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TMS320F28335 采用xintf与FPGA进行32位数据传输问题。只读取数据的低16位,高16位为零

本人采用28335的xintf接口与FPGA进行32位数据传输,向fpga中写32位数据没有任何问题,但是读取fpga中的32位数据时,发现高16位一直都是零,低16位正确。请问有谁知道这是什么问题吗?