运算器的实现，即实验指导书中的实验一，文件中包含有原代码及端口设置（可变），用vrilog HDL编程，Xilinx ISE 6仿真，并在实际电路中得到实现．-operations for the realization of the experimental guidance of a book. document contains the original code and port settings (variable), with vrilog HDL programming, Xili