I was reading through the datasheet regarding LPSPI registers and found where the FIFO size is set. The "parameter register (PARAM)" has two 8-bit fields that represent "maximum number of words in the receive FIFO, which is 2^RXFIFO" or "2^TXFIFO". As I read this, it implies an unreasonably large maximum FIFO size. The default value for both TX and RX is 4 which is a FIFO size of 16 words.
Looking further, the "FIFO control register (FCR)" includes 4-bit fields for FIFO watermark values. This allows for a maximum watermark value of 15.
So, simple question: Is the maximum LPSPI FIFO size for the RT10xx 16 words?