I was looking at common USB UART chips such as the FT232BM
which can (according to the datasheet) do upto 3 Mbps in USB 1.1 mode, or allegedly 12 Mbps in usb 2.0 mode.
What is the highest stable usb -> xmega baud rates that people have achieved? Can the USB chips really do 3 or 12 Mbps? Can the XMEGA service these high rates and do some other task? What sort of rate can I expect to get working?
Also, aside from USB UART, what rates have people achieved using direct UART between two XMEGA's?