COM20051 datasheet(2/82 Pages) SMSC

2 / 82 page

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

80 Arkay Drive

Hauppauge, NY 11788

(631) 435-6000

FAX (631) 273-3123

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