COM20020I_0609 Datasheet, PDF (3/69 Pages) SMSC Corporation – 5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
TABLE OF CONTENTS
CHAPTER 1 GENERAL DESCRIPTION................................................................................................................5
CHAPTER 2 PIN CONFIGURATIONS ...................................................................................................................6
CHAPTER 3 DESCRIPTION OF PIN FUNCTIONS ...............................................................................................8
CHAPTER 4 PROTOCOL DESCRIPTION...........................................................................................................11
4.1 NETWORK PROTOCOL ...................................................................................................................................11
4.2 DATA RATES ................................................................................................................................................11
4.2.1
Selecting Clock Frequencies Above 2.5 Mbps .................................................................................... 11
4.3 NETWORK RECONFIGURATION........................................................................................................................12
4.4 BROADCAST MESSAGES ................................................................................................................................12
4.5 EXTENDED TIMEOUT FUNCTION ......................................................................................................................12
4.6 LINE PROTOCOL............................................................................................................................................13
CHAPTER 5 SYSTEM DESCRIPTION ................................................................................................................15
5.1 MICROCONTROLLER INTERFACE .....................................................................................................................15
5.2 TRANSMISSION MEDIA INTERFACE ..................................................................................................................19
CHAPTER 6 FUNCTIONAL DESCRIPTION........................................................................................................24
6.1 MICROSEQUENCER........................................................................................................................................24
6.2 INTERNAL REGISTERS ............................................................................................................................25
6.3 INTERNAL RAM..............................................................................................................................................35
6.4 COMMAND CHAINING .....................................................................................................................................40
6.5 INITIALIZATION SEQUENCE..............................................................................................................................42
6.6 IMPROVED DIAGNOSTICS................................................................................................................................42
CHAPTER 7 OPERATIONAL DESCRIPTION .....................................................................................................45
7.1 MAXIMUM GUARANTEED RATINGS* .................................................................................................................45
7.2 DC ELECTRICAL CHARACTERISTICS ................................................................................................................45
CHAPTER 8 TIMING DIAGRAMS .......................................................................................................................48
CHAPTER 9 PACKAGE OUTLINES ...................................................................................................................63
CHAPTER 10 APPENDIX A...................................................................................................................................65
CHAPTER 11 APPENDIX B...................................................................................................................................68
CHAPTER 12 APPENDIX C...................................................................................................................................69
12.1 SOFTWARE IDENTIFICATION OF THE COM20020I 3V REV D AND REV E ............................................................69
SMSC COM20020I 3.3V Rev.E
Page 3
DATASHEET
Revision 09-11-06