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DS90UB949-Q1EVM: DS90UB949和DS90UB926的IIC通信问题

Part Number: DS90UB949-Q1EVM

通过串行器DS90UB949端读写IIC,DS90UB926端的IIC引脚上没有检测到IIC的波形。DS90UB926的IIC输出默认是没有关闭的么?需要做什么配置让IIC数据能够从串行器透传到解串器输出?