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ARP packets come and are decoded as well? So this thing must actually work? I check my own PC's IP address and adjust the local IP for the echo responder code.

ping!

< 1 ms

It does work.

So why did take so long to make it work? Maybe because I was looking at existing reference designs for too long. Digilent Nexys4 RMII PHY but I was not able to find any reference designs at Digilent website. Then as second option there is Artix based board from Avnet with RMII PHY, but it has only been launched and the support materials are not yet online. I found also one Lattice XO2 based board that has RMII PHY and promises "source code" but in the install archive are only JEDEC files. So all my search for any FPGA example code for RMII PYH's ended up in void.