COM20020I3V-HT Standard Microsystems (SMSC), COM20020I3V-HT Datasheet - Page 65

• Manufacturer Part Number: COM20020I3V-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20020I3V-HT

• Number Of Transceivers: 1
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
12.0 APPENDIX B
12.1 Software Identification of the COM20020I Rev B, Rev C and Rev D
In order to properly write software to work with the COM20020I Rev B, C and D it is necessary to be able to identify
the different revisions of the part.
To identify the COM20020I Revision follow the following procedure:
SMSC COM20020I 3.3V
•
* If the value read from Register-6 is 0x98 then the part is a COM20020I Rev B or earlier
* If the value read from Register-6 is 0x9A then go to next step below
* If the value read from Register-5 is 0x00 then the part is a COM20020I Rev C
1.
2.
3.
4.
5.
If the value read from Register-5 is 0x80 then the part is a COM20020I Rev D
Write 0x98 to Register-6 (Address = 6)
Write 0x02 to Register-5 (Address = 5)
Read Register-6
Write 0x80 to Register-5
Read Register-5
DATASHEET
Page 65
Revision 12-06-06