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LAN8710A-EZC匹配电路问题



先生/女士:

你好,最近用LAN8710A-EZC芯片绘制了一个小电路板 ,上电后RJ45的黄灯和绿灯就亮起,但此时并未连接网线;插上网线后RJ45的灯仍是亮的状态,但是无法连接网,25MHz时钟正常,电源正常,请问原因可能是哪里?难道是匹配电路有问题吗?原理图如下: