ACE25C200G datasheet(27/48 Pages) ACE

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ACE25C200G

2M BIT SPI NOR FLASH

VER 1.1

ID and Security Instructions

Read Manufacture ID/ Device ID (90H)

See Figure 17, 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 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. If the 24-bit address is initially set to 000001H, the Device

ID will be read first.

Figure 17 Read Manufacture ID/ Device ID Sequence Diagram

Figure 17

JEDEC ID (9FH)

The JEDEC ID instruction allows the 8-bit manufacturer identification to be read, followed by two

bytes of device identification. The device identification indicates the memory type in the first byte, and

the memory capacity of the device in the second byte. JEDEC ID instruction while an Erase or

Program cycle is in progress, is not decoded, and has no effect on the cycle that is in progress. The

JEDEC ID instruction should not be issued while the device is in Deep Power-Down Mode.

See Figure 18, he device is first selected by driving /CS to low. Then, the 8-bit instruction code for

the instruction is shifted in. This is followed by the 24-bit device identification, stored in the memory,

being shifted out on Serial Data Output, each bit being shifted out during the falling edge of Serial

Clock. The JEDEC ID instruction is terminated by driving /CS to high at any time during data output.

When /CS is driven high, the device is put in the Standby Mode. Once in the Standby Mode, the

device waits to be selected, so that it can receive, decode and execute instructions.

Figure 18 JEDEC ID Sequence Diagram

Figure 18

ACE25C200G Datasheet(PDF) 27 Page - ACE Technology Co., LTD.