post-layout STA with PT

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steven852

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I am having this timing problem and seek suggestions:

The pre-layout synthesis met all the timing. The layout tool (Encounter) had timing violations with wire model. The wire model used was not accurate enough so a post-layout timing analysis with PT (RC extraction with Star RC, SDC files, and routed netlist) was carried on. The post-layout timing analysis also not met. I don't know what step to work on to resolve this problem.

Anyone has suggestions?

Thanks.
 

Refloorplan, even resynthesis with proper wire load model and other constraints.
 

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