P6-12-1 8bit 暫存器 (含KEY_ DELAY )

P6-12-1 8bit D FF 暫存器 (含KEY_ DELAY )

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;


 always @ (posedge CLOCK_50)

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

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

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

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


 end
   
endmodule