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MDIO read and write failed

Keldy
Expert 1835 points
Other Parts Discussed in Thread: AM3359

hi,

i'm using AM3359 MPU in my custom board, amd come out with the problem that, sometime the MDIO can read and write to phy register successfully, and sometime it will failed. When failed, reset the board several times, it will work properly again.

once the MDIO can function properly, it will never failed until i turn off the board. so i think it was not the temperature problem.

When the MDIO failed, i measure the MDIO_data and MDIO_clk, the signal pattern same as the signal pattern while the MDIO working properly.

This problem happen in random way.

What will cause the MDIO fail ?

will the MDIO_CLK is the issue?

i use gpio pin to control the phy reset. will the reset be the issue?

Thanks & Regards

Keldy