Hello,
I consider using RTS5420 for Jetson Nano Carrier Board.
Nano Dev Kit => RTS5411 (USB3.0)
Xavier NX Dev Kit => RTS5420 (USB3.1)
USB Design Guide and Pinmap are very simillar between Nano and Xavier NX.
So, I think RTS5420 is available on Jetson Nano.
Is there any problem before I try?