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ds90ub947和ds90ub948配合使用，使用过程中出现黑屏，
对比正常情况只有0x3b寄存器存在差异，规格书上没有0x3b寄存器的说明，
0x3b寄存器是做什么用的，是否可以作为判断异常的依据？
DS90UB948的数据手册中没有列出0X3B的寄存器内容，可以参考928的数据手册中0X3B的寄存器定义，为 Adaptive EQ Status。
Equalizer StatusCurrent equalizer level set by AEQ or Override Register
