debounce.v

自动售货机的程序

module debounce(clk,key_in,key_out);

input clk;
input[key_width-1:0] key_in;
output[key_width-1:0] key_out;

reg[key_width-1:0] dout1,dout2,dout3;

parameter key_width;

assign key_out= dout1 | dout2 | dout3;

always@(posedge clk)
begin
	  dout1 <= key_in;
	  dout2 <= dout1;
	  dout3 <= dout2;
end

endmodule