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 Cell Delay 

Last post Thu, Mar 15 2012 9:46 PM by akshayd1. 2 replies.
Started by akshayd1 15 Mar 2012 01:56 AM. Topic has 2 replies and 2292 views
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  • Thu, Mar 15 2012 1:56 AM

    • akshayd1
    • Not Ranked
    • Joined on Thu, Mar 15 2012
    • Posts 2
    • Points 25
    Cell Delay Reply

     In ETS I am getting the same cell delay for a cell BUF when I the design is set at 25C and 110C. Ideally I should see the delay increase. I saw the cell in the exactly same path in both the designs. What could be the explanation?

    • Post Points: 20
  • Thu, Mar 15 2012 8:03 AM

    • wally1
    • Top 50 Contributor
    • Joined on Mon, Aug 4 2008
    • Bellevue, WA
    • Posts 149
    • Points 2,915
    Re: Cell Delay Reply

    Make sure your timing library has k-factors defined so the tool knows how timing should be scaled based on PVT. For example, the timing constraint equation for setup rise is.


    rise_constraint * (1 + delta_voltage * k_volt_setup_rise)
    * (1 + delta_temp * k_temp_setup_rise)
    * (1 + delta_process * k_process_setup_rise)

    Hope this helps!

    - Brian

    • Post Points: 20
  • Thu, Mar 15 2012 9:46 PM

    • akshayd1
    • Not Ranked
    • Joined on Thu, Mar 15 2012
    • Posts 2
    • Points 25
    Re: Cell Delay Reply

    I have done temprature scaling and am seeing the the effects of temprature scaling in the total delay, but for one or two cells in the path the delay is not increasing at all.

    • Post Points: 5
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Started by akshayd1 at 15 Mar 2012 01:56 AM. Topic has 2 replies.