Design compiler set_timing_derate

  • What is derate in timing?

    Timing derating means adding an extra margin to STA analysis to accommodate variation in timing parameters of gates (as they were characterized in a timing library).
    Timing libraries are characterized for a particular operating condition representing a combination of process, voltage and temperature (a PVT for short)..

  • What is derating factor in physical design?

    Derating factors are the coefficients that are used to adjust the timing model to account for the variations in the process, voltage, and temperature (PVT) of the circuit.
    Derating factors can be applied to the delays, the constraints, or both..

  • What is the Set_timing_derate command?

    set_timing_derate is a command that lets you constraint the timing.
    Forget the process variation and OCV for now and let's uncomplicate and first see how the command works.
    Timing derate numbers are ratios used to derate(increase/decrease) the delay numbers you get in your timing reports.Jul 9, 2013.

  • What is the Set_timing_derate command?

    set_timing_derate is a command that lets you constraint the timing.
    Forget the process variation and OCV for now and let's uncomplicate and first see how the command works.
    Timing derate numbers are ratios used to derate(increase/decrease) the delay numbers you get in your timing reports..

  • Derating factors are the coefficients that are used to adjust the timing model to account for the variations in the process, voltage, and temperature (PVT) of the circuit.
    Derating factors can be applied to the delays, the constraints, or both.
  • In OCV a fixed timing derate factor is applied to the delay of all the cells present in the design so that in case of process variation affects the delay of any cells during the fabrication, it will not affect the timing requirements and the chip will not fail after fabrication.
Hello, Can one explain how set_timing_derate command in DC/PT will effect the design? Why this command is used while doing timing analysis?
The process variations means that say u have two similar AND gates in ur design placed at diff places. Then ideally it should have same delay right. But due to 

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