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W25Q128BV
7.2.34 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 W25Q128BV 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 32.
/CS
Mode 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
CLK
Mode 0
DI
(IO 0 )
DO
(IO 1 )
/CS
Instruction (4Bh)
Dummy Byte 1
High Impedance
Dummy Byte 2
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Mode 3
CLK
DI
(IO 0 )
Dummy Byte 3
Dummy Byte 4
Mode 0
DO
(IO 1 )
* = MSB
High Impedance
63
*
62 61 2 1
64-bit Unique Serial Number
0
Figure 32. Read Unique ID Number Instruction Sequence
- 54 -
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