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COM20020I-DZD

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

SMSC -> Microchip 

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

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