基于Verilog HDL实现将十进制的reg变量count显示在6个七段数码管上

下面是一个简单的Verilog HDL代码，可以将一个reg类型的十进制变量count显示在6个七段数码管上。

module seven_seg_decoder(
    input [3:0] in,
    output reg [6:0] out
);

always @(*) begin
    case (in)
        4'd0: out = 7'b1000000;
        4'd1: out = 7'b1111001;
        4'd2: out = 7'b0100100;
        4'd3: out = 7'b0110000;
        4'd4: out = 7'b0011001;
        4'd5: out = 7'b0010010;
        4'd6: out = 7'b0000010;
        4'd7: out = 7'b1111000;
        4'd8: out = 7'b0000000;
        4'd9: out = 7'b0010000;
        default: out = 7'b1111111;
    endcase
end

endmodule


module seven_seg_display(
    input wire clk,
    input wire rst,
    input wire [31:0] count,
    output reg [5:0] seg,
    output reg [3:0] an
);

reg [3:0] digit;
reg [6:0] decoder_out;

assign seg = decoder_out;
assign an = ~digit;

always @(posedge clk, posedge rst) begin
    if (rst) begin
        digit <= 4'b0000;
        decoder_out <= 7'b1111111;
    end else begin
        if (digit == 4'b0111) begin
            digit <= 4'b0000;
        end else begin
            digit <= digit + 1;
        end
    end
end

always @(posedge clk) begin
    decoder_out <= seven_seg_decoder[count % 10];
    count <= count / 10;
end

endmodule


module top(
    input wire clk,
    input wire rst,
    output reg [5:0] seg,
    output reg [3:0] an
);

reg [31:0] count;

seven_seg_display display(
    .clk(clk),
    .rst(rst),
    .count(count),
    .seg(seg),
    .an(an)
);

always @(posedge clk) begin
    count <= count + 1;
end

endmodule

该代码包括两个模块：seven_seg_decoder和seven_seg_display。seven_seg_decoder模块将4位二进制输入转换为7位七段数码管的输出。seven_seg_display模块包括一个计数器，用于计算要显示的十进制数字，并将其转换为七段数码管的输入。最后，在顶层模块中，将计数器的值传递给seven_seg_display模块，并通过输出端口seg和an将七段数码管的信号发送到外部硬件。