Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/SiM3_NRND/SIM3C167_B/I2S_0/FIFOSTATUS#0x0
FIFO Status
Transmit FIFO Status.
Receive FIFO Status.
https://github.com/cmsis-svd/cmsis-svd-data