基于veriloghdl设计一个四位动态显示电路，要求显示0715

好的，我可以帮助您设计一个基于Verilog HDL的四位动态显示电路，以下是代码示例：

module dynamic_display(
    input clk,          //时钟信号
    input rst,          //复位信号
    output reg [3:0] dig,  //数码管显示输出
    output reg [3:0] sel   //数码管位选信号
);

reg [23:0] counter;    //计数器，用于控制动态显示
reg [3:0] num [3:0];   //存储要显示的数字
parameter [3:0] nums [4] = 4'h0, 4'h7, 4'h1, 4'h5;  //要显示的数字序列

assign sel = {~counter[23], ~counter[22], ~counter[21], ~counter[20]};  //位选信号

always @ (posedge clk or posedge rst) begin
    if (rst) begin      //复位状态
        counter <= 0;
        num <= 4'h0;
        dig <= 4'hff;
    end
    else begin          //正常计数状态
        if (counter == 24'd999999) begin  //计数器达到最大值时重置
            counter <= 0;
        end
        else begin
            counter <= counter + 1;
        end
        //根据计数器值更新要显示的数字
        num[0] <= nums[counter[1:0]];
        num[1] <= nums[counter[3:2]];
        num[2] <= nums[counter[5:4]];
        num[3] <= nums[counter[7:6]];
    end
end

//数码管译码器，将数字转换为对应的数码管段选信号
always @ (*) begin
    case (num[3])
        4'h0: dig[6:0] = 7'b1000000;
        4'h1: dig[6:0] = 7'b1111001;
        4'h2: dig[6:0] = 7'b0100100;
        4'h3: dig[6:0] = 7'b0110000;
        4'h4: dig[6:0] = 7'b0011001;
        4'h5: dig[6:0] = 7'b0010010;
        4'h6: dig[6:0] = 7'b0000010;
        4'h7: dig[6:0] = 7'b1111000;
        4'h8: dig[6:0] = 7'b0000000;
        4'h9: dig[6:0] = 7'b0010000;
        default: dig[6:0] = 7'b1111111;
    endcase
    case (num[2])
        4'h0: dig[13:7] = 7'b1000000;
        4'h1: dig[13:7] = 7'b1111001;
        4'h2: dig[13:7] = 7'b0100100;
        4'h3: dig[13:7] = 7'b0110000;
        4'h4: dig[13:7] = 7'b0011001;
        4'h5: dig[13:7] = 7'b0010010;
        4'h6: dig[13:7] = 7'b0000010;
        4'h7: dig[13:7] = 7'b1111000;
        4'h8: dig[13:7] = 7'b0000000;
        4'h9: dig[13:7] = 7'b0010000;
        default: dig[13:7] = 7'b1111111;
    endcase
    case (num[1])
        4'h0: dig[20:14] = 7'b1000000;
        4'h1: dig[20:14] = 7'b1111001;
        4'h2: dig[20:14] = 7'b0100100;
        4'h3: dig[20:14] = 7'b0110000;
        4'h4: dig[20:14] = 7'b0011001;
        4'h5: dig[20:14] = 7'b0010010;
        4'h6: dig[20:14] = 7'b0000010;
        4'h7: dig[20:14] = 7'b1111000;
        4'h8: dig[20:14] = 7'b0000000;
        4'h9: dig[20:14] = 7'b0010000;
        default: dig[20:14] = 7'b1111111;
    endcase
    case (num[0])
        4'h0: dig[27:21] = 7'b1000000;
        4'h1: dig[27:21] = 7'b1111001;
        4'h2: dig[27:21] = 7'b0100100;
        4'h3: dig[27:21] = 7'b0110000;
        4'h4: dig[27:21] = 7'b0011001;
        4'h5: dig[27:21] = 7'b0010010;
        4'h6: dig[27:21] = 7'b0000010;
        4'h7: dig[27:21] = 7'b1111000;
        4'h8: dig[27:21] = 7'b0000000;
        4'h9: dig[27:21] = 7'b0010000;
        default: dig[27:21] = 7'b1111111;
    endcase
end

endmodule

以上代码实现了一个简单的四位动态显示电路，可以显示数字序列为0715。其中，计数器每个时钟周期加1，当计数器达到最大值时重置为0，根据计数器的值更新要显示的数字，数码管译码器将数字转换为对应的数码管段选信号。