Spectre netlisting alter model name

Discussion in 'Cadence' started by Bernd Fischer, Oct 20, 2006.

  1. Hi,

    I'm wondering if there is a way to tell
    the spectre netlister to use a alternative model
    name rahter then the default one.

    The objective is to use a second model for several
    primitive devices in special simulations.

    I could go through the design hierarchy with SKILL
    and change the model name. But if there is a write
    protected cell in the hierarchy I have to make a local
    copy of all the cells down to the write protected one and
    reorganize the references.
    This is some effort for the designer and I'm afraid this
    will end up in a mess of the design hierarchy.

    So I'm looking for a way now to tell the netlisting
    process to use alternative models.

    Any ideas are welcome, thanks
    Bernd Fischer, Oct 20, 2006
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  2. Bernd Fischer

    uli Guest

    You could create an additional view parallel to your
    primitive's symbol, something like a "schematic", with
    a viewname that is not in the switch-list.
    Inside that schematic you place a symbol, which by
    default uses your special model. Then you can use
    hierarchy editor to decide which view (model) to use.
    I did not test this, it is just an idea.
    Unfortunately you need to go down one more stage in
    hierarchy to inspect the backannotated parameters of
    your device after simulation.

    uli, Oct 27, 2006
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  3. Hi Bernd,

    You might be able to do this with view-specific CDF (this is a bit of a stab in
    the dark, without having tested it).

    If you have a second stopping view, you can add view specific CDF for a view
    with that name - and change the model name in that view specific CDF.
    From memory, this is covered by the SKILL function almSetModuleName - check
    in the docs around this function.

    Then you could use the hierarchy editor to switch views for the instances you

    If I have a moment today, I'll try this out.

    If you want to do this for all transistors, then you're better off defining a
    different model with the same name, and including that instead.


    Andrew Beckett, Oct 31, 2006
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