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GD25Q128CXIGX Datasheet(PDF) 49 Page - ELM Electronics

No. de pieza GD25Q128CXIGX
Descripción Electrónicos  3.3V Uniform Sector Dual and Quad Serial Flash
PDF  69 Pages
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Fabricante Electrónico  ELM [ELM Electronics]
Página de inicio  http://www.elmelectronics.com
Logo ELM - ELM Electronics

GD25Q128CXIGX Datasheet(HTML) 49 Page - ELM Electronics

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69 -
http://www.elm-tech.com
GD25Q128CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash
7.31. Individual Block/Sector Lock (36H)/Unlock (39H)/Read (3DH)
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, BP (4:0) bits in the Status Register.
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.
The individual Block/Sector Lock command (36H) sequence: CS# goes low → SI: Sending individual Block/
Sector Lock command → SI: Sending 24bits individual Block/Sector Lock Address → CS# goes high. The
command sequence is shown in Figure34.
The individual Block/Sector Unlock command (39H) sequence: CS# goes low → SI: Sending individual
Block/Sector Unlock command → SI: Sending 24bits individual Block/Sector Lock Address → CS# goes high.
The command sequence is shown in Figure35.
The Read individual Block/Sector lock command (3DH) sequence: CS# goes low → SI: Sending Read
individual Block/Sector Lock command → SI: Sending 24bits individual Block/Sector Lock Address → SO:
The Block/Sector Lock Bit will out → CS# goes high. If the least significant bit(LSB) is1, the corresponding
block/sector is locked, if the LSB is 0, the corresponding block/sector is unlocked, Erase/Program operation can
be performed. The command sequence is shown in Figure36.
Figure 34. Individual Block/Sector Lock command Sequence Diagram
Command
0 1 2 3 4 5 6 7
36H
CS#
SCLK
SI
8 9
29 30 31
MSB
2 1 0
24 Bits Address
23 22
Figure 34a. Individual Block/Sector Lock command Sequence Diagram (QPI)
CS#
SCLK
IO0
IO1
IO2
IO3
0
1
2
3
4
5
Command
36H
20
12
16
8
A23-16 A12-8
6
7
0
21
13
17
9
1
23
15
19
11
3
22
14
18
10
2
4
5
6
7
A7-0


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