
is required. Please contact your retailer for details.
1
1
1
GND
A-B-
B+
GND
A+
GND
9SATA1
SATA2
SATA1 / SATA2: Two Serial ATA Connectors
These connectors enable you to connect Serial
ATA devices that conform to the Serial ATA
specification.
JCK1 JCK2 Settings:
1-2 1-2 100MHz (Default)
2-3 1-2 133MHz
2-3 2-3 166MHz
JCK1/JCK2: CPU FSB Select Jumper
This jumper is used to select the front side
bus of the CPU installed on the mainboard.
JCK1
JCK2
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