Error (10327):VHDL error at xd.vhd(17):can't determine definition of operator ""+"" -- found 0 pos初学VHDL~LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY xd ISPORT (sel :IN std_logic;d0,d1 :IN std_logic;led :OUT std_logic);END ENTITY xd;ARCHITECTU
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