Interconnect-Driven Physical Synthesis Using Persistent Virtual Routing

  • US 20090319977A1
  • Filed: 06/24/2008
  • Published: 12/24/2009
  • Est. Priority Date: 06/24/2008
  • Status: Active Grant
First Claim
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1. A method of performing interconnect-driven physical synthesis, the method comprising:

  • performing placement for a design;

    performing post-placement optimization based on the placement;

    selecting persistent nets of the design based on unpredictability and expected quality-of-result impact;

    generating routes for the persistent nets;

    extracting parasitics and delays for the persistent nets using the generated routes;

    performing synthesis by maintaining and updating the routes for the persistent nets across subsequent placement-based optimization steps while using the extracted parasitics and delays to drive the synthesis;

    performing routing for the remaining nets in the design while guaranteeing the existing routes for the persistent nets;

    performing optional post-routing optimization based on the routing; and

    outputting a final layout of the design based on the post-route optimization.

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