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RC -- how to report the hold viols ?

nozuey

Hi

I need to run a hold check on some paths to see the mutlicycle paths are working correctly, but I couldn't find the option to report the min path with report timing. -help doesn't show anything for hold check(as far as i see), and I didn't find anything in users manual and quick reference either.

How can I report the hold paths on RC ?

thanks

  • Hi nozuey, RTL Compiler does not perform hold analysis. Addressing hold issues in synthesis is counter-productive since it tends to result in excessive buffering, power, etc. I have not seen a flow with hold fixing in synthesis in quite some time. Why would you want to do this ? gh-

  • yes, I'm aware that we don't run hold analysis during the synthesis, but we need to have the constraints for hold check in SDC that is passed to the backend, and I need to validate that hold constrains is properly set before handing it to the backend team.

    DC has -delay min option if I remember correctly. Does RC have the equivalent command to that ?

     

  • Hi nozuey, RC does not perform hold analysis. I would suggest conformal constraint designer(CCD) for ensuring your constraints are correct, realistic and consistent. Seeing a hold violation in a report will not tell you that the constraints are correct.and/or feasible. Yes, it will confirm that some of the constraints have been interpreted. Correctness would be better verified in tools like CCD, Fishtail, etc. which are meant for such purpose. gh-

  •  nozuey,

     I agree with grasshopper's comments, however, I would like to make it clear that RC will accept hold related constraints and write them out with the write_sdc command.

     If you simply want to see a "hold" timing report before passing the SDC to the backend, then you should use an STA tool, such as ETS.  BTW... RC has a write_ets command to make that very simple.

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