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Photo of the setup. On the left side a PCIe switch card with one uplink port going through USB3 cable. It's upside down and 2 resistors are hacked on the PET PCIe lanes to foot RX detection. On the top right, the RPI5 with PCIe hat and my board plugged in it with a SFP module and optical cable coming out. On the bottom right another one of my board with SFP module and optical cable coming in. That one it plugged into a PCIe slot going through USB3 cable, going to the PCIe switch board.

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Photo of the setup. On the left side a PCIe switch card with one uplink port going through USB3 cable. It's upside down and 2 resistors are hacked on the PET PCIe lanes to foot RX detection. On the top right, the RPI5 with PCIe hat and my board plugged in it with a SFP module and optical cable coming out. On the bottom right another one of my board with SFP module and optical cable coming in. That one it plugged into a PCIe slot going through USB3 cable, going to the PCIe switch board.
https://assets.chaos.social/media_attachments/files/113/861/902/480/445/870/original/9dbfd7a8e40b6c29.jpeg

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tnt (tnt@chaos.social)'s status on Tuesday, 21-Jan-2025 16:49:12 JST tnt
in reply to

It works 🎉
Ok, the setup is very janky because of a couple of issue :
* I of course screwed up TX/RX at one place, so the usb3 connector part didn't work, had to go through the slot to go to the device, ugly but it worked.
And I swear I had tripled checked ... still screwed up :/

* The SN75lLVPE802 is meant for SATA not PCIe and doesn't have DC termination. The datasheet say you can use it for PCIe and use 330R to GND to make PCIe RX detect work.
That doesn't work :/ Had to use lower R.

In conversation about 4 months ago from gnusocial.jp permalink