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FM25D04C-1ACB2R Просмотр технического описания (PDF) - FIDELIX

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FM25D04C-1ACB2R 32M-BIT Serial Flash Memory with 4KB Sectors, Dual and QuadI/O SPI FIDELIX
FIDELIX FIDELIX
FM25D04C-1ACB2R Datasheet PDF : 61 Pages
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FM25Q32
11.2.29 Read Security Register (2Bh)
The Read Security Register instruction is for reading the value of Security Register bits. The Read
Security Register can be read at any time (even in program/erase/write status register condition)
and continuously.
The definition of the Security Register bits is as below:
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 WRSCUR instruction, the LDSO bit may be set
to “1” for customer lock-down purpose. However, once the bit it set to “1” (Lock-down), the LDSO
bit and the 4K-bit Secured OTP area cannot be updated any more. While it is in 4K-bit Secured
OTP mode, array access is not allowed to write.
/CS
CLK
Mode 3
Mode 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Instruction (2Bh)
DI
Security Register out
Security Register out
DO
=MSB
7 65 4 321 0765 4 321 0 7
Figure 29. Read Security Register instruction sequence
Security Register Definition
Bit7
Bit6
Bit5
x
x
x
reserved reserved reserved
Volatile Volatile Volatile
bit
bit
bit
Bit4
x
reserved
Volatile
bit
Bit3
x
reserved
Volatile
bit
Bit2
x
reserved
Volatile
bit
Bit1
LDSO
(indicate if
lock-
down)
0 = not
lock-down
1 = lock-
down(can
not
program/e
rase OTP)
Non-
Volatile bit
Bit0
Secured
OTP
indicator
bit
0 = non
factory
lock
1 = factory
lock
Non-
Volatile bit
preliminary(Aug.18.2010) 46
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