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OCC (Operating Condition Check) simulation using AMS

Ashwathmp

Hi,

I have testbench setup to do AMS simulation. The simulation runs fine when I use the regular simulation models. When I replace the regular models with those meant for OCC simulation, I get the following error message -

 " ncsim: *E,RNALER: Simulation terminated due to analog error."

 Is OCC simulation supported by AMS simulator? If yes, can someone help me debug this error.

Thanks,

Ashwath 

Parents
  • Andrew Beckett

    Ashwath,

    That's what I was doing - I was running with AMS (just from the command line). There is no confusion (from my part). When you simulate with AMS, you are using a mixed-signal simulator which has an analog solver (spectre, aps or ultrasim) to handle the analog parts, and the ncsim engine for the digital parts (all integrated into the same simulator).

    From the document you posted, it appears (by reading between the lines) that this is not using spectre's assert capability but has been implemented using VerilogA models to do the device checks. Perhaps it is so old that it pre-dates assert?  That said, spectre has supported "assert" for at least 11 years (I forget exactly when it was introduced, but the oldest version I have handy, partly due to OS/platforms I have available, is IC5033, and it's in that...)

    That said, even if VerilogA models are used to do this, it ought to work. If it doesn't, we'll need to see it (I would suggest you check first with the latest simulator version, which is INCISIV141 - or if you have INCISIV132 that's recent enough to get a good test). If it's still broken, go to customer support.

    Kind Regards,

    Andrew.

Reply
  • Andrew Beckett

    Ashwath,

    That's what I was doing - I was running with AMS (just from the command line). There is no confusion (from my part). When you simulate with AMS, you are using a mixed-signal simulator which has an analog solver (spectre, aps or ultrasim) to handle the analog parts, and the ncsim engine for the digital parts (all integrated into the same simulator).

    From the document you posted, it appears (by reading between the lines) that this is not using spectre's assert capability but has been implemented using VerilogA models to do the device checks. Perhaps it is so old that it pre-dates assert?  That said, spectre has supported "assert" for at least 11 years (I forget exactly when it was introduced, but the oldest version I have handy, partly due to OS/platforms I have available, is IC5033, and it's in that...)

    That said, even if VerilogA models are used to do this, it ought to work. If it doesn't, we'll need to see it (I would suggest you check first with the latest simulator version, which is INCISIV141 - or if you have INCISIV132 that's recent enough to get a good test). If it's still broken, go to customer support.

    Kind Regards,

    Andrew.

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