GD25Q64CFJS datasheet(33/74 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q64C

7.21. Deep Power-Down (DP) (B9H)

Executing the Deep Power-Down (DP) command is the only way to put the device in the lowest consumption mode (the

Deep Power-Down Mode). It can also be used as an extra software protection mechanism, while the device is not in active

use, since in this mode, the device ignores all Write, Program and Erase commands.

Driving CS# high deselects the device, and puts the device in the Standby Mode (if there is no internal cycle currently in

progress). But this mode is not the Deep Power-Down Mode. The Deep Power-Down Mode can only be entered by

executing the Deep Power-Down (DP) command. Once the device has entered the Deep Power-Down Mode, all commands

are ignored except the Release from Deep Power-Down and Read Device ID (RDI) command or software reset command.

The Release from Deep Power-Down and Read Device ID (RDI) command releases the device from Deep power-Down

mode , also allows the Device ID of the device to be output on SO.

The Deep Power-Down Mode automatically stops at Power-Down, and the device is in the Standby Mode after Power-Up.

The Deep Power-Down command sequence: CS# goes low  sending Deep Power-Down command  CS# goes high.

The command sequence is shown below. CS# must be driven high after the eighth bit of the command code has been

latched in; otherwise the Deep Power-Down (DP) command is not executed. As soon as CS# is driven high, it requires a

delay of tDP before the supply current is reduced to ICC2 and the Deep Power-Down Mode is entered. Any Deep Power-

Down (DP) command, while an Erase, Program or Write cycle is in progress, is rejected without having any effects on the

cycle that is in progress.

Figure 25. Deep Power-Down Sequence Diagram

Command

B9H

CS#

SCLK

tDP

Stand-by mode Deep Power-down mode

GD25Q64CFJS Datasheet(PDF) 33 Page - GigaDevice Semiconductor (Beijing) Inc.