简单的逻辑运算VHDL程序，内含具体的程序要求。对同一种逻辑功能运算做dataflow 和 behavior 两种不同的形式的编程，适于初学者对比学习，了解VHDL运算环境-Simple logic operations VHDL program containing specific procedural requirements. Right to do the same kind of logic function computing dataflow and behavior of tw