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AM335x通过GPMC口与FPGA异步通信,能够正确的由FPGA读数据,但是FPGA却接收不到ARM写入的数据

如题,请问这是为什么啊?片选信号和写有效信号都是有的,但是FPGA就是没有接收到ARM写入的数据。但是ARM却能接收到由FPGA读的数据!请帮忙指点一下是什么原因,我需要更改哪里!谢谢