Why mii RXDV and RXD waveform is not normal?

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I'm debugging rtl8211eg the phy chip on board, I can send data, but has been not normal receiving data. I use the oscilloscope to test waveform of data received and found RXDV haven't encase the RXD signal, could you tell me who encountered this problem?
Waveform diagram is as follows:
Yellow is RXDV signal, RXD signals are shown in green!
 
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