ACE25C400

4MB Serial Flash Memory

VER 1.2

21

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 20, except that after CS# is

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.

Figure 19 Release power-down instruction

Figure 20 Release power-down / device ID instruction

Read Manufacturer / Device ID (90h)

The Read Manufacturer/Device ID instruction is an alternative to the Release from Power -down /

Device ID instruction that provides both the JEDEC assigned manufacturer ID and the specific device

ID.

The Read Manufacturer/Device ID instruction is very similar to the Release from Power -down /

Device ID instruction. The instruction is initiated by driving the CS# pin low and shifting the instruction

code “90h” followed by a 24-bit address A23-A0 of 000000h. After which, the Manufacturer ID for ACE

Technology CO., LTD. (A1h) and the Device ID are shifted out on the falling edge of CLK with most

significant bit (MSB) first as shown in Figure 21. The Device ID value for the ACE25C400 is listed in

Table 3 Manufacturer and Device Identification table. If the 24-bit address is initially set to 000001h

the Device ID will be read first and then followed by the Manufacturer ID.