looking for datasheet PS8321 or PS8331 from Parade Technology

[free_electron]

These are very specialistic Displayport multiplexers with on board timing equalizers and output drivers.

I'm trying to build a displayport KVM. nothing in the market satisfies my needs. However, most of the KVM's out there use this chip and i can get the chips, no problem. But i need the datasheet ( they talk I2C ) ...
i want to make a multiplexer that can switch between 3 computers. Each computer has 3 displayports and i have 3 monitors. so 9 in , 3 out . the switch includes a USB3.0 hub with 6 user accessible downstream ports and a seventh special function port.
The idea is to switch keyboard , mouse, spacemouse, smart keypad , digitizer over together with the displays. I have everything worked out. , but i'm in doubt between using TI displayport chips together with Pericom redriver chips ( i'm driving long cables so i want to clean up the eye patterns on the displayport ) or these parade tech chips.
I've bought a number of 2 channel dp switches and studied many schematics of hi end laptops, graphics cards and docking stations. They all use Parade chips. nobody mucks with TI or Pericom or the other 'known' brands. Apparently the Parade chips have more features and some secret sauce that nobody else has for this purpose.

[sd]

TI multiplexers and Pericoms redrivers should work fine.

I have used TS3DV642 and PI3DPX1203 for DP 1.2, 4K@60Hz.

CPU DP and MXM GPU DP -> ~20cm PCB trace length - > TS3DV642 -> ~10cm PCB trace length -> FX15SC 51 pin connector  -> ~40cm microcoax custom cable (extremely high loss compared to the cheapest 2m DP cable) -> FX15SC on a rigid flex PCB -> PI3DPX1203 -> DP connector. Worked fine after tweaking the PI3DPX1203 a bit.

[free_electron]

Problem is that the pericom chip does not take part in the retraining ( it does not listen to the aux channel ) you need to futz with it using settings pins or i2c.
The Parade chips and certain TI chips listen to the commands on the aux channel and take part in retraining.

I had that exact pericom chip in mind.

[sd]

It's transparent to link training which sometimes can be a good thing. In my case I just used the redriver to compensate for GPU -> DP source connector losses.