FASTSCAN and 2 clock domains

[ultraunix]

HI all,
has any one experience in using FASTSCAN for scan pattern generation in a design where there are 2 (or more) clock domains.
I want to pulse syncronously the two clocks during shift; then pulse sequestially in the capture phase.
In this way it is possible to check also the connections between the different clock domains.

Does someone has experience in this?

Thanks.

 

[alanray]

2 clock domain shift clock

use latch to pass differnet clock domain

 

[mitsubishi]

See attached file!!

 

[GoodMan]

This is a good paper! :wink:

 

[ultraunix]

Hi Alanray, using 2 clocks input you increase the coverage because you check the connection between clock domains. Finaly I have set it up and it worked well! For me is better to avoid latches and user two o more clocks input during scan.