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How to use a design variable inside value()?

yayla

 Hi everyone,

 I want to use one of the design variable inside value() for histogram bin but I couldn't achieve. I have looked ocean and skill references and this is my final point:

 desVar("fin" 1G)

 value(db(v("/out" ?result "pss_fd") (evalstring(desVar("fin"))/8*3) ?histoDisplay nil ?noOfHistoBins 1)

 

but I couldn't get any. When I changed evalstring() part to a number, it works. Do you know how I can solve this problem?

 

Thanks,

yayla

 

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  • Yayla,

    You will still need to define the variable using desVar(), and then vary it using paramAnalysis(). The VAR() will pick up the value used in the simulation itself. Put another way, the desVar() defines the variable before the simulation is run, and the VAR() function refers to the value from the simulation itself.

    If doing a parametric sweep, you may then find that VAR() is returning a waveform - depending on the version you have, this might cause a problem when used as the interpolation value of the value() function - but try it and see. I think that was fixed some time ago (there's a workaround using famMap() if it doesn't).

    Andrew.

Reply

  • Yayla,

    You will still need to define the variable using desVar(), and then vary it using paramAnalysis(). The VAR() will pick up the value used in the simulation itself. Put another way, the desVar() defines the variable before the simulation is run, and the VAR() function refers to the value from the simulation itself.

    If doing a parametric sweep, you may then find that VAR() is returning a waveform - depending on the version you have, this might cause a problem when used as the interpolation value of the value() function - but try it and see. I think that was fixed some time ago (there's a workaround using famMap() if it doesn't).

    Andrew.

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