25X40BLSIG 查看數據表（PDF） - Winbond

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25X40BLSIG

1M-BIT, 2M-BIT AND 4M-BIT 2.5V SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI

Winbond 

W25X10BL/20BL/40BL

9.2.23 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 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

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 24. Read Unique ID Number Instruction Sequence

- 37 -

Publication Release Date: October 14, 2009

Preliminary -- Revision A

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