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Modified parameters don't change layout pcells

egolowen

Hi,

I am writing SKILL code in order to modify the parameters of layout instances, however even though the parameter has been properly modified, the layout pcell does not change (for example, if I increase the length of an nfet the property is the correct value but the layout instance remains the same size).

 I have tried using:
  foreach(prop properties
... 
prop~>value = param_value
...
)

and:
 dbReplaceProp(inst prop~>name 'string param_value)

But neither have fixed the issue.
Is there a better may to modify these parameters so the layout itself is updated properly? I was thinking of trying to use a replay file but that may not do the trick.

Thanks,
Elizabeth

Parents

  • Hi Elizabeth,

    The only explanation can be that you're not actually changing the pcell parameters. Maybe you have two sets of parameters - one that is used for the edit properties form, and one which is used for pcells, which are set via CDF callbacks, maybe?

    You could try calling code such as abInvokeCdfCallbacks or CCSinvokeCdfCallbacks (search on the forum or support.cadence.com for these), or you could check what the pcell parameters are actually called. To do this, select the instance in question and type:

    car(geGetSelSet())~>master~>superMaster~>parameters~>value~>name

    This will give you the names of all the pcell parameters for the device you have selected.

    Regards,

    Andrew.

Reply

  • Hi Elizabeth,

    The only explanation can be that you're not actually changing the pcell parameters. Maybe you have two sets of parameters - one that is used for the edit properties form, and one which is used for pcells, which are set via CDF callbacks, maybe?

    You could try calling code such as abInvokeCdfCallbacks or CCSinvokeCdfCallbacks (search on the forum or support.cadence.com for these), or you could check what the pcell parameters are actually called. To do this, select the instance in question and type:

    car(geGetSelSet())~>master~>superMaster~>parameters~>value~>name

    This will give you the names of all the pcell parameters for the device you have selected.

    Regards,

    Andrew.

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