GD25LQ80C datasheet(29/68 Pages) GIGADEVICE

29 / 68 page

1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LQ80C

7.20 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.

The command sequence is shown in Figure22. 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.

Figure22. Deep Power-Down Sequence Diagram

7.21 Release from Deep Power-Down and Read Device ID (RDI) (ABH)

The Release from Power-Down and Read Device ID command is a multi-purpose command. It can be used to release the

device from the Power-Down state or obtain the devices electronic identification (ID) number.

To release the device from the Power-Down state, the command is issued by driving the CS# pin low, shifting the

instruction code

“ABH” and driving CS# high as shown in Figure23. Release from Power-Down will take the time duration

of tRES1 (See AC Characteristics) before the device will resume normal operation and other c omma nd are accepted. The

CS# pin must remain high during the tRES1 time duration.

When used only to obtain the Device ID while not in the Power-Down state, the command is initiated by driving the CS#

pin low and shifting the instruction code

“ABH” followed by 3-dummy Byte. The Device ID bits are then shifted out on the

falling edge of SCLK with most significant bit (MSB) first as shown in Figure24. The Device ID value is listed in

Manufacturer and Device Identification table. The Device ID can be read continuously. The command is completed by

driving CS# high.

When used to release the device from the Power-Down state and obtain the Device ID, the command is the same as

previously described, and shown in Figure24, except that after CS# is driven high it must remain high for a time duration

of tRES2 (See AC Characteristics). After this time duration the device will resume normal operation and other command will

be accepted. If the Release from Power-Down / Device ID command is issued while an Erase, Program or Write cycle is

Command

B9H

CS#

SCLK

tDP

Stand-by mode Deep Power-down mode

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