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can not add filler between some standard cell

quiet over 12 years ago

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.

Scrivner over 12 years ago

If you routed before placing fill cells, there may be routing in the gaps that prevent the fillers from being placed.
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quiet over 12 years ago

Yes, but if I add fillers before routing, won't it prevent the optimization for the timing?
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Scrivner over 12 years ago

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.
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