K60P100M100SF2RM Datasheet, PDF (1441/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 49 SPI (DSPI)
The memory address of the last-in entry in the RX FIFO is computed by the following
equation:
RX FIFO Base - Base address of RX FIFO
RXCTR - RX FIFO counter
POPNXTPTR - Pop Next Pointer
RX FIFO Depth - Receive FIFO depth, implementation specific
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1441