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Ethernet PHY register access problem with T2080 (EMI2)

Question asked by Ammasi Kani V on May 18, 2016
Latest reply on May 19, 2016 by alexander.yakovlev

Hi everyone, i am using T2080 processor. As per T2080 datasheet recommendation (attached image for the reference), i am connecting MDIO & MDC pins fo T2080 EMI2 controller to 1.2V with recommended Pull up resistor values. But i am connecting 1.8V VDDO level ethernet transceiver to my T2080 EMI2 controller. With this design, i am not able access the phy register of my ethernet transceiver. I am suspecting that the voltage level of T2080 EMI2 (1.2V) is not compatible with my ethernet transceiver which is having VDDO level of 1.8V. Kindly clarify that Is it possible to connect 1.8V (with require Pull up  value) to T2080 EMI2 controller? Please suggest on this issue... Thanks in advance.

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