IS25LEG-RHLA2:P-TY datasheet(119/193 Pages) ISSI

119 / 193 page

IS25LE01GG

IS25WE01GG

Integrated Silicon Solution, Inc.- www.issi.com

119

Rev. A3

10/02/2025

8.35 READ UNIQUE ID NUMBER (RDUID, 4Bh)

The Read Unique ID Number (RDUID) instruction accesses a factory-set read-only 16-byte number that is unique

to the device. The ID number can be used in conjunction with user software methods to help prevent copying or

cloning of a system. The RDUID instruction is instated by driving the CE# pin low and shifting the instruction code

(4Bh) followed by 3 address bytes and dummy cycles (configurable, default is 8 clocks). After which, the 16-byte

ID is shifted out on the falling edge of SCK as shown below.

As a result, the sequence of RDUID instruction is same as FAST READ. RDUID sequence in QPI mode is also

same as FAST READ sequence in QPI mode except for the instruction code. Refer to the FAST READ operation

in QPI mode.

Note: 16 bytes of data will repeat as long as CE# is low and SCK is toggling.

Figure 8.76 RDUID Sequence In SPI Mode

Instruction = 4Bh

Dummy Cycles

CE#

SCK

...

Mode 3

Mode 0

3 Byte Address

Data Out

...

Note: Dummy cycles depends on Read Parameter setting. Detailed information in Table 6.11 Read Dummy Cycles.

Table 8.9 Unique ID Addressing

A[23:16]

A[15:9]

A[8:4]

A[3:0]

XXh

00h

0h Byte address

XXh

00h

1h Byte address

XXh

00h

2h Byte address

XXh

00h

XXh

00h

Fh Byte address

Note: XX means “don’t care”.

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