74x148 Behavioural Model using if statement

74x148     Behavioral model using if – else statement

library IEEE;

use IEEE.std_logic_1164.all;

entity enc74x148 is

port (EI_L: in             STD_LOGIC;

        I_L: in STD_LOGIC_VECTOR (7 downto 0);

        A_L: out             STD_LOGIC_VECTOR (2 downto 0);

        EO_L, GS_L:     out STD_LOGIC);

end enc74x148;

architecture arch1 of enc74x148 is

begin

     process (EI_L, I_L)

     begin     

            EO_L <= '1';

              GS_L <= '0';

if I_L(7) = '0' then     A_L <= "000";

elsif  I_L(6) = '0' then           A_L <= "001";

elsif  I_L(5) = '0' then           A_L <= "010";

elsif  I_L(4) = '0' then           A_L <= "011";

elsif  I_L(3) = '0' then           A_L <= "100";

elsif  I_L(2) = '0' then           A_L <= "101";

elsif  I_L(1) = '0' then           A_L <= "110";

elsif  I_L(0) = '0' then           A_L <= "111";

else     A_L <= "111";

            EO_L <= '0';

            GS_L <= '1';

end if;

     end process;

end arch1;