If you look at the expanded help message, you'll see that the simulator appears to be stopped in a call to the analog model; you need to bring it back into the digital domain before you can issue this particular Tcl call. bash-4.1$ nchelp ncsim CLNAIA ncsim/CLNAIA = Calling system tasks/functions or C-language user defined functions is not supported while the analog engine is interactive. Use the run -sync command to advance the simulator to where the digital engine is active before issuing the call command.
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