module pro_dec5 (clk, reset, initial_speed, ref_speed, out_speed);
  input         clk;
  input         reset;
  input  [15:0] initial_speed;      // speed yang kene ikut ref
  input  [15:0] ref_speed;          // speed apa yang kita nak
  output [15:0] out_speed;
  
  reg [15:0]  out_speed;
  reg [15:0]  sig_speed;
  
  always @(reset or initial_speed)
    begin
      if (reset == 1'b0)
        out_speed = 16'b0000000000000000;
      else
        sig_speed = initial_speed;
    end
  
  always @ (clk or reset)
    begin 
      if (reset == 1'b0)
        begin
          out_speed = 16'b0000000000000000;
        end
      else     
        begin
          if (sig_speed == ref_speed)
            begin
              out_speed <= sig_speed; //out_speed <= initial_speed
            end
          else if (sig_speed < ref_speed)
            begin
              out_speed <= sig_speed; //sig_speed = 16'b0000000000000000;
            end
          else
            sig_speed <= sig_speed - 1;
        end            
     end 
  
endmodule