VIA Technologies NAB-7400 User manual

User’s Manual
NAB-7400
Version 1.11
April 2, 2007

Copyright
Copyright © 2006-2007 VIA Technologies Incorporated. All rights reserved.
No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any language, in any form or by any means, electronic, mechanical,
magnetic, optical, chemical, manual or otherwise without the prior written permission of VIA
Technologies, Incorporated.
Trademarks
All trademarks are the property of their respective holders. PS/2 is a registered trademark of
IBM Corporation. Award BIOS is a registered trademark of Phoenix Technologies Ltd.
Macrovision
Apparatus Claims of U.S. Patent Nos. 4,631,603; 4,819,098; 4,907,093; 5,315,448; 6,516,132
licensed for limited viewing uses only. This product incorporates copyright protection
technology that is protected by certain U.S. patents and other intellectual property rights owned
by Macrovision and other rights owners. Use of this copyright protection technology must be
authorized by Macrovision, and is intended for home and other limited viewing uses only
unless otherwise authorized by Macrovision. Reverse engineering or disassembly is
prohibited.
Disclaimer
No license is granted, implied or otherwise, under any patent or patent rights of VIA
Technologies. VIA Technologies makes no warranties, implied or otherwise, in regard to this
document and to the products described in this document. The information provided in this
document is believed to be accurate and reliable as of the publication date of this document.
However, VIA Technologies assumes no responsibility for the use or misuse of the information
in this document and for any patent infringements that may arise from the use of this
document. The information and product specifications within this document are subject to
change at any time, without notice and without obligation to notify any person of such change.

FCC-B Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits for a class B digital
device, pursuant to part 15 of the FCC rules. These limits are designed to provide 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. Operation of this equipment in a residential area is likely to cause
harmful interference, in which case the user will be required to correct the interference at his
personal expense.
Notice 1
The changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
Notice 2
Shielded interface cables and A.C. power cord, if any, must be used in order to comply with
the emission limits.
Tested To Comply
With FCC Standards
FOR HOME OR OFFICE USE

Safety Instructions
1. Always read the safety instructions carefully.
2. Keep this User's Manual for future reference.
3. Keep this equipment away from humidity.
4. Lay this equipment on a reliable flat surface before setting it up.
5. The openings on the enclosure are for air convection hence protects the equipment from
overheating. DO NOT COVER THE OPENINGS.
6. Make sure the voltage of the power source and adjust properly 110/220V before
connecting the equipment to the power inlet.
7. Place the power cord in such a way that people cannot step on it. Do not place anything
over the power cord.
8. Always unplug the power cord before inserting any add-on card or module.
9. All cautions and warnings on the equipment should be noted.
10. Never pour any liquid into the opening. Liquid can cause damage or electrical shock.
11. If any of the following situations arises, get the equipment checked by a service personnel:
•The power cord or plug is damaged
•Liquid has penetrated into the equipment
•The equipment has been exposed to moisture
•The equipment has not work well or you cannot get it work according to User's
Manual.
•The equipment has dropped and damaged
•If the equipment has obvious sign of breakage
12. DO NOT LEAVE THIS EQUIPMENT IN AN ENVIRONMENT UNCONDITIONED,
STORAGE TEMPERATURE ABOVE 60 C (140F), IT MAY DAMAGE THE
EQUIPMENT.
CAUTION: Explosion or serious damage may occur if the battery is
incorrectly replaced. Replace only with the same or equivalent
battery type recommended by the manufacturer.

i
TABLE OF CONTENTS
Table of Contents .................................................................. i
Chapter 1 ............................................................................ 1
Specifications .................................................................... 1
Mainboard Specifications..................................................... 2
Mainboard Layout............................................................... 4
Back Panel Layout.............................................................. 5
Chapter 2 ............................................................................ 6
Installation........................................................................ 6
CPU ................................................................................. 7
Memory Module Installation................................................. 9
Connecting the Power Supply..............................................10
Back Panel Ports ...............................................................11
Connectors.......................................................................12
Jumpers...........................................................................18
Slots ...............................................................................20
Chapter 3 ...........................................................................21
BIOS Setup ......................................................................21
Entering Setup..................................................................22
Control Keys.....................................................................23
Navigating the BIOS Menus ................................................24
Getting Help.....................................................................25
Main Menu .......................................................................26
Standard CMOS Features....................................................28
IDE Drives .......................................................................29
Advanced BIOS Features ....................................................30
CPU Feature.....................................................................33
Hard Disk Boot Priority.......................................................35
Advanced Chipset Features.................................................36
AGP & P2P Bridge Control...................................................38
CPU & PCI Bus Control.......................................................40
Integrated Peripherals .......................................................41
Power Management Setup ..................................................44
Peripheral Activities...........................................................46
IRQs Activities..................................................................48

ii
PNP/PCI Configurations......................................................49
Frequency / Voltage Control ...............................................51
Load Fail-Safe Defaults ......................................................53
Load Optimized Defaults.....................................................54
Set Supervisor / User Password...........................................55
Save & Exit Setup .............................................................57
Exit Without Saving...........................................................58
Chapter 4 ...........................................................................59
Driver Installation .............................................................59
Driver Utilities ..................................................................60
CD Content ......................................................................62
Appendix ............................................................................63
Watchdog Timer Configuration ............................................63
Sample Code ....................................................................64

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1
CHAPTER 1
Specifications
The ultra-compact and highly integrated VIA NAB-7400 uses the
mainboard form-factor developed by VIA Technologies, Inc. as
part of the company’s open industry-wide Total Connectivity
initiative. The mainboard enables the creation of an exciting new
generation of small, ergonomic, innovative and affordable
systems. Through a high level of integration, it occupies 66% of
the size of FlexATX mainboard form factor.

Chapter 1
2
MAINBOARD SPECIFICATIONS
CPU
•Support VIA C7 1.0GHz NanoBGA2 Processor
Chipset
•VIA CN700 North Bridge
•VIA VT8237R-Series South Bridge
Graphics
•Integrated UniChrome™ Pro 3D/2D AGP with MPEG-2 Video
Decoding Acceleration
Memory
•1 x DDR2 533/400 DIMM slot (up to 1 GB)
Expansion Interface
•2 x Mini PCI Interface
•1 x 32-bit PCI Golden Finger
IDE
•2 x UltraDMA 133/100/66 connectors (1 x 40 pins and 1 x 44
pins)
LAN
•4 x Intel 82551ER Fast Ethernet PCI Controller or 4 x Intel
82541GI of Gigabit Ethernet Controllers
Back Panel I/O Ports
•1 x COM port
•2 x USB 2.0 ports
•4 x RJ-45 LAN ports

Specifications
3
Onboard I/O Connectors
•1 x VGA pin connector
•1 x Digital I/O pin connector
•1 x PS/2 pin connector for keyboard and mouse
•1 x PCI pin header for storage module board
•1 x PCI extension pin connector (for BXB board)
•1 x Front panel pin connector
•1 x Front panel LED pin connector for the LAN activity indicators
of Ethernet and wireless
•2 x Fan pin connectors (CPU Fan and System Fan)
•2 x SATA connectors
•3 x USB pin connectors for 6 additional USB 2.0 ports (1 port
for VNT wireless board)
•3 x Serial port pin connectors for COM2/3/4
•1 x ATX Power connector
•1 x Buzzer
BIOS
•Award BIOS with LPC 4/8Mbit flash memory capacity
Form Factor
•6-layer PCB
•17cm X 17.8cm

Chapter 1
4
MAINBOARD LAYOUT

Specifications
5
BACK PANEL LAYOUT

6
CHAPTER 2
Installation
This chapter provides you with information about hardware
installation procedures. It is recommended to use a grounded wrist
strap before handling computer components. Electrostatic discharge
(ESD) can damage some components.

Installation
7
CPU
The VIA NAB-7400 mainboard can support VIA C7 NanoBGA2 Processor.

Chapter 2
8
CPU Fan and System Fan: CPUFAN and SYSFAN
The CPUFAN (CPU fan) and SYSFAN (system fan) run on +12V and maintain
system cooling. When connecting the wire to the connectors, always be
aware that the red wire is the Positive and should be connected to the +12V.
The black wire is Ground and should always be connected to GND.
FAN_MCM is a switch that is used by high-quality fans to monitor the system
temperature and will automatically adjust according to the environment.
CPUFAN
Pin Signal
1 FAN_MCM
2 +12V
3 GND
SYSFAN
Pin Signal
1 FAN Speed detect
2 FAN_Control
3 GND
1
SYSFAN
1
CPUFAN

Installation
9
MEMORY MODULE INSTALLATION
The VIA NAB-7400 mainboard provides one 240-pin DIMM slot for DDR2
400/533 SDRAM memory modules and supports the memory size up to 1GB.
DDR2 SDRAM Module Installation Procedures
•Locate the DIMM slot in the motherboard.
•Unlock a DIMM slot by pressing the retaining clips outward.
•Align a DIMM on the socket such that the notch on the DIMM
matches the break on the slot.
•Firmly insert the DIMM into the slot until the retaining clips snap
back in place and the DIMM is properly seated.
Available DDR2 SDRAM Configurations
Refer to the table below for available DDR2 SDRAM configurations on the
mainboard.
Slot Module Size Total
DIMM 64MB, 128MB, 256MB, 512MB, 1GB 64MB-1GB
Maximum supported system memory 64MB-1GB
DIMM

Chapter 2
10
CONNECTING THE POWER SUPPLY
The VIA NAB-7400 mainboard supports a conventional ATX power supply for
the power system. Before inserting the power supply connector, always
make sure that all components are installed correctly to ensure that no
damage will be caused.
ATX 20-Pin Power Connector
To connect the ATX power supply, make sure the power plug is inserted in
the proper orientation and the pins are aligned. Then push down the plug
firmly into the connector.
Pin Signal
1 +3.3V
2 +3.3V
3 GND
4 +5V
5 GND
6 +5V
7 GND
8 Power Good
9 +5V Standby
10 +12V
11 +3.3V
12 -12V
13 GND
14 Power Supply On
15 GND
16 GND
17 GND
18 -5V
19 +5V
20 +5V
ATXPWR
1
10
11
20

Installation
11
BACK PANEL PORTS
The back panel has the following ports:
Serial port: COM 1
The 9-pin COM 1 port is for pointing devices or other
serial devices.
USB 2.0 ports
The USB ports is for connecting to external peripheral
devices.
RJ-45 10/100 LAN ports
The mainboard provides four standard RJ-45
ports which allow connection to a Local Area
Network (LAN).

Chapter 2
12
CONNECTORS
Hard Disk Connectors: IDE1 & IDE2
The mainboard has an Ultra DMA 133/100/66 controller. You can connect up
to four hard disk drives, CD-ROM and other devices.
The primary hard drive should always be connected to IDE1 as the master
drive. Both IDE drives can connect to a master and a slave drive.
1
IDE1 (40 pins)
IDE2 (44 pins)
1
If two drives are connected to a single cable, the jumper on the second drive
must be set to slave mode. Refer to the drive documentation supplied by the
vendor for the jumper settings.
IDE2 Pinout:
Pin Signal Pin Signal
1 -IDERST2 2 GND
3 SDD7 4 SDD8
5 SDD6 6 SDD9
7 SDD5 8 SDD10
9 SDD4 10 SDD11
11 SDD3 12 SDD12
13 SDD2 14 SDD13
15 SDD1 16 SDD14
17 SDD0 18 SDD15
19 GND 20 NC
21 SDDREQ 22 GND
23 -SDIOW 24 GND
25 -SDIOR 26 GND
27 SHDRDY 28 NC
29 -SDDACK 30 GND
31 IRQ15 32 NC
33 SDA1 34 S_ATA66
35 SDA0 36 SDA2
37 -SCS1 38 -SCS3
39 -HD_led2 40 GND
41 +5V 42 +5V
43 GND 44 NC