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W25Q128FVEIG Datasheet(PDF) 65 Page - Winbond

Part # W25Q128FVEIG
Description  SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W25Q128FVEIG Datasheet(HTML) 65 Page - Winbond

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W25Q128FV
Publication Release Date: October 01, 2012
- 64 -
Revision D
8.2.28 Read Unique ID Number (4Bh)
The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number that is unique to
each W25Q128FV device. The ID number can be used in conjunction with user software methods to help
prevent copying or cloning of a system. The Read Unique ID instruction is initiated by driving the /CS pin
low and shifting the instruction code “4Bh” followed by a four bytes of dummy clocks. After which, the 64-
bit ID is shifted out on the falling edge of CLK as shown in Figure 42.
/CS
CLK
DI
(IO
0)
DO
(IO
1)
Mode 0
Mode 3
0
1
2
3
4
5
6
7
Instruction (4Bh)
High Impedance
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/CS
CLK
DI
(IO
0)
DO
(IO
1)
24
25
26
27
28
29
30
31
32
33
34
36
37
38
35
23
Mode 0
Mode 3
*
Dummy Byte 1
Dummy Byte 2
39
40
41
42
Dummy Byte 3
Dummy Byte 4
63
62
61
2
1
0
64-bit Unique Serial Number
High Impedance
= MSB
*
Figure 42. Read Unique ID Number Instruction (SPI Mode only)


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