Add verilator testbench

testbench.cc

@@ -0,0 +1,27 @@
+#include "Vpicorv32_wrapper.h"
+#include "verilated_vcd_c.h"
+
+int main(int argc, char **argv, char **env)
+{
+	Verilated::commandArgs(argc, argv);
+	Verilated::traceEverOn(true);
+	Vpicorv32_wrapper* top = new Vpicorv32_wrapper;
+
+	VerilatedVcdC* tfp = new VerilatedVcdC;
+	top->trace (tfp, 99);
+        tfp->open ("testbench.vcd");
+	top->clk = 0;
+	int t = 0;
+	while (!Verilated::gotFinish()) {
+		if (t > 200)
+			top->resetn = 1;
+		top->clk = !top->clk;
+		top->eval();
+		tfp->dump (t);
+		t += 5;
+	}
+	tfp->close();
+	delete top;
+	exit(0);
+}
+