PrimeTime Vs primeTime SI

[edagops]

Hi,
What is the difference in PT analyis compared with PTSI analysis ?
As per my understanding PTSI is pessimistic compared with PT (for the same margins) due to cross talk factor has been taken into account for SI analysis.
If so, Why shouldn't we signoff the design using PTSI instead of PT ?

Can you please help..



Thanks,
edagops

 

[ljxpjpjljx]

when your design goes into deep process(0.65, 0.45), the cross talk impact will become huge, so you need the PTSI to do timing analysis which will be more accurate!

 

[itsmeteja]

In general PTSI signoff margins are around half of PT margins.

 

[edagops]

Thanks..
If we use same margin (full margin) for both PT and PTSI..
Will PTSI covers all the checks performed in PT ?

Regards,
edagops..