COM20020D datasheet(3/72 Pages) SMSC

Part #	COM20020D

Description	ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM

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Manufacturer	SMSC [SMSC Corporation]

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TABLE OF CONTENTS

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

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

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

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

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

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

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

NETWORK RECONFIGURATION ................................................................................................. 9

BROADCAST MESSAGES.......................................................................................................... 10

EXTENDED TIMEOUT FUNCTION ............................................................................................. 10

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

SYSTEM DESCRIPTION ................................................................................................................. 13

MICROCONTROLLER INTERFACE ............................................................................................ 13

TRANSMISSION MEDIA INTERFACE ......................................................................................... 17

FUNCTIONAL DESCRIPTION ......................................................................................................... 22

MICROSEQUENCER .................................................................................................................. 22

INTERNAL REGISTERS ............................................................................................................. 25

INTERNAL RAM ......................................................................................................................... 38

COMMAND CHAINING ............................................................................................................... 43

INITIALIZATION SEQUENCE...................................................................................................... 45

IMPROVED DIAGNOSTICS ........................................................................................................ 46

OPERATIONAL DESCRIPTION ...................................................................................................... 49

MAXIMUM GUARANTEED RATINGS* ........................................................................................ 49

DC ELECTRICAL CHARACTERISTICS....................................................................................... 49

TIMING DIAGRAMS ........................................................................................................................ 52

APPENDIX A................................................................................................................................... 67

APPENDIX B: EXAMPLE OF INTERFACE CIRCUIT DIAGRAM TO ISA BUS ................................ 71

APPENDIX C................................................................................................................................... 72

SOFTWARE IDENTIFICATION OF THE COM20020 REV B, REV C AND REV D ............................ 72

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

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SMSC Corporation	COM20020	340Kb / 72P	COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
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Similar Description - COM20020D

Manufacturer	Part #	Datasheet	Description
SMSC Corporation	COM20020	340Kb / 72P	COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
	COM20020	536Kb / 82P	Universal Local Area Network Controller with 2K x 8 On-Board RAM
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Stanford Microdevices	COM9026	1Mb / 12P	LOCAL AREA NETWORK CONTROLLER LANC-TM
SMSC Corporation	COM20020I_0609	478Kb / 69P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
	COM20020I	480Kb / 65P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
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