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DP83640芯片运行相关问题

Other Parts Discussed in Thread: DP83640

买了两块83640的评估版,用STM32控制的1588主从时钟,一切都还顺利,可以正常运行对时

但是自己用TI给的83640的原理图画了PCB,去掉了一些功能之后做板子,再用32就控制不了,时钟芯片都不能运行了

请问是什么问题 ,附一个原理图

RXD3的下拉电阻是现在的PCB上没有的,是后来加的snlc020.pdf