Oh wow, this is was earlier in development than I was expecting. Literally just banging out the bits on the wire for a UDP packet without any underlying protocol support. No CSMA/CA. No ARP. No autonegotiation. Can't even receive. Just enough support to calculate the checksums and do the Manchester encoding before clocking the bits out on the wire.
/CD requires receiving while transmitting, which is probably going to get really complicated in software when trying to precisely time GPIO pulses at .1us intervals on a 133Mhz CPU. Probably need to add an external latch + carrier sense circuit to assert a collision signal.
Side note, I do love the Firesign Theater reference, Mr. Tirebiter.
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Oh wow, this is was earlier in development than I was expecting. Literally just banging out the bits on the wire for a UDP packet without any underlying protocol support. No CSMA/CA. No ARP. No autonegotiation. Can't even receive. Just enough support to calculate the checksums and do the Manchester encoding before clocking the bits out on the wire.
Ahem. CSMA/CD. 10BaseT implies wired connection.
I think I'd rather have such a project report 'early' than wait till it's supporting a web server via those 2 pins...
..because, now, YOU can whip up the Receive end, eh? ;-)
/CD requires receiving while transmitting, which is probably going to get really complicated in software when trying to precisely time GPIO pulses at .1us intervals on a 133Mhz CPU. Probably need to add an external latch + carrier sense circuit to assert a collision signal.
Side note, I do love the Firesign Theater reference, Mr. Tirebiter.