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DS90UB927Q-Q1: 和DS90UB948 I2C通讯问题

Part Number: DS90UB927Q-Q1

如图方案,目前948后面的I2C没有传输数据,但是948可以通过FPLINK进行读取其寄存器的值,这个是哪里有问题呢,我需要从哪里check呢?