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W25Q128FVEIG Datasheet(HTML) 76 Page - Winbond

Part No. W25Q128FVEIG
Description  SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI
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Maker  WINBOND [Winbond]
Homepage  http://www.winbond.com
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W25Q128FVEIG Datasheet(HTML) 76 Page - Winbond

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W25Q128FV
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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).
Figure 53a. Individual Block Unlock Instruction (SPI Mode)
Figure 53b. Individual Block Unlock Instruction (QPI Mode)


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