RXFD_MODE and TXFD_MODE pins, what are they for?
STM32H745 DS indicates there are these signals:
CANFD1_TXFD_MODE
CANFD1_RXFD_MODE
CANFD2_TXFD_MODE
CANFD2_RXFD_MODE
No mention is made in the DS for their purpose, nor in AN5348 "FDCAN peripheral on STM32 devices". The signals are not mentioned at all in the RM.
So what are those signals for? How do you use them?