Program to create 1:4 Demultiplexer using VHDL.

--Program to create 1 to 4 Demultiplexer using VHDL.

library IEEE;

use IEEE.STD_LOGIC_1164.all;

entity demux_1_4 is

port(

din : in STD_LOGIC;

sel : in STD_LOGIC_VECTOR(1 downto 0);

dout : out STD_LOGIC_VECTOR(3 downto 0)

);

end demux_1_4;

architecture demultiplexer_case_arc of demux_1_4 is

begin

demux : process (din,sel) is

begin

case sel is

when "00" => dout <= din & "000";

when "01" => dout <= '0' & din & "00";

when "10" => dout <= "00" & din & '0';

when others => dout <= "000" & din;

end case;

end process demux;

end demultiplexer_case_arc;

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VHDL Program to implement 1:4 DeMultiplexer using Case statement.

--VHDL Program to implement 1 to 4 DeMultiplexer using Case statement.

library IEEE;
use IEEE.STD_LOGIC_1164.all;
entity demultiplexer_case is
port(
din : in STD_LOGIC;
sel : in STD_LOGIC_VECTOR(1 downto 0);
dout : out STD_LOGIC_VECTOR(3 downto 0)
);
end demultiplexer_case;
architecture demultiplexer_case_arc of demultiplexer_case is
begin
demux : process (din,sel) is
begin
case sel is
when "00" => dout <= din & "000";
when "01" => dout <= '0' & din & "00";
when "10" => dout <= "00" & din & '0';
when others => dout <= "000" & din;
end case;
end process demux;
end demultiplexer_case_arc;

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VHDL Program to implement 1:4 DeMultiplexer using If-Else statement.

--VHDL Program to implement 1 to 4 DeMultiplexer using If-Else statement.

library IEEE;

use IEEE.STD_LOGIC_1164.all;

entity demultiplexer1_4 is

port(

din : in STD_LOGIC;

sel : in STD_LOGIC_VECTOR(1 downto 0);

dout : out STD_LOGIC_VECTOR (3 downto 0)

);

end demultiplexer1_4;

architecture demultiplexer1_4_arc of demultiplexer1_4 is

begin

demux : process (din,sel) is

begin

if (sel="00") then

dout <= din & "000";

elsif (sel="01") then

dout <= '0' & din & "00";

elsif (sel="10") then

dout <= "00" & din & '0';

else

dout <= "000" & din;

end if;

end process demux;

end demultiplexer1_4_arc;

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