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OCV mode optimization in encounter

MadhuNS

Hi All,

Its been a general practise with our BE folks to use BCWC mode with some derate and dubb it as "equivalent" to OCV mode.

Its been a nighmarish to close design via ECO since timing engines using true OCV modes show much skewed timing when compared with encounters native timer.

Is there an OCV mode in encounter ? Since I'am novice wrt encounter grapevine says that since two libraries are required for OCV mode its not recommended,

which brings me to the next point has any one figured out a way to derate ECSM/NLDM library and use the derated library as the second library required by OCV.

Parents

  •  It is rare that we actually get OCV libs, so I think what you are looking for is the set_timing_derate command. For example, if we want 5% OCV, we would use something like this:

    set_timing_derate -early 0.95 -late 1.00 -delay_corner ss_125c_cmax_125c
    set_timing_derate -early 1.00 -late 1.05 -delay_corner ff_m55c_cmin_m55c

    (The -delay_corner option is part of the MMMC setup which Bob has already recommended to you.) Please check the docs for all the available options of set_timing_derate to make sure you are derating exactly the way you want to.

    - Kari 

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  •  It is rare that we actually get OCV libs, so I think what you are looking for is the set_timing_derate command. For example, if we want 5% OCV, we would use something like this:

    set_timing_derate -early 0.95 -late 1.00 -delay_corner ss_125c_cmax_125c
    set_timing_derate -early 1.00 -late 1.05 -delay_corner ff_m55c_cmin_m55c

    (The -delay_corner option is part of the MMMC setup which Bob has already recommended to you.) Please check the docs for all the available options of set_timing_derate to make sure you are derating exactly the way you want to.

    - Kari 

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