ACE25AC100NLX

SPI NOR FLASH

VER 1.1

7

ID Definitions

Operation Code

M7-M0

ID15-ID8

ID7-ID0

9FH

0E

60

13

90H

0E

12

Write Enable (WREN) (06H)

The Write Enable (WREN) command is for setting the Write Enable Latch (WEL) bit. The Write Enable

Latch (WEL) bit must be set prior to every Page Program (PP), Sector Erase (SE), Block Erase (BE), Chip

Erase (CE) and Write Status Register (WRSR) command. The Write Enable (WREN) command

sequence: CS# goes low→Send Write Enable command→CS# goes high.

Write Disable (WRDI) (04H)

The Write Disable command is for resetting the Write Enable Latch (WEL) bit. The Write Disable

command sequence: CS# goes low →Send Write Disable command →CS# goes high. The WEL bit is

reset by following condition: Power-up and upon completion of the Write Status Register, Page Program,

Sector Erase, Block Erase and Chip Erase commands.

Figure1. Write Enable Sequence Diagram

Figure2. Write Disable Sequence Diagram