TRIGEM NARA-M Micro-ATX Technical manual

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TriGem Micro-ATX Motherboard (NARA-M)
Hardware Document
November 18, 2000
Revision 1.1

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Document Revision History
Released date Revision Description
May 16, 2000 Rev. 0.9 First prepared for this document.
This document describes the major specification of the NARA-M
motherboard and the functional feature to be extended by the customer.
The motherboard revision number is EVT1
July 18,2000 Rev. 1.0 Mass Product
Nov 18,2000 Rev. 1.1 - Updated CPU Specification
- Change the Chipset Mark for Vt82C694X(z)
- Changed the Clock gen. FromICworks W144H to ICS9248CF-98
Marketing Information
Address 1055 Shingil-Dong, Ansan, Kyunggi-Do, Korea
Telephone [phone](International Business Team)
Fax [phone]
Email [e-mail] (Dong Chun Chang)
Technical Support
Address 1055 Shingil-Dong, Ansan, Kyunggi-Do, Korea
Telephone [phone]
Fax [phone]
Email [e-mail](YoungChel Park)
[e-mail](Hyenki Baek)
[email protected] (Chang Yu)
User’s Notice
No part of this product, including the schematics and BIOS may be reproduced, transmitted, transcribed,
stored in a retrieval system, or translated into any language in any form by any means without the
express written permission of TriGem Computer Inc. except the document kept by the purchaser for
backup purposes.
© Copyright 2000 TriGem Computer Inc. All rights reserved

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Contents of Table
I. Introduction
1. Generation Description ------------------------------------------------------------ 4
2. Function Block Diagram ------------------------------------------------------------ 6
II. System Overview
1. Major Units ----------------------------------------------------------------------------- 7
2. Upgradeability ------------------------------------------------------------------------- 8
2-1. Processor -------------------------------------------------------------------------- 8
2-2. Memory ----------------------------------------------------------------------------- 8
2-3. BIOS --------------------------------------------------------------------------------- 9
2-4. Expansion Slot -------------------------------------------------------------------- 9
2-5. Advanced Configuration and Power Interface (ACPI) ------------------- 10
2-6. Manufacturing Options---------------------------------------------------------- 10
III. Jumper & Connector Description
1. Motherboard Jumper Setting ------------------------------------------------------ 11
1-1. Selection for Processor CPU Clock ------------------------------------------ 11
1-2. Other functionality --------------------------------------------------------------- 11
1-3. On Board Audio device function ------------------------------------------------- 12
1-4. OEM/ODM selector -------------------------------------------------------------- 12
2.I/O Header Connector Description --------------------------------------------- 13
2-1.Motherboard Internal Connector --------------------------------------------- 13
2-2.Motherboard External I/O Port ------------------------------------------------ 16

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I. Introduction
The NARA-M Micro-ATXmotherboard offers a time to market consumer and corporate desktop solution
featuring the Intel Pentium-III FC-PGA processor with 66/100/133MHz front side bus and the VIA VT82C694Z sets in
an Micro-ATX low profile motherboards.
The NARA-Mmotherboard was designed to be highly minimized system cost. In this effort, ATX gives the
greater space economy and more affordable systems. Integrating 4X AGP slot, as well as PCI audio solution with
AC97 Codec onto the motherboard eliminates the need for more expensive graphic and audio add-in cards. The end
result is a system platform with a primary component level of integration with translates into affordable solution for
entry level users.
1. General description
qMotherboard
•Small PCB size in the Micro ATX form factor (ATX V1.2 form factor)
•228mm * 238mm * 1.6t (4 Layers)
qProcessor
•Intel Pentium-III FC-PGA 500E up to 1GEB MHz processor support
qMain Chipset
•System Core (North bridge)
- VIA VT82C694Z
•PCI Super I/O Integrated Peripheral Controller (South Bridge)
- VIA VT82C686A
•Audio : SoundBlaster Pro Hardware and Direct Sound AC97 Audio at VT82C686A and
CS4297A Codec or CS4281 PCI Audio Controller and CS4297A Codec
•Super I/O : Integrated Super I/O Controller in VT82C686A
•DC-DC Converter: Semtech SC1164
•Clock : ICS 9248-98 (66MHz/100MHz/133MHz host clock support)
qMemory Configuration
•System Memory
- Four banks (2 DIMM) of 64-Bits Advanced Memory controller supporting PC100/PC133SDRAM,
VCM SDRAM, and ESDRAM with max 2GB(512Mb DRAM technology)
- DRAM interface runs synchronous (66/66, 100/100, 133/133) mode and pseudo-synchronous
(66/100, 100/66, 100/133, 133/100) mode with FSB
•Flash Memory :Programmable 2MB Flash memory
qI/O Feature
•Integrated standard I/O functions in the rear side
- One multi-mode parallel port
- Two FIFO serial ports
- PS/2 styles keyboard and mouse port
- Tow USB ports
- Three audio jack for Line input, Speaker output and MIC input
•Integrated extended I/O functions
- Two USB port (Header Connector type)
qUltraDMA-33 / 66 Master Mode PCIEIDE Controller
- Transfer rate up to 33MB/sec to cover PIO mode 4, multi-word DMA mode 2 drives, and Ultra DMA-
33 interface
- Increased reliability using UltraDMA-66 transfer protocols
- Support ATAPI compliant devices including DVD devices
- Dual channel master mode PCI supporting four Enhanced IDE devices
qAudio Subsystem (ManufactoryOption parts)
•Built in PCI Audio Controller in VIA VT82C686A and CS4297A Codec
- SoundBlaster Pro Hardware and Direct Sound Ready AC97 Digital Audio Controller
- Dual full-duplex Direct Sound channels between system memory and AC97 link
- PCI master interface with scatter / gather and bursting capability

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- 32 byte FIFO of each direct sound channel
- Standard v1.0 or v2.0 AC97Codec interface for single or cascaded AC97Codec
•Crystal CS4281 PCI audio controller and CS4297A Codec(Default)
- PCI version 2.1 bus master
- MPU-401 interface, FM synthesizer, and game port
- Full duplex operation
- PC 97 and PC 98 Compliance (and compliance with preliminary PC 99)
- Digital Docking Solution with AC97 2.0 Codec
?Refer toPCI interrupt & master number routing map part at pages 10
qGraphic Subsystem
•Full Featured Accelerated Graphics Port (AGP) Controller
- Supports full AGP v2.0 capability for maximum bus utilization including 2x and 4x mode transfers
- Supports SideBand Addressing (SBA) mode (non-multiplexed address / data)
- Supports 266 MHz 4x mode for AD and SBA signaling
- Pipelined split-transaction long-burst transfers up to 1GB/sec

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II. System Overview
Rear Port
Intel Pentium-III
Cu-256K FC-PGA
VIA
VT82C686A
Host Interface
PCI Interface
DIMM Modules
3 PCI Slots
CS4281
Speaker MICLine In
1 AGP (2X or 4X) Slot
PrimaryIDE
Secondary IDE
FDD
Super I/O Function
Rear Port
MOUSE
K/B
Parallel Port 2 Serial Ports
4 USB Ports
(2 ports are Option)
Joystick and
MIDI
VIA
VT82C694X(Z)
CS4297A
Codec

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1.Major Units
1. Audio Power AMP : TPA1517
2. AC97 Codec : CS4297A
3. North bridge : VT82C694X(z)
4. PCI Sound : CS4281
5. South bridge : VT82C686A
6. Flash ROM : W29C020P-12
7. FDD Connector : FDD (34 Pins)
8. IDE Connector2 : Secondary IDE (40 Pins)
9. IDE Connector1 : PrimaryIDE (40 Pins)
10. Battery : CR2032
11. Clock generator : ICS9248-98
12. DC-DC Converter : SC1164
13. CPU Socket : Intel FC-PGA Pentium III processor
2
4
5
6
3
11
13
1
10
12
9
8
7

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2. Upgradeability
2-1. Processor
NARA-M motherboard provides the 370pin PGA370 socket that is not backward compatible with ZIF socket-7
processors The Processor’s VID pin automatically program the voltage regulator on the motherboard to the
required processor voltage. The motherboard supports processors that run internally at Variable speed clock.
qSupported Intel Pentium-III Processors (PGA-370 Socket Type)
•Intel : Cu-256K 500E MHz up to1GEB MHz (FC-PGA Type)
?E: Processor with Advanced transfer code
B: 133 MHz system bus frequency
2-2. Memory
The motherboard has two, dual inline memory module (DIMM), minimum 16MB to maximum 512MB memory
size. The BIOS can automatically detect the memory type, size, and speed through SMBUS interface between
the core chipset and DIMM module.
The motherboard supports the following memory features
•3.3V and unbuffered 168-pin DIMM
Voltage detection
3.3V Version 5V Version
Unbuffered detection Unbuffered Buffered
•DRAM interface synchronous with host CPU (66/100/133 MHz) or AGP (66MHz) for most flexible
configuration.
•Supports FP, EDO, SDRAM, ESDRAM, and VCM SDRAM memory types
•Different DRAM types may be used in mixed combinations
•Different DRAM timing for each bank
•4banks up to2GB DRAMs at 100 / 133 MHz

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2-3 BIOS
The motherboard uses a TriGem-AMI BIOS, which is stored in flash memory and can be upgraded using a disk-
based program. A new version of the BIOS can be upgraded from a diskette using the Flash Memory Update
utility.
qFlash memory organization
Address (Hex) Size Functional description
FFFFC000 - FFFFFFFF 16KB Boot block
FFFF8000 - FFFBFFFF 16KB NVRAM block
FFFC0000 - FFF7FFFF 224KB Main BIOS block
qOn-board device management
The BIOS can manage the devices on the motherboard over the CMOS setup menu. However, the
corresponding jumper as described Jumper setting section later can disable the built-inAudio controller.
Device Description CMOS setup menu Default value
Internal Cache Processor Enable / Disable Enabled
PS/2 Mouse VIA VT82C686A Enable / Disable Enabled
USB Function VIA VT82C686A Enable / Disable Enabled
On board FDC VIA VT82C686A Auto / Enable / Disable Auto
Onboardserial VIA VT82C686A Auto / 3F8 / 2F8 / 3E8 / 2E8 Auto
On board parallel VIA VT82C686A Auto / Disable / 378 / 278 / 3BC Auto
On board IDE VIA VT82C686A Disable / Primary / Secondary / Both Both
2-4. Expansion Slot
The motherboard support PCI and AGP function. PCI functions are extended to the additional slot with three PCI,
and AGP function is designed in the motherboard with AGP graphics controller.
qPCI configuration space map
Bus number Device number Function number Device
00 00 00 Host/PCI Bridge(VIA VT82C694Z)
00 01 00 AGP Controller
00 07 00 PCI/ISA bridge (VT82C686A)
00 07 01 IDE bus master (VT82C686A)
00 07 02 USB Controller 1(VT82C686A)
00 07 03 USB Controller 2(VT82C686A)
00 07 04 Powermanagement(VT82C686A)
00 0D 00 PCI Audio(CS4281)
01 00 00 AGP Slot
00 13 00 PCI slot1
00 12 00 PCI slot2
00 11 00 PCI slot3

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qPCI interrupt & master number routing map
VIA VT82C686A PCI/ISA bridge has five programmable interrupt request input signals. Any PCI interrupt source
connects to one of these interrupts signals and assigned to the free proper interrupt number by PnP BIOS.
SB INT
signals First PCI slot Second PCI slot Third PCI slot On Board PCI Audio VT82C686A
PIRQA INTA INTB INTC
PIRQB INTB INTC INTD
PIRQC INTC INTD INTA
PIRQD INTD INTA INTB INTA
Master REQ0 REQ1 REQ2 REQ4
IDSEL AD30 AD29 AD27 AD24 AD18
2-5. Advanced Configuration and Power Interface (ACPI)
The motherboard and system BIOS support the ACPI that requires an ACPI-aware operating system such as
Window-NT 5.0 or Windows 98. ACPI feature include
•Plug and play and APM functionality normally contained in the BIOS
•Power management control of individual devices: add-in cards, hard disk drives, USB devices, and
Video
•A soft-off feature that enables operating system to power off the computer
•Support for multiple wakeup events
•Indication LED for normal mode (Green), standby mode (Blinking Green), and suspend mode (Blinking
Green) but this function is dependent on the LED logic.
qWakeup devices and events
Wakeup device Wakeup events and functionality
Powerswitch Wakeup from Power-off status and power-off function
LAN Wakeup from power-off status
Modem Wakeup from power-off status
Sleep button Wakeup from power-off status and go to suspend mode (option)
2-6. Manufacturing Options
The motherboard hasseveral manufacturing options according to OEM/ODM requirement. Make sure that these
options can be applied in the assembly stage, and it’s impossible to upgrade or change in the customer field.
Option items Selectable functionality Feature changes
Joystick port Front side
USB port Front side
Sound function PCI Audio & AC97 /
On chip Sound & AC97
InstallCS4281 PCI Audio & CS4297A
or Install CS4297A

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III. Jumper & Connector Description
1.Motherboard Jumper Setting
1-1. Selection for Processor CPU Clock
&Intel Coppermine FC-PGA Processor is auto set the core to bus frequency ratio.
&Not used CN77, This is debugging option.
1-2. Other functionality
Jumper Pin Function 1-2 2-3
J6 CMOS RAM function Enable write/save Clear CMOS RAM
J7 Password function Enable password Clear password
J8 CMOS setup function Enable to edit CMOS
contents Disable to edit CMOS contents
J9 FDD write protect Enable to write data
to Floppy disk Disable to write data to Floppy disk
J3 J4 J5
J1
CN77
J6
J7
J8
J9

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1-3. On Board Audio device function
J1 On Board PCI audio device functionality
1-2(default) Enable PCI audio controller built in the motherboard
2-3 Disable PCI audio controller built in the motherboard
1-4. OEM/ODM selector
The jumpers (J3, J4 & J5) will be optional parts for the OEM/ODM logo message selector.

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2. I/O Header Connector Description
2-1. Motherboard Internal Connector
q1 : CPU FAN connector (CN54)
Pin number Signal description
1GND
2FAN power
3Tachometer (speed)
q2: System Chassis FAN connector (CN53)
Pin number Signal description
1GND
2FAN control
3Tachometer (Speed)
1 2 3
CN54
1 2 3
CN53
1
4
5
10
8
3
7
6
2
11
13
9
12
15
14

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q3: Joystick & USB connector (CN71) ; (Do not used in ATX form Factor)
Pin Signal description Pin Signal description
1VCC 9VCC
2GD(4) 10 GD(6)
3GD(0) 11 GD(2)
4GND 12 MIDI OUT
5GND 13 GD(3)
6GD(1) 14 GD(7)
7GD(5) 15 MIDI IN
8VCC 16 Key
1GND 3Positive DATA
2Negative DATA 4VCC
q4: Modem Sound (CN70) Pin Signal description Pin Signal description
1MONO IN 3GND
2GND 4MIC
q5: CD Sound (CN44)
Pin Signal description Pin Signal description
1GND 3GND
2Left Sound 4Right Sound
q6: LAN Wakeup (CN50) Pin Signal description Pin Signal description
1+5VSB 3LANWK
2GND
q7: Modem Wakeup (CN51) Pin Signal description Pin Signal description
1Modem Ring 3+5VSB
2GND
q8: Indicator Header (CN48)
Pin Signal description Pin Signal description
1VCC 12 GND (Option)
2PM indicator signal 13 IRTX (Option)
3GND 14 VCC (Option)
4Key 15 IRSEL (Option)
5VCC 16 N.C
6HDDaccesssignal 17 GND (Option)
7Key 18 Key (Option)
8Power-ONswitchsignal 19 VCC (Option)
9GND 20 GND (Option)
10 Key 21 N.C
11 IRRX (Option) 22 Speaker signal(Option)
1 2 3 4
CN70
1 2 3 4
Mitsumi CD (CN44)
1 2 3 4
1 2 3 4
3 1 8 7 6 5 4 3 2 1
4 2 16 15 14 13 12 11 10 9
PWR HDD DC SW IrDA Speaker
2
1 3 5 6 8 9 111213141516 17 1920 22

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q9: HPD Indicator Header (CN73) (TG Option)
Pin Signal description
1NC
2GND
3LED POWER
4NC
5LED POWER
6HDDaccesssignal
7GND
8Power-ONswitchsignal
q10 : Aux. Indicator Header (CN49) (Option)
Pin Signal description Pin Signal description
1Key lock Signal to Super I/O 2GND
3Key 4Reset signal
5GND 6Key
7SleepFunctionsignal 8GND
q11 : Front Audio Control Connector (CN75) (Option) (Do not used in ATX form Factor)
Pin Signal description
1LEFT_MIC_INPUT
2+5VA
3AGND
4RIGHT_DAC_OUT
5LEFT_DAC_OUT
6AGND
7NC
8NC
q12 : Front USB(3’rd) Connector (CN74) (Option) (Do not used in ATX form Factor)
Pin Signal description
1VCC
2Negative DATA
3Positive DATA
4GND
q13 : USB(4’rd) Connector (CN76) (Option)
Pin Signal description
1NC
2GND
3Positive DATA
4VCC
5Negative DATA
Sleep Reset Keylock
8 7 5 4 12
1 2 3 4
Front USB (CN44)
1 2 3 4 5 4 6 7 8
Front Audio (CN75)
PWR HDD DC/SW
7 865321
3 2 1
4 5

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q14 ; PC/PCI connector (CN23) ; Support Only SER_IRQ Pin
Pin Signal description Pin Signal description
1N.C 4N.C
2GND 5N.C
3N.C 6SER_IRQ
q15 ; Video Sound (CN45)
Pin Signal description Pin Signal description
1Left Input Sound 3GND
2GND 4Right Input Sound
2 4 6
1 3 5
1 2 3 4

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2-2. Motherboard External I/O Port
1. Joystick/MIDI 5.SerialPort(COM2)
2. Speak 6. SerialPort(COM1)
3. Line-IN 7.USB
4. MIC 8.Keyboard
9. Mouse
1
3
4
2
56
7
9
8

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Other product names used in this publication are for identification purpose only and may be trademarks of their
respective companies.