GTKWave: Freeware VCD viewer, seems far better then other free VCD viewers.Dinotrace : Freeware VCD viewer from Veritools.Also most of the simulators can write out VCD files - both VHDL & Verilog, though in Verilog you could do it more easily (than in VHDL - where you have to go through your simulator's C-API) with the system tasks like $dumpvars. This is a STANDARD format and is compatible between different waveform viewers etc. VCD - Value Change Dump format - is an ASCII file that contains the "Changes in Values of Signals". What is VCD and is there any free tool to view it ? Finsim from Fintronic offers 350 Components for $100 as student version.Silos from Simucad offers 350 lines in demo mode.There are very few commercial simulators which offer student versions. Is there any student version of commercial simulators ? Verilator : Verilator is a compiled cycle-based simulator, which is free, but performs as fast as the commercial products. I hope someday this simulator will support all the Verilog constructs. Currently synthesis support is being added. There are not many options you could start with Icarus Verilog simulator, this is very actively developed. Where can I get a free version of a Verilog Simulator ? ![]() This section is about frequent questions asked about Verilog Tools.
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