GD9FS1G8F2AMG datasheet(31/55 Pages) GIGADEVICE

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GD9Fx1GxF2A

8.5.2 Read Unique ID (EDH)

The Read Unique ID function is used to retrieve the 16 byte unique ID (UID) for the device. The unique ID when combined

with the device manufacturer shall be unique.

The UID data may be stored within the Flash array. To allow the host to determine if the UID is without bit errors, the UID

is returned with its complement. If the XOR of the UID and its bit-wise complement is all ones, then the UID is valid. To

accommodate robust retrieval of the UID in the case of bit errors, sixteen copies of the UID and the corresponding

complement shall be stored by the target. For example, reading bytes 32-63 returns to the host another copy of the UID

and its complement.

To change the data output location, it is recommended to use the Random Data Out command set (05H-E0H).The Status

Read command (70H) can be used to check the completion. To continue the read operation, a following read command

(00h) to re-enable the data out is necessary.

Bytes

Value

0-15

UID

16-31

UID complement (bit-wise)

CLE

00H

U00

U10

U01

U11

…

WE#

ALE

RE#

EDH

IO0-7

R/B#

Figure26: Read Unique ID Timing

GD9FS1G8F2AMG Datasheet(PDF) 31 Page - GigaDevice Semiconductor (Beijing) Inc.