Usb Host , the Fpga needs an Jtag for programming and config + an uart for communication so i wanted to pick the mostly used FT2232H wich features 2 buses (for my case 1 jtag and 1 uart) . But then i thought while researching reference schematics , kintex7 and vivado compability and reading the datasheet , if i shouldnt just use an FT4232HL , but why that ? the rockchip also needs an uart for debug and i thought about adding a jtag but it turned out its internally , now the FT4232HL has 4 buses ’ 2 of them can do jtag and 2 uart (or other protocols btw) so i went with that and started designing it , took longer than expected as the eeprom selection and crystal isnt really troughout in the datasheet … so now i have an jtag and uart for the fpga , one for the rockchip debug and 1 additional port i will find a use for eventually … but the rockchip still needs an usb direct connection so it will get 2 usb c ports , a multiplexer isnt good here as it would prevent from using any fpga (or uart debug on rockchip) while doing otg (eg. flashing or other stuff ) .. Btw the screenshot is only a fraction of the schematic of it as stardance shows the boring part of the full screenshot so i cropped it