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Unfortunately, DisplayPort and HDMI specifications are kept private unless you're a paying member. I've successfully implemented DisplayPort 1.2 in an FPGA from specification documents I found, but I could never find the specification for anything better.

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Do you have anything online documenting how you did this? That’s actually really cool

I thought only HDMI is problematic, and DP is quite open?

My understanding is that display-port is quite open in that there is no per-device fee for implementing it, I suspect you still have to be a vesa "member" to get a legit copy of the spec.

Honestly at this point I consider VESA one of the good guys. At least compared to the alternative, spits, HDMI

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