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How to add variable in model files?

There is some perimeter in model file which I want to access as a variable and can easily edit from design variable option. Can you please help me on that about how to add variables in model file?

For eg:-

The above picture is small section of a model file. There is a parameter "k" which I want to access as a variable in Design Variable of ADE Explorer or anywhere else, so that I can easily sweep the parameter. Can you please help me on it?

Andrew Beckett over 4 years ago

Use the method in this post (which you just posted in). Then you can add a variable in ADE k and it will override the value in the model file.

Andrew
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Firdos over 4 years ago in reply to Andrew Beckett

I have tried the steps that you have given.

But it is showing error during simulation. Value of k is not able to pass to the model file.
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Andrew Beckett over 4 years ago in reply to Firdos

And what was the error? This kind of information is rather helpful for diagnosing what's wrong...
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Firdos over 4 years ago in reply to Andrew Beckett

Actually, .cdsinit file is in read only mode and I am not able to edit this file.
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Andrew Beckett over 4 years ago in reply to Firdos

Well, I'm sure somebody at your end can help resolve that - either there's another file that you can edit that is loaded by the .cdsinit, or that policy should be relaxed. It's pretty rare to disallow user customisations completely.

Another approach could be to put this entry:

spectre.envOpts netlistModelFileFirst boolean t

into ~/.cdsenv (i.e. the .cdsenv file in your home directory). Hopefully that's not readonly too (and if it is, presumably it's owned by you, so you could change that?)

Andrew
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Firdos over 4 years ago in reply to Andrew Beckett

I have add the entry in my .cdsenv file, but during simulation, it is showing error " Cannot run the simulation because parameter 'k' has been used but no value has been assigned to it.

Above picture is of my model file.

Above is the picture of cdsenv file.

Above is the picture of design variable in ADE Explorer
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Andrew Beckett over 4 years ago in reply to Firdos

OK, that's because of an error in your model file - when you first showed it, you had k=0.2 but now you've removed the 0.2. So it's unsurprising that this fails - you've created a syntax error by removing the value.

You either need to leave a default value k=0.2 in the parameters statement (and use the redefinedparams switch I show in the other article) or remove the parameter k altogether from the parameters statement (in which case only the value used by ADE will be netlisted).

Regards,

Andrew
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Firdos over 4 years ago in reply to Andrew Beckett

It's working now.

Thank you very much.
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