IS25LP064A-RGLA1 datasheet(63/99 Pages) ISSI

63 / 99 page

IS25LP064A/032A

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

Rev. A

11/06/2015

8.28 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 a dummy byte. 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 except for the instruction code. RDUID

QPI sequence is also same as FAST READ QPI except for the instruction code. Refer to the FAST READ QPI

operation.

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

Figure 8.48 RDUID Sequence

Instruction = 4Bh

Dummy Byte

CE #

SCK

...

Mode 3

Mode 0

3 Byte Address

Data Out

...

Table 8.6 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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