GD25B256DFIS datasheet(48/82 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B256D

7.22.

Read Unique ID (4BH)

The Read Unique ID command accesses a factory-set read-only 128bit number that is unique to each device. The

Unique ID can be used in conjunction with user software methods to help prevent copying or cloning of a system.

The Read Unique ID command sequence in 3 Byte mode (ADS=0): CS# goes low  sending Read Unique ID

command Dummy Byte1 Dummy Byte2 Dummy Byte3 Dummy Byte4128bit Unique ID Out CS# goes high.

The Read Unique ID command sequence in 4 Byte mode (ADS=0): CS# goes low  sending Read Unique ID

command Dummy Byte1 Dummy Byte2 Dummy Byte3 Dummy Byte4 Dummy Byte5128bit Unique ID Out

CS# goes high.

Figure 52 Read Unique ID Sequence Diagram (ADS=0)

Command

0 1 2 3 4 5 6 7

4BH

CS#

SCLK

High-Z

8 9 10

3 2 1 0

7 6 5

4-Byte Dummy

MSB

6 5 4 3 2 1 0

Data Out1

6 5

Data Out2

CS#

SCLK

MSB

42 43 44 45

46 47

36 37 38 39

Figure 53 Read Unique ID Sequence Diagram (ADS=1)

Command

0 1 2 3 4 5 6 7

4BH

CS#

SCLK

High-Z

8 9 10

44 45 46 47

3 2 1 0

7 6 5

5-Byte Dummy

MSB

6 5 4 3 2 1 0

Data Out1

50 51 52 53

54 55

6 5

Data Out2

CS#

SCLK

MSB

GD25B256DFIS Datasheet(PDF) 48 Page - GigaDevice Semiconductor (Beijing) Inc.

GD25B256DFIS Datasheet(HTML) 48 Page - GigaDevice Semiconductor (Beijing) Inc.

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