ACE25AC100G

SPI NOR FLASH

VER 1.1

5

Status Register

S7

S6

S5

S4

S3

S2

S1

S0

SRWD

Reserved

Reserved

BP2

BP1

BP0

WEL

WIP

The status and control bits of the Status Register are as follows:

WIP bit.

The Write In Progress (WIP) bit indicates whether the memory is busy in program/erase/write status

register progress. When WIP bit sets to 1, the device is busy in program/erase/write status register

progress. When WIP bit sets 0, the device is not in program, erase or write status register.

WEL bit.

The Write Enable Latch (WEL) bit indicates the status of the internal Write Enable Latch. When set to 1,

the internal Write Enable Latch is set. When set to 0, the internal Write Enable Latch is reset and no Write

Status Register, Program or Erase command is accepted.

BP2, BP1, BP0 bits.

The Block Protect (BP2, BP1, BP0) bits are non-volatile. They define the size of the area to be software

protected against Program and Erase commands. These bits are written with the Write Status Register

(WRSR) command. When the Block Protect (BP2, BP1, BP0) bits are set to 1, the relevant memory area

(as defined in Table1) becomes protected against Page Program (PP), Sector Erase (SE) and Block

Erase (BE) commands. Chip Erase command will be ignored if one or more of the Block Protect (BP2,

BP1, BP0) bits are 1.

SRWD bit.

The Status Register Write Disable (SRWD) bit is a non-volatile One Time Program (OTP) bit in the status

register that provide another software protection. Once it is set to 1, the Write Status Register (WRSR)

instruction is no longer accepted and the SRWD bit and Block Protect bits (BP2, BP1, BP0) are read only.

SRWD

Status register

Memory

0

Status register can be written in (WEL bit is

set to "1") and the SRWD, BP2-BP0 bits can

be changed

The protected area cannot be program or erase

1

The SRWD, BP2-BP0 of status register bits

cannot be changed

The protected area cannot be program or erase