制作通用的vhdl解码器

Question

我正在尝试在VHDL中制作通用解码器，但是当我尝试对其进行写入时，Decoderout输出出现了问题。我收到错误Error (10028): Can't resolve multiple constant drivers for net "decoder_output[n]" at decoder_generic.vhd(20)。我该如何解决这个问题？

LIBRARY ieee;
USE ieee.std_logic_1164.all; 
use ieee.numeric_std.all;

entity decoder_generic is 
generic(
            n : positive := 4  -- amount of registers
            );

port(
    Decoderin : in std_logic_vector(n-1 downto 0);
    Decoderout: out std_logic_vector(2**n-1 downto 0)
);
end decoder_generic;


architecture archdecoder_generic of decoder_generic is
begin
    Decoderout <= (others => '0'); -- default
    Decoderout(to_integer(unsigned(Decoderin))) <= '1';
end archdecoder_generic;