路上的旅客

4 位计数器module count(out,reset,clk);output[3:0] out;input reset,clk;reg[3:0] out;always @(posedge clk)beginif (reset) out<=0; //同步复位else out<=out+1; //计数 endendmodule

4 位全加器【例 3.1】4 位全加器module add4(cout,sum,ina,inb,cin);output[3:0] sum;output cout;input[3:0] ina,inb;input cin;assign {cout,sum}=ina+inb+cin;endmodule

4 位计数器的激励程序`timescale 1ns/1ns`include "count4.v"module coun4_tp;reg clk,reset; //测试输入信号定义为 reg 型wire[3:0] out; //测试输出信号定义为 wire 型parameter DELY=100;count4 mycount(out,reset,clk); //调用测试对象always #(DELY/

4 位全加器的激励程序4 位全加器的激励程序`timescale 1ns/1ns`include "adder4.v"module adder_tp; //测试模块的名字reg[3:0] a,b; //测试输入信号定义为 reg 型reg cin;wire[3:0] sum; //测试输出信号定义为 wire 型wire cout;integer i,j;adder4 adder(sum,cout,a,b,cin); //调用测试对象always #5 cin=~cin; //设定 c