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 Synthesis in rclabs using slow and fast library 

Last post Sun, Nov 11 2012 11:38 AM by grasshopper. 3 replies.
Started by Maheshnb 02 Nov 2012 11:19 PM. Topic has 3 replies.
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  • Fri, Nov 2 2012 11:19 PM

    • Maheshnb
    • Not Ranked
    • Joined on Thu, Nov 1 2012
    • Posts 5
    • Points 85
    Synthesis in rclabs using slow and fast library Reply

    Hi good morning all,

                            i have written a code for inverter chain and synthesized using slow and fast lib sepaerately,which represents slow path and fast path helpful in timing analysis.

    problem is how can i use this fast lib and slow lib together so that me inverter chain should select perticilar cells from slow lib for slow path and perticular cells from fast lib for fastpath simulataneously..............

    please reply.........i need it urgently........

    mahesh

    9739436239
    • Post Points: 20

  • Mon, Nov 5 2012 3:36 AM

    • grasshopper
    • Top 25 Contributor
    • Joined on Thu, Jul 17 2008
    • Chelmsford, MA
    • Posts 202
    • Points 2,605
    Re: Synthesis in rclabs using slow and fast library Reply

     Hi Mahesh,

     The scenario you are describing is unrealistic on the same design. slow and fast cells are not just different process but also different operating conditions so one library would end up extrapolated to the other's operating conditions which is likely not what you want since fast would not be fast at that point or similar if slow was extrapolated. However, if your libraries are indeed characterized to same operating condition but only process is differenet, then you can simply do

     

    set_attr library {slow.lib fast.lib} /

     

    as documented in the attribute reference and the user guide.

    hope this helps,

    gh-

    • Post Points: 20

  • Fri, Nov 9 2012 9:34 PM

    • Maheshnb
    • Not Ranked
    • Joined on Thu, Nov 1 2012
    • Posts 5
    • Points 85
    Re: Synthesis in rclabs using slow and fast library Reply

     Dear sir,

              I tried with that command it ends up with error. can u please provide me the cadence RC labs synthesis commands.

    Thank u

    • Post Points: 20

  • Sun, Nov 11 2012 11:38 AM

    • grasshopper
    • Top 25 Contributor
    • Joined on Thu, Jul 17 2008
    • Chelmsford, MA
    • Posts 202
    • Points 2,605
    Re: Synthesis in rclabs using slow and fast library Reply

     Hi Maheshnb,

     the commands works fine when I try it. Without any more information it is impossible to tell what the problem may be. I am assuming you are not using slow.lib and fast.lib but the appropriate file names for the libraries.

     

    gh-

    • Post Points: 5
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Started by Maheshnb at 02 Nov 2012 11:19 PM. Topic has 3 replies.