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方便的话,把原理图发上来看看。另外PCB layout上最好标注下具体的MII信号名称,看不清楚。
对于4对发送或4对接收信号,最好分别做到等长。当然所有的MII信号都要做到50Ω的串联串联阻抗,一般建议在走线上串联电阻。
附件我贴了一个关于PHY的layout 指导,你可以参考下,另外你可以看看DP83848,性能非常好。