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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity multiplexer is
Port (

    din:in STD_LOGIC_VECTOR (7 downto 0);
   sel:in STD_LOGIC_VECTOR (2 downto 0);
   dout : out STD_LOGIC);
end multiplexer;

architecture Behavioral of multiplexer is
begin
    process (din,sel)
    begin
      case sel is
           when\"000\"=> dout <= din(7);
           when\"001\"=> dout <= din(6);
           when\"010\"=> dout <= din(5);
           when\"011\"=> dout <= din(4);
           when\"100\"=> dout <= din(3);
           when\"101\"=> dout <= din(2);
           when\"110\"=> dout <= din(1);
           when\"111\"=> dout <= din(0);
           whenothers=> dout <= din(0);
      end case;
end process;
end Behavioral;

TEST BENCH:

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.std_logic_unsigned.all;
USE ieee.numeric_std.ALL;

ENTITY tb_multiplexer_vhd IS
END tb_multiplexer_vhd;

ARCHITECTURE behavior OF tb_multiplexer_vhd IS

-- Component Declaration for the Unit Under Test (UUT)
COMPONENT multiplexer
PORT(
din :IN std_logic_vector(7 downto 0);
sel:IN std_logic_vector(2 downto 0);
dout :OUT std_logic
);
END COMPONENT;

--Inputs
SIGNAL din : std_logic_vector(7 downto 0) :=(others=>'0');
SIGNAL sel : std_logic_vector(2 downto 0) :=(others=>'0');

--Outputs
SIGNAL dout : std_logic;

BEGIN

-- Instantiate the Unit Under Test (UUT)
uut: multiplexer PORT MAP(din => din,
sel => sel,
dout => dout
);

process

         din<=\"10100011\"; wait for 10ns;

         sel<= \"000\";wait for 10ns,

         sel<= \"001\";wait for 10ns,

         sel<= \"010\";wait for 10ns,

         sel<= \"011\";wait for 10ns,

         sel<= \"100\";wait for 10ns,

         sel<= \"101\";wait for 10ns,

         sel<= \"110\";wait for 10ns,

         sel<= \"111\";wait for 10ns,

        wait;

end process

END;