两个四位二进制数加法器和乘法器的设计,编写测试代码和ucf约束文件

两个四位二进制数加法器的设计如下：

模块名称：Adder4
输入：A[3:0]，B[3:0]
输出：Sum[3:0]

代码如下：

module Adder4(
    input [3:0] A,
    input [3:0] B,
    output reg [3:0] Sum
);
    
    always @(*)
    begin
        Sum = A + B;
    end
    
endmodule

对应的UCF约束文件如下：

NET "A[0]" LOC = "X1";
NET "A[1]" LOC = "X2";
NET "A[2]" LOC = "X3";
NET "A[3]" LOC = "X4";
NET "B[0]" LOC = "X5";
NET "B[1]" LOC = "X6";
NET "B[2]" LOC = "X7";
NET "B[3]" LOC = "X8";
NET "Sum[0]" LOC = "X9";
NET "Sum[1]" LOC = "X10";
NET "Sum[2]" LOC = "X11";
NET "Sum[3]" LOC = "X12";

两个四位二进制数乘法器的设计如下：

模块名称：Multiplier4
输入：A[3:0]，B[3:0]
输出：Product[7:0]

代码如下：

module Multiplier4(
    input [3:0] A,
    input [3:0] B,
    output reg [7:0] Product
);
    
    always @(*)
    begin
        Product = A * B;
    end
    
endmodule

对应的UCF约束文件如下：

NET "A[0]" LOC = "X1";
NET "A[1]" LOC = "X2";
NET "A[2]" LOC = "X3";
NET "A[3]" LOC = "X4";
NET "B[0]" LOC = "X5";
NET "B[1]" LOC = "X6";
NET "B[2]" LOC = "X7";
NET "B[3]" LOC = "X8";
NET "Product[0]" LOC = "X9";
NET "Product[1]" LOC = "X10";
NET "Product[2]" LOC = "X11";
NET "Product[3]" LOC = "X12";
NET "Product[4]" LOC = "X13";
NET "Product[5]" LOC = "X14";
NET "Product[6]" LOC = "X15";
NET "Product[7]" LOC = "X16";