Specifications

PC/II+p Board Technical Reference Manual 12

1 Introduction

Thank you for your interest in the Megatel PC/II+p Cpu board, one of the 104Family of scalable complete

computer boards from Megatel. If you have chosen this board for your applications, you have chosen a

rugged, reliable high-performance and low-cost solution. This board has been engineered to be compatible

not only with other boards in the Megatel 104Family line, but also to the PC/104 industry standard for

embedded computer-based products.

This document has sections that are organized as follows: Reference Documents

, Specification Summary,

Settings

, Electrical Specifications, Component Summary, Functional Specifications, (which are presented

topical order), and System Resource Maps

sections.

The remaining sections contain Mass I/O Connector Pinout, Peripheral Attachment (QTB/dxp), Ordering

Information, and Physical Specifications.

This document also includes specifications for all connector interfaces, a component bill of materials for the

major parts on the board, component placement templates, a functional specification for the board's various

peripheral support features, and a list of the options for the board including the jumpers and manufacture

options. Please feel free to contact Megatel or one of its distributors or agents if you require more

information.

1.1 PC/II+p Overview

The basic PC/II+p is PC/104 compliant in its form factor and electrical interfaces. As a member of the

Megatel 104Family, it is easily interchangeable with other members of the family to provide the feature set

and performance range you require. The PC/II+p provides on-board 8-Bit or 16-Bit PC/104 bus connectors to

allow direct drop-in compatibility with existing and new PC/104 designs.

The PC/II+p board is powered by a standard 296-pin or 321-pin Low-Power Socket 7 or compatible

Processor. The board supports processors from Intel (Low Power Pentium MMX 166 & 266) and AMD (K6-

2E/233). The processor speed and voltage options are listed later in this document. The local 64-bit

processor bus operates at 66 MHz which directly interfaces to the ALI M1531B north bridge to provide an on-

board 33 MHz PCI bus and memory controller. The ALI M1543C south bridge interfaces directly to the PCI

bus, generates a full ISA bus, and provides AT architecture and legacy peripheral support.

Soldered down SDRAM is provided to support from 32 MB up to 64 MB of high-speed (10 ns or better)

memory. One or two banks of soldered SDRAM can be populated.

The board also contains a 256 KB flash device to hold system BIOS, and optionally contains a 32-pin DIP-

type socket that can be user-populated with a M-SYSTEM's Disk-On-Chip® or compatible device to provide

up to 144 MB or greater of Flash Disk memory.

A rich complement of peripheral controllers and interfaces in included. Optional Full Video is provided by the

Chips & Tech advanced 69030 controller that supports simultaneous CRT and a wide variety of 8/16/24-Bit

flat panels. Optional Ethernet is provided by the Crystal CS8900 controller with integrated frame buffer

memory and filters, and on-board transformers support either or both 10Base-T and AUI Ethernet interfaces.

An Ultra-33 ATA/IDE controller (provided by the M1543C south bridge) supports a primary controller with up

to four devices. AT-style Keyboard, PS/2-style mouse, and Floppy are provided by the M1543C south bridge.

Up to 2 full RS-232 Serial ports are also provided with optional on-board RS-232 Transceivers for all

standard RS-232 signals. A USB hub that supports two USB ports is supported by the M1543C, using either

FS (12 Mbits/Sec) or LS (1.5 Mbits/Sec). An up-to-date Y2K Real-Time Clock controller is provided, the

Dallas DS1685 that provides extended alarm and interrupt generation features, extended NVRAM, a unique

silicon serial number and other extended features.