COM20020ILJP datasheet(6/72 Pages) MICROCHIP

6 / 72 page

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

Datasheet

Revision 12-05-06

Page 6

SMSC COM20020I Rev D

DATASHEET

Chapter 1

General Description

SMSC's COM20020ID is a member of the family of Embedded ARCNET Controllers from Standard

Microsystems Corporation. The device is a general purpose communications controller for networking

microcontrollers and intelligent peripherals in industrial, automotive, and embedded control environments

using an ARCNET

® protocol engine. The small 28 pin package, flexible microcontroller and media

interfaces, eight- page message support, and extended temperature range of the COM20020ID make it

the only true network controller optimized for use in industrial, embedded, and automotive applications.

Using an ARCNET protocol engine is the ideal solution for embedded control applications because it

provides a deterministic token-passing protocol, a highly reliable and proven networking scheme, and a

data rate of up to 5 Mbps when using the COM20020ID.

A token-passing protocol provides predictable response times because each network event occurs within a

predetermined time interval, based upon the number of nodes on the network. The deterministic nature of

ARCNET is essential in real time applications. The integration of the 2Kx8 RAM buffer on-chip, the

Command Chaining feature, the 5 Mbps maximum data rate, and the internal diagnostics make the

COM20020ID the highest performance embedded communications device available. With only one

COM20020ID and one microcontroller, a complete communications node may be implemented.

COM20020ILJP датащи(PDF) 6 Page - Microchip Technology