module key_press(input logic Clk, input logic Reset, input logic hold, input logic [7:0] keycode, output logic [7:0] key);

enum logic [5:0] {Unpressed, Pressed, Hold_Down} Next_state, State;

always_ff @ (posedge Clk)

begin

if(Reset)

State <= Unpressed;

else

State <= Next_state;

end

always_comb

begin

Next_state = State;

unique case(State)

Unpressed:

if(hold)

Next_state = Hold_Down;

else if(keycode)

Next_state = Pressed;

Pressed:

if(hold)

Next_state = Hold_Down;

else if(keycode == 8'b0)

Next_state = Unpressed;

Hold_Down:

if(hold == 1'b0)

Next_state = Pressed;

endcase

case(State)

Unpressed:

key = keycode;

Pressed:

key = 8'b0;

Hold_Down:

key = keycode;

endcase

end