EZ-USB FX3 与FPGA通讯官方例程，包括了短包发送，ZLP发送，LoopBack例程，包括完整的GPIF设计，代码和开发文档-EZ-USB FX3 and FPGA communications official routines, including a short packet is sent, ZLP send, LoopBack routines, including complete GPIF design, code and development documentatio