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Parameterized Instance Array in Schematic

fortune100worse

Hi,

How can one set the length of an instance array as a parameter in Virtuoso schematic? 

If instance array is thearray<4:1> it instantiates 4 instances but how can one set the "4" as a parameter say "Length"?

Thanks for any feedback!

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  • Andrew Beckett

    This is not possible in the schematic editor. The only way it could be achieved is to create the schematic as a parameterised cell (a PCell), i.e. writing SKILL to automatically generate the schematics from a parameter.

    Regards,

    Andrew.

  • fortune100worse
    in reply to Andrew Beckett

    Thanks for your reply. 

    Why can't this be done by thearray<VAR("Length"):1>? Assuming "Length: is a variable in the simulation.

  • Andrew Beckett
    in reply to fortune100worse

    Because you can't... if you had been able to do that, I'd have suggested it. By all means try if you don't believe me!

    1. The connectivity in the schematic is created when you create the schematic, not at netlisting time (for efficiency) - actually at "check" time.
    2. Parameterisation of bus widths is not supported in the OpenAccess database
    3. The VAR() syntax never gets used on the schematic anyway

    Andrew

  • fortune100worse
    in reply to Andrew Beckett

    Thanks for your insights.

    Can it be done maybe by adding a "MULT" property to the CDF of thearray? 

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  • fortune100worse
    in reply to Andrew Beckett

    Thanks for your insights.

    Can it be done maybe by adding a "MULT" property to the CDF of thearray? 

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