25Q64FWSIG datasheet(74/94 Pages) WINBOND

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W25Q64FW

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8.2.39

Individual Block/Sector Unlock (39h)

The Individual Block/Sector Lock provides an alternative way to protect the memory array from adverse

Erase/Program. In order to use the Individual Block/Sector Locks, the WPS bit in Status Register-3 must

be set to 1. If WPS=0, the write protection will be determined by the combination of CMP, SEC, TB,

BP[2:0] bits in the Status Registers. The Individual Block/Sector Lock bits are volatile bits. The default

values after device power up or after a Reset are 1, so the entire memory array is being protected.

To unlock a specific block or sector as illustrated in Figure 4d, an Individual Block/Sector Unlock

command must be issued by driving /CS low, shifting the instruction code “39h” into the Data Input (DI) pin

on the rising edge of CLK, followed by a 24-bit address and then driving /CS high. A Write Enable

instruction must be executed before the device will accept the Individual Block/Sector Unlock Instruction

(Status Register bit WEL= 1).

/CS

CLK

(IO0)

(IO1)

Mode 0

Mode 3

Instruction (39h)

High Impedance

24-Bit Address

Mode 0

Mode 3

= MSB

Figure 52a. Individual Block Unlock Instruction (SPI Mode)

/CS

CLK

Mode 0

Mode 3

IO0

IO1

IO2

IO3

39h

Instruction

A23-16

A15-8

A7-0

Mode 0

Mode 3

Figure 52b. Individual Block Unlock Instruction (QPI Mode)

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