![]() We can generate waveforms by Verilog HDL's system function $dumpfile, which specifies the data of certain modules and signals in the simulation by $dumpvars parameters. Because VCD is part of the Verilog HDL language standard, all Verilog emulators are capable of implementing this feature, as well as allowing users to dump VCD files through system functions in Verilog code. It is because it contains the signal change information, it is equivalent to record the entire simulation information, we can use this file to reproduce the simulation, we can display the waveform. It mainly contains the header information, the variables of the predefined and variable value of the change information. VCD files are an ASCII file defined in the IEEE1364 standard (Verilog HDL language standard). ![]() VCD (Value change Dump) is a common format. ![]() It is emphasized that this WLF file can only be generated by Modelsim and can only be displayed by Modelsim. Vsim-view vsim.wlf-do run.do where the content of run.do is the waveform signal to be viewed. Next time we can open this saved waveform directly via Modelsim. But when we look at waveforms in the waveform window, a *.wlf file is generated at the end of the simulation (the default is Vsim.wlf). WLF (wave Log file) is a waveform file supported by Mentor Graphics company Modelsim. Say a few waveform files Wlf (wave Log file), VCD (Value change Dump) file, Fsdb (Fast Signal DataBase) file, SHM, VPD:ฤก, for WLF waveform log file, as long as we have used Modelsim, should be very familiar. Simulation is an indispensable step in IC design, and it is necessary to record the waveform file for detailed analysis and research. ![]()
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