Advantech GMB-945GC User manual

User Manual
GMB-945GC
Intel® LGA775 Core 2 Duo Mini
ITXMotherboardwithDDR2/Dual
LAN/4COM/PCIe x16

GMB-945GC User Manual ii
Copyright
The documentation and the software included with this product are copyrighted 2008
by Advantech Co., Ltd. All rights are reserved. Advantech Co., Ltd. reserves the right
to make improvements in the products described in this manual at any time without
notice. No part of this manual may be reproduced, copied, translated or transmitted
in any form or by any means without the prior written permission of Advantech Co.,
Ltd. Information provided in this manual is intended to be accurate and reliable. How-
ever, Advantech Co., Ltd. assumes no responsibility for its use, nor for any infringe-
ments of the rights of third parties, which may result from its use.
Acknowledgements
AWARD is a trademark of Phoenix Technologies Ltd.
IBM and PC are trademarks of International Business Machines Corporation.
Intel® Pentium M/Celeron M are trademarks of Intel Corporation.
WinBond is a trademark of Winbond Corporation.
All other product names or trademarks are properties of their respective owners.
Part No. 20060945GC Edition 1
Printed in Taiwan November 2009

iii GMB-945GC User Manual
A Message to the Customer
Advantech Customer Services
Each and every Advantech product is built to the most exacting specifications to
ensure reliable performance in the harsh and demanding conditions typical of indus-
trial environments. Whether your new Advantech equipment is destined for the labo-
ratory or the factory floor, you can be assured that your product will provide the
reliability and ease of operation for which the name Advantech has come to be
known.
Your satisfaction is our primary concern. Here is a guide to Advantech’s customer
services. To ensure you get the full benefit of our services, please follow the instruc-
tions below carefully.
Technical Support
We want you to get the maximum performance from your products. So if you run into
technical difficulties, we are here to help. For the most frequently asked questions,
you can easily find answers in your product documentation. These answers are nor-
mally a lot more detailed than the ones we can give over the phone.
So please consult this manual first. If you still cannot find the answer, gather all the
information or questions that apply to your problem, and with the product close at
hand, call your dealer. Our dealers are well trained and ready to give you the support
you need to get the most from your Advantech products. In fact, most problems
reported are minor and are able to be easily solved over the phone.
In addition, free technical support is available from Advantech engineers every busi-
ness day. We are always ready to give advice on application requirements or specific
information on the installation and operation of any of our products.

GMB-945GC User Manual iv
Declaration of Conformity
FCC
This device complies with the requirements in part 15 of the FCC rules:
Operation is subject to the following two conditions:
This device may not cause harmful interference
This device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class A dig-
ital device, pursuant to Part 15 of the FCC Rules. These limits are designed to pro-
vide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Opera-
tion of this device in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his/her own expense. The
user is advised that any equipment changes or modifications not expressly approved
by the party responsible for compliance would void the compliance to FCC regula-
tions and therefore, the user's authority to operate the equipment.
Caution! There is a danger of a new battery exploding if it is incorrectly installed.
Do not attempt to recharge, force open, or heat the battery. Replace the
battery only with the same or equivalent type recommended by the man-
ufacturer. Discard used batteries according to the manufacturer's
instructions.

v GMB-945GC User Manual
Memory Compatibility
Brand Size Speed Type Vendor Part
Number Advantech Part Number Memory
Transcend
256 MB DDR2
533 SODIMM DDR2 TS32MSQ64V 5M NA Hynix HY5PS121621B FP- Y5 (32x16)
512 MB DDR2
533 SODIMM DDR2 119833-0266 NA Infineon HYB18T512
800AF37 SVV39006 0526
(32x8)
1GB DDR2
533 SODIMM DDR2 120048-0014 NA ELPIDA TWN E5108AE- 5C-E 0517A9105 (64x8)
1GB DDR2
533 SODIMM DDR2 NA NA ELPIDA TWN E5108AE- 5C-E 0511009276 (64x8)
Apacer
256 MB DDR2
533 SODIMM DDR2 78.82054.420 NA ELPIDA JAPAN E5116AB-
5C-E 05050WPWA (64x8)
512 MB DDR2
533 SODIMM DDR2 78.92051.421 96D2-
512M533NN-
AP1
ELPIDA JAPAN E5108AB-
5C-E 04520WR5Q (64x8)
A-DATA
256 MB DDR2
533 SODIMM DDR2 M20SS2F3G34 10A1BOZ NA SAMSUNG 52B
K4T56083QF-GCD5
(32x8)
512 MB DDR2
533 SODIMM DDR2 M20EL2G3H34 10A1BOZ NA ELPIDA JAPAN E5108AB- 5C-E (64x8)
1GB DDR2
533 SODIMM DDR2 M20EL2G3144 30B1BOZ NA ELPIDA TWN E5108AE- 5C-E (64x8)
Transcend
(RoHS)"
256 MB DDR2
667 SODIMM DDR2 TS32MSQ64V 6M NA Hynix HY5PS121621B FP-
Y5 (32x16)
512 MB DDR2
667 SODIMM DDR2 TS64MSQ64V 6J NA SAMSUNG K4T51083QC ZCE6 (64x8)
1GB DDR2
667 SODIMM DDR2 TS128MSQ64 V6J NA SAMSUNG K4T51083QC ZCE6 (64x8)
Apacer
(RoHS)"
512 MB DDR2
667 SODIMM DDR2 78.92G63.422 NA ELPIDA E5108AG-6E-E
(64x8)
1GB DDR2
667 SODIMM DDR2 78.02G63.423 96SD2- 1G667NN-AP ELPIDA E5108AGBG-6E- E (64x8)
DSL
(RoHS)"
256 MB DDR2
667 SODIMM DDR2 NA NA ELPIDA E5116AF-6E-E (32x16)
512 MB DDR2
667 SODIMM DDR2 NA NA ELPIDA E5108AGBG-6E-
E (64x8)
1GB DDR2
667 SODIMM DDR2 NA NA ELPIDA E5108AGBG-6E- E (64x8)
Transcend
(RoHS)" 1GB DDR2 800 SODIMM DDR2 TS128MSQ64 V8J NA HYNIX HY5PS12821E-FP- S5 (64x8)
DSL
(RoHS) 1GB DDR2
800 SODIMM DDR2 NA NA ELPIDA TWN
E5108AHSE-8E-E (64x8)
Note! All the memories tested are Non-ECC (Error Correcting Code) memo-
ries.

GMB-945GC User Manual vi
Ordering Information
Product Warranty (2 years)
Advantech warrants to you, the original purchaser, that each of its products will be
free from defects in materials and workmanship for two years from the date of pur-
chase.
This warranty does not apply to any products which have been repaired or altered by
persons other than repair personnel authorized by Advantech, or which have been
subject to misuse, abuse, accident or improper installation. Advantech assumes no
liability under the terms of this warranty as a consequence of such events.
Because of Advantech’s high quality-control standards and rigorous testing, most of
our customers never need to use our repair service. If an Advantech product is defec-
tive, it will be repaired or replaced at no charge during the warranty period. For out-
of-warranty repairs, you will be billed according to the cost of replacement materials,
service time and freight. Please consult your dealer for more details.
If you think you have a defective product, follow these steps:
1. Collect all the information about the problem encountered. (For example, CPU
speed, Advantech products used, other hardware and software used, etc.) Note
anything abnormal and list any onscreen messages you get when the problem
occurs.
2. Call your dealer and describe the problem. Please have your manual, product,
and any helpful information readily available.
3. If your product is diagnosed as defective, obtain an RMA (return merchandize
authorization) number from your dealer. This allows us to process your return
more quickly.
4. Carefully pack the defective product, a fully-completed Repair and Replacement
Order Card and a photocopy proof of purchase date (such as your sales receipt)
in a shippable container. A product returned without proof of the purchase date
is not eligible for warranty service.
5. Write the RMA number visibly on the outside of the package and ship it prepaid
to your dealer.
GMB-945GC Ordering Information
Part Number On-board
Processor Chipset Memory LAN COM DVI
GMB-945GC-00A1E NA 945GC DDR2 533/
667 24None

vii GMB-945GC User Manual
Initial Inspection
Before you begin installing your motherboard, please make sure that the following
materials have been shipped:
LGA 775 CoreTM 2 Duo/Pentium 4/Pentium dual-core/Celeron® D Processor-
based Mini ITX with DDR2/PCIe/Single GbE LAN
1 x GMB-945GC startup manual
1 x CD with driver utility and manual
2 x Serial ATA HDD data cable
2 x Serial ATA HDD power cable
1 x I/O port bracket
1 x warranty card
If any of these items are missing or damaged, contact your distributor or sales repre-
sentative immediately. We have carefully inspected the GMB-945GC mechanically
and electrically before shipment. It should be free of marks and scratches and in per-
fect working order upon receipt. As you unpack the GMB-945GC, check it for signs of
shipping damage. (For example, damaged box, scratches, dents, etc.) If it is dam-
aged or it fails to meet the specifications, notify our service department or your local
sales representative immediately. Also notify the carrier. Retain the shipping carton
and packing material for inspection by the carrier. After inspection, we will make
arrangements to repair or replace the unit.

GMB-945GC User Manual viii

ix GMB-945GC User Manual
Contents
Chapter 1 General Information ............................1
1.1 Introduction ...............................................................................................2
1.2 Features....................................................................................................2
1.3 Specifications............................................................................................3
1.3.1 System..........................................................................................3
1.3.2 Memory.........................................................................................3
1.3.3 Input/Output..................................................................................3
1.3.4 Graphics........................................................................................3
1.3.5 Ethernet LAN ................................................................................3
1.3.6 Industrial features .........................................................................3
1.3.7 Mechanical and environmental specifications...............................3
1.4 Jumpers and Connectors..........................................................................4
Table 1.1: Jumpers......................................................................4
Table 1.2: Connectors.................................................................4
1.5 Board layout: Jumper and Connector Locations.......................................5
1.6 GMB-945GC Block Diagram.....................................................................6
Figure 1.1 GMB-945GC Block Diagram ......................................6
1.7 Safety Precautions....................................................................................7
1.8 Jumper Settings ........................................................................................8
1.8.1 How to set jumpers.......................................................................8
1.8.2 CMOS clear (CMOS1)..................................................................8
Table 1.3: CMOS1.......................................................................8
1.9 System Memory ........................................................................................8
1.10 Memory Installation Procedures................................................................9
1.11 Cache Memory..........................................................................................9
1.12 Processor Installation................................................................................9
Chapter 2 Connecting Peripherals ....................11
2.1 Introduction .............................................................................................12
2.2 USB and LAN Ports (LAN1_USB12/LAN2_USB34/USB56/USB7) ........12
Table 2.1: LAN LED Indicator....................................................12
2.3 VGA Connector (VGA1)..........................................................................13
2.4 Serial Ports (COM1~COM4) ...................................................................14
2.5 PS/2 Keyboard and Mouse Connector (KBMS1)....................................15
2.6 CPU Fan Connector (CPU_FAN1)..........................................................16
2.7 System FAN Connector (CHA_FAN1) ....................................................17
2.8 Front Panel Connectors (JFP2_1) ..........................................................18
2.8.1 Power/Sleep Waiting LED (JFP2_1)...........................................18
Table 2.2: ATX power supply LED status (No support for AT pow-
er).............................................................................18
2.8.2 Reset Connector (JFP2_1 pins 5 & 7)........................................19
2.8.3 HDD LED Connector (JFP2_1 pins 1 & 3)..................................19
2.8.4 ATX Soft Power Switch (JFP2_1 pins 6 & 8)..............................19
2.9 Line In, Line Out, Mic In Connector (AUDIO1)........................................19
2.10 Serial ATA Interface (SATA1, SATA2)....................................................20
2.11 PCIe x 16 slot (PCIE X 16)......................................................................21
2.12 Auxiliary 4-pin power connector (ATX12V1) ...........................................22
2.13 SPI Flash connector(SPI_CN1) ..............................................................23
Chapter 3 BIOS Operation..................................25
3.1 Introduction .............................................................................................26

GMB-945GC User Manual x
3.2 BIOS Setup............................................................................................. 26
3.2.1 Main Menu.................................................................................. 27
3.2.2 Standard CMOS Features.......................................................... 28
3.2.3 Advanced BIOS Features........................................................... 29
3.2.4 Advanced Chipset Features ....................................................... 30
3.2.5 Integrated Peripherals ................................................................ 32
3.2.6 Security Chip Configuration........................................................ 34
3.2.7 TPM Support............................................................................... 34
3.2.8 Power Management Setup......................................................... 35
3.2.9 PnP/PCI Configurations.............................................................. 37
3.2.10 PC Health Status........................................................................ 38
3.2.11 Frequency/Voltage Control......................................................... 38
3.2.12 Load Setup Defaults................................................................... 39
3.2.13 Set Password.............................................................................. 39
3.2.14 Save & Exit Setup....................................................................... 41
3.2.15 Quit without Saving..................................................................... 41
Chapter 4 Chipset Software Installation Utility 43
4.1 Before you begin..................................................................................... 44
4.2 Introduction............................................................................................. 44
4.3 Windows XP Driver Setup....................................................................... 45
Chapter 5 VGA Setup.........................................47
5.1 Introduction............................................................................................. 48
5.2 Windows Vista/XP/2000.......................................................................... 48
Chapter 6 LAN Configuration............................49
6.1 Introduction............................................................................................. 50
6.2 Features.................................................................................................. 50
6.3 Installation............................................................................................... 50
6.4 Win XP/Vista Driver Setup (Realtek RTL8111C).................................... 50
Appendix A Programming the Watchdog Timer.51
A.1 Programming the Watchdog Timer......................................................... 52
A.1.1 Watchdog timer overview ........................................................... 52
A.1.2 Programming the Watchdog Timer............................................. 52
Table A.1: Watchdog Timer Registers....................................... 54
A.1.3 Example Program....................................................................... 55
Appendix B I/O Pin Assignments.........................59
B.1 USB Header (USB56/USB7)................................................................... 60
Table B.1: USB Header (USB56) .............................................. 60
Table B.2: USB Header (USB7) ................................................ 60
B.2 VGA Connector (VGA1).......................................................................... 60
Table B.3: VGA Connector (VGA1) ........................................... 60
B.3 RS-232 Interface (COM1 and COM2)..................................................... 61
Table B.4: RS-232 Interface (COM1 and COM2)...................... 61
B.4 RS-232 Interface (COM3 and COM4)..................................................... 61
Table B.5: RS-232 Interface (COM3 and COM4)...................... 61
B.5 SPI_CN1: SPI fresh card pin connector.................................................. 62
Table B.6: SPI_CN1:SPI fresh card pin connector.................... 62

xi GMB-945GC User Manual
B.6 PS/2 Keyboard and Mouse Connector (KBMS1)....................................62
Table B.7: PS/2 Keyboard and Mouse Connector (KBMS1) .....62
B.7 CPU Fan Power Connector (CPU_FAN1) ..............................................63
Table B.8: CPU Fan Power Connector (CPU_FAN1)................63
B.8 System Fan Power Connector (CHA_FAN1)..........................................63
Table B.9: System Fan Power Connector (SYSFAN1/SYSFAN2)
..................................................................................63
B.9 Front Panel Connectors (JFP2_1) ..........................................................63
B.9.1 Power/Sleep LED (JFP2_1)........................................................64
Table B.10:Power/Sleep LED (JFP2_1) .....................................64
B.9.2 Reset Connector (JFP2_1).........................................................64
Table B.11:Reset Connector (JFP2_1).......................................64
B.9.3 HDD LED Connector (JFP2_1)...................................................64
Table B.12:HDD LED Connector (JFP2_1) ................................64
B.9.4 ATX Soft Power Switch (JFP2_1)...............................................64
Table B.13:ATX Soft Power Switch (JFP2_1).............................64
B.10 ATX1 12 V Auxiliary Power Connector (ATX12V1).................................65
Table B.14:ATX1 12 V Auxiliary Power Connector (ATX12V1)..65
B.11 ATX Power Connector (EXTPWR1)........................................................65
Table B.15:ATX Power Connector (EXTPWR1).........................65
B.12 USB/LAN ports (LAN1_USB12/LAN2_USB34).......................................65
Table B.16:USB Port...................................................................65
Table B.17:Ethernet 10/100Base-T RJ-45 Port ..........................66
B.13 Line In, Line Out, Mic In Connector (AUDIO1)........................................66
B.14 Serial ATA0 (SATA1)..............................................................................66
Table B.18:Serial ATA0 (SATA1)................................................66
B.15 Serial ATA1 (SATA2)..............................................................................66
Table B.19:Serial ATA1 (SATA2)................................................66
B.16 AT/ATX Mode (PSON1)..........................................................................67
Table B.20:AT/ATX Mode (PSON1) ...........................................67
B.17 System I/O Ports.....................................................................................67
Table B.21:System I/O Ports ......................................................67
B.18 DMA Channel Assignments ....................................................................68
Table B.22:DMA Channel Assignments......................................68
B.19 Interrupt Assignments .............................................................................68
Table B.23:Interrupt Assignments...............................................68
B.20 1st MB Memory Map...............................................................................69
Table B.24:1st MB Memory Map ................................................69

GMB-945GC User Manual xii

Chapter 1
1General Information

GMB-945GC User Manual 2
1.1 Introduction
The GMB-945GC is designed with the Inte®945GC and the ICH7 for industrial appli-
cations that require both performance computing and enhanced power management
capabilities. The motherboard supports Intel Pentium LGA 775 CoreTM 2 Duo up to
1.8 GHz / Pentium dual-core up to 1.8 Ghz / Pentium 4 up to 3.8 Ghz/ Celeron®D up
to 2.0 Ghz with 533/800 MHz front side bus and DDR2 533/667 MHz up to 2 GB.
The GMB-945GC offers cost-saving integrated graphics, built on the Intel® 945GC
chipset and features the unique Intel®Extreme Graphics architecture that maximizes
VGA performance and shares system memory up to 224 MB.
Advantech GMB-945GC is designed with Intel 945GC chipset and supports Intel
Core 2 Duo processor up to FSB 800 MHz. A rich I/O connectivity of 4 serial ports, 6
USB 2.0, dual GbE LAN and 2 SATA ports.
1.2 Features
Cost effective 945GC chipset: support 533/800 Front side bus
Rich I/O connectivity: 4 serial ports, 6 USB 2.0, dual GbE LAN
Standard Mini ITX form factor with industrial feature: The GMB-945GC is the
most fully-featured Mini ITX motherboard with balanced expandability and the
performance
Wide selection of storage devices: SATA HDD, customers benefit the flexibil-
ity of using the most suitable storage device for large capacity
Optimized integrated graphic solution: With Intel®Graphics Media Accelera-
tor 950, it supports versatile display options and 32-bit 3D graphics engine.

3 GMB-945GC User Manual
Chapter 1 General Information
1.3 Specifications
1.3.1 System
CPU: LGA 775 CoreTM 2 Duo up to 1.8 Ghz / Pentium dual-core up to 2.8 Ghz /
Pentium 4 up to 3.8 Ghz / Celeron®D up to 2.0 Ghz
BIOS: Award SPI 16 Mbit BIOS
System chipset: Intel 945GC with ICH7
SATA hard disk drive interface: Two on-board SATA connectors with data
transmission rate up to 300 MB/s
1.3.2 Memory
RAM: Up to 2 GB in 2 slots 200-pin SODIMM sockets. Supports dualchannel
DDRII 533/667 SDRAM
1.3.3 Input/Output
PCIe bus: 1PCIe x 16 slot
Enhanced parallel port: Configured to LPT1, LPT2, with 25 pin box header.
Supports EPP/SPP/ECP
Serial ports: Four serial ports, one of RS-232/422/485 and three of RS-232
serial ports
Keyboard and PS/2 mouse connector: Two 6-pin mini-DIN connectors are
located on the mounting bracket for easy connection to a PS/2 keyboard and
mouse
USB port: Supports up to six USB 2.0 ports with transmission rate up to 480
Mbps, 2 on board pin header and 4 external ports)
1.3.4 Graphics
Controller: Chipset integrated VGA controller
Display memory: Dynamically shared system memory up to 224 MB
CRT: Up to 2048 x 1536 resolution, 400 MHz RAMDAC
1.3.5 Ethernet LAN
Supporting single/dual 10/100/1000Base-T Ethernet port (s) via PCI Express x1
bus which provides 500 MB/s data transmission rate
Controller: LAN: Realtek RTL8111C
1.3.6 Industrial features
Watchdog timer: Can generate a system reset. The watchdog timer is pro-
grammable, with each unit equal to one second or one minute (255 levels)
1.3.7 Mechanical and environmental specifications
Operating temperature: 0 ~ 60° C (32 ~ 140° F, Depending on CPU)
Storage temperature: -20 ~ 70° C (-4 ~ 158° F)
Humidity: 5 ~ 95% non-condensing
Power supply voltage: +3.3 V, +5 V, +12 V, -12 V, 5 Vsb

GMB-945GC User Manual 4
Power consumption:
+5 V @ 4 A, +3.3 V @ 1.02 A, +12 V @ 2.35 A, 5 Vsb @ 0.26 A, -12 V @ 0.12
A (Maximum current values measured under stressful loading test, which CPU,
RAM, and Graphics are performed at top speed and full loading.)
Board size: 170 mm x 170 mm (6.69" x 6.69")
Board weight: 0.365 kg
1.4 Jumpers and Connectors
Connectors on the GMB-945GC motherboard link it to external devices such as hard
disk drives and a keyboard. In addition, the board has a number of jumpers used to
configure your system for your application.
The tables below list the function of each of the board jumpers and connectors. Later
sections in this chapter give instructions on setting jumpers. Chapter 2 gives instruc-
tions for connecting external devices to your motherboard.
Table 1.1: Jumpers
Label Function
CMOS1 CMOS clear
PSON1 AT/ATX mode selector
Table 1.2: Connectors
Label Function
JFP2_1
Reset connector
HDD LED connector
ATX soft power switch (PS_ON)
Power/Sleep waiting LED
USB56 USB port 5, 6 (on board)
USB7 USB port 7 (on board)
VGA1 VGA connector
COM1/COM2 Serial port: COM1/COM2 (rear panel port)
COM3/COM4 Serial port: COM3/COM4 (9-pin connector)
KBMS1 PS/2 keyboard and Mouse connector
Cable length: 20 meter
CPU_FAN1 CPU FAN connector
CHA_FAN1 System FAN connector 1
LAN1_USB12 LAN1 / USB port 1,2
LAN2_USB34 LAN2 / USB port 3,4
SATA1 Serial ATA0
SATA2 Serial ATA1
ATX12V1 ATX 12 V Auxiliary power connector
EXTPWR1 ATX power connector
SPI_CN1 SPI flash card pin header

5 GMB-945GC User Manual
Chapter 1 General Information
1.5 Board layout: Jumper and Connector Locations
Audio1
LAN1_USB12
LAN2_USB34
VGA1 COM12
ATX12V1
KBMS1
SATA1
SATA2
USB56
CPU_FAN1
CHA_FAN1
PCIeX16
CMOS1
PSON1
USB7
EXTPWR1 SPI_CN1 DIMM1
COM4
COM3
JFP2_1

GMB-945GC User Manual 6
1.6 GMB-945GC Block Diagram
Figure 1.1 GMB-945GC Block Diagram

7 GMB-945GC User Manual
Chapter 1 General Information
1.7 Safety Precautions
Warning! Always completely disconnect the power cord from your chassis when-
ever you work with the hardware. Do not make connections while the
power is on. Sensitive electronic components can be damaged by sud-
den power surges. Only experienced electronics personnel should open
the PC chassis.
Caution! Always ground yourself to remove any static charge before touching the
motherboard. Modern electronic devices are very sensitive to static
electric charges. As a safety precaution, use a grounding wrist strap at
all times. Place all electronic components on a static-dissipative surface
or in a static-shielded bag when they are not in the chassis.
Caution! The computer is provided with a battery-powered Real-time Clock cir-
cuit. There is a danger of explosion if battery is incorrectly replaced.
Replace only with same or equivalent type recommended by the manu-
facturer. Discard used batteries according to manufacturer's instruc-
tions.
Caution! There is a danger of a new battery exploding if it is incorrectly installed.
Do not attempt to recharge, force open, or heat the battery. Replace the
battery only with the same or equivalent type recommended by the man-
ufacturer. Discard used batteries according to the manufacturer’s
instructions.

GMB-945GC User Manual 8
1.8 Jumper Settings
This section provides instructions on how to configure your motherboard by setting
the jumpers. It also includes the motherboards's default settings and your options for
each jumper.
1.8.1 How to set jumpers
You can configure your motherboard to match the needs of your application by set-
ting the jumpers. A jumper is a metal bridge that closes an electrical circuit. It consists
of two metal pins and a small metal clip (often protected by a plastic cover) that slides
over the pins to connect them. To “close” (or turn ON) a jumper, you connect the pins
with the clip. To “open” (or turn OFF) a jumper, you remove the clip. Sometimes a
jumper consists of a set of three pins, labeled 1, 2, and 3. In this case you connect
either pins 1 and 2, or 2 and 3. A pair of needle-nose pliers may be useful when set-
ting jumpers.
1.8.2 CMOS clear (CMOS1)
The GMB-945GC motherboard contains a jumper that can erase CMOS data and
reset the system BIOS information. Normally this jumper should be set with pins 1-2
closed. If you want to reset the CMOS data, set J1 to 2-3 closed for just a few sec-
onds, and then move the jumper back to 1-2 closed. This procedure will reset the
CMOS to its default setting.
* Default
1.9 System Memory
The GMB-945GC has two sockets for 200-pin SODIMMx2.
All these sockets use 1.8 V unbuffered double data rate synchronous DRAMs (DDR
SDRAM). They are available in capacities of 256, 512 and 1024 MB. The sockets can
be filled in any combination with DIMMs of any size, giving a total memory size
between 256 MB and 2 GB. GMB-945GC does NOT support ECC (error correcting
code).
Table 1.3: CMOS1
Function Jumper Setting
*Keep CMOS data
Clear CMOS data
1-2 closed
2-3 closed
1
1