Design of 2 to 4 Decoder using IF-ELSE Statement (VHDL Code).

Design of 2 to 4 DECODER using IF-ELSE Statements (Behavior Modeling Style).

Output Waveform :   2 to 4 Decoder

VHDL Code -


-------------------------------------------------------------------------------
--
-- Title       : decoder2_4
-- Design      : vhdl_upload 1
-- Author      : Naresh Singh Dobal
-- Company     : nsdobal@gmail.com
-- VHDL Tutorials & exercise by Naresh Singh Dobal
-------------------------------------------------------------------------------
--
-- File        : 2 to 4 decoder using if else.vhd

   

library IEEE;
use IEEE.STD_LOGIC_1164.all;

entity decoder2_4 is
     port(
         din : in STD_LOGIC_VECTOR(1 downto 0);
         dout : out STD_LOGIC_VECTOR(3 downto 0)
         );
end decoder2_4;


architecture decoder2_4_arc of decoder2_4 is
begin

    encoder : process (din) is
    begin
        if (din="00") then
            dout <= "1000";
        elsif (din="01") then
            dout <= "0100";
        elsif (din="10") then
            dout <= "0010";
        else
            dout <= "0001";
        end if;
    end process encoder;    

end decoder2_4_arc;