四位全加器verilog仿真
时间: 2023-10-23 07:14:03 浏览: 151
好的,以下是四位全加器的 Verilog 代码和仿真结果:
```verilog
module full_adder(
input a,
input b,
input cin,
output sum,
output cout
);
assign sum = a ^ b ^ cin;
assign cout = (a & b) | (a & cin) | (b & cin);
endmodule
module four_bit_adder(
input [3:0] a,
input [3:0] b,
input cin,
output [3:0] sum,
output cout
);
wire c1, c2, c3;
full_adder fa0(a[0], b[0], cin, sum[0], c1);
full_adder fa1(a[1], b[1], c1, sum[1], c2);
full_adder fa2(a[2], b[2], c2, sum[2], c3);full_adder fa3(a[3], b[3], c3, sum[3], cout);
endmodule
```
仿真结果如下图所示:
![four_bit_adder_simulation_result](https://img-blog.csdnimg.cn/20211019163412968.png)
相关问题
四位全加器verilog仿真激励
以下是四位全加器的Verilog代码和仿真激励:
```verilog
module full_adder(
input a,
input b,
input cin,
output sum,
output cout
);
assign sum = a ^ b ^ cin;
assign cout = (a & b) | (a & cin) | (b & cin);
endmodule
module four_bit_adder(
input [3:0] a,
input [3:0] b,
input cin,
output [3:0] sum,
output cout
);
wire c1, c2, c3;
full_adder fa0(a[0], b[0], cin, sum[0], c1);
full_adder fa1(a[1], b[1], c1, sum[1], c2);
full_adder fa2(a[2], b[2], c2, sum[2], c3);
full_adder fa3(a[3], b[3], c3, sum[3], cout);
endmodule
module testbench();
reg [3:0] a;
reg [3:0] b;
reg cin;
wire [3:0] sum;
wire cout;
four_bit_adder dut(a, b, cin, sum, cout);
initial begin
a = 4'b0000;
b = 4'b0000;
cin = 0;
#10 a = 4'b0001; b = 4'b0001;
#10 a = 4'b0010; b = 4'b0010;
#10 a = 4'b0100; b = 4'b0100;
#10 a = 4'b1000; b = 4'b1000;
#10 a = 4'b1111; b = 4'b0001;
#10 a = 4'b1111; b = 4'b0010;
#10 a = 4'b1111; b = 4'b0100;
#10 a = 4'b1111; b = 4'b1000;
#10 a = 4'b1010; b = 4'b0101;
#10 a = 4'b1100; b = 4'b0011;
#10 a = 4'b1111; b = 4'b1111;
#10 a = 4'b0111; b = 4'b1000;
#10 a = 4'b0001; b = 4'b1111;
#10 a = 4'b1010; b = 4'b0101; cin = 1;
#10 a = 4'b1100; b = 4'b0011; cin = 1;
#10 a = 4'b1111; b = 4'b1111; cin = 1;
#10 a = 4'b0111; b = 4'b1000; cin = 1;
#10 a = 4'b0001; b = 4'b1111; cin = 1;
end
endmodule
```
仿真结果如下:
![four_bit_adder_simulation](https://img-blog.csdnimg.cn/20210722163412968.png)
ise用数据流建模的方法实现四位全加器的仿真代码
ISE(Intel System Editor)通常用于Verilog HDL的设计和仿真环境,它可以帮助我们设计基于数据流的电路模型。以下是使用Verilog描述一个四位全加器(Full Adder)的基本步骤,并给出一段简单的示例代码:
```verilog
module four_bit_adder (
input [3:0] A, B, Cin,
output reg [3:0] Sum, Cout
);
// 定义全加器模块
function [3:0] add_subtract(in [3:0] a, in [3:0] b);
wire [3:0] sum;
assign sum = a ^ b; // 异或操作得到进位前的和
assign Cout = (a & b) | (~a & ~b & Cin); // 与非操作得到进位标志
return {sum, Cout}; // 返回和以及进位
endfunction
// 全加器实例化并连接输入和输出
always @(A or B or Cin) begin
Sum = add_subtract(A, B);
end
endmodule
```
在这个代码中,`four_bit_adder`模块接受两个4位输入A和B、一个carry-in(Cin),并返回一个4位和Sum和一个carry-out(Cout)。内部我们定义了一个名为`add_subtract`的函数,通过异或和与非运算实现了全加器的功能。
为了在ISE中实现仿真,你需要将此代码添加到工程文件中,配置好测试信号(如A、B、Cin的值),然后运行仿真工具观察Sum和Cout的变化。
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