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Transfer design variable from schematic / layout to av_extracted view

FM202408077836

Hi Cadence Community,

I am using the following software: Virtuoso Studio version IC23.1-64b.ISR7.27.

I have written a Verilog-A model, created the symbol and a schematic (including the symbol). This model has a float variable. In the property dialog of the symbol, I could select this Verilog-A variable and assign a design variable name to it (my_var). Later, I assigned different values to my_var in a maestro file to check how my circuit behaves with different values. So far everything works as expected. Next, I have created a layout including this model and I can see the Verilog-A variable still includes my_var. I configured all necessary tools to generate the av_extracted view with Pegasus-Quantus. Afterwards, I noticed that my_var was replaced by the default CDF value of the Verilog-A variable in the av_extracted view. 

Does someone know how to ensure that my_var is transferred from the schematic / layout into the av_extracted view and not the default CDF value?

Felix

  • FM202408077836
    I have found the following solution:
    - Open the av_extracted view in the layout tool
    - Navigator → Filter all affected instances → Select all
    - Connectivity → Update → Layout Parameters
    - A log file opens and shows that all default CDF values are replaced correctly with the corresponding my_var defined in the schematic instances
    - Save
    Felix
  • Andrew Beckett
    in reply to FM202408077836

    I would suggest you contact customer support about this, because having to edit the extracted view shouldn't be needed - that said, it's a little unusual having a veriloga model which then ends up in the extracted view (I can't quite picture how you have this set up). It would be worth working through this with an AE who can see your setup and then see if there's a better way to transfer the schematic information across to the extracted view (there is a mechanism to do this with extracted devices, so potentially that could be used here).

    Andrew

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