COM20020-5 datasheet, PDF - EEWORLD Datasheet

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COM20020-5: Descriptionuniversal local area network controller with 2K x 8 On-board ram; File Size243KB，58 Pages; ManufacturerAll Sensors

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COM20020-5 Overview

universal local area network controller with 2K x 8 On-board ram

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COM20020-5

COM20020-5 ULANC

Universal Local Area Network Controller

with 2K x 8 On-Board RAM

FEATURES

•

24-Pin Embedded Network Controller/

Transceiver/RAM

Ideal for Industrial/Factory Automation

and Automotive Applications

Deterministic, 5 Mbps, Token Passing

ARCNET Protocol

Minimal Microcontroller and Media

Interfaces

Flexible Microcontroller Interface for Use

with 80XX, 68XX, etc.

Automatically Detects Type of

Microcontroller Interface:

-Non-Multiplexed or Multiplexed Bus

-Separate nRD & nWR Lines or DIR &

nDS Lines

Full 2Kx8 On-Chip RAM

Command Chaining for Top Performance

Reduced Reconfiguration Times

Sequential Access to Internal RAM

Software Programmable Node ID

Duplicate Node ID Detection

Powerful Diagnostics

•

Receive All Mode

Data Rates from 5 Mbps to 312.5 Kbps

24-Pin DIP or 28-Pin PLCC Package

Flexible Media Interface:

- RS485 Differential Driver Interface for

Low Cost, Low Power, High Reliability

- Backplane Mode for Direct Connection to

Media in Short Distance Applications

Eight, 256-Byte Pages Allow 4 Pages TX

and RX Plus Scratch-Pad Memory

No Wait-State Arbitration

Programmable TXEN Polarity

Next ID Readable

Internal Clock Prescaler for Slower Network

Speed without Slowing Arbitration

Operating Temperature Range of -40 C to

+85 C

Self-Reconfiguring Protocol

Supports up to 255 Nodes

Supports Various Network Topologies (Star,

Tree, Bus...)

CMOS, Single +5V Supply

•

GENERAL DESCRIPTION

SMSC's COM20020-5 is a member of the family

of Industrial Network Controllers from Standard

Microsystems Corporation. The device is a

special purpose communications controller for

networking microcontrollers and intelligent

peripherals in industrial, automotive, and

embedded control environments using an

ARCNET® protocol engine. The small 24-

pin package, flexible microcontroller and media

interfaces, eight-page message support, and

extended temperature range of the COM20020-5

make it the only true network controller

optimized for use in industrial and automotive

applications.

Using an ARCNET protocol

engine is the ideal solution for factory

automation applications because it provides a

token-passing

TABLE OF CONTENTS

FEATURES ......................................................................................................................................................................... 1

GENERAL DESCRIPTION ................................................................................................................................................. 1

PIN CONFIGURATION ....................................................................................................................................................... 3

DESCRIPTION OF PIN FUNCTIONS ................................................................................................................................ 4

PROTOCOL DESCRIPTION .............................................................................................................................................. 8

NETWORK PROTOCOL ............................................................................................................................................. 8

DATA RATES ............................................................................................................................................................... 8

NETWORK RECONFIGURATION .............................................................................................................................. 8

BROADCAST MESSAGES .......................................................................................................................................... 9

EXTENDED TIMEOUT FUNCTION ............................................................................................................................. 9

LINE PROTOCOL....................................................................................................................................................... 10

SYSTEM DESCRIPTION .................................................................................................................................................. 12

MICROCONTROLLER INTERFACE ......................................................................................................................... 12

TRANSMISSION MEDIA INTERFACE ...................................................................................................................... 15

FUNCTIONAL DESCRIPTION ......................................................................................................................................... 18

MICROSEQUENCER ................................................................................................................................................. 18

INTERNAL REGISTERS ............................................................................................................................................ 18

INTERNAL RAM ......................................................................................................................................................... 30

SOFTWARE INTERFACE ......................................................................................................................................... 30

COMMAND CHAINING .............................................................................................................................................. 35

RESET DETAILS ........................................................................................................................................................ 37

INITIALIZATION SEQUENCE .................................................................................................................................... 38

IMPROVED DIAGNOSTICS ...................................................................................................................................... 38

OSCILLATOR ............................................................................................................................................................. 40

OPERATIONAL DESCRIPTION ...................................................................................................................................... 41

MAXIMUM GUARANTEED RATINGS ....................................................................................................................... 41

DC CHARACTERISTICS ........................................................................................................................................... 41

TIMING DIAGRAMS ................................................................................................................................................... 45

ERRATA SHEET............................................................................................................................................................... 57

For more details on the ARCNET protocol engine and traditional dipulse signalling 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.

80 Arkay Drive

Hauppauge, NY 11788

(516) 435-6000

FAX (516) 273-3123

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