// Copyright 2020 Teros Technology
//
// Ismael Perez Rojo
// Carlos Alberto Ruiz Naranjo
// Alfredo Saez
//
// This file is part of Colibri.
//
// Colibri is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Colibri is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Colibri.  If not, see <https://www.gnu.org/licenses/>.

always @(posedge clk or posedge reset)
     begin
          if (reset)
               state = zero;
          else
               case (state)
                    zero:
                         state = one;
                    one:
                         if (in) begin
                              state = zero;
                         else
                              state = two;
                    two:
                         state = three;
                    three:
                         state = zero;
               endcase
     end

endmodule