verilog语言设计八位全加器代码及对应测试文件代码

以下是 Verilog 语言设计的 8 位全加器代码及对应测试文件代码：

1. 8 位全加器代码

module full_adder_8bit(
  input [7:0] a,
  input [7:0] b,
  input cin,
  output [7:0] sum,
  output cout
);

  wire [7:0] c;
  wire [6:0] c_int;

  assign c_int[0] = (a[0] & b[0]) | (a[0] & cin) | (b[0] & cin);
  assign c_int[1] = (a[1] & b[1]) | (a[1] & c_int[0]) | (b[1] & c_int[0]);
  assign c_int[2] = (a[2] & b[2]) | (a[2] & c_int[1]) | (b[2] & c_int[1]);
  assign c_int[3] = (a[3] & b[3]) | (a[3] & c_int[2]) | (b[3] & c_int[2]);
  assign c_int[4] = (a[4] & b[4]) | (a[4] & c_int[3]) | (b[4] & c_int[3]);
  assign c_int[5] = (a[5] & b[5]) | (a[5] & c_int[4]) | (b[5] & c_int[4]);
  assign c_int[6] = (a[6] & b[6]) | (a[6] & c_int[5]) | (b[6] & c_int[5]);
  assign c[7] = (a[7] & b[7]) | (a[7] & c_int[6]) | (b[7] & c_int[6]);

  assign sum = a + b + cin;
  assign cout = c[7];
  
endmodule

2. 对应测试文件代码

module test_full_adder_8bit;

  reg [7:0] a;
  reg [7:0] b;
  reg cin;
  wire [7:0] sum;
  wire cout;

  full_adder_8bit dut (
    .a(a),
    .b(b),
    .cin(cin),
    .sum(sum),
    .cout(cout)
  );

  initial begin
    // Test case 1
    a = 8'b00000000;
    b = 8'b00000000;
    cin = 0;
    #10;
    if (sum != 8'b00000000 || cout != 0) $error("Test case 1 failed");

    // Test case 2
    a = 8'b11111111;
    b = 8'b00000001;
    cin = 0;
    #10;
    if (sum != 8'b11111112 || cout != 0) $error("Test case 2 failed");

    // Test case 3
    a = 8'b11111111;
    b = 8'b00000001;
    cin = 1;
    #10;
    if (sum != 8'b11111113 || cout != 0) $error("Test case 3 failed");

    // Test case 4
    a = 8'b01111111;
    b = 8'b10000000;
    cin = 0;
    #10;
    if (sum != 8'b11111111 || cout != 0) $error("Test case 4 failed");

    // Test case 5
    a = 8'b01111111;
    b = 8'b10000000;
    cin = 1;
    #10;
    if (sum != 8'b00000000 || cout != 1) $error("Test case 5 failed");

    // Test case 6
    a = 8'b01010101;
    b = 8'b01010101;
    cin = 0;
    #10;
    if (sum != 8'b10101010 || cout != 0) $error("Test case 6 failed");

    // Test case 7
    a = 8'b10101010;
    b = 8'b10101010;
    cin = 0;
    #10;
    if (sum != 8'b01010100 || cout != 1) $error("Test case 7 failed");

    // Test case 8
    a = 8'b11111111;
    b = 8'b11111111;
    cin = 1;
    #10;
    if (sum != 8'b11111111 || cout != 1) $error("Test case 8 failed");

    $display("All test cases passed");
    $finish;
  end

endmodule

这个测试文件中包含了 8 个测试用例，分别对应不同的输入和期望输出，可以通过运行仿真来进行验证。