37.17.3.1 NFC Timing Engine
When the NFC Command register is written, the NFC issues a NAND Flash Command and optionally performs a data transfer between the NFC SRAM and the NAND Flash device. The NFC Timing Engine ensures valid NAND Flash timings, depending on the set of parameters decoded from the address bus. These timings are defined in the HSMC_TIMINGS register.
For information on the timing used depending on the command, see the figure below.
See the register descriptions NFCADDR_CMD and HSMC_TIMINGSx.