module debounce_button (clk, butin, butout);
        parameter DELAY = 250000;
        input clk, butin;
        output reg butout;
        reg [19:0] count;

        always @(posedge clk)
        begin
                if (butin == 0)
                begin
                        count = (count == 20'b11111_11111_11111_11110) ? 20'b11111_11111_11111_11110 : count + 1;
                        if (count == DELAY)
                                butout = 1;
                        else
                                butout = 0;
                end
                else
                begin
                        count = 0;
                        butout = 0;
                end
        end
endmodule