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 Hierarchical Flow 

Last post Tue, Nov 6 2012 8:56 AM by ErezBS. 4 replies.
Started by ErezBS 05 Nov 2012 04:18 PM. Topic has 4 replies and 1109 views
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  • Mon, Nov 5 2012 4:18 PM

    • ErezBS
    • Top 500 Contributor
    • Joined on Mon, Nov 5 2012
    • Posts 29
    • Points 400
    Hierarchical Flow Reply

    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! 

    • Post Points: 20
  • Mon, Nov 5 2012 4:33 PM

    • Scrivner
    • Top 100 Contributor
    • Joined on Thu, Oct 9 2008
    • Ridgeland, MS
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    Re: Hierarchical Flow Reply

    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.

    • Post Points: 20
  • Mon, Nov 5 2012 9:25 PM

    • ErezBS
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    • Joined on Mon, Nov 5 2012
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    Re: Hierarchical Flow Reply

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

    How , do you recommend the ILM flow?

    • Post Points: 20
  • Tue, Nov 6 2012 8:33 AM

    • Scrivner
    • Top 100 Contributor
    • Joined on Thu, Oct 9 2008
    • Ridgeland, MS
    • Posts 75
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    Re: Hierarchical Flow Reply

    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.

    • Post Points: 20
  • Tue, Nov 6 2012 8:56 AM

    • ErezBS
    • Top 500 Contributor
    • Joined on Mon, Nov 5 2012
    • Posts 29
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    Re: Hierarchical Flow Reply

    Thanks.

    I will try this. 

    • Post Points: 5
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Started by ErezBS at 05 Nov 2012 04:18 PM. Topic has 4 replies.