S25FL032P datasheet(49/64 Pages) SPANSION

49 / 64 page

February 12, 2009 S25FL032P_00_02

S25FL032P

Data

Sheet

(Preliminar y )

10. 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 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.

The following general conditions should be noted with respect to the OTP Regions:

On power-up, or following a hardware reset, the device reverts to sending commands to the normal

address space.

Reads 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 the Secured Silicon Sector is enabled.

The two 8-byte ESN region is a special order part (please contact your local Spansion sales representative

for further details); otherwise, these regions are programmed to all zeroes and locked prior to shipping from

the Spansion factory. 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.

10.1

Programming OTP Address Space

The protocol of the OTP Program command (42h) is the same as the Page Program command. Refer to

Table 9.1 for the command description and protocol. The OTP Program command can be issued multiple

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 bits (refer to Section 10.3).

The valid address range for OTP Program is depicted in the figure below. OTP Program operations outside

the valid OTP address range will be ignored.

10.2

Reading OTP Data

The protocol of the OTP Read command (4Bh) is the same as that of the Fast Read command. Refer to

Table 9.1 for the command description and protocol. The valid address range for OTP Reads is depicted in

the figure below. OTP Read operations outside the valid OTP address range will yield indeterminate data.

10.3

Locking OTP Regions

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 10.1 and 10.2.

S25FL032P Datasheet(PDF) 49 Page - SPANSION

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