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

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.

Dear Andrew:

Thanks for your always precise and clear reply.

I tried your suggestion to suppress the warning. My procedures are as follows:

1. Inserting one line of texts "INCLUDE ./warningSuppression" as the first line in cds.lib in working directory.

2. Creating file warningSuppression in working directory which contents are the same as you suggested.

3. Restart icms and simulate.

But the warning appears again. Could you help point out where I did wrong?

Thank you very much.

Best regards,

Teem

Why are you adding an include statement to the cds.lib? This is a directive for the simulator, not the definition of a library for virtuoso.

You need to add the file (which should have a .scs suffix ideally to ensure that it gets interpreted in spectre syntax; the alternative is to precede the line with "simulator lang=spectre") via Setup->Model Libraries in ADE, and ensure that it appears before the model files which are incorrectly defined.

Personally I would just ignore the warning message rather than going to this bother.

Andrew.

The option that Andrew mentioned needs to be in the Spectre netlist, not in the cds.lib file.  You could include it before the model files in the Model Libraries setup form in ADE or as 'include "/path/to/warningSuppression"' if you are running spectre standalone.

Thanks very much for Andrew and Tom's explanation. I fully got it now.

Best regards,

Teem.