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AT25SF321B датащи(PDF) 32 Page - Dialog Semiconductor

номер детали AT25SF321B
подробное описание детали  32-Mbit SPI Serial Flash Memory with Dual-I/O and Quad-I/O Support
PDF  61 Pages
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AT25SF321B датащи(HTML) 32 Page - Dialog Semiconductor

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AT25SF321B
DS-AT25SF321B–179E–06-2020
10.
Security Register Commands
The device contains three extra Security Registers pages, that can be used for unique device serialization, system-
level Electronic Serial Number (ESN) storage, locked key storage, etc. The Security Registers are independent of
the main Flash memory.
Each page of the Security Register can be erased and programmed independently. Each page can also be
independently locked to prevent further changes.
10.1 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
AT25SF321B 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 four dummy byte clock cycles. After this, the 64-bit ID is shifted out on the
falling edge of SCLK, as shown in Figure 10-1.
Figure 10-1. Read Unique ID Timing (SPI Mode)
01234567
Mode 0
Mode 3
Instruction
CS
SCK
SI
SO
4BH
_
HIGH-IMPEDANCE
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Dummy Byte
1
Dummy Byte
2
Mode 0
Mode 3
25
26
27
28
29
23
CS
SCK
SI
24
30
SO
62
63
32
33
34
35
36
31
37
39
40
41
100 101
38
102
Dummy Byte 3
Dummy Byte 4
0
1
2
_
64- bit Unique
Serial Number
MSB
103
HIGH-IMPEDANCE



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