`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date:    01:56:55 11/12/2015
// Design Name:
// Module Name:    rotary_glitech
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module rotary_glitech(
    input ROT_X,
    output reg ROT_X_FREE,
    input rst
    );

        parameter
            zero = 2'd0,
            wait_one = 2'd1,
            one = 2'd2,
            wait_zero = 2'd3;

        reg[1:0] state = 2'b00;

        always@(posedge rst) begin
                ROT_X_FREE = 1'b0;
                state = zero;
        end

        always@* begin
            case(state)
                zero:
                    begin
                        ROT_X_FREE <= 0;
                        state <= wait_one;
                    end
                wait_one:
                    begin
                        #10
                        if(!ROT_X)
                            state = zero;
                        else
                            state = one;
                    end
                one:
                    begin
                        ROT_X_FREE = 1;
                        state = wait_zero;
                    end
                wait_zero:
                    begin
                        #10
                        if(!ROT_X)
                        state = zero;
                    end
            endcase

        end

endmodule