ACE25C800G Datasheet, PDF (23/37 Pages) ACE Technology Co., LTD. – Uniform SECTOR Dual and Quad Serial Flash

ACE25C800G
Uniform SECTOR Dual and Quad Serial Flash
The Deep Power-Down command sequence: CS# goes low sending Deep Power-Down command
CS# goes high. The command sequence is shown in Figure19. 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.
Figure19. Deep Power-Down Sequence Diagram
Release from Deep Power-Down And Read Device ID (RDI) (ABH)
The Release from Power-Down or 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 Figure20. Release from
Power-Down will take the time duration of tRES1 (See AC Characteristics) before the device will
resume normal operation and other command 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 Figure20. The Device ID value for the ACE25C800G 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 Figure20, 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.
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