BY: Calvin Wong (cawong) DATE: 2007-08-02 04:53 SUBJECT: Having trouble dumping a vcd file
Hello, I tried the latest 18.0.0 release of ruby-vpi and it definately is a lot more stable than 17.0.0 release. A lot of good features was added. Now as the message title says, I have difficulty generating a vcd file using the $dumpvars call. I edited the counter.v file and added 'initial $dumpvars' routine to it. I also modify the advance_time method in the vpi.rb file to get the current time (using vpi_get_time routine) and then add the aNumSteps to it to produce a monotonically increasing time steps. After the simulation is performed, I am left with a verilog.dump file but only up to 1 time tick was logged. I suspect that once the ruby execution is done, both the ruby simulation and the verilog (using vcs) simulation is terminated. When this happened , vcs does not have the time to flush out it's vcd logging buffer. So ... my question is if there is a way to relay control over to verilog so that the simulator can flush out the vcd buffer prior to ending the simulation? Calvin
