EEPW论坛

entity tri_bus is port( iobus : inout std_logic; din : in std_logic; dout : in std_logic; out_en : in std_logic ); end tri_bus; architecture arch_tri_bus of tri_bus is begin din <= iobus; iobus <= dout when out_en = '1' else 'Z'; end arch_tri_bus;