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Virtuoso Warning: The inline subckt definition 'ndio_3' does not contain any inline components

Teem

Dear,

There is always below warning messages when I run simulation, like simple DC simulation on inverter. Could anyone tell me the cause of such warning and how to solve it?

Cadence version is: 5.10.41.500.6.144

Sorry that I can not paste the warning in text because my server restricts the privilege from exporting the files.

Best regards,

Teem

Parents

  • You can ignore this. It means that in the model files the foundry has used the inline construct with a subckt model, but not defined an inline device. The whole point of an inline subckt is to allow you to use:

    inline subckt mynch (D G S B)
    parameters w=1u l=1u
    mynch (D G S B) nch w=w l=l
    ends mynch

    The red names should be the same - the subckt name and the instance name within the subckt. If you do this, any results for that device get output without an additional level of hierarchy and so it makes annotation of results and various other things a lot cleaner and simpler. If you don't have an instance within the inline subckt with a name that matches the subckt name, you get this warning - essentially it means it's pointless making it an inline subckt - it will behave just as an ordinary subckt would.

    I recall in some older technologies that foundry did this mistakenly. It should be possible to suppress the warning by including a file containing:

    myopts options warning_limit=0 warning_id=["SFE-2296"]

    before you include the model file. Whether it's worth the bother is another matter...

    Regards,

    Andrew.

Reply

  • You can ignore this. It means that in the model files the foundry has used the inline construct with a subckt model, but not defined an inline device. The whole point of an inline subckt is to allow you to use:

    inline subckt mynch (D G S B)
    parameters w=1u l=1u
    mynch (D G S B) nch w=w l=l
    ends mynch

    The red names should be the same - the subckt name and the instance name within the subckt. If you do this, any results for that device get output without an additional level of hierarchy and so it makes annotation of results and various other things a lot cleaner and simpler. If you don't have an instance within the inline subckt with a name that matches the subckt name, you get this warning - essentially it means it's pointless making it an inline subckt - it will behave just as an ordinary subckt would.

    I recall in some older technologies that foundry did this mistakenly. It should be possible to suppress the warning by including a file containing:

    myopts options warning_limit=0 warning_id=["SFE-2296"]

    before you include the model file. Whether it's worth the bother is another matter...

    Regards,

    Andrew.

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