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TMDSCNCD28069MISO: 28069control card_curiosity about circuits

Part Number: TMDSCNCD28069MISO
Other Parts Discussed in Thread: C2000WARE, TMDSCNCD28069ISO

I have a schematic(circuit diagram) for f2806x iso-controlcardr0.4-sch used DRV8301-HC-EVM Rev D.

I don't understand some of the functions.

1. U15 is FT2232H. What is the function of this circuit?

2. What is the function of U19, U20, U21, U22?

3. U200 is TPS2051BDBVR. What is the function of this circuit?