GD25B16CSIG datasheet(11/53 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B16C

6. STATUS REGISTER

S15

S14

S13

S12

S11

S10

SUS

CMP

HPM

Reserved

SRP1

SRP0

BP4

BP3

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, means the device is busy in program/erase/write status register progress, when WIP bit sets 0,

means the device is not in program/erase/write status register progress.

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.

BP4, BP3, BP2, BP1, BP0 bits.

The Block Protect (BP4, BP3, BP2, BP1, and 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 (BP4, BP3, 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. The Chip

Erase (CE) command is executed, only if the Block Protect (BP2, BP1, and BP0) bits are 0 and CMP=0.

SRP1, SRP0 bits.

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

bits control the method of write protection: software protection, power supply lock-down or one time programmable

protection.

SRP1

SRP0

Status Register

Description

Software Protected

The Status Register can be written to after a Write Enable

command, WEL=1.(Default)

Power Supply Lock-Down(1)

(2)

Status Register is protected and can not be written to again

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

One Time Program(2)

Status Register is permanently protected and can not be

written to.

NOTE:

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

2. This feature is available on special order. Please contact GigaDevice for details.

QE bit.

The Quad Enable (QE) bit is a non-volatile read only bit which allows Quad operation. The default value of QE bit is

1, and it cannot be changed so that the Quad IO2 and IO3 pins are enabled all the time.

LB bit.

The LB bit is a non-volatile One Time Program (OTP) bit in Status Register (S10) that provide the write protect control

and status to the Security Registers. The default state of LB is 0, the security registers are unlocked. LB can be set to 1

individually using the Write Register instruction. LB is One Time Programmable, once it’s set to 1, the Security Registers

will become read-only permanently.

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