W25Q16V
10.2.26 Read Unique ID Number (4Bh)
(1)
The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number that is unique
to each W25Q16 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 27.
DO
24 25
26
27
28
29 30
31 32 33
34
35 36
37 38
39
40
41
42
43 44 101 102 103
DO
*
*=MSB
63 62 61 60 59
2
1
0
Figure 27. Read Unique ID Number Instruction Sequence
Note:
1. For W25Q16, this feature is available upon special request. Please contact Winbond for details.
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Publication Release Date: October 7, 2009
Revision E
WINBOND [ WINBOND ]
