COM20020I_0609 Datasheet, PDF (69/69 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
Chapter 12 Appendix C
12.1 Software Identification of the COM20020I 3V Rev D and Rev E
In order to properly write software to work with the COM20020I 3V Rev D and E it is necessary to be able to identify
the different revisions of the part.
To identify the COM20020I 3V Revision follow the following procedure:
1. Write 0x00 to Register-5
2. Read Register-5 Æ The value read from Register-5 must be 0x00.
3. Write 0xC0 to Register-5
4. Read Register-5*
* If the value read from Register-5 is 0x80 then the part is a COM20020I 3V Rev D
* If the value read from Register-5 is 0xC0 then the part is a COM20020I 3V Rev E
SMSC COM20020I 3.3V Rev.E
Page 69
DATASHEET
Revision 09-11-06