3 ms·
While the ref clock is only 100MHz the data rate of PCI Express is much higher, it's a serial bus pushing multiple gigabits a second https://electronics.stacke
by LIV2 7y ago
While the ref clock is only 100MHz the data rate of PCI Express is much higher, it's a serial bus pushing multiple gigabits a second
https://electronics.stackexchange.com/a/259002 https://electronics.stackexchange.com/a/259002
- baybal2 7y agoYes, the theoretical maximum (nyquist freq) of PCIe 4 is 8ghz
- Kirby64 7y agoThe Pi4 isn't PCIe Gen 4, though. It's only PCIe Gen 2. Max speed of PCIe Gen 2 is 5GT/s, which equates to the same speed as standard USB3.0/USB3.1 Gen1/whatever its called nowadays.
- baybal2 7y agoNyqist frequency of 2Ghz for PCIe 2 (slightly less in practice due to line code) is still nothing to sneeze at.
- Kirby64 7y ago2.5 GHz, actually. Obviously there's limitations and you have to be careful, but it's not too crazy to think you could use a piece of USB3 cabling to do this. Requires some pretty precise soldering skills though.