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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
  • msharma

     Andrew,

     

    I posted the screenshots of the PCell creation on Flickr. You can see them here:

    http://www.flickr.com/photos/78766415@N02/with/7051464299/

     

    As for  your question:

    "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?"

     

    It seems the Cadence software passes the value assigned to width to the inherited PCell. I was able to verify that when using this hierarchical PCell, the width changes to the avlue assigned to each instance. It's when using the parameter width for repetition that the PCell breaks down.

     

    Thanks,

    Mohit

Reply
  • msharma

     Andrew,

     

    I posted the screenshots of the PCell creation on Flickr. You can see them here:

    http://www.flickr.com/photos/78766415@N02/with/7051464299/

     

    As for  your question:

    "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?"

     

    It seems the Cadence software passes the value assigned to width to the inherited PCell. I was able to verify that when using this hierarchical PCell, the width changes to the avlue assigned to each instance. It's when using the parameter width for repetition that the PCell breaks down.

     

    Thanks,

    Mohit

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