The LS1043a implements two DUART modules. DUART1 contains UART1 and UART2 and DUART2 contains UART3 and UART4.
The LS1043a UART3 SIN/SOUT can be assigned to UART1 CTS/RTS pins.
The LS1043a UART4 SIN/SOUT can be assigned to UART2 CTS/RTS pins.
The LS1043a UART1 and UART2 signals can be connected to the LS1043ARDB J4A and J4B.
If the LS1043ardb SW3[3] is OFF, UART1 is connected to J4A.
This setting provides used all UART1 signals or UART1 SIN/SOUT, UART3 SIN/SOUT on the J4a.
The LS1043ardb J4B always can be used as UART2 signals or UART2 SIN/SOUT, UART2 SIN/SOUT.
If the LS1043ardb SW3[3] is ON, UART1 is connected to CMSISDAP.
Have a great day,
Pavel Chubakov
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