快速掌握verilog实例化分享程序，对于使用verilog编写的固件，需要功能划分，体现实例化的用处，便于归档提取，以备再次使用(Quickly grasp the Verilog instantiation sharing program, for the use of Verilog firmware, the need for functional division, to reflect the usefulness of instantiation, easy to archive