module fsm3
(input clk, reset, c,
 output reg [3:0] salida);

  reg [1:0] status;  // estado

// bloque secuencial
always @(posedge clk or negedge reset)
  if (!reset) status <= 0;
  else case (status)
    0: if (c) status <= 1;
    1: status <= 2;
    2: if (c) status <= 1;
  endcase

// bloque combinacional
always @(status)
  case (status)
    0: salida <= 3'b010;
    1: salida <= 3'b100;
    2: salida <= 3'b111;
    default: salida <= 3'bxxx;
  endcase

endmodule // fsm3