■ Feedback path Use to feedback the output to the input of the state machine case present state IS when idle =>if (serial in=0)then present state <=state0 else present state dle en Copyright 1997 Altera Corporation 2/22/2021P7 favaraCopyright © 1997 Altera Corporation 2/22/2021 P.7 ◼ Feedback Path – Use to feedback the output to the input of the state machine case present_state is when idle => if (serial_in = '0') then present_state <= state0; else present_state <= idle; end if;