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When the FIFO Lite starts the x48 oscillator family is selected.
Moreover the FIFO Lite auto-performs oscillators selection when the I2S input signal is detected, and there is no way to manually select between the oscillators.
So the only way could be using a pair of splitters after the oscillators (one for each oscillators) to send the MCK to both FIFO Lite and TWTMC-STS-FSDO-S boards.
This way the FIFO Lite is fed by the MCK and the proper oscillator is selected, and also the BBB will receive the MCK by the TWTMC-STS-FSDO-S.