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
2 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 systemresponsiveness 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
240DIMMx2(w/oECC), for DDR3-1066/DDR3-800MHzMax. 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-wirefan 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-Rfor4additionalserial Ports ~ Optional (Custom BIOSneeded 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
4 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.