The default in batch mode is to run till the end of the test and exit. Unless you ask it to, the simulator won't probe waveforms to a file. You have various choices including: Run with Tcl interactive mode by adding -tcl to your xrun command Run in batch mode with a Tcl script to control the simulation (-input your_script.tcl) If you create a Tcl file and add the relevant probing commands then you can use the GUI in post-processing mode after the simulation ends. The simplest probing command would be something like: probe -create -shm [scope -tops] -all -depth to_cells But I would advise you to read the documentation for the probe command to fully understand what the options are, to get what you need for your actual debugging requirements.
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