mx25l3255d Macronix International Co., mx25l3255d Datasheet - Page 11

• Manufacturer Part Number: mx25l3255d
• Description: Security Serial Flash
• Manufacturer: Macronix International Co.

II. Additional 4K-bit secured OTP for unique identifier: to provide 4K-bit one-time program area for setting device
P/N: PM1431
Table 2. 4K-bit Secured OTP Definition
unique serial number - Which may be set by factory or system customer. Please refer to table 2. 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 command), and going
through normal program procedure, and then exiting 4K-bit secured OTP mode by writing EXSO command.
- Customer may lock-down the customer lockable secured OTP by writing WRSCUR(write security register)
command to set customer lock-down bit1 as "1". Please refer to table of "security register definition" for security
register bit definition and table of "4K-bit secured OTP definition" for address range definition.
- Note: Once lock-down whatever by factory or customer, it cannot be changed any more. While in 4K-bit se-
cured OTP mode, array access is not allowed.
Address range
xxx000~xxx00F
xxx010~xxx1FF
3968-bit
128-bit
Size
ESN (electrical serial number)
Standard Factory Lock
11
N/A
MX25L3255D
Determined by customer
Customer Lock
REV. 0.03, MAR. 13, 2009