AMI MB941 User manual

MB941

LGA775 Core 2 Duo

Intel

®

G41 Chipset

Micro-ATX Motherboard

USER’S MANUAL

Version 1.0

Acknowledgments

AMI is a registered trademark of American Megatrends, Inc.

PS/2 is a trademark of International Business Machines

Corporation.

Intel is a trademark or registered trademark of Intel Corporation.

Microsoft Windows is a registered trademark of Microsoft

Corporation.

Winbond is a registered trademark of Winbond Electronics

Corporation.

All other product names or trademarks are properties of their

respective owners.

MB941 User’s Manual iii

Table of Contents

Introduction ...................................................... 1

Checklist ............................................................................. 1

Product Description ............................................................ 2

Specifications ..................................................................... 3

Board Dimensions .............................................................. 4

Installations ...................................................... 5

Installing the CPU .............................................................. 6

ATX Power Installation ...................................................... 6

Installing the Memory......................................................... 7

Setting the Jumpers............................................................. 8

Connectors on MB941 ..................................................... 11

BIOS Setup.......................................................22

Drivers Installation ......................................44

Intel Chipset Software Installation Utility ......................... 45

Intel G41 Chipset Family Graphics Driver Installation ..... 48

Realtek High Definition Audio Driver Installation ........... 51

Realtek LAN Controller Drivers Installation .................... 53

Appendix ...........................................................55

A. I/O Port Address Map .................................................. 55

B. Interrupt Request Lines (IRQ) ...................................... 56

C. Watchdog Timer Configuration ................................... 57

D. Digital I/O Sample Code ............................................. 62

iv

MB941 User’s Manual

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INTRODUCTION

MB941 User’s Manual 1

Introduction

Checklist

Your MB941 Core 2 Duo motherboard package should include the items

listed below:

 The MB941 motherboard

 This User’s manual

 1x SATA cable (SATA-5)

 1x COM port cable (PK1-56)

 1x USB cable (USB2-9)

 1x DVD containing the following:

 Chipset Drivers

 Flash Memory Utility

Remarks: PK1-20B dual-port COM cable is optional.

INSTALLATIONS

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MB941 User’s Manual

Product Description

The MB941 Micro-ATX motherboard is designed for either the

Intel Core2 Duo or Core2 Quad processors of up to

1333MHz FSB. It is based on the Intel G41 Express chipset and it

comes with two dual-channel DDR3 memory slots and 8GB

memory capacity for faster system responsiveness and support of

64-bit computing.

Dual independent display comes to life with the onboard Intel

G41 integrated graphics with CRT. LAN functionality is supported

with two Gigabit Ethernet controllers.

MB941 is supports high-end features including high definition

audio, eight fast USB ports, four SATAII, watchdog timer, digital

I/O and four serial ports. Board dimensions are 244mm by

244mm.

MB941 FEATURES

 Supports Intel® Core™2 Quad / Core™2 Duo / Pentium®

Dual Core/ Celeron® processors

 800MHz/1066MHz/1333MHz FSB

 DDR3 DIMM x2, Max. 8GB

 Single Gigabit LAN

 Integrated G41 VGA for CRT

 8x USB 2.0, 4x SATA II, 4x COM

 HD audio, Watchdog timer, 2x PCI , 1x PCI-E x1,

1x PCI-E x16.

INTRODUCTION

MB941 User’s Manual 3

Specifications

Product

MB941

Form Factor

Micro-ATX

CPU Type

LGA775 socket for Intel® Core™2 Quad / Intel® Core™2 Duo / Celeron®

processors 800/1066/1333MHz FSB (45nm/65nm Technology)

Green /APM

APM1.2

BIOS

AMI BIOS, support ACPI Function

Chipset

Intel® G41 (82G41) Express GMCH: 1254 FCBGA (25W)

Intel® ICH7 (82801GB): 652 BGA (3.3W)

Memory Slot

240 DIMM x 2 (w/o ECC), for DDR3-1066 / DDR3-800 MHz Max. 4GB, dual

channel

VGA

Intel® G41 Integrated Graphics Controller (GMA X4500)

- Support DX10 and OpenGL2.1

- Dual independent display available through on-board VGA

- and DVI-D (via IBP192 on PCIe x16 slot) ~ optional

LAN

Realtek RTL8111E PCI-E Gigabit LAN Controller x 2

USB

ICH7 built-in USB 2.0 host controller, support 8 ports

- 4 ports on edge connectors

- 4 ports from pin headers

Serial ATA

Ports

ICH7 built-in SATA controller, supports 4 ports

- SATA II (3.0 Gb/s)

Compact

Flash Slot

ICH7 built-in one channel UDMA 33/66/100, for CF Type II (on component

side)

Audio

Intel ICH7 built-in 7.1CH HD audio controller w/ Realtek ALC888 Codec

- Edge connector (6 audio jacks)

LPC I/O

Winbond W83627UHG :

- COM1 (RS232/422/485), COM2 (RS232)

- COM3 (RS232), COM4 (RS232)

[with pin-9 with power for 4 ports (500 mA for each port)]

- CPU fan connector supports 4-wire fan with PWM control

- System fan connector x1 DC fan control

- System fan connector x1 w/o control

- Supports two thermal sensor (CPU + on-board)

- Voltage monitoring for VCC (processor), 3.3V, 5V, and 12V

- Hardware monitor (2 thermal inputs, 4 voltage monitor inputs, VID0-4 & 1 x

fan header)

Digital IO

4 in & 4 out

Expansion

Slots

PCI-express (16x) slot x 1

PCI-Express(1x) slot x1

PCI slot x 2

IBASE

Proprietary

LPC Port

2 x 8 pins header x 1 for optional features:

- ID395-R for TPM 1.2 ~ Optional (Custom BIOS needed to support this

function)

- ID394-R for 4 additional serial Ports ~ Optional (Custom BIOS needed to

support this function)

Edge

Connector

PS/2 KB/MS, COM1, CRT, LPT, HD audio

RJ45 + dual USB stack connector x 2 for LAN1~2 & USB1~4

On Board

Header/

Connector

Standard SATA (7-pin shrouded vertical) connector x4

2x5-pin header x2 for USB 5~8, 2x5-pin DF11 x1 for COM2 (RS232)

2x10-pin DF11 x1 for COM3~4 (RS232), 2x5-pin header x1 for Digital I/O

4-pins header x1 for CPU fan & 3-pim headers x2 for system fan

2x8-pin box header for power switch/power LED/HDD LED/reset switch

Watchdog Timer

Yes (256 segments, 0, 1, 2…255 sec/min)

Power

Connector

ATX1 (24-pin connector for system)

ATX_12 (8-pin connector for CPU operating voltage)

Board Size

244mm x 244mm

INSTALLATIONS

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MB941 User’s Manual

Board Dimensions

INSTALLATIONS

MB941 User’s Manual 5

Installations

This section provides information on how to use the jumpers and

connectors on the MB941 in order to set up a workable system. The

topics covered are:

Installing the CPU ................................................................................ 6

ATX Power Installation ....................................................................... 6

Installing the Memory .......................................................................... 7

Setting the Jumpers .............................................................................. 8

Connectors on MB941 ....................................................................... 11

INSTALLATIONS

6

MB941 User’s Manual

Installing the CPU

The MB941 motherboard supports an LGA 775 processor socket for

Intel® Core 2 Duo processors.

The LGA 775 processor socket comes with a lever to secure the

processor. Refer to the pictures below, from left to right, on how to place

the processor into the CPU socket. Please note that the cover of the

LGA775 socket must always be installed during transport to avoid

damage to the socket.

ATX Power Installation

The system power is provided to the motherboard with the ATX1 and

ATX2 power connectors. ATX1 is a 24-pin power connector and ATX2

is a 8-pin 12V power connector.

The 24-pin power connector can to be connected to a standard 20-pin

ATX power connector in a standard ATX power supply (Min. 400watt).

Note: The power supply 5VSB voltage must be at least 2A.

INSTALLATIONS

MB941 User’s Manual 7

Installing the Memory

The MB941 motherboard supports two DDR3 memory sockets for a

maximum total memory of 8GB. It supports DDR3 800/1066MHz.

Basically, the system memory interface has the following features:

Supports two 64-bit wide DDR data channels

Available bandwidth up to 6.4GB/s (DDR3 1066) for two-channel

mode.

Supports 512Mb, 1Gb, 2Gb DDR3 technologies.

Supports only x8, x16, DDR3 devices with four banks

Supports only unbuffered DIMMs

Supports opportunistic refresh

Up to 32 simultaneously open pages (four per row, four rows

maximum)

INSTALLATIONS

8

MB941 User’s Manual

Setting the Jumpers

Jumpers are used on the motherboard are used to select various settings

and features according to your needs and applications. Contact your

supplier if you have doubts about the best configuration for your needs.

The following lists the connectors and their respective functions.

Jumper Locations on MB941 ............................................................... 9

JP2, JP1, JP7, JP6: COM1/2/3/4 RS232 +5V/+12V Power Setting .... 10

JP3, JP4, JP5: RS232/422/485 (COM1) Selection.............................. 10

JP8: Clear CMOS Contents ............................................................... 10

INSTALLATIONS

MB941 User’s Manual 9

Jumper Locations on MB941

DDRⅢ 2

DDRⅢ 1

JP2, JP1, JP7, JP6: COM1/2/3/4 RS232 +5V/+12V Power Setting

JP3, JP4, JP5: RS232/422/485 (COM1) Selection

JP8: Clear CMOS Contents

INSTALLATIONS

10

MB941 User’s Manual

JP2, JP1, JP7, JP6: COM1/2/3/4 RS232 +5V/+12V Power

Setting

JP4/JP6

Setting

Function

Pin 1-2

Short/Closed

+12V

Pin 3-4

Short/Closed

Normal

Pin 5-6

Short/Closed

+5V

JP3, JP4, JP5: RS232/422/485 (COM1) Selection

COM1 is selectable for RS232, RS-422 and RS-485.

COM1

Function

RS-232

RS-422

RS-485

Jumper

Setting

(pin closed)

JP3:

1-2

JP4:

3-5 & 4-6

JP5:

3-5 & 4-6

JP3:

3-4

JP4:

1-3 & 2-4

JP5:

1-3 & 2-4

JP3:

5-6

JP4:

1-3 & 2-4

JP5:

1-3 & 2-4

JP8: Clear CMOS Contents

Use JP8, a 3-pin header, to clear the CMOS contents.

Note that the ATX-power connector should be disconnected from the

motherboard before clearing CMOS.

JP8

Setting

Function

Pin 1-2

Short/Closed

Normal

Pin 2-3

Short/Closed

Clear CMOS

INSTALLATIONS

MB941 User’s Manual 11

Connectors on MB941

The connectors on MB941 allow you to connect external devices such as

keyboard, floppy disk drives, hard disk drives, printers, etc. The following

table lists the connectors on MB941 and their respective functions.

ATX1: 24-pin ATX Power Connector ............................................... 13

ATX2: ATX 12V Power Connector................................................... 13

DDRIII1: Channel A DDR3 Socket ................................................... 13

DDRIII2: Channel B DDR3 Socket ................................................... 13

FAN2: CPU Fan Power Connector .................................................... 13

FAN1: System Fan1 Power Connector ............................................... 13

FAN3: System Fan2 Power Connector ............................................... 15

CN1: PS/2 Keyboard and PS/2 Mouse Connectors............................. 15

CN2: COM1 RS232/RS422/RS485 Connector .................................. 15

CN3: Parallel Port Connector............................................................. 16

CN4: VGA CRT Connector ............................................................... 16

CN5: Audio Connector ...................................................................... 17

CN6: Gigabit RJ-45 &USB 0/1 Connector ......................................... 17

CN7: Gigabit RJ-45 &USB 2/3 Connector ......................................... 17

CN8, CN9, CN10, CN11: SATA HDD Connectors ........................... 17

J1: COM2/RS232 Serial Port ............................................................. 17

J2: For LPC I/F Adaptor Card ........................................................... 17

J3: Digital I/O Connector (4 in, 4 out)................................................ 18

J4: COM3, COM4 Serial Port (DF11 Connector) .............................. 18

J5: Compact Flash Socket .................................................................. 18

J6: Audio CD-In Connector ............................................................... 18

J7: Audio Front Header ..................................................................... 19

J8: System Function Connector .......................................................... 19

J9: USB4/USB5 Connector ............................................................... 21

J10: USB6/USB7 Connector.............................................................. 21

J11: SPI Debug Tools Port (Factory use only) .......................................... 21

PCI1, PCI2: PCI Slot ......................................................................... 21

PCIE1: x16 PCI Express Slot ............................................................ 21

PCIE2: x1 PCI Express Slot .............................................................. 21

INSTALLATIONS

12

MB941 User’s Manual

Connector Locations on MB941

DDRⅢ 2

DDRⅢ 1

ATX1: 24-pin ATX Power Connector

ATX2: ATX 12V Power Connector

DDRIII1: Channel A DDR3 Socket

DDRIII2: Channel B DDR3 Socket

FAN2: CPU Fan Power Connector

FAN1: System Fan1 Power Connector

FAN3: System Fan2 Power Connector

CN1: PS/2 Keyboard and PS/2 Mouse

Connectors

CN2: Serial Ports(COM1)

CN3: Parallel Port Connector

CN4: VGA CRT Connector

CN5: Audio Connector

CN6: GbE RJ-45 and USB0/1 Connector

CN7: GbE RJ-45 and USB2/3 Connector

CN11, CN9, CN10, CN8: SATA0/1/2/3

Connector

J1: COM2/RS232 Serial Port (DF11

Connector)

J2: For LPC I/F Adaptor Card

J3: Digital I/O Connector (4 in, 4 out)

J4: COM3, COM4 Serial Port (DF11

Connector)

J5: Compact Flash Connector

J6: Audio CD-IN Header

J7: Audio Front Header

J8: System Function Connector

J9, J10: USB 4/5/6/7 Connector

J11: SPI Debug Tools Port (Factory use only)

PCI1, PCI2: PCI Slot

PCIE1: x16 PCI Express Slot

PCIE2: x1 PCI Express Slot

INSTALLATIONS

MB941 User’s Manual 13

ATX1: 24-pin ATX Power Connector

Signal Name

Pin #

Signal Name

3.3V

13

1

3.3V

-12V

14

2

3.3V

Ground

15

3

Ground

PS-ON

16

4

+5V

Ground

17

5

Ground

18

6

+5V

Ground

19

7

Ground

-5V

20

8

Power good

+5V

21

9

5VSB

+5V

22

10

+12V

+5V

23

11

+12V

Ground

24

12

+3.3V

ATX2: ATX 12V Power Connector

This connector supplies the CPU operating voltage.

Signal Name

Pin #

Signal Name

+12V

5

1

Ground

+12V

6

2

Ground

+12V

7

3

Ground

+12V

8

4

Ground

DDRIII1: Channel A DDR3 Socket

DDRIII2: Channel B DDR3 Socket

FAN2: CPU Fan Power Connector

Pin #

Signal Name

1

Ground

2

+12V

3

Rotation detection

4

Control

FAN1: System Fan1 Power Connector

Pin #

Signal Name

1

Ground

2

+12V

INSTALLATIONS

14

MB941 User’s Manual

3

Rotation detection

INSTALLATIONS

MB941 User’s Manual 15

FAN3: System Fan2 Power Connector

CN1: PS/2 Keyboard and PS/2 Mouse Connectors

Mouse (top)

Keyboard (bottom)

Keyboard

Signal

Pin #

Mouse

Signal

Keyboard data

1

Mouse data

N.C.

2

N.C.

GND

3

GND

5V

4

5V

Keyboard clock

5

Mouse clock

N.C.

6

N.C.

CN2: COM1 RS232/RS422/RS485 Connector

[

Pin #

Signal Name

RS-232

R2-422

RS-485

1

DCD

TX-

DATA-

2

RX

TX+

DATA+

3

TX

RX+

NC

4

DTR

RX-

NC

5

Ground

6

DSR

NC

7

RTS

NC

8

CTS

NC

9

RI

NC

10

NC

Pin #

Signal Name

1

Ground

2

+12V

3

NC

INSTALLATIONS

16

MB941 User’s Manual

CN3: Parallel Port Connector

CN3 is a DB-25 external connector on top of the VGA and serial ports.

CN3 Parallel Port

Signal Name

Pin #

Signal Name

Line printer strobe

1

14

AutoFeed

PD0, parallel data 0

2

15

Error

PD1, parallel data 1

3

16

Initialize

PD2, parallel data 2

4

17

Slin

PD3, parallel data 3

5

18

Ground

PD4, parallel data 4

6

19

Ground

PD5, parallel data 5

7

20

Ground

PD6, parallel data 6

8

21

Ground

PD7, parallel data 7

9

22

Ground

ACK, acknowledge

10

23

Ground

Busy

11

24

Ground

Paper empty

12

25

Ground

Select

13

N/A

CN4: VGA CRT Connector

CN4 is a DB-15 VGA connector. The following table shows the pin-out

assignments of this connector.

Signal Name

Pin #

Signal Name

Red

1

2

Green

Blue

3

4

N.C.

GND

5

6

GND

7

8

GND

VCC

9

10

GND

N.C.

11

12

DDCDATA

HSYNC

13

14

VSYNC

DDCCLK

15

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AMI MB941 User manual

AMI MB941 User manual

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