Acrosser AR-B1891 User Manual

AR-B1891

Socket 479 Pentium® M

INDUSTRIAL GRADE

CPU BOARD

User’ s Guide

Edition: 1.0

Book Number: AR-B1891-05.1107

Table of Contents

0. PREFACE....................................................................................................................................................................1

0.1 COPYRIGHT NOTICE AND DISCLAIMER.....................................................................................................................................1

0.2 WELCOME TO THE AR-B1891 CPU BOARD................................................................................................................................1

0.3 BEFORE YOU USE THIS GUIDE...................................................................................................................................................1

0.4 RETURNING YOUR BOARD FOR SERVICE.................................................................................................................................1

0.5 TECHNICAL SUPPORT AND USER COMMENTS........................................................................................................................2

0.6 STATIC ELECTRICITY PRECAUTIONS ........................................................................................................................................3

1. INTRODUCTION..........................................................................................................................................................3

1.1 PACKING LIST................................................................................................................................................................................3

1.2 SPECIFICATIONS...........................................................................................................................................................................4

1.3 BLOCK DIAGRAM...........................................................................................................................................................................5

2. INSTALLATION........................................................................................................................................................... 6

2.1 AR-B1891'S BOARD DIMENSIONS ...............................................................................................................................................6

2.2 CPU INSTALLATION ......................................................................................................................................................................8

2.3 MEMORY INSTALLATION..............................................................................................................................................................9

3. CONNECTION........................................................................................................................................................... 10

3.1 PS2 KEYBOARD & MOUSE（KBMS1）......................................................................................................................................10

3.2 USB CONNECTOR（USB1） ......................................................................................................................................................10

3.3 EXTERNAL USB HEADER（USB3）...........................................................................................................................................11

3.4 PARALLEL PORT CONNECTOR（LPT1） .................................................................................................................................11

3.5 SERIAL PORT CONNECTOR（COM1） .....................................................................................................................................12

3.6 EXTERNAL SERIAL PORT HEADER（COM2） .........................................................................................................................12

3.7 VGA CONNECTOR （VGA1） ....................................................................................................................................................12

3.8 RJ- 45 &USB CONNECTOR（CN2）...........................................................................................................................................13

3.9 AUDIO LINE OUT∕LINE IN∕MIC HEADER（J4） ....................................................................................................................13

3.10 CD IN HEADER（J6）................................................................................................................................................................13

3.11 HARD DISK（IDE）CONNECTOR (IDE1, IDE2).......................................................................................................................14

3.12 COMPACT FLASH CONNECTOR（CFB1） .............................................................................................................................16

3.13 COMPACT FLASH CONNECTOR MASTER∕SLAVE SELECT HEADER（JP3） ..................................................................17

3.14 CPU CLOCK SELECT HEADER（JCLK1） ..............................................................................................................................17

3.15 INTERNAL BUZZER（BZ1）......................................................................................................................................................17

3.16 CPU FAN POWER CONNECTOR（FAN1, FAN2, FAN3） .......................................................................................................17

3.17 COMS BATTERY HEADER（JBAT1） ......................................................................................................................................18

3.18 18, 24 BITS LVDS CONNECTOR（LCD1, LCD4） ...................................................................................................................18

3.19 LVDS INTERVER CONNECTOR（J7, JJ1） .............................................................................................................................19

3.20 LCD PANEL TYPE SELECT （S1）..........................................................................................................................................20

3.21 DDR SDRAM SOCKET（DIMM1, DIMM2）...............................................................................................................................20

3.22 MINI PCI SLOT（MPCIB1） .......................................................................................................................................................20

3.23 PCI SLOT（PCI1） .....................................................................................................................................................................20

3.24 PCI SELECT HEADER（JP2） ..................................................................................................................................................20

3.25 ATX∕ATX_12V POWER CONNECTOR（ATX1, PW1）..........................................................................................................21

3.26 PANEL HEADER（J1）..............................................................................................................................................................21

4. WATCHDOG TIMER CONFIGURATION..................................................................................................................22

4.1 WATCHDOG TIMER SETTING ....................................................................................................................................................22

5. BIOS CONSOLE........................................................................................................................................................23

5.1 MAIN SETUP.................................................................................................................................................................................23

5.2 ADVANCED CHIPSET SETUP.....................................................................................................................................................25

5.3 PERIPHERALS SETUP ................................................................................................................................................................26

5.4 PNP/PCI SETUP...........................................................................................................................................................................27

5.5 PC HEALTH SETUP .....................................................................................................................................................................28

5.6 BOOT SETUP ...............................................................................................................................................................................29

5.7 EXIT SETUP..................................................................................................................................................................................30

5.8 BIOS UPDATE ..............................................................................................................................................................................31

APPENDIX A. ADDRESS MAPPING............................................................................................................................ 32

IO ADDRESS MAP..............................................................................................................................................................................32

Memory Map .......................................................................................................................................................................................32

APPENDIX B. INTERRUPT REQUEST (IRQ)............................................................................................................... 33

1

0. PREFACE

0.1 COPYRIGHT NOTICE AND DISCLAIMER

This document is copyrighted, 2002, by Acrosser Technology Co., Ltd. All rights are reserved. No part
of this manual may be reproduced, copied, transcribed, stored in a retrieval system, or translated into
any language or computer language in any form or by any means, such as electronic, mechanical,
magnetic, optical, chemical, manual or other means without the prior written permission or original
manufacturer.
Acrosser Technology assumes no responsibility or warranty with respect to the content in this manual
and specifically disclaims any implied warranty of merchantability or fitness for any particular purpose.
Furthermore, Acrosser Technology reserves the right to make improvement s to the products described
in this manual at any times without notice. Such revisions will be posted on the Internet

(WWW.ACROSSER.COM)

Possession, use, or copy of the software described in this publication is authorized only pursuant to
valid written license from Acrosser or an authorized sub licensor.

ACKNOWLEDGEMENTS
Acrosser, AMI, IBM PC/AT , ALI, Windows 3.1, MS-DOS…are registered trademarks.

All other trademarks and registered trademarks are the property of their respective owners.

0.2 WELCOME TO THE AR-B1891 CPU BOARD

This guide introduces the Acrosser AR-B1891 CPU Board.
Use information provided in this manual describes this card’s functions and features. It also helps you
start, set up and operate your AR-B1891. General system information can also be found in this
publication.

0.3 BEFORE YOU USE THIS GUIDE

Please refer to the Chapter 3, “Setting System,” in this guide, if you have not already installed this
AR-B1891. Check the packing list before you install and make sure the accessories are completely
included.
AR-B1891 CD provides the newest information regarding the CPU card. Please refer to the files of
the enclosed utility CD. It contains the modification and hardware & software information, and adding
the description or modification of product function after manual printed.

0.4 RETURNING YOUR BOARD FOR SERVICE

If your board requires any services, contact the distributor or sales representative from whom you
purchased the product for service information. If you need to ship your board to us for service, be sure
it is packed in a protective carton. We recomm end that you keep the original shipping container for this
purpose.
You can help assure efficient servicing for your product by following these guidelines:

1. Include your name, address, daytime telephone, facsimile number and E-mail.

2. A description of the system configuration and/or software at the time of malfunction.

3. A brief description of the problem occurred.

as soon as possible.

1

0.5 TECHNICAL SUPPORT AND USER COMMENTS

Users comments are always welcome as they assist us in improving the quality of our product s and the
readability of our publications. They create a very important part of the input used for product
enhancement and revision.
We may use and distribute any of the information you provide in any way appropriate without incurring
any obligation. You may, of course, continue to use the information you provide.
If you have any suggestions for improving particular sections or if you find any errors on it, please send
your comments to Acrosser Technology Co., Ltd. or your local sales representative and indicate the
manual title and book number.
Internet electronic mail to: [e-mail]

[e-mail]

0.6 STATIC ELECTRICITY PRECAUTIONS

Before removing the board from its anti-static bag, read this section about static electri city precautions.
Static electricity is a constant danger to computer systems. The charge that can build up in your body
may be more than sufficient to damage integrated ci rcuits on any PC board. It is, therefore, important to
observe basic precautions whenever you use or handle computer components. Although areas with
humid climates are much less prone to static build-up, it is always best to safeguard against accidents
that may result in expensive repairs. The following measures should be sufficient to protect your
equipment from static discharge:
 Touch a grounded metal object to discharge the static electricity in your body (or ideally, wear a

grounded wrist strap).

 When unpacking and handling the board or other system components, place all materials on an

anti-static surface.

 Be careful not to touch the components on the board, especi ally the “golden finger” connectors on

the bottom of the board.

1. INTRODUCTION

Welcome to the AR-B1891 Embedded ATX Single Board Computer. The AR-B1891 Pentium® M
embedded board incorporates the Intel
600MHz to 2.0MHz in 479-ball Micro-FCBGA package with a front size bus of 400MHz.

Graphics display functionality is provided by the ATI mobility chipset VGA controller that supports CRT
display and LVDS interface with 24-bit panel specifications. Ethernet connectivity comes from the
ICH4-integrated Ethernet 10/100 Ethernet controller.

Two DDR DIMM socket s support s up to 2GB of memory. Two Serial ports are supported. There are two
IDE connectors – IDE1 supporting UDMA33/66/100 and IDE2 with UDMA33 while supporting a CF
Type II socket for its slave channel.

Other I/O features include four USB ports connector and two USB port using pin headers. Expansion
slots composed of one PCI and one Mini PCI slot. AR-B1891 uses a 20-pin ATX power and a 4 pin
+12V input connector.

1.1 PACKING LIST

In addition to this User's Manual, the AR-B1891 package includes the following items:

 The quick setup manual
 AR-B1891 Embedded ATX Single Board
 Software utility CD x 1
 5.25” IDE HDD ATA 100Cable x 1（Part NO.190030363-02）

 2.5” IDE HDD Cable x 1（Part NO.190030079）
 Serial port Cable x 1（Part NO.190030191）
 Audio interface Cable x 1（Part NO.190030403）
 USB port Cable x 1（Part NO.190030343-01,Option）


®

advanced 855GME Chipset that supports processors from

1.2 SPECIFICATIONS

Model Name AR-B1891
CPU Type Intel Pentium M Processor, Ultra Low Voltage, at HFM

CPU Voltage 0.700 ~ 1.708V
CPU Frequency 400MHz
Chipset

BIOS Award BIOS, support ACPI function
Cache 1M Level 2 cache
Display

LAN

Audio ICH4 Built-in Sound controller + AC97 code ALC202A

Memory Type

LPC I/O Winbond 83627HF

RTC/CMOS ICH4 Built-in
Battery Lithium Battery
KB&MS Controller Winbond 83627HF built-in keyboard & mouse

IDE ICH4 Built-in

Compact Flash Type II, using IDE2 channel
USB

WatchDog T i mer 0~60sec
Power Connector 20-pin ATX Power input + The Pentium 4 ATX power

Expansion Slots PCI slot x1, MiniPCI slot x1
From factor 240x190mm

core frequency of 600MHz ~ 2.0GHz（Socket 478）

GMCH：Intel 82855GME, 732-pin Micro-FCBGA
ICH4：Intel 82801DB, 421-pin BGA, FWH

GRAPHICS：ATI Mobility RADEON 9000
Support CRT D-SUB 15-pin female connector
Support One LVDS interface（DF13 Socket, Max
24bit﹚

ICH4 integrated LAN controller﹙10/100Mb﹚+ Phy
Intel 85856ET&RJ45 connector

2 channel﹙Line-out, Line-in,MIC.﹚ pin header

﹙

2x6pin, pitch 2.54mm﹚

2 x DDR 184-pin DIMM 2.5V﹙DDR200/233/333MHz﹚,
Max. capacity 2GB

1. support Parallel Port x 1﹙D-SUB 25-pin﹚

2. support series Port x 2﹙COM1：D-SUB 9-pin,
COM2：pin header 2x5-pin pitch 2.0﹚

3. support Hardware monitor

controller﹙PS2 &6-pin MINI-DIN﹚

1. IDE1, 40-pin box header﹙UDMA 33/66/100﹚

2. IDE2, 44-pin box header﹙UDMA 33﹚

6 port, USB 2.0/1.1, ﹙Rear I/O panel﹚,& 2x10-pin
header pitch 2.54mm

include another 2x2 pin+12V input connector

1.3 BLOCK DIAGRAM

LVDS I/F
(9)

PANEL
(LCD4 )

R,G,B I/F
(10)

RJ45

CRT
(VGA1)

PANEL
(LCD1)

LAN Diff (7)

ATI
REDAON
(UA 1 )

R,G,B I/F (10)

LVDS I/F (9)

LAN
82562EM
(U12)

USB

2.0 *
6

AGP
Bus(3)

LAN PHY (6)

USB 2.0 (8)

Intel Pentium M Processer
Socket_478 (U6)

HOST
BUS(3)

Intel 855GME
(U7)

HUB LINK(4)

Intel ICH4
(U14)

DDR
BUS(2)

AC'97 LINK

ATA 100 (5)

ATA 100 (5)

PCI BUS

DDR I SOCKET* 2
200/266/333 MHz

AC'97 CODEC (U18)

IDE1 PRIMARY

IDE SECONDARY
,COMPACT FLASH

PCI SLOT , MINI
PCI SLOT

FWH

LPC BUS

Bios
(U22)

Super I/O
W83627HF (U17)

KEYBOARD

PARALLEL SERIAL 1MOUSE

SERIAL 2

2. INSTALLATION

This chapter describes how to install the AR-B1891. At first, the layout of AR-B1891 is shown, and the
unpacking information that you should be careful is described. The jumpers and switches setting for the
AR-B1891’s configuration are as below.

2.1 AR-B1891'S BOARD DIMENSIONS

2.2 CPU INSTALLATION

The AR-B1891 embedded board supports a Socket 479 processor socket for Intel

Celeron

®

M processors.

®

Pentium® M or

The processor socket comes with a screw to secure the processor. As shown in the left picture below,

loosen the screw first before inserting the processor. Place the processor into the socket by making sure
the notch on the corner of the CPU corresponds with the notch on the inside of the socket. Once the
processor has slide into the socket, fasten the screw. Refer to the figures below.

After you have installed the processor into the socket, check if the jumpers for the CPU type and speed are
correct.

2.3 MEMORY INSTALLATION

The AR-B1891 embedded board supports two DDR memory sockets for a maximum total memory of
2GB in DDR memory type. The memory module capacities supported are 64MB, 128MB, 256MB,
512MB and 1GB. The following table lists the supported DDR DIMM configurations. Intel 855GME
supports configurations defined in the JEDEC DDR DIMM specification only (A,B,C). Non-JEDEC
standard DIMMs such as double-sided x16 DDR SDRAM DIMMs are not supported.

Density 64M bit 128Mbit 256Mbit 512Mbit

Device

X8 X16 X8 X16 X8 X16 X8 X16

Width
Single/

SS/DS SS/DS SS/DS SS/DS SS/DS SS/DS SS/DS SS/DS

Double
184-pin
DDR

Supported DDRM DIMM Configurations

To install the DDR modules, locate the memory slot on the embedded board and perform the following
steps:

1. Hold the DDR module so that the key of the DDR module align with those on the memory slot.

2. Gently push the DDR module in an upright position until the clips of the slot close to hold the DDR
module in place when the DDR module touches the bottom of the slot.

3. To remove the DDR module, press the clips with both hands.

64M /
128M

32M /
NA

128M/
256M

64M /
NA

256M/
512M

128M/
NA

256M/
1024M

256M/
NA

3. CONNECTION

The connectors on AR-B1891 allows you to connect external devices such as USB devices, serial port
drives, hard disk devices, printers, etc. The following table lists the connectors on AR-B1891 and their
respective functions.

3.1 PS2 KEYBOARD & MOUSE（KBMS1）

To install a PS/2 port keyboard and mouse, plug the mouse to the upper port（green）and the keyboard to the
lower port（purple）.

PIN SIGNAL PIN SIGNAL

12 11

10

8

7

9

PS2
MOUSE

1 KBDAT 7 MSDAT
2 N.C. 8 N.C.

6 5

4

12

KB MS1

3

PS2
KEYBOARD

4 +5V 10 +5V
5 KBCLK 11 MSCLK
6 N.C. 12 N.C.

3 GND 9 GND

3.2 USB CONNECTOR（USB1）

Before you connect your device into USB connectors, please make sure your devices such as USB

keyboard, mouse, scanner, zip, speaker …etc. have a standard USB interface, Also make sure your OS
supports USB controller. If your OS doesn’t support USB controller, please contact OS vendor for
possible patch or driver upgrade. For more information please contact your OS or devices vendors.

PIN SIGNAL PIN SIGNAL

5 6 7

1 2 3 4

8

1 +5V 5 +5V
2 USB2- 6 USB3­3 USB2+ 7 USB3+

USB1

4 GND 8 GND

3.3 EXTERNAL USB HEADER（USB3）

The following table shows the pin out s of the USB pin headers conn ectors. Overall, the two pin headers
support four USB ports（USB 2.54 compliant）.

9

10 2

USB3

1

PIN SIGNAL PIN SIGNAL

1 +5V 2 +5V
3 USB4- 4 USB5­5 USB4+ 6 USB5+
7 GND 8 GND

3.4 PARALLEL PORT CONNECTOR（LPT1）

The parallel port allows connection of a printer, scanner and other peripheral devices.

PIN SIGNAL PIN SIGNAL

1 STB# 14 AFD#
2 PD0 15 ERROR#
3 PD1 16 INIT#
4 PD2 17 SLIN#
5 PD3 18 GND
6 PD4 19 GND
7 PD5 20 GND
8 PD6 21 GND

9 PD7 22 GND
10 ACK# 23 GND
11 BUSY# 24 GND
12 PE 25 GND
13 SLCT

LPT1

3.5 SERIAL PORT CONNECTOR（COM1）

Devices like mouse, modems …etc, can be connected to serial port.

1 5

69

COM1

PIN SIGNAL PIN SIGNAL

1 DCDA 6 DSRA

2 RXDA 7 RTSA

3 TXDA 8 CTSA

4 DTRA 9 RIA

5 GND

3.6 EXTERNAL SERIAL PORT HEADER（COM2）

The following table describes the pin out assignments of this connector.

9

1

PIN SIGNAL PIN SIGNAL

1 DCDB 6 DSRB
2 RXDB 7 RTSB

10 2

COM 2

3 TXDB 8 CTSB
4 DTRB 9 RIB
5 GND 10 GND

3.7 VGA CONNECTOR （VGA1）

Monitor can be connected to VGA port.

VGA1

PIN SIGNAL PIN SIGNAL

1 RED 9 +5V
2 GREEN 10 GND
3 BLUE 11 N.C.
4 N.C. 12 SDA
5 GND 13 HSYNC
6 GND 14 VSYNC
7 GND 15 SCL
8 GND

3.8 RJ- 45 &USB CONNECTOR（CN2）

The provided Internet connection is fast Ethernet, providing data transfer speeds of 10/100Mbps. Plug
the Ethernet to the upper port and USB devices to the lower port.

PIN SIGNAL PIN SIGNAL

1 TX+ 9 +5V

1 8

2 TX- 10 USB0­3 RX+ 11 USB0+

13 14 15 16

11

9 10

12

CN2

4 N.C. 12 GND
5 N.C. 13 +5V
6 RX- 14 USB1­7 N.C. 15 USB1+
8 N.C. 16 GND

3.9 AUDIO LINE OUT⁄LINE IN⁄MIC HEADER（J4）

Include Line out, Line in, and MIC. Devices like CD-ROM, walkman etc. can be connected to line in.

Connect the speaker, earphone to line out. Microphone can be connected to MIC.

2 12

PIN SIGNAL PIN SIGNAL

1 R_OUT 7 GND
2 L_OUT 8 GND
3 GND 9 MIC_IN

1 11

J4

4 GND 10 GND
5 R_IN 11 N.C.
6 L_IN 12 +12V

3.10 CD IN HEADER（J6）

Connect CD-ROM or DVD-ROM audio out to the connector.

14

J6

PIN SIGNAL PIN SIGNAL

1 CD_L 3 GND
2 GND 4 CD_R

3.11 HARD DISK（IDE）CONNECTOR (IDE1, IDE2)

An IDE device connects to the computer via an IDE connector. One IDE connector can connect to one
IDE cable, and the single IDE cable can then connect to two IDE device s (hard drive or optical drive ). If
you wish to connect two IDE devices, please set the jumper on one IDE device as Master and the other
as Slave.

2 40

1 39

IDE1 ：Primary IDE Channel

PIN SIGNAL PIN SIGNAL

1 IDERST 2 GND
3 PDATA7 4 PDATA8
5 PDATA6 6 PDATA9
7 PDATA5 8 PDATA10

9 PDATA4 10 PDATA11
11 PDATA3 12 PDATA12
13 PDATA2 14 PDATA13
15 PDATA1 16 PDATA14
17 PDATA0 18 PDATA15
19 GND 20 N.C.
21 PDDREQ 22 GND
23 PDDIOW 24 GND
25 PDDIOR 26 GND
27 PIORDY 28 GND
29 PDDACK 30 GND
31 IRQ14 32 N.C.
33 PDA1 34 P66DET
35 PDA0 36 PDA2
37 PDCS1 38 PDCS3
39 HDDLED 40 GND

2 44

1 43

IDE2 ：Secondary IDE Channel

PIN SIGNAL PIN SIGNAL

1 IDERST 2 GND
3 SDATA7 4 SDATA8
5 SDATA6 6 SDATA9
7 SDATA5 8 SDATA10

9 SDATA4 10 SDATA11
11 SDATA3 12 SDATA12
13 SDATA2 14 SDATA13
15 SDATA1 16 SDATA14
17 SDATA0 18 SDATA15
19 GND 20 N.C.
21 SDDREQ 22 GND
23 SDDIOW 24 GND
25 SDDIOR 26 GND
27 SIORDY 28 GND
29 SDDACK 30 GND
31 IRQ15 32 N.C.
33 SDA1 34 S66DET
35 SDA0 36 SDA2
37 SDCS1 38 SDCS3
39 HDDLED 40 GND
41 +5V 42 +5V
43 GND 44 N.C.

3.12 COMPACT FLASH CONNECTOR（CFB1）

50 1

CFB1 ：Secondary IDE Channel

PIN SIGNAL PIN SIGNAL

1 GND 2 SDATA3
3 SDATA4 4 SDATA5
5 SDATA6 6 SDATA7
7 SDCS1 8 GND

9 GND 10 GND
11 GND 12 GND
13 +5V 14 GND
15 GND 16 GND
17 GND 18 SDA2
19 SDA1 20 SDA0
21 SDATA0 22 SDATA1
23 SDATA2 24 GND
25 GND 26 GND
27 SDATA11 28 SDATA12
29 SDATA13 30 SDATA14
31 SDATA15 32 SDCS3
33 GND 34 SDDIOR
35 SDDIOW 36 +5V
37 IRQ15 38 +5V
39 M/S SELECT 40 N.C.
41 IDERST 42 SIORDY
43 N.C. 44 +5V
45 HDDLED 46 N.C.
47 SDATA8 48 SDATA9
49 SDATA10 50 GND

※ Compact Flash (CFB1) and IDE 2 share the same channel. Since a Compact Flash card is installed in
the socket, the IDE 2 device will become unusable. CF card & IDE2 device cannot use at the same time.

3.13 COMPACT FLASH CONNECTOR MASTER⁄SLAVE SELECT HEADER（JP3）

Set the jumper on one compact flash device as Master and the other as Slave.

1

PIN SIGNAL

1-2 ON MASTER MODE

JP3

1-2 OFF

3.14 CPU CLOCK SELECT HEADER（JCLK1）

1

JCLK1

PIN SIGNAL

1-2 ON 133 MHZ

2-3 ON

3.15 INTERNAL BUZZER（BZ1）

SLAVE MODE

（Factory Preset）

100 MHZ

（Factory Preset）

PIN SIGNAL

1 +5V

BZ1

2 SPEAK

3.16 CPU FAN POWER CONNECTOR（FAN1, FAN2, FAN3）

FAN1, FAN2, FAN3 is a three pin header for system fans. These fans power supplies +12V power voltage.

FAN1, FAN2, FAN3

1

PIN SIGNAL

1 GND
2 +12V
3 SENSE

3.17 COMS BATTERY HEADER（JBAT1）

You may clear the COMS data to its default values by this jumper. To clear COMS, temporarily short
pins 1-2. To prevent improper use of this header, we do not include a jumper on it.

1

JBAT1

PIN SIGNAL

1-2 ON

2-3 ON CLEAR CMOS

NORMAL OPERATION

（Factory Preset）

3.18 18, 24 BITS LVDS CONNECTOR（LCD1, LCD4）

The LVDS connector is composed of this channel to support 18-bit.This device is an alternative.

PIN SIGNAL PIN SIGNAL

1 VCC_LVDS 2 GND
3 RXEC- 4 RXEC+
5 GND 6 RXE2­7 RXE2+ 8 GND

9 RXE1- 10 RXE1+
11 RXE3+ 12 RXE3­13 RXE0+ 14 RXE0­15 GND 16 RXOC+
17 RXOC- 18 GND
19 RXO2+ 20 RXO2­21 DDCLK 22 RXO1+
23 RXO1- 24 DDDATA
25 RXO0+ 26 RXO0­27 RXO3+ 28 RXO3­29 VCC_LVDS 30 VCC_LVDS

※The device for Intel 855GME chipset, and only support LVDS 18 Bits.

LCD1

PIN SIGNAL PIN SIGNAL

1 VCC_LVDS 2 GND
3 RXEC- 4 RXEC+
5 GND 6 RXE2­7 RXE2+ 8 GND

9 RXE1- 10 RXE1+
11 RXE3+ 12 RXE3­13 RXE0+ 14 RXE0­15 GND 16 RXOC+
17 RXOC- 18 GND
19 RXO2+ 20 RXO2­21 DDCLK 22 RXO1+
23 RXO1- 24 DDDATA
25 RXO0+ 26 RXO0­27 RXO3+ 28 RXO3­29 VCC_LVDS 30 VCC_LVDS

※The device for ATI chipset.

3.19 LVDS INTERVER CONNECTOR（J7, JJ1）

This device is an alternative.

1

J7

※The device for Intel 855GME chipset.

1

JJ1

※The device for ATI chipset.

PIN SIGNAL PIN SIGNAL

1 +12V 4 BKLTEN
2 +12V 5 GND
3 GND 6 BKLTCL

PIN SIGNAL PIN SIGNAL

1 +12V 4 BLON
2 +12V 5 GND
3 GND 6 N.C.

LCD4

3.20 LCD PANEL TYPE SELECT （S1）

The switch can to select the LCD panel type.

1 2 3 4

PIN1 PIN2 PIN3 PIN4 SIGNAL

ON OFF OFF N.C. 800X600 18Bit

OFF ON OFF N.C. 1024X768 24Bit

OFF

S1

ON ON OFF N.C. 1024X768 18Bit

OFF OFF ON N.C.

1280X1024 18Bit

N.C. N.C N.C. OFF ATI M9 CRT

3.21 DDR SDRAM SOCKET（DIMM1, DIMM2）

The board has 2 dual inline memory module（DIMM）sockets.

3.22 MINI PCI SLOT（MPCIB1）

The board has one mini PCI slot.

3.23 PCI SLOT（PCI1）

The board has one PCI slot.

3.24 PCI SELECT HEADER（JP2）

You can be set the jumper on one PCI slot as Riser card and the other as PCI device.

1

JP2

PIN SIGNAL

1-2 ON

ONE PCI CARD

（Factory Preset）

2-3 ON RISER CARD

2ch

3.25 A TX⁄ATX_12V POWER CONNECTOR（ATX1, PW1）

With the use of the power connector, the power supply can enough stable power to all the components on
the board. Before connecting the power connector, please make sure that all components and devices are
properly installed. Align the power connector with its proper location on the board and connect tightly.
The ATX_12V（PW1）power connector mainly supplies power to the CPU. If the ATX_12V（PW1）power

connector is not connected, the system will not start.

11

1

ATX1

20

10

PIN SIGNAL PIN SIGNAL

1 +3.3V 11 +3.3V
2 +3.3V 12 -12V
3 GND 13 GND
4 +5V 14 PSON
5 GND 15 GND
6 +5V 16 GND
7 GND 17 GND
8 PWOK 18 -5V
9 +5VSB 19 +5V

10 +12V 20 +5V

PIN SIGNAL

1 GND
2 GND
3 +12V

PW1

4 +12V

3.26 PANEL HEADER（J1）

Please connect the power LED, IDE Hard disk active LED, reset switch and power switch etc.

2 8

1 7

J1

PIN SIGNAL

1-3 POWER BUTTON
5-7 RESET BUTTON
2-4 POWER LED

6-8 HDD LED

4. WATCHDOG TIMER CONFIGURATION

The WDT（Watch Dog Timer）is used to generate a variety of output signals after a user progra mmable count.
The WDT is suitable for use in the prevention of system lock-up, such as when software beco mes trapped i n

a deadlock. Under these sort of circumstances, the timer will count to zero and the selected outputs will be
driven. Under normal circumstance, the user will restart the WDT at regular intervals before the timer counts
to zero.

4.1 WATCHDOG TIMER SETTING

The watchdog timer is a circuit that maybe be used from your program software to detect crash or hang up.
The Watchdog timer is automatically disabled after reset. Once you enabled the watchdog timer, your
program should trigger the watchdog timer every time before it times out. After you trigger the watchdog
timer, the timer will be set to zero and start to count again. If your program fails to trigger the watchdog timer
before times out, it will generate a reset pulse to reset the system or trigger the IRQ 9 signal in order to tell
your system that the watchdog time is out.

Users could test watchdog function under ‘Debug’ program as follows:

C:>debug

o 2e 87 ;Extended Functions Enable Register

o 2e 87 ;Extended Functions Enable Register

o 2e 07 ;EFIR=EF ER (Extended Functions Index Register)
point to Logical Device Number Reg.

o 2f 08 ;EFDR=EFIR+1,select logical device 8

o 2e 30 ;selec t CR30

o 2f 01 ;update CR30 with value 01H

o 2e f6 ;select CRF6

o 2f 08 ;update CRF 6 with value 08H ,(8sec reset)

q

5. BIOS CONSOLE

This chapter describes the AR-B1891 BIOS menu displays and exp lains how to perform common t asks
needed to get up and running, and presents detailed e xplanations o f the elements found in each of the
BIOS menus. The following topics are covered:

z Main Setup
z Advanced Chipset Setup
z Peripherals Setup
z PnP/PCI Setup
z PC Health Setup
z Boot Setup
z Exit Setup

5.1 MAIN SETUP

The <Main Setup> choice allows you to record some basic hardware configuration in your computer
system and set the system clock and error handling. If the motherboard is already inst alled in a working
system, you will not need to select this option. You will need to run this Setup option, however, if you
change your system hardware configuration, the onboard battery fails, or the configuration stored in the
COMS memory was lost or damaged.

Setup Main Menu

About the button of the menu are the control keys for use on this menu. If you need any help in each
item field, you can press the ＜F1＞ key, It will display the relevant information to help you. The

memory display at the automatically according to the memory changed. The following describes each
item of this menu.

Date Setup

The date format is：

DAY：SUN to SAT
Month：1 to 12
Date：1 to 31

Year：1999 to 2099
To set the date, highlight the “Date” field and use the 【PageUp】/【PageDown】or 【+】/【-】keys to
set the current time.

Time Setup

The time format is：

Hour：SUN to SAT

Minute：00 to 59

Second：00 to 59
To set the time, highlight the “Time” field and use the 【PageUp】/【PageDown】or 【+】/【-】keys to
set the current time.

IDE Primary HDDs⁄IDE Secondary HDDs

The onboard PCI IDE connectors provide primary and secondary channels for connecting up to four
IDE hard disks or other devices. Each channel can support up to two hard disks; the first is the “Master”
and the second is “Slave”.
Press＜Enter＞ to configure the hard disk. The selections include Auto, Manual, and None. Select

“Manual＂ to define the device information manually. You will be asked to enter the following items.
CYLS：Number of cylinders.

HEAD：Number of read/write heads.
PRECOMP：Write precompensation.
LANDING SONE：Landing zone.
SECTOR：Number of sectors.
The Access Mode selections are as follows：

CHS：（HD<528MB）
LBA：（HD>528MB and support Logical Block Addressing）
Large：（for MS-DOS only）
Auto

Video

The field selects the type of video display card installed in your system. You can choose the following video
display cards：

EGA/VGA：For EGA, VGA, SEGA, SVGA or PGA monitor adapters.（default）
CGA 40：Power up in 40 column mode.
CGA 80：Power up in 80 column mode.
MONO：For Hercules or MDA adapters.

Halt On

The field determines whether or not the system will halt if an error is detected during the power up.
No errors：The system boot will not be halted for any error that may de detected.

All errors：Whenever the BIOS detects a non-fatal error, the system will stop and you will be prompted.
All, But Keyboard：The system boot will not be halted for a keyboard error; it will stop for all other errors.

5.2 ADVANCED CHIPSET SETUP

This section allows you to configure and improve your system and follows you to set up some system
features according to your preference.

Advanced Chipset Setup

APIC Mode

APIC stands for Advanced Programmable Interrupt Controller. The default setting is Disabled.

Quick Power On Self Test

When enabled, this field speeds up the Power On Self Test（POST）after the system is turned on. If it is set
to Enable, BIOS will skip some items.

USB Keyboard Support

The options for this field are Enabled and Disabled. By default, the field is set to Disabled.

PS/2 Mouse Function

The options for this field are Enabled and Disabled. By default, the field is set to Disabled.

Init Display First

The default setting is Onboard/AGP. This determines which VGA controller is initialized when the system
boots.

ACPI Function

Enable this function to support ACPI（Advance Configuration and Power Interface）.

ACPI Suspend Type

（

The options for this field are S1

PWRON After PWR-Fail

The field sets the system power status whether on or off when power returns from a power failure situation.

POS）and S3（STR）. By default, the field is set to S1（POS）.

5.3 PERIPHERALS SETUP

This option controls the configuration of the board’s chipset. Control keys for this screen are the same
as for the previous screen.

Peripherals Setup

Onboard Serial Port 1
Onboard Serial Port 2

These fields allow you to select the on board serial ports and their addresses. The default values for
these ports are：

Serial Port 1：3F8 / IRQ4
Serial Port 2：2F8 / IRQ3

Onboard Parallel Port

This field allow you to select the on board parallel port and their addresses. The default values for this
port is：

Parallel Port：378 / IRQ7

Parallel Port Mode

This field allow you determine parallel port mode function：
SSP：Standard Parallel Port
EPP：Enhanced Parallel Port
ECP：Extended Capabilities Port

USB Controller

The options for this field are Enabled and Disabled. By default, the field is set to Enabled.

USB 2.0 Controller

The options for this field are Enabled and Disabled. By default, the field is set to Enabled. In order to
use USB 2.0, necessary OS drivers must be installed first. Please update your system to Windows
2000 SP4 or Windows XP SP1.

AC97 Audio

The default setting of the AC97 Audio is Auto.

Onboard Lan Controller

The default setting of the Lan controller is Enabled.

5.4 PNP/PCI SETUP

The option configures the PCI bus system. All PCI bus system on the system use INT#, thus all
installed PCI cards must be set to this value.

PnP / PCI Setup

Reset Configuration Data

This field allow you to determine whether to reset the configuration data or not. The default value is
Disabled.

Resources Controlled By

This PnP BIOS can configure all of the boot and compatible devices automatically with the use of a use
a PnP operating system such as Windows 95.

5.5 PC HEALTH SETUP

This section shows the parameters in determining the PC Health Status. These parameters include
temperatures, fan speeds, voltages.

PC Health Status

Temperature / Voltage

These fields are parameters of the hardware monitoring function feature of the motherboard. The
values are read-only values as monitored by the system and show the PC health status.

Shutdown Temperature

This field allows the user to set the temperature by which the system automatically shut do wn once the
threshold temperature is reached. This function can help prevent damage to the system that is caused
by overheating.

5.6 BOOT SETUP

This section is used to exit the BIOS main menu. After making your cha nges, you can either sa ve them
or exit the BIOS menu and without saving the new values

PCI / Plug And Play

First / Second / Third Boot Device

These fields determine the device that the system searches first for an operating system. The option
available include Hard Disk, CDROM, USB-FDD, USB-CDROM and Disable.

Boot Other Device

These fields allow the system to search for an OS from other devices other than the ones selected in
the First / Second / Third Boot Device.

5.7 EXIT SETUP

This section is used to configure exit mode.

Exit Setup

Save & Exit Setup

This option allow you determine whether or not to accept the modifications. If you type “Y”, You will quit
the setup utility and save all changes into the CMOS memory. If you type “N”, you will return to setup
utility.

Load Optimized Defaults

This option allow you to load the default values to your system configuration. These default settings are
optimal and enable all high performance features.

Exit Without Saving

Select this option to exit the Setup utility without saving the changes you have made in this session.
Typing “Y” will quit the Setup utility without saving the modifications. Typing “N” will return to setup
utility.

5.8 BIOS UPDATE

The BIOS program instructions are contained within computer chips called FLASH ROMs that are
located on your system board. The chips can be electronically reprogrammed, allowing you to
upgrade your BIOS firmware without removing and installing chips.
The AR-B1891 provides the FLASH BIOS update function for you to easily to update to a newer BIOS
version. Please follow these operating steps to update to new BIOS：

Step 1:
Step 2:
Step 3:

Step 4:

Step 5:
Step 6:
Step 7:
Step 8:

Note：

Turn on your system and don’t detect the CONFIG.SYS and AUTOEXEC.BAT files.
You will get AWDFLASH.EXE and XXXXXX.BIN , please copy them to the boot disk .
In the MS-DOS mode, you can type the AWDFLASH and press [ ENTER ] .

AWDFLASH

A:\>

A window will appear and ask you to type the complete BIOS file ( xxxxxx.BIN ) and
press [ ENTER ] .

Then it will ask whether you save the old BIOS file , you can choose the YES or NO .
Then it will ask you whether want to program it , please choose YES .
The BIOS will start to upgrade
When you have successfully flashed the BIOS then press the[F1] to reboot the

Computer and hit [DEL] to enter the BIOS CMOS SETTING . Select " LOAD S-STUP
DEFAULTS " set as YES . Then save and exit the setting

1. In order to prevent your system from hanging up during flashing BIOS , please check the new BIOS
match your model name and current BIOS version .

2. In order to protect your motherboard , please don’t turn off your computer during the flashing or it will
damage your BIOS ROM .

APPENDIX A. ADDRESS MAPPING

IO ADDRESS MAP

Each peripheral device in the system is assigned a set of I/O port addresses which also becomes the
identity of the device. The following table list the I/O addresses used.

I/O MAP ASSIGNMENT

0000 - 000F Direct Memory Access contrlooer
0020 - 0021 Programmable interrupt controller
0040 - 0043 System timer
0060 - 0060 Standard 101/102 – key or Microsoft Natural Kayboard
0061 - 0061 System speaker
0070 - 0073 System CMOS/real time clock
00F0 - 00FF Numeric data processor
0170 – 0177 Intel® 82801DB Ultra ATA Storage Controller-24CB
0170 – 0177 Seconda ry IDE Chann el (dual fifo)
01F0 – 01F7 Intel® 82801DB Ultra ATA Storage Controller-24CB
01F0 – 01F7 Primary IDE Channel (dual fifo)
02F8 - 02FF Communication Port (COM2)
0378 - 037F Print Port
0382 - 03BB ATI MOBILITY RADEON 9000
03F8 - 03FF Communication Port (COM1)
C000 - CFFF Intel ® 82852/82855GM/GME/PM/GMV Processor to

AGP controller - 3581
D000 - D03F Intel ® PRO/100 VE Network Connection
E800 - E81F Intel® 82801DB/DBM USB Universal Host Controller
EB00 – EB3F Realtek AC’97 Audio

MEMORY MAP

MEMORY MAP ASSIGNMENT

00000000-0009FFFF System board extension for ACPI BIOS
000A0000-000AFFFF ATI MOBILITY RADEON 9000
000D0000-000D7FFF Unavailable for use by devices
D8000000-DFFFFFFF Intel ® 82852/82855GM/GME/PM/GMV to Processor

I/O controller - 3580

E0000000-E7FFFFFF Intel ® 82852/82855GM/GME/PM/GMV Processor to

AGP controller - 3581
E8100000-E8100FFF Intel ® PRO/100 VE Network Connection
E8100000-E81FFFFF Intel® 82801DB PCI Bridge – 224E
E8200000-E82003FF Intel USB 2.0 Enhanced Host Controller
E8201000-E82011FF Realtek AC’97 Audio

APPENDIX B. INTERRUPT REQUEST (IRQ)

Peripheral devices use interrupt request lines to notify CPU for the services required. The following
table shows the IRQ used by the devices on board.

Level HARDWARE USING THE SETTING
00 System timer
01
02
03
04
05
05
05
07
08
09
09
10
11
12 PS/2 Compatible Mouse Port
13
14
14
15

Standard 101/102-Key or Microsoft Natural Keyboard
Programmable interrupt controller

Communication Port (COM2)
Communication Port (COM1)

ACPI IRQ Holder for PCI IRQ Steering
Realtek AC’97 Audio

Intel® 82801DB/DBM SM Bus Controller-24C3

Print Port (LPT1)
System CMOS/real time clock
ACPI IRQ Holder for PCI IRQ Steering
Intel USB2.0 Enhanced Host Controller

ATI MOBILITY RADEON 9000
Intel ® PRO/100 VE Network Connection

Numeric data processor

Intel® 82801DB Ultra ATA Storage Controller-24CB

Primary IDE controller
Secondary IDE controller

(dual fifo)

(dual fifo)