COM20051 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

COM20051

Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface

SMSC -> Microchip 

TABLE OF CONTENTS

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

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

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

OVERVIEW.......................................................................................................................................4

DESCRIPTION OF PIN FUNCTIONS ................................................................................................5

BASIC ARCHITECTURE ...................................................................................................................8

PROTOCOL DESCRIPTION............................................................................................................14

NETWORK PROTOCOL............................................................................................................14

DATA RATES ............................................................................................................................14

NETWORK RECONFIGURATION .............................................................................................14

BROADCAST MESSAGES ........................................................................................................16

EXTENDED TIMEOUT FUNCTION............................................................................................16

LINE PROTOCOL......................................................................................................................17

SYSTEM DESCRIPTION ..................................................................................................................20

MICROCONTROLLER INTERFACE ..........................................................................................20

TRANSMISSION MEDIA INTERFACE .......................................................................................20

ARCNET CORE FUNCTIONAL DESCRIPTION ................................................................................28

MICROSEQUENCER.................................................................................................................28

INTERNAL REGISTERS............................................................................................................28

INTERNAL RAM ........................................................................................................................40

COMMAND CHAINING..............................................................................................................44

RESET DETAILS .......................................................................................................................47

INITIALIZATION SEQUENCE ....................................................................................................47

IMPROVED DIAGNOSTICS.......................................................................................................48

COM20051+ APPLICATIONS INFORMATION..................................................................................60

USING ARCNET DIAGNOSTICS TO OPTIMIZE YOUR SYSTEM.....................................................78

CABLING THE COM20051+ .............................................................................................................82

USING THE COM20051+'S EMULATION MODE ..............................................................................83

OPERATIONAL DESCRIPTION........................................................................................................84

MAXIMUM GUARANTEED RATINGS ........................................................................................84

DC ELECTRICAL CHARACTERISTICS .....................................................................................84

TIMING DIAGRAMS ..................................................................................................................86

80 Arkay Drive

Hauppauge, NY 11788

(516) 435-6000

FAX (516) 273-3123

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