Someone tried PCIe on the Raspberry Pi 4 already. Yes, the wiring job is horrible, and yes, of course it works, as I've said many times. Go hack on PCIe already, it's easier than you think. Now someone needs to stick a Radeon RX Vega on there, for kicks. http://mloduchowski.com/en/blog/raspberry-pi-4-b-pci-express/ …
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Oh, interesting, I thought it was doing some neat tricks on the signal edge at refclk, but in any case, I've found it is ridiculously resilient to being pushed around. I don't really use PCIe for anything though so never looked at how it attained its line rates.
The refclk is literally just a reference. If you don't use spread spectrum clocking, you can actually just locally generate 100MHz at each device and not have a refclk pair at all. The actual data is self-clocked 8b/10b (for PCIe 1.0 and 2.0).
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Yeah, only things I've done are at self-generated clocks. I just assumed that they were running the data at refclk and QAM or similar, given how spectacularly I fucked up the routing and had it still work.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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