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Using Inherited Parameters in PCells

msharma

 Friends,

 I am creating a custom pcell, through the graphical layout method. The custom pcell layout contains an instance of a pdk pcell. I have inherited a parameter 'width' among others from the pdk pcell to my custom pcell. In my custom pcell, I need to repeat contacts based on the value of width. But, it is not possible to use parameter 'width' in repetition expressions. The software gets confused, and assigns 'width' as a new parameter.

 

Do you know how to reference the inherited 'width' parameter in my custom pcell, without confusing the software? Any responses are appreciated.

 

Thanks,

Mohit

Parents
  • Andrew Beckett

    Mohit,

    From looking at your pictures, it's failing because when the instantiation of the child pcell is happening, it is expecting a string, not a float - although the error message appears to say that it's expecting 2e-12 (not sure why that is). I see that the length is being passed as a string - so I'd have expected the width to be the same type. 

    So my guess (without seeing the actual data) is that you should change the type of width to be a string, and then make your stepping distance in the repetitions equal to cdfParseFloatString(width)/2 .

    If this doesn't help - I'd suggest going via customer support - this kind of thing is much easier if we can see the actual data. As a colleague of mine used to say - "a picture is worth a thousand words, but a database is worth a million"

    Regards,

    Andrew. 

Reply
  • Andrew Beckett

    Mohit,

    From looking at your pictures, it's failing because when the instantiation of the child pcell is happening, it is expecting a string, not a float - although the error message appears to say that it's expecting 2e-12 (not sure why that is). I see that the length is being passed as a string - so I'd have expected the width to be the same type. 

    So my guess (without seeing the actual data) is that you should change the type of width to be a string, and then make your stepping distance in the repetitions equal to cdfParseFloatString(width)/2 .

    If this doesn't help - I'd suggest going via customer support - this kind of thing is much easier if we can see the actual data. As a colleague of mine used to say - "a picture is worth a thousand words, but a database is worth a million"

    Regards,

    Andrew. 

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