S25FL129P Meet Spansion Inc., S25FL129P Datasheet - Page 52

• Manufacturer Part Number: S25FL129P
• Description: 128-mbit Cmos 3.0 Volt Flash Memory With 104-mhz Spi Serial Peripheral Interface Multi I/o Bus
• Manufacturer: Meet Spansion Inc.

10. OTP Regions
10.1
10.2
10.3
52
Programming OTP Address Space
Reading OTP Data
Locking OTP Regions
The OTP Regions are separately addressable from the main array and consists of two 8-byte (ESN), thirty
16-byte, and one 10-byte regions that can be individually locked.
The following general conditions should be noted with respect to the OTP Regions:
The protocol of the OTP Program command (42h) is the same as the Page Program command. Refer to
Table 9.1
times to any given OTP address, but this address space can never be erased. After a given OTP region is
programmed, it can be locked to prevent further programming with the OTP lock registers (refer to
Section
operations outside the valid OTP address range will be ignored.
The protocol of the OTP Read command (4Bh) is the same as that of the Fast Read command. Refer to
Table 9.1
the figure below. OTP Read operations outside the valid OTP address range will yield indeterminate data.
In order to permanently lock the ESN and OTP regions, individual bits at the specified addresses can be set
to lock specific regions of OTP memory, as highlighted in Figures
Standard part
Special order part
The two 8-byte ESN region is a special order part (please contact your local Spansion sales representative
for further details). The two 8-byte regions enable permanent part identification through an Electronic
Serial Number (ESN). The customer can utilize the ESN to pair a Flash device with the system CPU/ASIC
to prevent system cloning. The Spansion factory programs and locks the lower 8-byte ESN with a 64-bit
randomly generated, unique number. The upper 8-byte ESN is left blank for customer use or, if special
ordered, Spansion can program (and lock) in a unique customer ID.
The thirty 16-byte and one 10-byte OTP regions are open for the customer usage.
The thirty 16-byte, one 10-byte, and upper 8-byte ESN OTP regions can be individually locked by the end
user. Once locked, the data cannot changed. The locking process is permanent and cannot be undone.
On power-up, or following a hardware reset, or at the end of an OTPP or an OTPR command, the device
reverts to sending commands to the normal address space.
Reads or Programs outside of the OTP Regions will be ignored
The OTP Region is not accessible when the device is executing an Embedded Program or Embedded
Erase algorithm.
The ACC function is not available when accessing the OTP Regions.
The thirty 16-byte and one 10-byte OTP regions are left open for customer usage, but special care of the
OTP locking must be maintained, or else a malevolent user can permanently lock the OTP regions. This is
not a concern, if the OTP regions are not used.
10.3). The valid address range for OTP Program is depicted in the figure below. OTP Program
for the command description and protocol. The OTP Program command can be issued multiple
for the command description and protocol. The valid address range for OTP Reads is depicted in
Lock Register ESN1
(Bit 0)
1h
1h
D a t a
S25FL129P
S h e e t
Lock Register ESN2
(Bit 1)
1h/0h
1h
( P r e l i m i n a r y )
10.1
ESN1 Region Contains
Unique random pattern
and 10.2.
S25FL129P_00_04 November 2, 2009
0h
ESN2 Region Contains
programmed pattern
Factory/Customer
0h