COM20020I3V-DZD datasheet(5/69 Pages) SMSC

Part #	COM20020I3V-DZD

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

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Manufacturer	SMSC [SMSC Corporation]

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

SMSC COM20020I 3.3V Rev.E

Page 5

Revision 09-11-06

DATASHEET

Chapter 1

General Description

SMSC's COM20020I 3V 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 and embedded control environments using an ARCNET protocol engine. The flexible

microcontroller and media interfaces, eight-page message support, and extended temperature range of the COM20020I

3V make it the only true network controller optimized for use in industrial and embedded 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

COM20020I 3V.

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 COM20020I 3V the highest performance embedded

communications device available. With only one COM20020I 3V and one microcontroller, a complete communications

node may be implemented.

For more details on the ARCNET protocol engine and traditional dipulse signaling schemes, please refer to

the ARCNET Local Area Network Standard, available from Standard Microsystems Corporation or the

ARCNET Designer's Handbook, available from Datapoint Corporation.

For more detailed information on cabling options including RS485, transformer-coupled RS-485 and Fiber

Optic interfaces, please refer to the following technical note which is available from Standard Microsystems

Corporation:

Technical Note 7-5 - Cabling Guidelines for the COM20020I 3V ULANC.

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