S25FL128SAGMFI011 Spansion, S25FL128SAGMFI011 Datasheet - Page 56

• Manufacturer Part Number: S25FL128SAGMFI011
• Description: Flash 128Mb 3V 133MHz Serial NOR Flash
• Manufacturer: Spansion

Specifications of S25FL128SAGMFI011

• Rohs: yes

8.3
8.4
56
ID-CFI Address Space
OTP Address Space
The RDID command (9Fh) reads information from a separate flash memory address space for device
identification (ID) and Common Flash Interface (CFI) information. See
Interface (ID-CFI) Address Map on page 133
The ID-CFI address space is programmed by Spansion and read-only for the host system.
Each S25FL128S and S25FL256S memory device has a 1024-byte One Time Program (OTP) address space
that is separate from the main flash array. The OTP area is divided into 32, individually lockable, 32-byte
aligned and length regions.
In the 32-byte region starting at address zero:
 The 16 lowest address bytes are programmed by Spansion with a 128-bit random number. Only Spansion
 The next 4 higher address bytes (OTP Lock Bytes) are used to provide one bit per OTP region to
 The next higher 12 bytes of the lowest address region are Reserved for Future Use (RFU). The bits in
The remaining regions are erased when shipped from Spansion, and are available for programming of
additional permanent data.
Refer to
The OTP memory space is intended for increased system security. OTP values, such as the random number
programmed by Spansion, can be used to “mate” a flash component with the system CPU/ASIC to prevent
device substitution.
The configuration register FREEZE (CR1[0]) bit protects the entire OTP memory space from programming
when set to 1. This allows trusted boot code to control programming of OTP regions then set the FREEZE bit
to prevent further OTP memory space programming during the remainder of normal power-on system
operation.
is able to program these bytes.
permanently protect each region from programming. The bytes are erased when shipped from Spansion.
After an OTP region is programmed, it can be locked to prevent further programming, by programming the
related protection bit in the OTP Lock Bytes.
these RFU bytes may be programmed by the host system but it must be understood that a future device
may use those bits for protection of a larger OTP space. The bytes are erased when shipped from
Spansion.
Figure 8.1, OTP Address Space on page 57
S25FL128S and S25FL256S
D a t a
for the tables defining the contents of the ID-CFI address space.
for a pictorial representation of the OTP memory space.
S h e e t
Device ID and Common Flash
S25FL128S_256S_00_05 July 12, 2012