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COM20020-5 Datasheet(PDF) 2 Page - SMSC Corporation |
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COM20020-5 Datasheet(HTML) 2 Page - SMSC Corporation |
2 / 58 page 2 TABLE OF CONTENTS FEATURES .........................................................................................................................................................................1 GENERAL DESCRIPTION .................................................................................................................................................1 PIN CONFIGURATION.......................................................................................................................................................3 DESCRIPTION OF PIN FUNCTIONS ................................................................................................................................4 PROTOCOL DESCRIPTION ..............................................................................................................................................8 NETWORK PROTOCOL .............................................................................................................................................8 DATA RATES ...............................................................................................................................................................8 NETWORK RECONFIGURATION ..............................................................................................................................8 BROADCAST MESSAGES ..........................................................................................................................................9 EXTENDED TIMEOUT FUNCTION.............................................................................................................................9 LINE PROTOCOL.......................................................................................................................................................10 SYSTEM DESCRIPTION..................................................................................................................................................12 MICROCONTROLLER INTERFACE .........................................................................................................................12 TRANSMISSION MEDIA INTERFACE ......................................................................................................................15 FUNCTIONAL DESCRIPTION .........................................................................................................................................18 MICROSEQUENCER .................................................................................................................................................18 INTERNAL REGISTERS ............................................................................................................................................18 INTERNAL RAM .........................................................................................................................................................30 SOFTWARE INTERFACE .........................................................................................................................................30 COMMAND CHAINING ..............................................................................................................................................35 RESET DETAILS........................................................................................................................................................37 INITIALIZATION SEQUENCE....................................................................................................................................38 IMPROVED DIAGNOSTICS ......................................................................................................................................38 OSCILLATOR .............................................................................................................................................................40 OPERATIONAL DESCRIPTION ......................................................................................................................................41 MAXIMUM GUARANTEED RATINGS.......................................................................................................................41 DC CHARACTERISTICS ...........................................................................................................................................41 TIMING DIAGRAMS ...................................................................................................................................................45 ERRATA SHEET...............................................................................................................................................................57 For more details on the ARCNET protocol engine and traditional dipulse signalling 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. 80 Arkay Drive Hauppauge, NY 11788 (516) 435-6000 FAX (516) 273-3123 |
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