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Plotting Subcircuit Voltages

hoodskier

Hello again,

I have a circuit that I've created a symbol for and I am simulating it using spectre/ViVA.  I'm trying to figure out how to plot a subcircuit voltage with no success thus far.  I read through this topic: http://community.cadence.com/cadence_technology_forums/f/38/t/19825 and I believe it's similar to the problem I'm having but I'm not understanding if we're quite asking the same question.

In the save option menu I tried the save all option as well as the nestlvl option with N set to 2 (my symbol has one more layer of symbols used inside of it).  When I attempt to plot the signal which I found from the netlist nothing happens (the CIW says that the signal doesn't exist).  The CIW says to type outputs() to see a list of available outputs but this command also doesn't seem to work (I'm entering it in the CIW command line but it just shows up on the next line and nothing happens).  One of the lines from my netlist is:

stage\<63\> (clk_in\<63\> clk_in\<64\> gnd Vin out vsel\<63\> vdd) stage

I'm interested in plotting clk_in\<63\> clk_in\<64\>, stage is another subcircuit used within my symbol and these are the wires connecting it if that isn't clear.  Please help, thank you.

-Kevin

  • Hi Kevin,

    This sounds like a node mapping issue as I have experienced similar issues when simulating in standalone spectre as opposed to simulating from ADE directly. In my experience, this often happens when using an extracted view based netlist and simulating in batch mode (LSF submissions for example).

    The issue may have to do with the amaps directory. To find the appropriate syntax for the signal name in question, you can use the outputs() command invoked from a short ocean script. If your simulation directory path is <path_to_psf>, the following ocean script will list the outputs:

    simulator('spectre)

    results = strcat("<path_to_psf>")

    openResults( results )

    selectResult ('tran) ; assuming you are looking for transient simulation results

    outputs()

    ; to print the node names that are saved to a file named "my_outputs.txt"

    ocnPrint( ?output "my_outputs.txt" outputs())

    You can invoke ocean from the command line by typing "ocean". Copy and paste the few lines above, and assuming I haven't created a syntax error, you should get a list of the outputs to either the screen or file "my_outputs.txt".

    I hope this is helpful Kevin!

    Shawn

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