verilator——牛刀小试

安装verilator可见：https://blog.csdn.net/qq_40676869/article/details/132648522?spm=1001.2014.3001.5501

正文开始

编写一个异或的电路模块如下：
top.v

module top(input a,input b,output f
);assign f = a ^ b;
endmodule

编写C++测试文件
tb_top.cpp

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "verilated.h"
#include "verilated_vcd_c.h"
#include "Vtop.h"#define MAX_SIM_TIME 200
vluint64_t sim_time = 0;int main(int argc, char** argv) {Vtop *dut = new Vtop;Verilated::traceEverOn(true);VerilatedVcdC* m_trace = new VerilatedVcdC;dut->trace(m_trace, 5);m_trace->open("waveform.vcd");while (sim_time < MAX_SIM_TIME) {int a = rand() & 1;int b = rand() & 1;dut->a = a;dut->b = b;dut->eval(); printf("a = %d, b = %d, f = %d\n", a, b, dut->f);m_trace->dump(sim_time);sim_time++;assert(dut->f == (a ^ b));}m_trace->close();delete dut;return 0;
}

编译并运行

verilator --cc --trace --exe --build -Wall tb_top.cpp top.v

–cc 将.v文件翻译成c++
–exe 创建可执行文件
–build verilator自动进行make
–trace 记录波形

查看波形

sudo apt install gtkwave
gtkwave waveform.vcd

波形如下：

github链接：https://github.com/mulinhu/CPPer/tree/main/verilog/demo1