DP83TD510E-EVM: USB-2-MDIO Tool detects all PHY IDs and returns FFFF

Hi,

I recently received the DP83TD510E Eval-Board. After I made the R24=0Ohms mod, I was able to connect over USB to the Board and power it only through the USB-Port.

When I try to read or write registers through the SMI-Interface, I can access the Registers of the DP83TD510 PHY without any problems (see picture below).

But when I try to read any registers in the DP83822 with the PHY ID set to "05" it always returns "FFFF", no matter what I do (see picture below). I also tried to power the board through the J12-Terminal, which gave the same results.

Another wired thing is, if I run the "Find PHY ID" command, it tells that it found on all IDs a working PHY, which is not the case. The datasheet of the board says there should be only one on PHY the ID "0" (DP83TD510E) and one PHY on the ID "5" (DP83822). 

Further informations:

- When powered over USB following LEDs are on: D3, D15, LD1, LD2, LD4

- Board is Rev. 2

- R24 is replaced by 0Ohms

- No Ethernet-Cables connected

Any help will be appreciated.

Thank you very much!

Moritz