Hi,

is the GPIO use of ETH0 or ETH1 pins somehow possible if only one LAN port is necessary?

Michael

Per chapter "1.3 Pin Sharing Scheme" of the RT3050 data sheet, that's not possible.

These are the pin of the 5 port PHY interface. As far a I understand, Ethernet PHY signals are electrically not compatible to (3V3) TTL signals, so it would take quite some additional hardware to make those pins selectable as GPIOs. At least I have not yet seen a controller with on-chip PHY where the Ethernet pins could be changed to GPIOs (that only works for the RMII/GMII signal that go to an external PHY). However, I would not exclude that there are exceptions

regards

Bernhard

BTW.: if you need additional GPIOs, some of the JTAG pins can be programmed as GPIOs:

JTAG_TRST_N = GPIO21
JTAG_TCLK = GPIO20
JTAG_TMS = GPIO19
JTAG_TDI = GPIO18
JTAG_TDO = GPIO17

Please check the below link for the location:
viewtopic.php?f=6&t=35#p202

regards

Bernhard