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ultra pcell with dbCreateParamInstByMasterName

bsrin

Hi All,

I am creating a ultra pcell consists of pch_fet cell (pcell) using dbCreateParamInstByMasterName. The pcell has "l" and "w" parameters. While Instantiating the ultra pcell with required l and w, it looks only l and w are changing. But, other parameters like dummies w and l are not changing. It seems the callbacks associated with l and w of pch_fet are not executed.

Can somebody tell me how to overcome this issue. How to get the callbacks associated l and w of basic pcell. 

 

Thanks,

bsrin 

  • Hi Bsrin

    You are correct, the callbacks do not get evaluated when creating a pcell instance. The callbacks are associated with the CDF which is bypassed when you use dbCreateParamInstByName. You have to find the callbacks and evaluate them in your code.

    Finding the instance CDF:

    instId = dbCreateParamInstByName( ... )

    cdfgData = cdfGetInstCDF( instId )

    Now you have a variable called cdfgData, in SKILL this is in scope of your callbacks.

    wParam = cdfFindParamByName( cdfgData "w" )

    when( wParam~>callback evalstring(wParam~>callback) )

    This should update the other parameter(s) on the instance as a side effect of the callback.

    Ted

  • Hi Bsrin,

    In addition to what Ted said, there are two functions that might help, vfoSetParam() and vfoSetParams()  which can set a CDF parameter (or multiple parameters, if using the second function) and trigger the callback(s) to run.

    Hopefully this will help you.

    Best regards,

    Lawrence.

  • Hi Ted/Lawrence,

    Sorry for the late reply,  I'm in vacation. 

    First of all, thanks for your detailed solution. Its working fine now.

    Thanks,

    bsrin.

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