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extend analog stop time

apple419

Hello,  

   In the xrun.log file of one of my mixed signal simulations (ams simulation), I see one line

"The analog simulator has reached stop time, please use 'analog -stop <new stop time>' to extend the analog stop time.

   My question is 1) where do i use this command? In CIW? I tried type this command in CIW but it says *Error* eval: undefined -analog

                    and 2)why it says analog stop time? does it only apply to analog simulation not digital simulation?

Thank you very much!

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  • Andrew Beckett

    When running in "batch" mode from ADE (under Simulation->Netlist and Run Options) then you can't do anything about this. This is really for when you run in "Interactive" or "debug" mode using SimVision. You can then enter a Tcl command to extend the analog stop time.

    In general, if the analog stop time is reached (which is usually the duration of the transient analysis) then the simulation stops, even if there's nothing in the digital side that has caused it to stop. If the digital parts hit a (say) $finish, then that will also cause the simulation to halt. Some analog accuracy controls are dependent upon the stop time, so it's important for the analog solver to know roughly the expected stop time for that when running - but we do allow you via Tcl to extend the stop time. As I said, this has to be entered at either the Tcl prompt (if run from the command line) or in Simvision in the "simulator" tab of the Simvision console. So for example, if I'd originally set my transient to stop at 50u, I can then type:

    analog -stop 100us
    run

    and it will continue to 100us instead.

    Regards,

    Andrew.

  • apple419
    in reply to Andrew Beckett

    Andrew,

       Thanks for your detailed explanation! I was curious at beginning thinking this might be powerful. Now I see this doesn't work for me since I only use "batch" mode in ADE L. Maybe something worthwhile to try in the future about the interactive mode.

       Thanks again!

    Regards,

    Apple419

Reply
  • apple419
    in reply to Andrew Beckett

    Andrew,

       Thanks for your detailed explanation! I was curious at beginning thinking this might be powerful. Now I see this doesn't work for me since I only use "batch" mode in ADE L. Maybe something worthwhile to try in the future about the interactive mode.

       Thanks again!

    Regards,

    Apple419

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