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InsertRepeater violations

spach

hi

I am using insertRepeater command with  500um wire length & maxCap 0.51pf as rules, after using this command at preroute & postroute stages still I have failed nets with wire length violation(nets having lenghts > 500um) & no maxCap violation.

Can any one tell me a method to fix interRepeater failed nets at postRoute stage.

Regards,

spach 

 

  • Hi spach,

    there is two main raisons why insertRepeater do not fix long nets :

    1. Net has a dontTouch
      typically, clock nets are let untouch by insertRepeater
      To report such nets, please use the "-reportIgnoreNets" option of insertRepeaters
    2. There is no legal standard cell placement area available under long net wiring.
      Imagine that in your floorplan there is a long channel where you have hard placement blockage.
      insertRepeater will not be in a position to insert buffers.
      insertRepeater is not allower to make long detour to fix long nets.
      In such situation you must update your floorplan, you can add available std cell site (transform your hard placement blockage into soft placement blockage), or you add routing blockage to prevent router to use such long channel.

    Regards,

     Pat.

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