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

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nobond

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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?
 

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.
 

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Re: DFT question

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

Re: DFT question

set_scan_configuration -chain_count n

where n is the number of scan chains...
 

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