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Problem with Co-simulation: Cadence Virtuoso and Matlab

Conhas

When simulate (transient )my design stand alone, it works but when I try to co-simulate it with MATLAB I get the following errors,  please help

Error found by spectre during hierarchy flattening.
    ERROR:  Co-simulation outputs setting error: Unknown error. Check output freqOut.


Time for EDB Visiting: CPU = 6.999 ms, elapsed = 6.19507 ms.
Time accumulated: CPU = 877.866 ms, elapsed = 2.97763 s.
Peak resident memory used = 89.7 Mbytes.

spectre terminated prematurely due to fatal error.

Please Help.

Thank you very very much in advance.

  • Andrew Beckett

    Almost certainly the best thing to do here is to contact customer support. I doubt we'll get very far without being able to see more details as to what you're trying to do.

    Which MMSIM version are you using (i.e. which subversion of spectre are you using - this should appear in the spectre.out output log near the top). From your task bar it appears to be Matlab R2014b, but knowing which spectre version is important too. This is to try to spot if it's a know issue based on the simulator version, but I'm still fairly sure you'll need to go to customer support.

    Kind Regards,

    Andrew.

  • Conhas
    Thank you very very much for your prompt response.
    When I try to simulate small blocks - they do get simulated without having errors. i.e. i have simulated to the without the last block and I get the desired results.
    The last block (with pin freqOut) also gets simulated in stand alone mode but not when in this configuration.

    Cadence/MMSIM_11.10HF509

    Thank you very much once again
  • Andrew Beckett

    No idea then, sorry - however, I would suggest trying something newer than a 4-5 year old simulator release (especially in terms of compiler compatibility with Matlab; it's unlikely we "support" such a newer version of Matlab in a release from 2 years or so beforehand).

    Actually, I just took a look at the schematic - and I see that the node is labelled FB, but has a pin on it called freqOut. This is legal, but my guess is that the net in the netlist is called "FB" not "freqOut". So try changing the name on the Matlab/Simulink setup form to "FB" and see if that works instead. I'm assuming you didn't use the "Select" button next to the Cosimulation Outputs button as this should have picked the net name (unless of course you added the label later).

    Regards,

    Andrew.

  • Conhas
    Dear Andrew,

    Thank you very much. It works!!
    I renamed the output as FB as well as the pin and then in the set up window.
    I tried to use the "select" button in the setup window but it did not pick up any name therefore I named it manually.

    Thanks and Best Regards
    Conhas Thakkar

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