Verilator_SIM_standalone

This is a Verilator simulation demo, it shows how to work with Verilator in a main program simulation.cpp.

flicker.v is a verilog module, which flips all its bits per cycle.

//flicker.v
module flicker(clk, rst_n, dout);
parameter WIDTH = 5;
input clk, rst_n;
output reg [WIDTH-1:0] dout;

always@(posedge clk or negedge rst_n)

    if(!rst_n)
        dout <= { WIDTH{ 1'b0 } };
    else
        dout <= ~dout;

endmodule

Here WIDTH is 5, so output port dout would be 0 = (00000)_2 after reset by input signal rst_n, then switch between 0 = (00000)_2 and 31 = (11111)_2.

Use this line to call Verilator compile the flicker.v

$ verilator -Wall --cc flicker.v --exe simulation.cpp 

Then, make the project

$ make -j -C obj_dir/ -f Vflicker.mk Vflicker

Run the executable.

$ obj_dir/Vflicker