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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

  • Anand,

    I thought I'd answered this, but having checked I don't see my reply here (must have had a senior moment!). Anyway, where are you seeing this parameter "sdMtlWidth"? How do you know there's a parameter called that? This is very specific to the technology/pcell you're using, so I can't really answer it from the description you've given without some more detail as to how you know this parameter exists. Maybe some pictures would help?

    As for the code problem, it sounds as if it's been incorrectly copied and pasted. There's a bit of a problem with the forums at the moment that copy and paste of code loses the formatting (I have IT looking into it). The workaround is to use a web browser on Linux (e.g. firefox) and rather than doing an explicit "copy" and "paste", select the text with the mouse and then use the middle mouse button to paste into your editor (on Linux). Hopefully then you won't mess up the brackets (that sounds as if what must have happened). That said, copying and pasting the code you posted above didn't have that problem - it suggests you have the parentheses in the wrong place somehow though.

    Regards,

    Andrew.

Reply

  • Anand,

    I thought I'd answered this, but having checked I don't see my reply here (must have had a senior moment!). Anyway, where are you seeing this parameter "sdMtlWidth"? How do you know there's a parameter called that? This is very specific to the technology/pcell you're using, so I can't really answer it from the description you've given without some more detail as to how you know this parameter exists. Maybe some pictures would help?

    As for the code problem, it sounds as if it's been incorrectly copied and pasted. There's a bit of a problem with the forums at the moment that copy and paste of code loses the formatting (I have IT looking into it). The workaround is to use a web browser on Linux (e.g. firefox) and rather than doing an explicit "copy" and "paste", select the text with the mouse and then use the middle mouse button to paste into your editor (on Linux). Hopefully then you won't mess up the brackets (that sounds as if what must have happened). That said, copying and pasting the code you posted above didn't have that problem - it suggests you have the parentheses in the wrong place somehow though.

    Regards,

    Andrew.

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