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> Due to the complexity of the signalling involved with ethernet, a dedicated ASIC is generally used, which takes in data at the frame level, and takes care of wiggling the electrical lines in the right way over a cable (though there are of course exceptions).

Like others in this thread I was hoping I’d see an RJ45 breakout board directly hooked into an STM32 and doing onerous bit banging and keeping it as low level and basic as possible.




Author here. CNLohr already did it better than I could 10+ years ago: https://www.youtube.com/watch?v=mwcvElQS-hM




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