How to know how many scan chains do I need for a chip (DFT)?

[nobond]

Never touch DFT before although several chips already.
Just wondering when buid the scan chip in the whole chip, how i can work out how many
scan chains i need? I assume one scan chain per chip is just not practical at all?

 

[jery_cn]

DFT question

by default,a scan chain to one clock .but you can identify the total scan-chain you need by mix multi clock and their edge. there is some configuture command and option in doing this. find them in dft compiler manual.Good Luck.

 

[gold_2007]

Re: DFT question

more the number of scan chain , more is the number of input pin and less testing time .

 

[deh_fuhrer]

Re: DFT question

set_scan_configuration -chain_count n

where n is the number of scan chains...

 

[energeticdin]

Re: DFT question

Hope this will be helpful

https://www.vlsichipdesign.com/knowledgehome.html