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Difference results when re-run placedesign

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I've got every time a difference result when I ran placedesign (related to congestion) after I've changed some power grid even though the same placementguides have been used.
My question is how can I specify the startpoint  (sheetfactor ??? ) so that the placedesign should start at the same point.

Thanks.


Originally posted in cdnusers.org by DN
Parents

  • Thanks for your quickly reponses!

    I know that several factor will involve that cause diffrence in result but I'm 
    using the same options, same guides, same netlist,... from the previous run.
    And it looks like the congestion is changing every time because some modules
    are placed in an another areas.
    The result has not much impact for the timing in generally. But for a high frequent design when a little bit change of congestions can harm the timing clean on some critical paths.
    For more details what I've used:
    - cadence_fe 04.20-s315_1_USR2
    - Hierarchy netlist
    - Timingdriven
    - nopreplaceopt
    - noreordescan

    Regards,


    Originally posted in cdnusers.org by DN
Reply

  • Thanks for your quickly reponses!

    I know that several factor will involve that cause diffrence in result but I'm 
    using the same options, same guides, same netlist,... from the previous run.
    And it looks like the congestion is changing every time because some modules
    are placed in an another areas.
    The result has not much impact for the timing in generally. But for a high frequent design when a little bit change of congestions can harm the timing clean on some critical paths.
    For more details what I've used:
    - cadence_fe 04.20-s315_1_USR2
    - Hierarchy netlist
    - Timingdriven
    - nopreplaceopt
    - noreordescan

    Regards,


    Originally posted in cdnusers.org by DN
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