此例程是基于FPGA的USB控制器实例，主要功能为通过FPGA芯片控制USB芯片，实现开发板和PC机之间的USB接口数据通信，来模拟一个硬件加密设备的功能。用Verilog语言实现。-This routine is an instance of the USB controller based on FPGA, the main function is to control USB chip by the FPGA chip, implement the USB interface for da
