W25X10BLSNIG WINBOND [Winbond], W25X10BLSNIG Datasheet - Page 37

• Manufacturer Part Number: W25X10BLSNIG
• Description: 1M-BIT, 2M-BIT AND 4M-BIT 2.5V SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI
• Manufacturer: WINBOND [Winbond]

9.2.23
The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number that is unique
to each W25X10BL/20BL/40BL 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 24.
DO
DO
DO
DO
*=MSB
*=MSB
Read Unique ID Number (4Bh)
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24 25
26
26
27 28
27 28
Figure 24. Read Unique ID Number Instruction Sequence
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W25X10BL/20BL/40BL
Publication Release Date: October 14, 2009
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42 43 44 101 102 103
Preliminary -- Revision A
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