35.5.4.3 Deep Power-Down Mode

The Deep Power-down mode is a feature of low-power DDR-SDRAM. When this mode is activated, all internal voltage generators inside the device are stopped and all data is lost.

Deep Power-down mode is activated by configuring the Low-power Command bit (LPCB) to 3 in the MPDDRC Low-Power Register (MPDDRC_LPR). When this mode is enabled, the MPDDRC leaves Normal mode (MPDDRC_MR.MODE = 0) and the controller is frozen. The clock can be stopped during Deep Power-down mode by setting the CLK_FR field to 1.

Before enabling this mode, the user must make sure there is no access in progress. To exit Deep Power-down mode, the Low-power Command bit (LPCB) and Clock Frozen bit (CLK_FR) must be 0 and the initialization sequence must be generated by software. See Low-power DDR1-SDRAM Initialization or Low-power DDR2-SDRAM Initialization or Low-power DDR3-SDRAM Initialization.