AOpen AX5T-OV User Manual

Chapter 1

Overview

The AX5T is a high-performancePentium-based system boardthatutilizes the
PCI/ISA architecture and ATX form factor. It integrates the Intel 82430TX
PCIset, an Ultra I/O controller, and a PCI mode 4 enhanced IDE controller with
bus master and Ultra DMA/33 to enhance system performance. It has 256KB or

512KB pipeline-burst second-level cache onboard and support four single in­line memory modules (SIMM) in addition two Dual in-line memory modules
(DIMM) that allow to mix EDO and SDRAM memory and expansion up to a

maximum of 256MB. AX5T uses 2M bit Flash ROM BIOS to reserve for future
new functions.

The other important features include:

Suspend To Hard Drive

"Immediately"turns on system and goes back to the originalscreen before power
down. You can resume your original work directly from hard disk without go
through the Win95 booting process and run your application again. Suspend to
Hard Drive saves your current work (system status, memory image) into hard
disk. Note that you have to use VESA compatible PCI VGA (AOpen S3 PCI
PV60/PT60), Sound Blaster compatible sound card with APM driver (AOpen
AW32/MP56), Rockwell compatible Modem (AOpen F56/MP56) for Suspend to
Hard Drive to work properly.

Internal Modem Card Wake-up

In conjunction with ATX soft power On/Off, it is possible to have system totally
power off and wakeup to automatically answer a phone call such as answering
machine or to send/receive fax. The most important break through is not only
external box modem but also internal modem card can be used to support
Modem Wake Up. The AX5T and MP56 internal modem card implement special
circuit (patent applied) to make sure the modem card work properly without any
power.

1-1

Overview

RTC Wake Up Timer

The Wake Up Timer is more like an alarm, which wakes up and power on your
system at a pre-defined time for specific application. It can be set to wake up
everyday or on specific date within a month. The date/time accurate is second.

High Efficient Synchronous Switching Regulator

Most of the current switching designs are Asynchronous mode, which from the
technical point of view, still consumes very high power as well as heat. AX5T
implements high efficient synchronous switching design that the temperature of
MOS FET is less than 36 degree C compared with 57 degree Schottky diode of
Asynchronous design.

3V Over Current Protection Circuit

The Over Current Protection was very popular implemented on the Baby AT or
ATX +5V/+12V switching power supply. But unfortunately, the new generation
CPU and chipset use 3.3V or 2.8V voltage that have regulator to transfer 5V to

3.3V/2.8V, and make 5V over current protection useless. AX5T with switching
regulator onboard support 3.3V (Vcpuio, chipset, PBSRAM, SDRAM) and 2.8V
(CPU Vcore) over current protection, in conjunction with 5V/12V power supply
provide the full line over current protection.

CPU Thermal Protection

When CPU temperature is higher than 55 degree C, the CPU speed will
automatically slow down and there will be warning from BIOS and also ADM
(Advanced Desktop Manager, similar as Intel LDCM), if ADM is installed.

CPU Fan Monitoring

AX5T implements a fan monitoring function to prevent CPU overheat. The
system will report and alarm CPU fan malfunction either though BIOS or utility
software such as ADM (Advanced Desktop Manager).

System Voltage Monitoring

Further more, AX5T implements a voltage monitoring system, As you turn on
your system, this smart design will continue to monitor your system working
voltage. If any of the system voltage is over the component's standard. There
will be alarm through speaker or ADM (Advanced Desktop Manager) for a
warning to user.

FCC DoC certificate

AX5T is the first few boards to pass FCC DoC test. The radiation is very low, you
can use any kind of housing.

1-2

1.1 Specifications

Overview

Form Factor
Board Size
CPU

System Memory

Second-level Cache
Chipset
Expansion Slots
Serial Port
Parallel Port

Floppy Interface

IDE Interface

USB Interface

PS/2 Mouse
Keyboard
RTC and Battery

BIOS

ATX
305 mm x 244 mm
Intel Pentium Processor P54C, PP/MT (P55C), AMD

K5/K6 and Cyrix 6x86/M2
FPM (Fast Page Mode) or EDO (Extended Data Output)

72-pin SIMM x4, and SDRAM 168-pin x2 maximum
256MB.

256KB or 512KB pipeline-burst cache onboard
Intel 82430TX PCIset
ISA x4 and PCI x4
Two serial ports UART 16C550 compatible
One parallel port supports standard parallel port (SPP),

enhanced parallel port (EPP) or extended capabilities port
(ECP).

Floppy interface supports 3.5 inches drives with 720KB,

1.44MB or 2.88MB format or 5.25 inches drives with
360KB, 1.2MB format

Dual-channel IDE interface support maximum 4 IDE hard
disks or CDROM, mode 4 , bus master hard disk drives and
Ultra DMA/33 mode hard drives are also supported.

Two USB ports supported by USB bracket, the BIOS also
supports USB driver to simulate legacy keyboard.

Mini-Din PS/2 mouse connector onboard.
Mini-Din PS/2 keyboard connector onboard.
RTC within Intel PIIX4 chipset, Battery is Lithium (CR-

2032).
AWARD Plug-and-Play, 2M bit Flash ROM BIOS

1-3

Overview

Suspend to Hard Drive

Modem Card Wake
Up

RTC Wake Up Timer
Synchronous

Switching Regulator
3V Over-current

Protection
CPU Thermal

Protection
CPU Fan Monitoring
System Voltage

Monitoring

Supported by BIOS, save your work to hard disk and resume
within a very short time. VESA compatible VGA and Sound
Blaster compatible sound card required.

Special circuit (patent applied) to support modem ring wake
up by external box modem or internal AOpen MP56 modem
card.

Program the date/time to wake up your system.
High efficient synchronous switching regulator for future

CPU.

3.3V 10A and 2.8V/2.9V (CPU core) 15A over-current
protection to prevent any accident short circuit.

Warning when CPU temperature is higher than 55 degree C.

Warning when CPU fan is malfunction.
Warning when system voltage (5V,12V,3.3V,2.8V) are

abnormal

1-4