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Importing digital data as an input source

MostafaAbedi

Hi everyone

Is it possible to set an extracted digital simulation result (digital vectors) as an input source to another simulation setup? I know extracting analog simulation waveform in “Spectre” type and importing it through vsource (as PWL file) is possible. I want to know if the same thing is possible for digital simulation result, for example a 6bit output of a simulation result?

Mostafa

  • Mostafa,

    This is probably related to your other post. You can save VCD files (or EVCD) and then use these as input to Spectre (or analog nodes in AMS) via Setup->Simulation Files and then the vector inputs tab. This can't however be used for digital inputs in AMS - for that, there's not really a solution other than using xmgentb to generate a test bench from a VCD file).

    Andrew

  • in reply to Andrew Beckett

    Thank you so much for your answer.

    The method I used to import the digital input from an FSDB file into my AMS simulation environment involved the following steps: First, I opened the FSDB file in ViVA and expanded the digital data—for example, a 4-bit data into 4 separate digital signals. Then, using the 'Measurement' option in ViVA, I converted these digital signals into analog, one by one. Then, I exported them individually in 'Spectre' format. As a result, in the AMS environment, I need to place 4 'vsource' elements for a 4-bit data set.

     I am not sure if this method is reasonable, but I don't see options to export the digital data in VCD or EVCD format when using ViVA (see the attached screenshot).

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