FM25S16 FIDELIX, FM25S16 Datasheet - Page 48

• Manufacturer Part Number: FM25S16
• Description: 16m-bit Serial Flash Memory With 4kb Sectors, Single I/o Spi
• Manufacturer: FIDELIX

11.3 4K-bit Secured OTP
It’s for unique identifier to provide 4K-bit one-time-program area for setting device unique serial
number which may be set by factory or system customer. Please refer to table of “4K-bit secured
OTP definition”.
- Security register bit 0 indicates whether the chip is locked by factory or not.
- To program the 4K-bit secured OTP by entering 4K-bit secured OTP mode (with ENSO
- Customer may lock-down bit1 as “1”. Please refer to “table of security register definition” for
- Note. Once lock-down whatever by factory or customer, it cannot be changed any more. While
4K-bit secured OTP definition
command) and going through normal program procedure, and then exiting 4K-bit secured OTP
mode by writing EXSO command
security register bit definition and table of “4K-bit secured OTP definition” for address range
definition.
in 4K-bit secured OTP mode, array access is not allowed to write.
000000 ~ 00000F
000010 ~ 0001FF
Address range
3968-bit
128-bit
Size
(Electrical Serial Number)
Factory Lock
Standard
ESN
N/A
Rev.07 (Mar.18. 2011)
Determined by customer
Customer Lock
FM25S16
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