GD25VQ127CSFS datasheet(30/62 Pages) GIGADEVICE

30 / 62 page

Uniform Sector

Dual and Quad Serial Flash

GD25VQ127C

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 (DP) command is entered by driving CS# low, followed by the command code on SI. CS# must

be driven low for the entire duration of the sequence.

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 below. 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 below. The Device ID value for the GD25Q256C

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, 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 in process (when

WIP equal 1) the command is ignored and will not have any effects on the current cycle.

Figure23. Release Power-Down Sequence Diagram

Command

B9H

CS#

SCLK

tDP

Stand-by mode Deep Power-down mode

Command

ABH

CS#

SCLK

RES1

Stand-by mode

Deep Power-down mode

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