我用VHDL写个4选1多路选择器，用MAX+PLUS的，老是报错，大家帮我看看呀。谢谢大家。
library ieee;
use ieee.std_logic_1164.all;
entity mux41 is
port ( s1,s0,a,b,c,d: in std_logic;
y: out std_logic);
end entity mux41;
architecture one of mux41 is
signal H1,H0: std_logic_vector(1 to 0);
begin
process (H1,H0)
begin
if H1='0' and H0='0' then y <= a;
end if;
if H1='0' and H0='1' then y <= b;
end if;
if H1='1' and H0='0' then y <= c;
end if;
if H1='1' and H0='1' then y <= d;
end if ;
end process;
end architecture one;
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