P6-6-2 計數器的基礎 適用於DE2-70

P6-6-2 計數器的基礎 適用於DE2-70

reg [3:0] Count_inc
reg [3:0] Count_dec

always @ (posedge CLOCK_50)
begin
      Count_inc  = Count_inc + 4'b1;
      Count_dec = Count_dec - 4'b1;
end

module Dff_KEYdelay(CLOCK_50,KEY,LEDG);

 input CLOCK_50; //Clock 50MHZ
 input [3:0] KEY;
 output reg [7:0] LEDG;  

 reg [3:0] key_delay0;
 reg [3:0] key_delay1;
 reg [27:0] Counter_inc ;


 always @ (posedge CLOCK_50)

 begin
  if (!key_delay0[3] && key_delay0[2]) //KEY[0] = Counter_inc[27]
LEDG[0]<= ~LEDG[0];

  if (!key_delay1[3] && key_delay1[2]) //KEY[1]  = Counter_inc[25]
LEDG[7:1]<= LEDG[6:0];  //Shift left 

   key_delay0 <= { key_delay0[2:0],Counter_inc[27]};   //delay for KEY[0]

   key_delay1 <= { key_delay1[2:0],Counter_inc[25]};   //delay for KEY[1]

   Counter_inc = Counter_inc + 28'b1;


 end
   
endmodule