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求助,DS92LX1621/22通信问题

现在电路板上用的1621发送,1622接收,按照手册上原理图推荐的方式画的,两个芯片的PD脚都拉高,都是正常工作的,I2C也都能通信,但是数据传输不了。我用I2C查询1621的0x0c寄存器,已经检测到发送时钟,但是线缆连接的bit一直都是0,求助,是不是我还需要配置什么,谢谢