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I would like to see the values of a signal after some mathematical/logical function. How do I do this?

Looking for a way to run a TCL procedure over all values of a signal, and if possible display these values in the wave on another "virtual" signal.

For example:

I would like to do the following transformation

limit_values = [0, 50, 100, 300, 400]

signal_values = [20, 60, 90, 220, 5000]

after transformation:

new_values = [0, 50, 50, 100, 400]

Basically finding the nearest lowest value to the signal value in the limit_values table.

StephenH over 3 years ago

You probably want the expression calculator for this, as it lets you define a Tcl expression to compute a new signal derived from one or more other signals: https://support.cadence.com/apex/techpubDocViewerPage?xmlName=expressioncalculator.xml&title=SimVision:%20Using%20the%20Expression%20Calculator%20--%20Contents%20-%20&hash=&c_version=21.03&path=ExpressionCalculator/ExpressionCalculator21.03/ExpressionCalculatorTOC.html

There is also a cheat-sheet for the expression syntax here:

https://support.cadence.com/apex/techpubDocViewerPage?path=expression_qrg/expression_qrg21.03/expression_qrgTOC.html

To build a look-up table per your request, I think the simplest thing would be to build a tree of ternary expressions, something like:

(mysig < 50) ? 0 : (mysig < 100) ? 50 : (mysig < 300) ? 100 : (mysig < 400) ? 300 : 400
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