GD25LB64CSIS datasheet(38/70 Pages) GIGADEVICE

38 / 70 page

1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LB64C

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 Figure22. 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 Figure23. The Device ID value for the

GD25LB64C 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 Figure23, 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.

Figure22. Release Power-Down Sequence Diagram

Command

ABH

CS#

SCLK

RES1

Stand-by mode

Deep Power-down mode

Figure22a. Release Power-Down Sequence Diagram (QPI)

CS#

SCLK

IO0

IO1

IO2

IO3

Command

ABH

tRES1

Deep Power-down mode

Stand-by mode

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