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COM20051I

Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

SMSC -> Microchip 

TABLE OF CONTENTS

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

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

PIN CONFIGURATION ................................................................................................................................................. 4

OVERVIEW ................................................................................................................................................................... 5

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

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

PROTOCOL DESCRIPTION ....................................................................................................................................... 13

NETWORK PROTOCOL ............................................................................................................................................. 13

DATA RATES .............................................................................................................................................................. 13

NETWORK RECONFIGURATION .............................................................................................................................. 13

BROADCAST MESSAGES ......................................................................................................................................... 15

EXTENDED TIMEOUT FUNCTION ............................................................................................................................ 15

LINE PROTOCOL ....................................................................................................................................................... 15

SYSTEM DESCRIPTION ............................................................................................................................................ 18

MICROCONTROLLER INTERFACE........................................................................................................................... 18

TRANSMISSION MEDIA INTERFACE........................................................................................................................ 18

ARCNET CORE FUNCTIONAL DESCRIPTION ......................................................................................................... 23

MICROSEQUENCER.................................................................................................................................................. 23

INTERNAL REGISTERS ............................................................................................................................................. 23

INTERNAL RAM.......................................................................................................................................................... 35

SOFTWARE INTERFACE........................................................................................................................................... 35

COMMAND CHAINING ............................................................................................................................................... 38

RESET DETAILS......................................................................................................................................................... 40

INITIALIZATION SEQUENCE ..................................................................................................................................... 40

IMPROVED DIAGNOSTICS........................................................................................................................................ 41

COM20051I APPLICATIONS INFORMATION ............................................................................................................ 43

USING ARCNET DIAGNOSTICS TO OPTIMIZE YOUR SYSTEM ............................................................................. 60

CABLING THE COM20051I ........................................................................................................................................ 64

USING THE COM20051I'S EMULATION MODE ........................................................................................................ 65

OPERATIONAL DESCRIPTION.................................................................................................................................. 66

MAXIMUM GUARANTEED RATINGS ........................................................................................................................ 66

DC ELECTRICAL CHARACTERISTICS ..................................................................................................................... 66

TIMING DIAGRAMS.................................................................................................................................................... 68

PACKAGE DIMENSIONS ........................................................................................................................................... 74

SMSC DS – COM20051I

Page 3

Rev. 03/27/2000

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