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Parameter Arrays in Cadence Schematic

gokce

Hi,

 I am using icfb ic-5.1.14, and I have a question about adding parameters in a symbol array in schematic. For example, I have an instance array I<1:2> , and each instance has a parameter called length. I want to give the first instance a length parameter of "5", the second one "6". Is there a way to do that? I tried typing "5,6" in the parameter field in the symbol, but that did not work. I will have an array in the hundreds in the future, soI do not want to create a different symbol for each one andedit by hand.

 Thanks,

Gokce

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  • Gokce,

    There is no interactive way of doing this. There's no syntax for specifying a list of values over an iterated set, nor an access function to look up the iteration in an expression (although there's an enhancement request for just that).

    Right now, the only real method is to create a schematic pcell (with SKILL) which would allow you to effectively build an array of parallel components, and could inherit a parameter from the instance above, and split on (say) a comma.

    So effectively you could create an iterator component to do this. Not trivial, but not impossible either.

    Alternatively the Cadence services organisation in Japan has a solution for doing things like this, I believe. Contact your account manager if you're interested.

    Regards,

    Andrew
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  • Gokce,

    There is no interactive way of doing this. There's no syntax for specifying a list of values over an iterated set, nor an access function to look up the iteration in an expression (although there's an enhancement request for just that).

    Right now, the only real method is to create a schematic pcell (with SKILL) which would allow you to effectively build an array of parallel components, and could inherit a parameter from the instance above, and split on (say) a comma.

    So effectively you could create an iterator component to do this. Not trivial, but not impossible either.

    Alternatively the Cadence services organisation in Japan has a solution for doing things like this, I believe. Contact your account manager if you're interested.

    Regards,

    Andrew
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