Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/MIMXRT1021/SAI1/RFR[3]#0x0
RCP=RCP_0
SAI Receive FIFO Register
Read FIFO Pointer
Receive Channel Pointer
0 (RCP_0): No effect.
1 (RCP_1): FIFO combine is enabled for FIFO reads and this FIFO will be read on the next FIFO read.
Write FIFO Pointer
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https://github.com/cmsis-svd/cmsis-svd-data