After the Host has
read a message or a sequence of messages from Rx FIFO 1 it has to write the buffer
index of the last element read from Rx FIFO 1 to F1AI. This will set the Rx FIFO 1
Get Index RXF1S.F1GI bits (RXF1S <13:8>) to F1AI + 1 and update the FIFO 1 Fill
Level RXF1S.F1FL bits (RXF1S <6:0>).
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