COM90C66 Datasheet, PDF (2/76 Pages) SMSC Corporation – ARCNET Controller/Transceiver with AT Interface and On-Chip RAM

TABLE OF CONTENTS
FEATURES _{........................................................................................................................................................................} 1
GENERAL DESCRIPTION _{................................................................................................................................................} 1
PIN CONFIGURATION...................................................................................................................................................... 3
DESCRIPTION OF PIN FUNCTIONS............................................................................................................................... 4
PROTOCOL DESCRIPTION............................................................................................................................................. 9
NETWORK PROTOCOL........................................................................................................................................... 9
NETWORK RECONFIGURATION _{...........................................................................................................................} 9
BROADCAST MESSAGES _{.....................................................................................................................................} 10
EXTENDED TIMEOUT FUNCTION _{........................................................................................................................} 10
LINE PROTOCOL.................................................................................................................................................... 10
SYSTEM DESCRIPTION..................................................................................................................................................12
MICROPROCESSOR INTERFACE _{.........................................................................................................................12}
TRANSMISSION MEDIA INTERFACE _{....................................................................................................................13}
FUNCTIONAL DESCRIPTION _{.........................................................................................................................................13}
MICROSEQUENCER _{...............................................................................................................................................13}
ADDRESS DECODING _{............................................................................................................................................19}
INTERNAL REGISTERS _{..........................................................................................................................................22}
INTERNAL RAM _{.......................................................................................................................................................29}
SOFTWARE INTERFACE........................................................................................................................................29
SOFTWARE COMPATIBILITY CONSIDERATIONS _{..............................................................................................31}
COMMAND CHAINING _{............................................................................................................................................32}
RESET DETAILS _{......................................................................................................................................................34}
READ AND WRITE CYCLES _{...................................................................................................................................35}
NODE ID LOGIC _{.......................................................................................................................................................43}
TRANSMIT/RECEIVE LOGIC _{..................................................................................................................................43}
IMPROVED DIAGNOSTICS.....................................................................................................................................43
OSCILLATOR _{...........................................................................................................................................................45}
OPERATIONAL DESCRIPTION _{......................................................................................................................................46}
MAXIMUM GUARANTEED RATINGS _{.....................................................................................................................46}
DC CHARACTERISTICS..........................................................................................................................................46
TIMING DIAGRAMS _{.........................................................................................................................................................49}
Please see Addendum 1 entitled Data Sheet Errata for Revision B COM90C66, which discusses changes to this
data sheet which apply to the Revision B device, on Page 62.
Please see Addendum 2 entitled Data Sheet Errata for Revision D COM90C66, which discusses changes to this
data sheet which apply to the Revision D device, on Page 64.
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