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DP83848I: DP83848I的配置前提条件

Part Number: DP83848I

测试中发现一块单板DP83848 SOC无法识别,MDC接口未发出配置信号一直处于高电平状态,交叉验证soc主板是ok的,更换DP83848也无效,请帮忙回复下如下问题:

(1)soc识别DP83848外置phy需要什么条件?

(2)soc通过mdc接口去配置phy芯片,是在已经识别到外置phy DP83848并且驱动加载ok的情况下吗?