GD25WD80CSEG datasheet(21/47 Pages) GIGADEVICE

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Uniform Sector

Standard and Dual Serial Flash

GD25WD80C

7.14.

Release from Deep Power-Down / Read Device ID (ABH)

The Release from Power-Down and Read Device ID command is a multi-purpose command, which can be used to

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

When used 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 Figure14. Release from Power-Down will take the

time duration of tRES1 (See AC Characteristics) before the device will resume normal operation and other c omm and are

accepted. The CS# pin must keep 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 Figure15. The Device ID value for the

GD25WD80C 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 Figure15, 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 and Read 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.

Figure14. Release Power-Down Sequence Diagram

Figure15. Release Power-Down and Read Device ID Sequence Diagram

Command

ABH

CS#

SCLK

29 30 31

MSB

3 Dummy Bytes

23 22

32 33 34 35 36 37 38

MSB

t RES2

Stand-by Mode

Deep Power-down Mode

High-Z

Device ID

Command

ABH

CS#

SCLK

RES1

Stand-by mode

Deep Power-down mode

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