(环境：Vivado 2017.4)

实验要求：

实验过程：

1.打开Vivado，创建文件，选择xc7a35tcpg236-1核。

 2.添加源文件。

calculate模块：

module calculate(
    input wire [7:0] num1,
    input wire [2:0] op,
    output reg [31:0] result
    );
    wire [31:0] num2;
    wire [31:0] Sign_extend;
    assign num2=32'h01;
    assign Sign_extend={24'b0,num1};
    always@(*)begin
      if(op == 3'b000)
        result=num2+Sign_extend;
      else if(op==3'b001)
        result=num2-Sign_extend;
      else if(op==3'b010)
        result=Sign_extend&num2;
      else if(op==3'b011)
        result=Sign_extend|num2;
      else if(op==3'b100)
        result=~num2;
      else if(op==3'b101)
        result=(num2<Sign_extend)?1:0;
      end 
endmodule

display模块：

module display(
    input wire clk,reset,
    input wire [31:0]s,
    output wire [6:0]seg,
    output reg [3:0]ans
    );
    reg [20:0]count;
    reg [4:0]digit; 
    always@(posedge clk,posedge reset)
    if(reset)  
        count = 0;
    else 
        count = count + 1;
       
    always @(posedge clk)
    case(count[20:19])
        0:begin
            ans = 4'b1110;
            digit = s[3:0];
        end
        
        1:begin
            ans = 4'b1101;
            digit = s[7:4];
        end

        2:begin
            ans = 4'b1011;
            digit =s[11:8];
        end
        
        3:begin
            ans = 4'b0111;
            digit = s[15:12];
        end
    endcase
    
    seg7 U4(.din(digit),.dout(seg));
endmodule

seg7模块：

module seg7(
    input wire [3:0]din,
    output reg [6:0]dout
    );
 
    always@(*)
    case(din)
        5'h0:dout = 7'b000_0001;
        5'h1:dout = 7'b100_1111;
        5'h2:dout = 7'b001_0010;
        5'h3:dout = 7'b000_0110;
        5'h4:dout = 7'b100_1100;
        5'h5:dout = 7'b010_0100;
        5'h6:dout = 7'b010_0000;
        5'h7:dout = 7'b000_1111;
        5'h8:dout = 7'b000_0000;
        5'h9:dout = 7'b000_0100;
        5'ha:dout = 7'b000_1000;
        5'hb:dout = 7'b110_0000;
        5'hc:dout = 7'b011_0001;
        5'hd:dout = 7'b100_0010;
        5'he:dout = 7'b011_0000;
        5'hf:dout = 7'b011_1000;
        default:dout = 7'b111_1111;        
    endcase
    
    
endmodule

顶层模块：

module top(
    input clk,
    input rst,
    input [2:0] op,
    input [7:0] num1,
    output [3:0] ans, //select for seg
    output [6:0] seg  //segment digital
    );
    wire [31:0] s;
    calculate U1(.num1(num1),.op(op),.result(s));
    
    display U2(.clk(clk),.reset(rst),.s(s),.ans(ans),.seg(seg));
endmodule

管脚约束文件：

set_property PACKAGE_PIN W5 [get_ports clk]                            
    set_property IOSTANDARD LVCMOS33 [get_ports clk]
    create_clock -add -name sys_clk_pin -period 10.00 -waveform {0 5} [get_ports clk]
set_property PACKAGE_PIN V16 [get_ports {op[0]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {op[0]}]    
set_property PACKAGE_PIN W16 [get_ports {op[1]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {op[1]}]
set_property PACKAGE_PIN W17 [get_ports {op[2]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {op[2]}]
set_property PACKAGE_PIN W15 [get_ports {num1[0]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[0]}]    
set_property PACKAGE_PIN V15 [get_ports {num1[1]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[1]}]    
set_property PACKAGE_PIN W14 [get_ports {num1[2]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[2]}]    
set_property PACKAGE_PIN W13 [get_ports {num1[3]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[3]}]
set_property PACKAGE_PIN V2 [get_ports {num1[4]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[4]}]          
set_property PACKAGE_PIN T3 [get_ports {num1[5]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[5]}]
set_property PACKAGE_PIN T2 [get_ports {num1[6]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[6]}]
set_property PACKAGE_PIN R3 [get_ports {num1[7]}]                    
        set_property IOSTANDARD LVCMOS33 [get_ports {num1[7]}]
            set_property PACKAGE_PIN W7 [get_ports {seg[6]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[6]}]
set_property PACKAGE_PIN W6 [get_ports {seg[5]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[5]}]
set_property PACKAGE_PIN U8 [get_ports {seg[4]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[4]}]
set_property PACKAGE_PIN V8 [get_ports {seg[3]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[3]}]
set_property PACKAGE_PIN U5 [get_ports {seg[2]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[2]}]
set_property PACKAGE_PIN V5 [get_ports {seg[1]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[1]}]
set_property PACKAGE_PIN U7 [get_ports {seg[0]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {seg[0]}]
    set_property PACKAGE_PIN U2 [get_ports {ans[0]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {ans[0]}]
set_property PACKAGE_PIN U4 [get_ports {ans[1]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {ans[1]}]
set_property PACKAGE_PIN V4 [get_ports {ans[2]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {ans[2]}]
set_property PACKAGE_PIN W4 [get_ports {ans[3]}]                    
    set_property IOSTANDARD LVCMOS33 [get_ports {ans[3]}]
set_property PACKAGE_PIN U18 [get_ports rst]                        
        set_property IOSTANDARD LVCMOS33 [get_ports rst]

3.综合，执行，生成比特流文件。

4.打开硬件管理器，连接电路板，将代码加载到板子上。

5.观察板子上数码管效果。（图片光线较差，见谅）

加法：

 减法：

 或运算：

 其他可自己试验。