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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1312671/faq-dp83tc812s-q1-my-phy-won-t-link-up
链路状态显示在寄存器0x1位[2]中。 许多问题都可能导致链路无法显示为正常。 请参阅以下调试指南、其中介绍了几个可能的原因和修复方法。 具体请参阅第4.7节。
https://www.ti.com/lit/ug/snla431/snla431.pdf
