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Initializing pcell parameters using pcell parameters

ssarik

Hi,

Is there any way I can initialize a pcell parameter using another pcell parameter defined earlier.

For example:

Lets say getMinWidth(metalLayer) is a function which returns thee minimum width of the metal_layer.

Now I want to define the pcell parametes as

(metalLayer string "metal1") ;; Parameter 1

(metalWidth float getMinWidth(metalLayer) ;; Parameter 2

Using this I need metalWidth to always be the minimum width of the metal layer passed in the parameter metalLayer.

What is the most elegant way to achive this?

Parents

  • If you always want it to be the minimum width passed in, don't define it as a PCell parameter at all - just define a local variable in your PCell code and assign it to be the result of your function.

    If you want the ability to override it, then you should have some dummy value (e.g. -1) which means "auto-compute" and then you can do inside your code:

    (metalWidth float -1) ;; parameter 2

    ; in the body itself:
    unless(plusp(metalWidth)
      metalWidth=getMinWidth(metalLayer)
    )

    Regards,

    Andrew

Reply

  • If you always want it to be the minimum width passed in, don't define it as a PCell parameter at all - just define a local variable in your PCell code and assign it to be the result of your function.

    If you want the ability to override it, then you should have some dummy value (e.g. -1) which means "auto-compute" and then you can do inside your code:

    (metalWidth float -1) ;; parameter 2

    ; in the body itself:
    unless(plusp(metalWidth)
      metalWidth=getMinWidth(metalLayer)
    )

    Regards,

    Andrew

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