windows XP下 iverilog+GTKWave使用（三）

windows XP下 iverilog+GTKWave使用（二）当中只有一些显示信息在终端里面，这里讲讲如何生成lxt2文件以便可以被GTKWave调用。在counter_tb.v文件里添加以下语句：

initial
		begin			
			$dumpfile("test.vcd");
			$dumpvars(0,test);
		end

最终文件如下：

`timescale 1ns/1ns
module test;

    /*Make a reset that pulses once.*/
	reg reset = 0;
	
	initial
		begin
			#17 reset = 1;
			#11 reset = 0;
			#29 reset = 1;
			#11 reset = 0;
			#100 $stop;
		end
	
	/*Make a regular pulsing closk*/
	
	reg clk = 0;
	always #5 clk = !clk;
	
	wire [7:0] value;
	counter c1 (value, clk, reset);
	
	initial
		$monitor("At time %t, value = %h (%0d)",$time, value, value);
	initial
		begin			
			$dumpfile("test.vcd");
			$dumpvars(0,test);
		end
endmodule

另存为counter_tb_gtk.v，然后进行下面的命令：
G:\Verilog HDL\iverilog\Demo\counter>iverilog -o test counter.v counter_tb_gtk.v

G:\Verilog HDL\iverilog\Demo\counter>ls
counter.v     counter_tb_gtk.v  my_design  test
counter_tb.v  file_list.f       mydesign

G:\Verilog HDL\iverilog\Demo\counter>vvp -n test -lxt2
LXT2 info: dumpfile test.vcd opened for output.
At time                    0, value = xx (x)
At time                   17, value = 00 (0)
At time                   35, value = 01 (1)
At time                   45, value = 02 (2)
At time                   55, value = 03 (3)
At time                   57, value = 00 (0)
At time                   75, value = 01 (1)
At time                   85, value = 02 (2)
At time                   95, value = 03 (3)
At time                  105, value = 04 (4)
At time                  115, value = 05 (5)
At time                  125, value = 06 (6)
At time                  135, value = 07 (7)
At time                  145, value = 08 (8)
At time                  155, value = 09 (9)
At time                  165, value = 0a (10)

G:\Verilog HDL\iverilog\Demo\counter>cp test.vcd test.lxt

G:\Verilog HDL\iverilog\Demo\counter>gtkwave test.lxt

未完待续。。。（见（四））