Bit banged 100 MBit/s Ethernet transmission on RPi Pico

I love the idea of replacing an Ethernet card with a microcontroller where Ethernet is implemented as open-source software using signal paths off the microcontroller's GPIO...

Another great option would be to use an FPGA, ideally a Lattice iCE40 (https://prjicestorm.readthedocs.io/en/latest/) -- or other FPGA with a completely open toolchain...

Cool project.

>Warning: Do not connect to any POE capable equipment!

What's the deal with this? I thought POE hardware always needed to "detect" attached POE capable devices before sending power.

That being said, my ubiquiti POE switch somehow managed to brick the ethernet port on my 1st gen Nvidia Shield so maybe it isn't that safe...