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Variable multiplicity factor("m") for different instances of the same cellview in Cadence Virtuoso

Saumeek

I want to make the multiplicity factor ("m") of the Finfet of the PDK we use, a variable so that for the same cell view, I can choose the "m" factor a different number, for different instances (eg. different "m" for each nfet of different nand gate instances in the same schematic).

I encounter the following error while using pPar()

*WARNING* parameter m [Multiplicity] @ newlib/nand/schematic/<New Inst>:
evaluated expression: (pPar("m1")) -> pPar("m1").
*WARNING* Multiplicity is non-constant!!. Please enter interger value

May I please have help.

  • Almost certainly this is that the CDF callbacks for this component (provided by the foundry who own the PDK) don't support expressions/parameters for this parameter. The message has a typo in (integer misspelt, and a double exclamation mark - so it doesn't look like something coming from Cadence code). You should contact the foundry about this.

    If you're doing this to allow sweeping of the dimensions in ADE, you can use the Variables and Parameters assistant to use the parameterisation capability (including ratio-matched parameters to allow related parameters to be swept together) but if you're just wanting to have a parameterizable nand gate, this is not going to help you.

    Andrew

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