Hi, I have recently started using PSL assertions in a Verilog design which we are simulating with ncsim. Assertion based verification seems to be the way to go, so we are keen to adopt this approach, but are having some tools issues: When an assertion fails it generates an error e.g. ncsim: *E,ASRTST (/home/user/Projects/hw/foo/vlog/ram_inst_sp48x64.v,44): (time 1473705 NS) Assertion tb.s1b0.NeverWeAndRe has failed Running the simulation in noninteractive mode, the simulation exits when the number of errors reaches errormax (which we have set at 10 using -errormax 10 in the hdl.var file). The problem is that if ncsim was dumping waveforms to a .shm simulation database, not all the buffered data gets flushed to the database before the simulation exits. This means when I go to look at my waveforms to try to debug the source of the assertion failure, I don't actually have waveforms which go the whole way to the point where the assertion(s) failed. It says in the ncsim documentation that running the simulation with ncsim -run -tcl snapshotname Will make the simulation exit to the Tcl prompt on error, which would mean that buffered waveform data would be written to the database. However this does not seem to be the case: With -errormax 10, 10 errors are reported then simulation exits completely. Without specifying errormax simulation reports every error generated by PSL assertions but continues to run. The ONLY way I have been able to make ncsim exit to the Tcl prompt on an error generated by a PSL assertion failure has been to start the simulation in interactive mode i.e. ncsim -tcl snapshotname then to actually type run at the ncsim> prompt. I have tried using ncsim -tcl snapshotname -input file.tcl where file.tcl is a tcl script which simply contains the command run, but this does not work and behaves as described above for ncsim -run -tcl snapshotname. Has anyone any idea of a work around. We like to run our sims in non-interactive mode, since we can automate things that way for regression, but when we are running a sim for debug and capturing waveforms we would like to start it in non-interactive mode, and exit to the Tcl prompt, or at least flush any buffered waveform data to the database.
