AOpen AP57 Manuale utente

1-1

Chapter 1

Overview

The AP57 is a high-performance Pentium -based system board that utilizes

the PCI/ISA architecture. It integrates the SiS 5571 PCIset, a super I/O

controller, and a PCI mode 4 enhanced IDE controller with bus master

support to enhance system performance. It has four single in-line memory

module (SIMM) sockets that allow system memory expansion up to a

maximum of 256MB. It also supports 256KB and 512KB pipelined-burst

second-level cache.

One main feature of AP57 is the green power-management function that

extends energy conservation from system components to display monitor. It

complies with the power-saving standards of the U.S. Environmental

Protection Agency (EPA) Energy Star program.

The AP57 board measures 220 mm x 250 mm.

Overview

1-2

1.1 Specifications

Form Factor Baby AT

Board Size 220mm x 250mm

CPU Intel Pentium Processor P54C, PP/MT (P55C), AMD

K5 and Cyrix 6x86

System Memory FPM (Fast Page Mode) or EDO (Extended Data

Output) 72-pin SIMM x4, maximum 256MB.

Second-level Cache 256KB or 512KB pipelined-burst cache onboard

Chipset SiS 5571 PCIset (480-pin BGA Package)

Expansion Slots ISA x3 and PCI x4

Serial Port Two serial ports UART 16C550 compatible

Parallel Port One parallel port supports standard parallel port

(SPP), enhanced parallel port (EPP) or extended

capabilities port (ECP).

Floppy Interface Floppy interface supports 3.5-inch drive with 720KB,

1.44MB or 2.88MB format or

5.25-inch drive with 360KB, 1.2MB format

IDE Interface Dual-channel IDE interface supports a maximum of 4

IDE hard disks or CDROM.

Mode 4 and bus master hard disk drives are also

supported.

USB Interface

(optional) USB bracket that supports two USB ports . The

BIOS also supports USB driver to simulate

legacy keyboard.

PS/2 Mouse Via PS/2 mouse bracket

Keyboard Default: AT compatible keyboard

Mini-DIN PS/2 keyboard connector is optional.

BIOS Award Plug-and-Play Flash ROM BIOS

RTC RTC build in chipset

Battery Lithium (CR2032)

Overview

1-3

1.2 Board Layout

2 34 567 8 9

11 12

1819

1Keyboard connector: The default is AT-compatible keyboard. The

P/2-compatible mini-DIN keyboard connector is

optional.

2Power connector: Provides mainboard power.

3FDC connector: Connects to 3.5-inch/5.25-inch floppy drives.

4Printer connector: Connects to parallel printer.

5IDE1 connector: Primary channel for IDE hard disk or CDROM,

accepts a maximum of two devices.

6SIMM sockets: Accepts 72-pin fast page mode or EDO

DRAM module for system main memory.

7IDE2 connector: Secondary channel for IDE hard disk or

CDROM, accepts a maximum of two devices.

8SiS chipset: SiS 5571 cache/memory controller in BGA

package.

9Battery: CR2032-compatible

10 Pipelined-burst cache: 256/512KB secondary level cache. Cache is

used to enhance memory performance.

11 CPU socket: Accepts Intel Pentium P54C, PP/MT (P55C),

AMD K5, and Cyrix 6x86 CPUs.

Overview

1-4

12 Voltage Regulators w/ Heatsink: The regulator is used to supply CPU

voltage.

13 IrDA connector: Wireless Infrared connector, used as COM2.

14 Front-panel connector: Connector for front panel power reset,

suspend switches and power or green LED.

15 IDE LED connector: For front panel IDE LED.

16 CPU fan connector: +12V 2-pin connector for CPU fan.

17 ISA slots: Accepts 8-MHz ISA bus expansion cards.

18 PCI slots: Accepts 33-MHz PCI bus expansioncards

19 Keyboard controller: Controls keyboard input/output functions.

20 USB connector (optional):Universal Serial Bus (USB). The USB is a

new 4-pin serial interface that allows easy

installation and cascading of USB devices..

21 Super I/O controller: SMC 669-compatible I/O control chip including

two serial ports (COM1/COM2), one parallel

port (printer), and floppy controller.

22 COM1 connector: Serial port 1.

23 COM2 connector: Serial port 2.

24 PS/2 mouse connector: Connects to PS/2 mouse bracket for

PS/2-compatible mouse. Unlike serial mouse

from COM1/COM2, the PS/2 mouse signal is

similar as the keyboard and is also controlled

by the keyboard controller.

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