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Dsp8148和88e1111通信异常问题

做了一块板子,dsp8148通过rgmii和88e1111连接,phy芯片硬件link完全正常识别10/100/1000M,

但和上位机无法通信,发现将rxclk上的串接电阻从原来的33欧姆改为200或者300欧姆时,十兆和百兆模式可以ping通,但是千兆始终不行,有没有大神见过这种现象的,求解