如何使用VHDL为具有n条选择线的1到2^n输出解复用器设置实体？

entity demux is
    generic (
        n : integer := 2
    );
    port (
        select : in std_logic_vector(n-1 downto 0);
        data_in : in std_logic;
        data_out : out std_logic_vector(2**n-1 downto 0)
    );
end entity demux;

architecture behavioral of demux is
begin
    process(select, data_in)
    begin
        case select is
            when "00" =>
                data_out <= "1" & not data_in & "0" & not data_in;
            when "01" =>
                data_out <= "0" & data_in & "0" & not data_in;
            when "10" =>
                data_out <= "0" & not data_in & "1" & not data_in;
            when "11" =>
                data_out <= "0" & not data_in & "0" & data_in;
            when others =>
                data_out <= (others => '0');
        end case;
    end process;
end architecture behavioral;