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设计一个板卡,用AM3352 + DP83822来是实现网口通信,但DP83822 时钟不能Link,是否DP83822必须通过AM3352 配置后才能Link,或是DP83822 的硬件设计问题?用的外部时钟是25M 晶振。
那要看是使用的是MII接口还是RMII接口,如果采用MII接口,则需外部25Mhz晶振。如果采用RMII接口,那么RMII reference clock需要50Mhz时钟。