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AM335x DDR PHY寄存器问题



本人通用读取寄存器值的方法校验设置是否正确,发现AM335x 的DDR PHY寄存器设置写入后,再读取返回值都是0,

其他寄存器如EMIF4D的均是正确与设置值相符; DDR PHY寄存器均为0 参考datasheet的7.3.6章节, 基地址为0x44E12000

该寄存器的type写的是RW, 请问是什么原因导致设置寄存器后读取的值却为0;