![]() In this case, it dumps ALL variables in the current testbench module and in all other modules instantiated by it. The simplest way to use it is without any argument. ![]() The $dumpvars is used to specify which variables are to be dumped ( in the file mentioned by $dumpfile). One more thing, the declaration onf $dumpfile must come before the $dumpvars or any other system tasks that specifies dump. But what exactly are we going to dump in this file ? Thhis is specified by $dumpvars that we will cover next. We can not have more than one $dumpfile statements in verilog simulation. A VCD (value change dump) stores all the information about value changes. ![]() The changes are recorded in a file called VCD file that stands for value change dump. Will dump the changes in a file named test.vcd. The $dumpvars is used to dump the changes in the values of nets and registers in a file that is named as its argument. We will now take a deeper look into these two system variables. In the waveform genration tutorial we had used $dumpfile and $dumpvars system tasks.
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