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How to perform ocv-aware CTS?

Rajesh Vembu

Can someone share some thoughts on how to perform ocv-aware CTS?

Is there any difference, in considering ocv factor, if we do CTS it in single mode or multi-mode?

  • Kari

     Please see the section in the User Guide called "Delay Variation and OCV" in the "Synthesizing Clock Trees" chapter.

  • raffa

    Hi Kari,

    The manual doesn't say much on how to perform OCV aware CTS.

    The OCV aware CTS would help a lot in hold fixing. Sometimes two

    FFs that are very close and talk to each other, belong to 2 completely

    different branches of clock tree; the OCV aware CTS would bring one

    of the FFs on the other branch swapping w/ another FFs. Of course we

    cannot expect to clean up everything but this should allow hold violation

    reduction. To do this the "feature" should look at the constraints and being

    timing aware to be able to "see" the hold paths.

    Regards,

     Raff

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