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VerilogA Variables when using Trasient Restart in Spectre

TjaartOpperman
I'm a running a simulation with some of my custom VerilogA modules included. In these modules I have some variables that vary throughout the simulation, and there are many instances of these modules. The circuit that I am simulating is also a very large circuit. I am therefore running it in liberal mode and not storing any current. At some timepoint, I need to debug the circuit. So now I am trying to restart the circuit using the file specified by the "writefinal" command from the previous sim. But as I was investigating the final transient solution file, I did not seem to recognize any lines specifying the values of the internal variables of my custom VerilogA modules. Are these variables saved by the "writefinal" command? If not, there must be a way to save the values of these variables to some file at the end of the simulation manually? But then, will it at all be possible to read such a file at the start of the next simulation, and force the variables to their correct values?
  • Andrew Beckett

    Using writefinal for this is keeping an incomplete state of the circuit - that's intended to be a nodeset, and is not really geared up to do a full restart.

    Instead use the save parameters on tran (i.e. saveperiod/saveclock/savetime/savefile - see "spectre -h tran" for more details), and then use the recover parameter to restart simulation from the saved file. Note that when you do this,it automatically starts at the time the save occurred at (no need to mess around with tstart, etc). These parameters are designed for storing the state of the simulator at a particular point (or points) in time.

    Regards,

    Andrew.

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