Connecting Ethernet PHY via RMII seems like the way to go as there are less wires and less clocks from the PHY.
So did I think.. until I had this on my desk (Artix A200T fresh from oven):
Starting Vivado, click click click.. Exporting to SDK, click...
Starting lwIP based Echo Server. No Echo. No nothing.
Enabling all possible software debug settings..
Nothing.. Echo server starts and nothing after that.
Stepping back to simpler test, starting Xilinx peripheral test that does PHY loop-back. Connecting Artix to PC using USB Ethernet Adapter. Starting peripheral test. Link goes down. And does not come back. Connecting DSO to RJ45 to SMA break out board and what I see?
Continuous MLT-3 encoded transmit data-streams with no gaps alternating with about 2 seconds interval on RX and TX pairs!
Consulting TLK106 datasheet: MII loopback is available in MII mode.
So?
Consulting TLK106 datasheet again: MII loopback is available in MII mode.
MII or RMII? That is the question. I have read this before but I assumed that MII refers to MII or RMII
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