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DP83848K: MDIO signal can not match with datasheet showed in figure 6 -2

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Part Number:DP83848K

Dears,

   I have a problem when I want to read PHY register(02H,Identifier Register 1) through MDIO with RMII mode. MDC clock is 16.67MHz.

the Figure 6-2 shows that 

It means "Z0" during the first bit of Turnaround, but I receive "11" during my testing showed as below,

please give me a hand for some reason maybe, thanks a lot.


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