W25Q128FVSIF-TR Datasheet, PDF (19/100 Pages) Winbond – 3V 128M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q128FV
can be protected from Program and Erase instructions (see Status Register Memory Protection table).
The factory default setting for the Block Protection Bits is 0, none of the array protected.
7.1.4 Top/Bottom Block Protect (TB) – Volatile/Non-Volatile Writable
The non-volatile Top/Bottom bit (TB) controls if the Block Protect Bits (BP2, BP1, BP0) protect from the
Top (TB=0) or the Bottom (TB=1) of the array as shown in the Status Register Memory Protection table.
The factory default setting is TB=0. The TB bit can be set with the Write Status Register Instruction
depending on the state of the SRP0, SRP1 and WEL bits.
7.1.5 Sector/Block Protect Bit (SEC) – Volatile/Non-Volatile Writable
The non-volatile Sector/Block Protect bit (SEC) controls if the Block Protect Bits (BP2, BP1, BP0)
protect either 4KB Sectors (SEC=1) or 64KB Blocks (SEC=0) in the Top (TB=0) or the Bottom (TB=1)
of the array as shown in the Status Register Memory Protection table. The default setting is SEC=0.
7.1.6 Complement Protect (CMP) – Volatile/Non-Volatile Writable
The Complement Protect bit (CMP) is a non-volatile read/write bit in the status register (S14). It is used
in conjunction with SEC, TB, BP2, BP1 and BP0 bits to provide more flexibility for the array protection.
Once CMP is set to 1, previous array protection set by SEC, TB, BP2, BP1 and BP0 will be reversed.
For instance, when CMP=0, a top 64KB block can be protected while the rest of the array is not; when
CMP=1, the top 64KB block will become unprotected while the rest of the array become read-only.
Please refer to the Status Register Memory Protection table for details. The default setting is CMP=0.
7.1.7 Status Register Protect (SRP1, SRP0) – Volatile/Non-Volatile Writable
The Status Register Protect bits (SRP1 and SRP0) are non-volatile read/write bits in the status register
(S8 and S7). The SRP bits control the method of write protection: software protection, hardware
protection, power supply lock-down or one time programmable (OTP) protection.
SRP1 SRP0 /WP
Status
Register
Description
0
0
X
Software
Protection
/WP pin has no control. The Status register can be
written to after a Write Enable instruction, WEL=1.
[Factory Default]
0
1
0
Hardware
Protected
When /WP pin is low the Status Register locked and
cannot be written to.
Hardware
When /WP pin is high the Status register is unlocked
0
1
1
Unprotecte and can be written to after a Write Enable instruction,
d
WEL=1.
1
0
X
Power
Supply
Lock-Down
Status Register is protected and cannot be written to
again until the next power-down, power-up cycle.⁽¹⁾
1
1
X
One Time
Program⁽²⁾
Status Register is permanently protected and cannot be
written to.
Notes:
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 upon special order. Please contact Winbond for details.
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Publication Release Date: October 09, 2013
Revision I