文件中有两种方法实现并串转换模块代码的编写，可以在modelsim软件中正确仿真(There are two methods in the file to achieve the serial conversion module code writing, can be correctly simulated in Modelsim software)

fpga控制USB接口数据收发，包含verilog 仿真代码和调试工程(fpga control usb3.0, modelsim simulation, verilog language)