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AT25SL321 データシート(PDF) 67 Page - Dialog Semiconductor

部品番号 AT25SL321
部品情報  32-Mbit, 1.7 V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O and QPI Support
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AT25SL321 データシート(HTML) 67 Page - Dialog Semiconductor

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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
x
x
x
x
x
x
LDSO
(indicate if lock- down)
Secured
OTP indicator bit
Reserved Reserved
Reserved Reserved
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
Non- Volatile bit



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