I use the DP83TG720S-Q1, have the same problem,PSD is fail at about 400MHz.
Is there any Reg to solve it? such as Improve the MDI's driving ability.
I have read DP83TG720S-Q1‘s datasheet and SNLA371,just find two points as below. These way just for CLKOUT and RGMII pads.
For MDI, there is not mentioned.
Thanks & Best regards
shuai