MX25R1635F Datasheet, PDF (55/88 Pages) Macronix International – Wide Vcc Range, 16M-BIT

ADVANCED INFORMATION
MX25R1635F
Program Fail Flag bit. While a program failure happened, the Program Fail Flag bit would be set. If the program
operation fails on a protected memory region, this bit will also be set. This bit can be the failure indication of one or
more program operations. This fail flag bit will be cleared automatically after the next successful program operation.
Erase Fail Flag bit. While an erase failure happened, the Erase Fail Flag bit would be set. If the erase operation
fails on a protected memory region, this bit will also be set. This bit can be the failure indication of one or more erase
operations. This fail flag bit will be cleared automatically after the next successful erase operation.
Table 8. Security Register Definition
bit7
bit6
Reserved E_FAIL
0=normal
Erase
-
succeed
1=indicate
Erase failed
(default=0)
x
Volatile bit
bit5
P_FAIL
0=normal
Program
succeed
1=indicate
Program
failed
(default=0)
Volatile bit
bit4
Reserved
-
bit3
bit2
bit1
bit0
ESB
(Erase
Suspend bit)
PSB
(Program
Suspend bit)
LDSO
(lock-down 1^st
4K-bit Secured
OTP)
Secured OTP
Indicator bit
(2^nd 4K-bit
Secured OTP)
0=Erase
is not
0=Program
is not
0 = not
lockdown
0 = nonfactory
lock
suspended
1= Erase
suspended
(default=0)
suspended
1= Program
suspended
(default=0)
1 = lock-down
(cannot
program/erase
OTP)
1 = factory
lock
Volatile bit Volatile bit Volatile bit non-volatile bit non-volatile bit
Read Only Read Only
Read Only Read Only
OTP
Read Only
9-29. Write Security Register (WRSCUR)
The WRSCUR instruction is for changing the values of Security Register Bits. The WREN (Write Enable) instruction
is required before issuing WRSCUR instruction. The WRSCUR instruction may change the values of bit1 (LDSO bit)
for customer to lock-down the 1^st 4K-bit Secured OTP area. Once the LDSO bit is set to "1", the 1^st 4K-bit 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 SIO[3:1] are "don't care".
The CS# must go high exactly at the boundary; otherwise, the instruction will be rejected and not executed.
P/N: PM2138
REV. 0.01, FEB. 06, 2015
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