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GD25B127D Datasheet(Scheda tecnica) 31 Page - GigaDevice Semiconductor (Beijing) Inc.

Numero della parte GD25B127D
Dettagli  3.3V Uniform Sector Dual and Quad Serial Flash
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Produttore  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Homepage  http://www.gigadevice.com/
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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B127D
31
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 GD25B127D
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
Figure24. Release Power-Down/Read Device ID Sequence Diagram
Command
0
1
2
3
4
5
6
7
ABH
CS#
SCLK
SI
8
9
29 30 31
MSB
2
1
0
3 Dummy Bytes
23 22
32 33 34 35 36 37 38
7
6
5
4
3
2
1
0
SO
MSB
t RES2
Stand-by Mode
Deep Power-down Mode
High-Z
Device ID
Command
0
1
2
3
4
5
6
7
ABH
CS#
SCLK
SI
RES1
Stand-by mode
Deep Power-down mode
t




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