GD25B256DFIS datasheet(47/82 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B256D

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 always in the Standby Mode after

Power-Up.

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

high. 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 51 Deep Power-Down Sequence Diagram

Command

B9H

CS#

SCLK

tDP

Stand-by mode Deep Power-down mode

GD25B256DFIS Datasheet(PDF) 47 Page - GigaDevice Semiconductor (Beijing) Inc.