4 bit UpDown Counter Verilog Code

                                     4 bit UpDown Counter

Verilog Code

module BCDupdown(Clk, reset, UpOrDown, Count ); // module Declaration
    // input and output declarations
input Clk,reset,UpOrDown;
    output [3 : 0] Count;
    reg [3 : 0] Count = 0; 
   
     always @(posedge(Clk),UpOrDown)
     begin
        if(reset == 1)
            Count <= 0;
        else
            begin
            if(UpOrDown == 1)   // High for Up Counter and Low for Down Counter
                begin
                if(Count == 15)
                    Count <= 0;
                else
                    Count <= Count + 1;
                end
            else
                begin
                if(Count == 0)
                    Count <= 15;
                else
                    Count <= Count - 1;
                end
            end
     end   
   
endmodule

Test Bench Code

 module BCDUPDOWNTB;

    // Inputs
    reg Clk;
    reg reset;
    reg UpOrDown;

    // Outputs
    wire [3:0] Count;

    // Instantiate the Unit Under Test (UUT)
    BCDupdown uut (
        .Clk(Clk),
        .reset(reset),
        .UpOrDown(UpOrDown),
        .Count(Count)
    );
 initial Clk = 0;
    always #100 Clk = ~Clk;

    initial begin
        // Initialize Inputs
        Clk = 0;
        reset = 0;
        UpOrDown = 0;

        // Wait 100 ns for global reset to finish
        #100;
        UpOrDown = 0;
       
        // Add stimulus here

    end
     
endmodule
 

Soon We will Provide Output Pics also