HDLBit 四位十进制BCD码计数器

题目：四位十进制BCD码计数器

题目要求为输出一个16bit数，每四位为一个BCD码，从高位至低位每位BCD码分别为十进制的千位，百位，十位，个位。

module top_module (
    input clk,
    input reset,   // Synchronous active-high reset
    output [3:1] ena,
    output [15:0] q);
    
    reg [3:0]	ones;
    reg [3:0]	tens;
    reg [3:0]	hundreds;
    reg [3:0]	thousands;
    
    always@(posedge clk)begin
        if(reset)begin
            ones <= 4'd0;
        end
        else if(ones == 4'd9)begin
            ones <= 4'd0;
        end
        else begin
            ones <= ones + 1'b1;
        end
    end
    
    always@(posedge clk)begin
        if(reset)begin
            tens <= 4'd0;
        end
        else if(tens == 4'd9 && ones == 4'd9)begin
            tens <= 4'd0;
        end
        else if(ones == 4'd9) begin
            tens <= tens + 1'b1;
        end
    end
    
    always@(posedge clk)begin
        if(reset)begin
            hundreds <= 4'd0;
        end
        else if(hundreds == 4'd9 && tens == 4'd9 && ones == 4'd9)begin
            hundreds <= 4'd0;
        end
        else if(tens == 4'd9 && ones == 4'd9) begin
            hundreds <= hundreds + 1'b1;
        end
    end
    
    always@(posedge clk)begin
        if(reset)begin
            thousands <= 4'd0;
        end
        else if(thousands == 4'd9 && hundreds == 4'd9 && tens == 4'd9 && ones == 4'd9)begin
            thousands <= 4'd0;
        end
        else if(hundreds == 4'd9 && tens == 4'd9 && ones == 4'd9) begin
            thousands <= thousands + 1'b1;
        end
    end
    
    assign q = {thousands, hundreds, tens, ones};
    assign ena[1] = (ones == 4'd9) ? 1'b1 : 1'b0;
    assign ena[2] = (tens == 4'd9 && ones == 4'd9) ? 1'b1 : 1'b0;
    assign ena[3] = (hundreds == 4'd9 && tens == 4'd9 && ones == 4'd9) ? 1'b1 : 1'b0;
 
endmodule

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