can someone help on this

Hi Tricky, Thanks for the fast reply, probably now i have got into the locked or unlocked states, do you mind checking out the combinational process:

-- Combinational Process

Process(Current_State, key_0, key_1, key_2, key_3)

begin

LEDG <= "00"; LEDR <= "00";

case Current_State is

when closed =>

if ( key_0 = '1' ) then

Next_State <= closed;

LEDG <= "01"; LEDR <= "01";

else

Next_State <= locked;

LEDG <= "10"; LEDR <= "10";

end if;

when opened =>

if ( key_1 = '1' ) then

Next_State <= opened;

LEDG <= "10"; LEDR <= "10";

else

Next_State <= unlocked;

LEDG <= "01"; LEDR <= "01";

end if;

when locked =>

if ( key_2 = '1' ) then

Next_State <= opened ;

LEDG <= "10"; LEDR <= "10";

else

Next_State <= unlocked;

LEDG <= "11"; LEDR <= "11";

end if;

when unlocked =>

if (key_3 = '1' ) then

Next_State <= unlocked;

LEDG <= "11"; LEDR <= "11";

else

Next_State <= closed;

LEDG <= "10"; LEDR <= "11";

end if;

end case;

end process;

end Behavioral;