ESMT
F25L16PA (2S)
Enter OTP Mode (ENSO)
The ENSO (B1H) instruction is for entering the additional 512
bytes secured OTP mode. The additional 512 bytes secured OTP
sector is independent from main array, which may use to store
unique serial number for system identifier. User must unprotect
whole array (BP0=BP1=BP2=BP3=0), prior to any Program
operation in OTP sector. After entering the secured OTP mode,
only the secured OTP sector can be accessed and user can only
follow the Read or Program procedure with OTP address range
(address bits [A23 –A9] must be “0”). The secured OTP data
cannot be updated again once it is lock down or has been
programmed. In secured OTP mode, WRSR command will
ignore the input data and lock down the secured OTP sector
(OTP_lock bit =1). To exit secured OTP mode, user must
execute WRDI command. RES can be used to verify the secured
OTP status as shown in Table 6.
Figure 19: Enter OTP Mode (ENSO) Sequence
OTP Sector Address
Size
Address Range
512 bytes
000000H ~ 0001FFH
Note: The OTP sector is an independent Sector.
Elite Semiconductor Memory Technology Inc.
Publication Date: Nov. 2012
Revision: 1.4
24/42
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
