ACE25C512 Datasheet, PDF (21/34 Pages) ACE Technology Co., LTD. – 512K-BIT Serial Flash Memory

ACE25C512
512K-BIT Serial Flash Memory
Figure 19 Deep power-down instruction
Release Power-down / Device ID (ABh)
The Release from Power-down / Device ID instruction is a multi-purpose instruction. 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 instruction is issued by driving the CS# pin low,
shifting the instruction code “ABh” and driving CS# high as shown in Figure 20. Release from
power-down will take the time duration of tRES1 (See “12.6 AC Electrical Characteristics”) before the
device will resume normal operation and other instructions 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 instruction is initiated
by driving the CS# pin low and shifting the instruction code “ABh” followed by 3-dummy bytes. The
Device ID bits are then shifted out on the falling edge of CLK with most significa nt bit (MSB) first as
shown in Figure 19. The Device ID value for the ACE25C512 is listed in Table 3 Manufacturer and
Device Identification table. The Device ID can be read continuously. The instruction is completed by
driving CS# high.
When used to release the device from the power-down state and obtain the Device ID, the
instruction is the same as previously described, and shown in Figure 21, except that after CS# is
driven high it must remain high for a time duration of t_RES2 (See “12.6 AC Electrical Characteristics”).
After this time duration the device will resume normal operation and other instructions will be
accepted. If the Release from Power-down / Device ID instruction is issued while an Erase, Program
or Write cycle is in process (when WIP equals 1) the instruction is ignored and will not have any
effects on the current cycle.
VER 1.2 21