COM20019I3VLJP 参数 Datasheet PDF下载

Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip

RAM

Chapter 1

General Description

SMSC's COM20019I 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 COM20019I 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 312.5 Kbps when using the COM20019I

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 maximum data rate, and the internal diagnostics make the COM20019I

3V the highest performance embedded communications device available. With only one COM20019I 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 COM20020

ULANC.

Rev. 10-31-06

Page 6

SMSC COM20019I 3.3V Rev.C

DATASHEET