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lmk04828的spi接口为何没有回读?

Other Parts Discussed in Thread: LMK04828, USB2ANY

大家好!我在使用lmk04828evm开发板,自己使用外部的fpga板输入spi的三线进行lmk04828的寄存器读写,spi读写时序严格按照lmk04828的datasheet来的,fpga的sdio设置为双向管脚,现在的问题是为什么每次我写一次寄存器,或几毫秒再读这个寄存器,总是没有回读信号呢,示波器显示为高阻,如图所示的后8bit,郁闷很久了,希望高手点拨下,感谢!!