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Hierarchical Flow

ErezBS

Hi,

I have placed & routed design, and i want to import it to my top level.

i would like to know what is the recommended flow for hierarchical flow?

Thanks! 

  • Scrivner

    You can export the design as DEF or GDS. Then import the DEF or GDS into a library. From your top level layout place the top level of your place&route as an instance into your top level.

  • ErezBS

    DEF only gives me physical information, what about timing information?

    How , do you recommend the ILM flow?

  • Scrivner

    You need to look at the herarchical partitioning flow. For doing hierarchical P&R the top level needs to be partitioned into sub-blocks. A separate work area directory is created for each sub-block. The sub-blocks are placed&routed independently and a timing model (ILM or .lib) needs to be created. When the sub-blocks are completed, there are imported back into top level with all information including timing and DEF.

    I've attached a Cadence app noteon the subject. It's a few years old so some details may be different but I think the general flow is the same.

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