DFT: What is sequential depth?

[rsrirama]

seq depth

hi all,
what is sequential depth in DFT. are non-scan cells results in seq depth ?

thanks in advance

 

[casey480]

Re: seq depth

sequential depth is the number of capture cycles executed before unloading your scan chains.

so if your sequential depth was one, you would have a pattern sequence as follows:

1) set scan_enable, load scan chain, unset scan_enable
2) execute 1 capture clock
3) set scan_enable, unload scan chains.

Increasing your sequential depth allows you to get better fault coverage.