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 can not add filler between some standard cell 

Last post Mon, Nov 26 2012 9:57 AM by Scrivner. 3 replies.
Started by quiet 26 Nov 2012 06:36 AM. Topic has 3 replies and 1086 views
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  • Mon, Nov 26 2012 6:36 AM

    • quiet
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    • Joined on Mon, Aug 6 2012
    • Posts 13
    • Points 215
    can not add filler between some standard cell Reply

    When I try to add fillers in my design, there are some gaps between standard cells that can not add fillers into.

    What may be the problems?

    Thanks.

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    • Post Points: 20
  • Mon, Nov 26 2012 7:53 AM

    • Scrivner
    • Top 100 Contributor
    • Joined on Thu, Oct 9 2008
    • Ridgeland, MS
    • Posts 75
    • Points 1,475
    Re: can not add filler between some standard cell Reply

    If you routed before placing fill cells, there may be routing in the gaps that prevent the fillers from being placed.

    • Post Points: 20
  • Mon, Nov 26 2012 8:14 AM

    • quiet
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    • Posts 13
    • Points 215
    Re: can not add filler between some standard cell Reply
    Yes, but if I add fillers before routing, won't it prevent the optimization for the timing?
    • Post Points: 20
  • Mon, Nov 26 2012 9:57 AM

    • Scrivner
    • Top 100 Contributor
    • Joined on Thu, Oct 9 2008
    • Ridgeland, MS
    • Posts 75
    • Points 1,475
    Re: can not add filler between some standard cell Reply

    The normal flow is to perform timing optimization, place fillers and then route. If there are timing violations post-route, you remove the fillers, perform timing-opt again, place fillers again, and then do an eco-route. If you use the command setFillerMode to define the fill cells and some other filler behavior, the removal and replacement of fillers is done automatically when running optDesign -postRoute.

    • Post Points: 5
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Started by quiet at 26 Nov 2012 06:36 AM. Topic has 3 replies.