W25Q32FVTBIG-TR Datasheet, PDF (76/99 Pages) Winbond – 3V 32M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q32FV
8.2.38 Individual Block/Sector Lock (36h)
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 lock a specific block or sector as illustrated in Figure 4d, an Individual Block/Sector Lock command
must be issued by driving /CS low, shifting the instruction code “36h” 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 Lock Instruction (Status
Register bit WEL= 1).
/CS
CLK
DI
(IO₀)
DO
(IO₁)
Mode 3
0
Mode 0
* ^{= MSB}
123456789
29 30 31
Instruction (36h)
24-Bit Address
23 22
*
High Impedance
210
Mode 3
Mode 0
Figure 52a. Individual Block/Sector Lock Instruction (SPI Mode)
/CS
CLK
IO₀
Mode 3
Mode 0
01234567
Instruction
36h
A23-16
20 16
A15-8
12 8
A7-0
40
Mode 3
Mode 0
IO₁
21 17 13 9 5 1
IO₂
22 18 14 10 6 2
IO₃
23 19 15 11 7 3
Figure 52b. Individual Block/Sector Lock Instruction (QPI Mode)
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