VHDL的很多的小例子，绝对都是正确的，是一本VHDL书上的在网上给出的例子，作者我忘了，书名叫VHDL语言与电路设计大概是-VHDL many small examples are absolutely correct, a VHDL book on-line examples given, the writer I forgot entitled VHDL language and circuit design is probably