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Spectre Simualtion errors (premature failure)

superman321
Im trying to simulate a simple Inverter with a spectre (version 5.1 ) and I have the following error messages: input.scs: (transistor nmos) T0 is an instance of an undefined model subcircuit. and similar error on the PMOS transitor too. Although, the same circuit was working fine a few days a ago. It has stopped suddenly with the above error messages. any help will be kindly appreciated. thanks
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  • You could, although that's exactly the same as it not being set. Digital mode means that netlisting is expected to be "NLP" rather than "CDF" based (it's for historical reasons).

    The practical consequence of this is that default values are not picked up from the CDF when in Digital mode; consequently if any instance's parameter values are at default, it doesn't look at the default value from the CDF, and just assumes it's not set. So what happens is that the "model" parameter (which is usually the default value, and not stored actually on the instance) gets omitted, and it falls back to printing "subcircuit" instead.

    So you don't want to be using Digital mode ;-)

    Regards,

    Andrew.

Reply

  • You could, although that's exactly the same as it not being set. Digital mode means that netlisting is expected to be "NLP" rather than "CDF" based (it's for historical reasons).

    The practical consequence of this is that default values are not picked up from the CDF when in Digital mode; consequently if any instance's parameter values are at default, it doesn't look at the default value from the CDF, and just assumes it's not set. So what happens is that the "model" parameter (which is usually the default value, and not stored actually on the instance) gets omitted, and it falls back to printing "subcircuit" instead.

    So you don't want to be using Digital mode ;-)

    Regards,

    Andrew.

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