AT25SL321 datasheet(67/82 Pages) DIALOG

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AT25SL321

DS-25SL321–112H–2020-10

8.39 Read Security Register (2Bh)

The Read Security Register can be read the value of Security Register bits at any time (even in

program/erase/write status register-1 and write status register-2 condition) and continuously.

Secured OTP Indicator bit. The Secured OTP indicator bit shows the chip is locked by factory before ex-factory

or not. When it is ‘0’, it indicates non-factory lock, ‘1’ indicates factory-lock.

Lock-down Secured OTP (LDSO) bit. By writing Write Security Register instruction, the LDSO bit can be set to

“1” for customer lock-down purpose. However, once the bit it set to “1” (Lock-down), the LDSO bit and the 4 kbit

Secured OTP area cannot be updated any more. While it is in 4 kbit Secured OTP mode, array access is not

allowed to write.

Figure 8-61. Read Security Register instruction (SPI Mode)

Figure 8-62. Read Security Register instruction (QPI Mode)

Table 8-12. Security Register Definition

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

LDSO

(indicate if lock- down)

Secured

OTP indicator bit

Reserved Reserved

0 = not lock-down

1 = lock down

(cannot program/

erase OTP)

0 = non factory lock

1 = factory lock

Volatile

bit

Volatile

bit

Volatile

bit

Volatile

bit

Volatile

bit

Volatile

bit

Non- Volatile bit

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