S25FL064K Meet Spansion Inc., S25FL064K Datasheet - Page 51

• Manufacturer Part Number: S25FL064K
• Description: 64-mbit Cmos 3.0 Volt Flash Memory With 80-mhz Spi Serial Peripheral Interface Multi I/o Bus
• Manufacturer: Meet Spansion Inc.

7.30
September 16, 2010 S25FL064K_00_02
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 S25FL064K 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
CLK
CLK
CS#
CS#
SO
SO
SI
SI
= MSB
Mode 3
Mode 0
D a t a
24 25 26 27 28
0
1
S h e e t
Dummy 3
Figure 7.34 Read Unique ID Number Instruction Sequence
Instruction (4B)
2
3
29 30 31
4
( P r e l i m i n a r y )
5
S25FL064K
6
32 33
7
High Impedance
8
34
Figure
Dummy 4
9
Dummy 1
35 36 37 38 39
10 11
7.34.
12 13
14 15 16
* *
40
63
64-bit Unique Serial Number
41 42
62 61 60 59
17 18 19
43 44 101 102 103
Dummy 2
2
20 21 22 23
1
0
Mode 3
Mode 0
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