COM20019I_0610 Datasheet, PDF (70/70 Pages) SMSC Corporation – Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

RAM
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip
Chapter 12 Appendix C
12.1 Software Identification of the COM20019I 3V Rev B and Rev C
In order to properly write software to work with the COM20019I 3V Rev B and C it is necessary to be able to identify the
different revisions of the part.
To identify the COM20019I 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 COM20019I 3V Rev B
* If the value read from Register-5 is 0xC0 then the part is a COM20019I 3V Rev C
Rev. 10-31-06
Page 70
DATASHEET
SMSC COM20019I 3.3V Rev.C