Would it be possible to just use a not feature complete usb c for display in?
Yea I had the same thought, a lot of portable displays do this. You would either need a USB-C on the GPU or a passive DP to USB-C adapter.
This VESA doc mentions that exact use case on pg 12.
Yes, in theory thats definitely possible.
There are 2 reasons why I havent really considered it:
- This could easily be confusing if every other type C port on the laptop has USB capabilities and some even have PD capabilities and then this one type C port can ONLY do DP in
- This probably requires a specialized port controller IC and while I have seen one that did support DP Alt mode I dont think it supports doing ONLY DP Alt mode and would either not work for this application or require special programming
Just finding a mini DP connector would be far easier and less likely to confuse people then any of that.
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Another quick update:
I have finally finished both impedance matching and length matching all the PCIe traces for the OcuLink connector!
In theory this only leaves 2 things to do. Connecting power to the OcuLink connector, which should be fairly easy and connecting the DP In port (I really need to spend some more time searching a connector here!).
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Hey @XPModder while I’m not sure if I can be much help, I’m curious if you could upload this to github. Or is this project one you’re planning to sell?
@XPModder I was wondering the same thing as @Cieric, it seems the git repo has a rather outdated version of this project, before any of the ICs were moved into place, or wired up. I was initially planning to do a more minimal experimental design from the expansion bay, but would love to contribute to this project if possible!
Nice! Im doing a similar project but instead of more expansion bays, im adding the ability to connect any pcie device to a pcie x 16 (only x8 lanes) to the rear. The expansion bay already has a cutout for a pcie slot so i figured i would design a board to do that. Here is my progress so far. Im already designing a buck converter around the RT7258GQW to convert the 15-20V from the interposer to a stable 12v and 3.3V for the 75W available through the PCIE slot. Im a freshman in college and still a semi beginner in PCB design so if you notice any large flaws please let me know.
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Not an expert but… is that a male PCI-E 16x? Don’t we need a female connector so we can plug devices in, or am I just being dumb? 
Sick idea BTW, I wish I could design PCBs… Maybe I’ll join a course or something one day…
its a edge connector (female) the pads are just to solder onto the connector itself
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The more you know… Thanks! I learned something new today! 
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