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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

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  • Andrew Beckett

    Mohit,

    Well, it works for me - so I assume you must be doing something wrong. Have you set up the instance of the pdk pcell to have an inherited parameter using Pcell->Inherited Parameters? I just did that, and assigned my instance to inherit from a parameter called "width" and then also used width in my repetition expression - and also used Parameters->Edit to set the default value of width.

    From what you describe you're expecting the parent pcell to inherit from the child instance, which doesn't make sense - how would the child pcell know what values to use?

    If this doesn't help, I think you're going to have to post some pictures and a more detailed explanation, or contact customer support.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Mohit,

    Well, it works for me - so I assume you must be doing something wrong. Have you set up the instance of the pdk pcell to have an inherited parameter using Pcell->Inherited Parameters? I just did that, and assigned my instance to inherit from a parameter called "width" and then also used width in my repetition expression - and also used Parameters->Edit to set the default value of width.

    From what you describe you're expecting the parent pcell to inherit from the child instance, which doesn't make sense - how would the child pcell know what values to use?

    If this doesn't help, I think you're going to have to post some pictures and a more detailed explanation, or contact customer support.

    Regards,

    Andrew.

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