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25L1605 View Datasheet(PDF) - Macronix International

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25L1605 Datasheet PDF : 56 Pages
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MX25L1605D
MX25L3205D
MX25L6405D
(19) Read Security Register (RDSCUR)
The RDSCUR 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/write security register condition) and continuously.
The sequence of issuing RDSCUR instruction is : CS# goes low-> send ing RDSCUR instruction -> Security Register data
out on SO-> CS# goes high.
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 is set to "1" (lock-down), the LDSO bit and the 512-bit Secured OTP area cannot
be update any more. While it is in 512-bit secured OTP mode, array access is not allowed.
Table 8. Security Register Definition
bit7
bit6
bit5
x
x
x
reserved
reserved
reserved
volatile bit
volatile bit
volatile bit
bit4
x
reserved
volatile bit
bit3
x
reserved
volatile bit
bit2
x
reserved
volatile bit
bit1
bit0
LDSO
(indicate if Secrured OTP
lock-down indicator bit
0 = not lock-
down
1 = lock-down 0 = non-
(cannot
factory lock
program/erase 1 = factory
OTP)
lock
non-volatile bit non-volatile bit
(20) Write Security Register (WRSCUR)
The WRSCUR instruction is for changing the values of Security Register Bits. Unlike write status register, the WREN
instruction is not required before sending WRSCUR instruction. The WRSCUR instruction may change the values of bit1
(LDSO bit) for customer to lock-down the 512-bit Secured OTP area. Once the LDSO bit is set to "1", the Secured OTP
area cannot be updated any more.
The sequence of issuing WRSCUR instruction is :CS# goes low-> sending WRSCUR instruction -> CS# goes high.
The CS# must go high exactly at the boundary; otherwise, the instruction will be rejected and not executed.
P/N: PM1290
REV. 1.4, OCT. 01, 2008
26
 

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