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CDF parameters reusing default value from veriloga

ernie123

I have a veriloga model for cell 'mosfet_model', where I declared parameters such as:

parameter real w = 2u;

parameter real l = 0.5u;

Then I create a schematic cell 'inverter' which instanciates a symbol of cell 'mosfet_model' and some other components.

I can edit the parameters w and l in the Object Properties of the instance of cell 'mosfet_model' and by default, they show the same default values as in the veriloga code. But I want to make them editable by parents of the 'inverter' cell.

So I change the properties in the mosfet_model instance as: w = pPar("w") and l = pPar("l").

Then I created symbol for 'inverter' and I can see the w and l parameters in inverter object properties.

So far, so good. But is there a way for 'inverter' to also show the same default values as in the veriloga?

Right now I see blank spaces for every parameter field in inverter object properties, but I would like it to automatically fill up with w = 2u and l = 0.5u that was in the veriloga, just like it does with 'mosfet_model'.

Is that possible? I know I can edit the CDF and add the default values explicitly, but I am worried about making changes in the veriloga that will not reflect on the CDF defaults, so I think it would be preferable to have the two linked together somehow.

EDIT: My tool version is IC 6.1.5

  • Andrew Beckett

    There's nothing that will link the default values through the hierarchy in the way you're suggesting.

    Regards,

    Andrew.

  • ernie123
    in reply to Andrew Beckett

    Ah that's too bad, but thank you. I will probably remove the parameters from inverter and only modify them through the veriloga in that case. In my situation I think the mosfet_model will not need to be changed a lot for different inverters, and if it does need to be changed I can create a different inverter2 cell type which uses the different model (except for w and l, the other parameters I have are physical parameters that should be intrinsic to the process). So I will keep pPar("w") and pPar("l") but keep the rest as constant in the veriloga.

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