TABLE OF CONTENTS
FEATURES
GENERAL DESCRIPTION
PIN CONFIGURATION
DESCRIPTION OF PIN FUNCTIONS
PROTOCOL DESCRIPTION
NETWORK PROTOCOL
1
1
3
4
8
8
8
8
9
9
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DATA RATES
NETWORK RECONFIGURATION
BROADCAST MESSAGES
EXTENDED TIMEOUT FUNCTION
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LINE PROTOCOL
10
12
12
15
18
18
18
30
30
35
37
38
38
40
41
41
41
45
57
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SYSTEM DESCRIPTION
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MICROCONTROLLER INTERFACE
TRANSMISSION MEDIA INTERFACE
FUNCTIONAL DESCRIPTION
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MICROSEQUENCER
INTERNAL REGISTERS
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INTERNAL RAM
SOFTWARE INTERFACE
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COMMAND CHAINING
RESET DETAILS
INITIALIZATION SEQUENCE
IMPROVED DIAGNOSTICS
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OSCILLATOR
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OPERATIONAL DESCRIPTION
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MAXIMUM GUARANTEED RATINGS
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DC CHARACTERISTICS
TIMING DIAGRAMS
ERRATA SHEET
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
2
SMSC [ SMSC CORPORATION ]
