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AT25QL641

DS-25QL641–130E–10/2018

7.37

Enter Secured OTP (B1h)

The ‘Enter Secured OTP’ instruction is for entering the additional 4 Kbit secured OTP mode. This additional mode is

independent from the main array, which may be used to store unique serial number for system identifier. After entering

the Secured OTP mode, the standard read or program procedure can be used to read or write data. The Secured OTP

data cannot be updated again once it is locked down.

Please note that ‘Write Status Register-1’, ‘Write Status Register-2’ and ‘Write Security Register’ instructions are not

acceptable during the access of secure OTP region. Once security OTP is locked down, only commands related with

read are valid. The ‘Enter Secured OTP’ instruction sequence is shown in Figure 7-59.

Figure 7-59. Enter Secured OTP Instruction for SPI Mode (left) and QPI Mode (right)

Array Protection Method

10b: Use non-volatile

status register

84h

85h

01:00

00h

Power up Protection default

0: Power up unprotected

1: Power up protected

Protection Disable Opcodes

011b: Use status register

05:03

00 0

Protection Enable Opcodes

011b: Use status register

08:06

0 00

Protection Read Opcodes

011b: Use status register

11:09

000

Protection Register Erase

Opcode

00b: Not supported

01b: Opcodes

3Dh, 2Ah, 7Fh, FCh

13:12

Protection Register Program

Opcode

00b: Not supported

01b: Opcodes

3Dh, 2Ah, 7Fh, FCh

15:14

Reserved

FFh

86h

23:16

1111 1111

FFh

Reserved

FFh

87h

31:24

1111 1111

FFh

Reserved

FFh

88h - FFh

Reserved

Table 7-11.

SFDP Parameters Table 2 (Continued)

Description

Comment

Address

(h) Byte

Address

(Bit)

Data (b)

(Bit)

Data (h)

(Byte)

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