COM20051 Datasheet, PDF (2/82 Pages) List of Unclassifed Manufacturers – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

TABLE OF CONTENTS
FEATURES ........................................................................................................................................................................ 1
GENERAL DESCRIPTION................................................................................................................................................1
PIN CONFIGURATION......................................................................................................................................................3
OVERVIEW ........................................................................................................................................................................ 4
DESCRIPTION OF PIN FUNCTIONS...............................................................................................................................4
BASIC ARCHITECTURE...................................................................................................................................................7
PROTOCOL DESCRIPTION...........................................................................................................................................12
NETWORK PROTOCOL ..................................................................................................................................................12
DATA RATES....................................................................................................................................................................12
NETWORK RECONFIGURATION...................................................................................................................................12
BROADCAST MESSAGES ..............................................................................................................................................14
EXTENDED TIMEOUT FUNCTION.................................................................................................................................14
LINE PROTOCOL.............................................................................................................................................................15
SYSTEM DESCRIPTION .................................................................................................................................................18
MICROCONTROLLER INTERFACE ...............................................................................................................................18
TRANSMISSION MEDIA INTERFACE ............................................................................................................................18
ARCNET CORE FUNCTIONAL DESCRIPTION .............................................................................................................24
MICROSEQUENCER .......................................................................................................................................................24
INTERNAL REGISTERS ..................................................................................................................................................24
INTERNAL RAM ...............................................................................................................................................................38
SOFTWARE INTERFACE................................................................................................................................................38
COMMAND CHAINING ....................................................................................................................................................42
RESET DETAILS ..............................................................................................................................................................45
INITIALIZATION SEQUENCE ..........................................................................................................................................45
IMPROVED DIAGNOSTICS.............................................................................................................................................46
COM20051 APPLICATIONS INFORMATION .................................................................................................................48
USING ARCNET DIAGNOSTICS TO OPTIMIZE YOUR SYSTEM................................................................................66
CABLING THE COM20051 ..............................................................................................................................................70
USING THE COM20051'S EMULATION MODE.............................................................................................................71
OPERATIONAL DESCRIPTION ......................................................................................................................................72
MAXIMUM GUARANTEED RATINGS.............................................................................................................................72
DC ELECTRICAL CHARACTERISTICS..........................................................................................................................72
TIMING DIAGRAMS .........................................................................................................................................................74
PACKAGE DIMENSIONS.................................................................................................................................................80
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