COM20020I_06 Datasheet, PDF (65/65 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
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:
1. Write 0x98 to Register-6 (Address = 6)
2. Write 0x02 to Register-5 (Address = 5)
3. Read Register-6
* 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
4. Write 0x80 to Register-5
5. Read Register-5
* If the value read from Register-5 is 0x00 then the part is a COM20020I Rev C
• If the value read from Register-5 is 0x80 then the part is a COM20020I Rev D
SMSC COM20020I 3.3V
Page 65
DATASHEET
Revision 12-06-06