ACE25Q400G datasheet(29/46 Pages) ACE

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ACE25Q400G

4M BIT SPI NOR FLASH Memory Series

VER 1.2

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

The Release from Power-Down or 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.

See Figure 20 , 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 Release from

Power-Down will take the time duration of tRES1 (See AC Characteristics) before the device will

resume normal operation and other instruction 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 byte.

The Device ID bits are then shifted out on the falling edge of SCLK with most significant bit (MSB) first

as shown in See Figure 21 The Device ID value for the ACE25Q400G is listed in 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 See Figure 21, 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 instruction 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 equal 1) the instruction is ignored and will not have any effects on the current cycle.

Figure 20 Release Power-Down Sequence Diagram

Figure 20

Figure 21 Release Power-Down/Read Device ID Sequence Diagram

Figure 21

ACE25Q400G Datasheet(PDF) 29 Page - ACE Technology Co., LTD.