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Annotate symbol with design variables

ritterp

Hello,

I would like to add a label (by means of ILLabel guess) to the symbol whose value depends on global design variables. Let's imagine we had a symbol for a transmissionline segment consisting of a cap with value Par("C") and an inductor with value pPar("L"). When instantiating the cell we would set C=DESIGNVARIABLE_C and L=DESIGNVARIABLE_L. In the label I would like to see the result of ZW=sqrt(L/C), but values of the design variables (DESIGNVARIABLE_C and DESIGNVARIABLE_L) should be taken into accout. Is there any easy way to evaluate the expression sqrt(l/C) in SKILL? I have had a look at ael* functions to interpret expressions, but the parser seems to be unable to find out design variable values. I am using IC 5.1.41 with analog design environment for the global variables.

Thank you so much for your help,

 
Phil 

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  • Andrew Beckett

    Phil,

    If you make the labels with expressions cdsParam(1) cdsParam(2) etc, you can use the CDF (interpreteted labels section) or Edit Component Display in the schematic editor to do what you want. You'd do  Edit->Component Display, click on the instance, and select "Parameter" on the form. You should see a number of cyclic fields (one per cdsParam() on the master you've selected) and you can change this to C, L etc. If you set the evaluation from "literal" to "full", it will fully evaluate the expression and design variables etc, based on the lineage down to the instance (i.e. if you've pushed through the hierarchy, you'll see the specifi evaluation of that hierarchical path).

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Phil,

    If you make the labels with expressions cdsParam(1) cdsParam(2) etc, you can use the CDF (interpreteted labels section) or Edit Component Display in the schematic editor to do what you want. You'd do  Edit->Component Display, click on the instance, and select "Parameter" on the form. You should see a number of cyclic fields (one per cdsParam() on the master you've selected) and you can change this to C, L etc. If you set the evaluation from "literal" to "full", it will fully evaluate the expression and design variables etc, based on the lineage down to the instance (i.e. if you've pushed through the hierarchy, you'll see the specifi evaluation of that hierarchical path).

    Regards,

    Andrew.

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