The external flash memory can be put in Deep power-down mode (DPM) to minimize its current consumption when there is no need to access the memory.
DPM is enabled in register IFCONFIG0 and configured in register DPMDUR. The DPM status of the external memory can be read in the STATUS register. The DPMDUR register has to be configured according to the external flash specification to get the information in the STATUS register and the timing of the READY event correct.
Entering or exiting DPM is controlled using register IFCONFIG1.