Anyone have done transition DFT testing?

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feel_on_on

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how much coverage have u gain with transition fault?

Do u need to generate 2 kinds of pattern ? Stuck pattern and transition pattern?

How about your test coverage on stuck pattern and transition pattern?
 

The stuck-at patterns and at-speed patterns are definitely different, and whether you run both is up to you. If you catch a fault with a transition delay pattern, it is caught regardless, so you could run the transition patterns, and then the stuck-at patterns to make up for the lack of coverage achieved with the transition patterns. However, you do lose diagnostic information that way. If a device fails transition test, is it because it's too slow? or is it actually stuck? No way to tell unless you run both sets complete.

John
DFT Digest
 

Hi,

we have to genrate the transhition faults frist since we can use TFT pattrens to detect S@faults. but we cannot use S@faults to detect transhition faults.

Regards,
Ramesh.S
 

Usually u will get the coverage 90% for transition DFT. here faults are detected only transition level i.e 0 to 1 or 1 or 0. After generating the Transition faults, then fault grade those faults, after words u can load these faults to Stuckt patterns.
 

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