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update instance cdf properties after storeDefaults changed

annoyingGuy

Hi,

We changed our PDK to set storeDefaults=yes for all parameters.  This works fine for new schematics and instances that are manually touched.  We tried using a skill script to go through a design library and run the PDK callbacks to force the individual instances to now store the default values on each instance.  However.... not all the parameter values were store, only about half.  The half not stored is of course the more critical values we need stored!  Poking around in the documentation I found a command cdfUpdateInstParam.  This will imprint ALL cdf parameters onto the device... but... it uses the effective cell CDF with turns out to override a lot of the manually set parameters (like gate length, width, number of fingers, etc).  

Is there a command to imprint the instance with the current cdf property values, even the default ones?  In other words, most of the values are default and thus not previously stored (schematics and layouts created before storeDefaults changed to yes).  If the device is touched/tickled appropriately, it should get imprinted with all property values since they all now have storeDefaults changed to yet.  How do I do this?

using IC6.1.7-64b.500.17

Parents
  • Andrew Beckett

    As far as I know, there's no simple built-in function to do this. Calling the callbacks won't help, because this is nothing to do with the callbacks. It should be as simple as looking through all the CDF parameters in the CDF object, checking if any have storeDefault=yes, and dbFindProp on the instance doesn't return anything, and then doing a dbCreateProp to create the property with the default value on the instance.

    I'll write a function (and an article) to do this once I'm back from vacation next week.

    Regards,

    Andrew.

  • annoyingGuy
    in reply to Andrew Beckett

    I was able to look these two functions up in the documentation (dbFindProp and dbCreateProp) and write a script that worked.  Although, it is very inefficient and slow.  I Look forward to seeing your script after you enjoy your vacation.  Thanks.

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  • annoyingGuy
    in reply to Andrew Beckett

    I was able to look these two functions up in the documentation (dbFindProp and dbCreateProp) and write a script that worked.  Although, it is very inefficient and slow.  I Look forward to seeing your script after you enjoy your vacation.  Thanks.

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