ACE25QC200GLFMLTH datasheet(11/64 Pages) ACE

11 / 64 page

ACE25QC200GL

2M BIT SPI NOR FLASH

VER 1.1

(B)

WEL bit

The Write Enable Latch bit indicates the status of the internal Write Enable Latch. When WEL bit is set

to 1 the internal Write Enable Latch is set, when WEL bit is cleared to 0 the internal Write Enable Latch

is reset and no Write Status Register, Program or Erase instruction is accepted.

(C)

BP4, BP3, BP2, BP1, BP0 bits

The Block Protect (BP4, BP3, BP2, BP1, BP0) bits are non-volatile. They define the size of the area to

be software protected against Program and Erase instructions. These bits are written with the Write

Status Register instruction. When the Block Protect (BP4, BP3, BP2, BP1, BP0) bits are set to 1, the

relevant memory (as defined in Table 4 and Table 5) are became protected against Page Program,

Page Erase, Sector Erase and Block Erase instructions. The Block Protect (BP4, BP3, BP2, BP1, BP0)

bits can be written provided that the Hardware Protected mode has not been set. The Chip Erase

instruction is executed. If the Block Protect (BP2, BP1, and BP0) bits are 0 and CMP=0 or the Block

Protect (BP2, BP1 and BP0) bits are 1and CMP=1.

(D)

RP1, SRP0 bits

The Status Register Protect (SRP1 and SRP0) bits are non-volatile Read/Write bits in the status

power supply lock-down or one time programmable protection.

Table4. ACE25QC200GL Status Register protect table

SRP1

SRP0

/WP

Status Register

Description

Software Protected

The Status Register can be written to after a Write

Enable instruction, WEL=1.(Factory Default)

Hardware Protected

/WP=0, the Status Register locked and cannot be

written.

Hardware Unprotected

/WP=1, the Status Register is unlocked and can be

written to after a Write Enable instruction, WEL=1.

Power Supply

Lock-Down

(1)

Status Register is protected and cannot be written to

again until the next Power-Down, Power-Up cycle.

One Time Program

(2)

Status Register is permanently protected and cannot

be written to.

Notes:

When SRP1, SRP0= (1, 0), a Power-Down, Power-Up cycle will change SRP1, SRP0 to (0, 0) state.

The One time Program feature is available upon special order.

ACE25QC200GLFMLTH Datasheet(PDF) 11 Page - ACE Technology Co., LTD.

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