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maestro - .tcl file - signals not saved when running monte carlo, single run is working

michael10

Hi,

in an AMS maestro testbench, the internal vhdl variables of a digital instance should be evaluated.

This is done by a ams_sim.tcl-file, which has probe statements:
probe -create -emptyok -database ams_database {tb_xxx.DIGITAL_WRAPPER.vdhl_instance} -all -variables -memories -sc_processes -depth all
This creates a probe and saves the signals for the specified hierarchy.

The ams_sim.tcl file is included in

This works perfectly when running Single Run, Swepps and Corners. The values can be accessed in the result browser and plotted / evaluated with the calculator.

But when running Monte Carlo Sampling, the digital signals are not saved.
It's the same testbench, the only thing that changes is to switch to Monte Carlo Sampling and set the corner file for monte carlo mismatch model.

Is this a known problem?

Is there a possible workaround (maybe different method to save vhdl variables)?

Edit: the Cadence version is IC6.1.8-64b.500.8

  • I just tried this (sorry about the delay - one of those things that needed a bit of time to put an example together) - it worked fine when I did this. 

    Have you chosen the option to "Save Waveforms" on the Advanced Monte Carlo options? Which XCELIUM and Spectre versions are you using? (assuming that it's recent enough, I'm guessing you'd be using AMS Flex). Also, which output format?

    See this other post - maybe you're hitting the same issue they were (I don't know which simulator versions were being used there).

    Andrew.

  • in reply to Andrew Beckett

    Hi Andrew,

    the setup is the following:
    - Output format: sst2
    - "Save Waveforms (Simulation Data)" on the Advanced Monte Carlo options is set.
    - xrun(64): 20.03-s005
    - spectre Version 19.1.0.348.isr6 64bit

    In the xrun log, I see "Flex mode is disabled because SPECTRE 19.1 ISR5 or older was found."

  • in reply to michael10

    All I can suggest is that you try again with the latest versions of XCELIUM and SPECTRE and if it still happens, report to customer support. I haven't been able to reproduce it.

    Andrew.

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