哪位大神帮忙用vhdl语言 用if语句实现十选一数据选择器

LIBRARY IEEE; USE IEEE.Std_logic_1164.ALL; ENTITY mux_10_1 IS PORT(sel: IN Std_logic_vector(3 DOWNTO 0); in_arr: IN Std_logic_vector(9 DOWNTO 0); y: OUT Std_logic); END mux_4_1; ARCHITECTURE beh