spi接口，DSP发送数据，FPGA缓存起来，然后通过spi口写进fm25h20芯片里面-Spi interface, DSP send data, FPGA, and then through the spi cache up mouth written into fm25h20 chip inside

fpga与DSP通过emif接口通信，fpga内部通过fifo进行数据缓存-fpga with the DSP through emif interface communication, fpga internal data cache by fifo