jeffpc,
@jeffpc@mastodon.radio avatar

I just spent the afternoon reading about PCI bus signaling. This is normal, right?

gsuberland,
@gsuberland@chaos.social avatar

@jeffpc reflected wave signalling is weird lol

jeffpc,
@jeffpc@mastodon.radio avatar

@gsuberland Weird but really clever.

gsuberland,
@gsuberland@chaos.social avatar

@jeffpc yup. it's kinda funny how close to the limit of single-ended signalling PCI was on regular FR4 boards. the insertion loss is pretty massive so you dump a ton of power trying to drive the bus over the distance of an ATX board. reflected wave was just enough to make it workable.

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