1. 掌握比较器的逻辑功能和工作原理； 2. 进一步熟悉 ISE 的工作环境及操作，练习用VHDL 语言编写比较器程序。-1 master comparator logic functions and working principle 2 more familiar with the ISE work environment and operations, exercises using VHDL language comparator procedures.