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save AHDL variables

PE202503078250

I'm using virtuoso version IC23.1-64b and using the ams simulator.

I'm using a Verilog block, and want to plot certain AHDL variables within the block.

However, I can plot it by saving all the nets and all AHDL variables in the save options, which does in fact increase the simulation time.

How can I plot only the selected AHDL variables and the selected nets ?

I came across the below post

https://support.cadence.com/apex/techpubDocViewerPage?xmlName=anasimhelp.xml&title=Virtuoso%20ADE%20Environment%20Variables%20Reference%20--%20saveahdlvars%20-%20saveahdlvars&hash=&c_version=IC25.1&path=anasimhelp/anasimhelpIC25.1/saveahdlvars.html

But, is there a way to do it in the GUI (in the above mentioned Cadence version) ?

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  • Andrew Beckett

    You can do this in ADE by using Outputs->Add->Op Parameters. This will add a row to your outputs in ADE and there are two "..." buttons. The first selects the instance - you might find if you do this that it won't let you select the instance - it might say:

    *Warning* object selected is not a valid selection object

    This is because there are some checks in there which try to see whether this is a primitive element or not, and this can get confused if you have both a schematic and a veriloga model. So you might need to type in the instance name (for example "/I7"). Then the second "..." allows you to pick the "parameters" to save (which will be any of the variables). For example, within in my Verilog-A model:

    parameter real pole_sec = 18.0M;
    real c1, r1;
    real r_rout,gm_nom, vin_val;
    real vmax_in_p, vmax_in_n, iin_max_p, iin_max_n;
    electrical cout, vref;
    electrical c2;

    If I press the "Get from simulation" button it shows this:

    I can then select the variables I want to save for this instance. Or I could just type them into the second entry box. By the way, if you were wondering why some were omitted (the last line of variables in my model) - this is because they were declared but never used - so there was nothing to save from the simulator.

    Regards,

    Andrew

  • PE202503078250
    in reply to Andrew Beckett

    Hi Andrew,

    Thanks for the reply. 

    I tried the above. However, the 'Get from Simulation' button doesnt populate the variables for me. So I tried adding it manually. However, it allows me to enter only 1 variable. The moment I enter a 2nd oppoint variable to the Outputs, it replaces the old oppoint variable. Is there something that I'm missing.

  • Andrew Beckett
    in reply to PE202503078250

    Add the variables space-separated like this;

    Andrew

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  • Andrew Beckett
    in reply to PE202503078250

    Add the variables space-separated like this;

    Andrew

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