S29GL128P90TFCR20 Spansion Inc., S29GL128P90TFCR20 Datasheet - Page 50

• Manufacturer Part Number: S29GL128P90TFCR20
• Description: IC 128M PAGE-MODE FLASH MEMORY
• Manufacturer: Spansion Inc.

10. Secured Silicon Sector Flash Memory Region
10.1
50
Factory Locked Secured Silicon Sector
The Secured Silicon Sector provides an extra Flash memory region that enables permanent part identification
through an Electronic Serial Number (ESN). The Secured Silicon Sector is 128 words in length and all
Secured Silicon reads outside of the 128-word address range returns invalid data. The Secured Silicon
Sector Indicator Bit, DQ7, (at Autoselect address 03h) is used to indicate whether or not the Secured Silicon
Sector is locked when shipped from the factory.
Please note the following general conditions:
 On power-up, or following a hardware reset, the device reverts to sending commands to the normal
 Reads outside of sector SA0 return memory array data.
 Sector SA0 is remapped from memory array to Secured Silicon Sector array.
 Once the Secured Silicon Sector Entry Command is issued, the Secured Silicon Sector Exit command
 The Secured Silicon Sector is not accessible when the device is executing an Embedded Program or
 The ACC function and unlock bypass modes are not available when the Secured Silicon Sector is enabled.
The Factory Locked Secured Silicon Sector is always protected when shipped from the factory and has the
Secured Silicon Sector Indicator Bit (DQ7) permanently set to a “1”. This prevents cloning of a factory locked
part and ensures the security of the ESN and customer code once the product is shipped to the field.
These devices are available pre-programmed with one of the following:
 A random, 8 Word secure ESN only within the Secured Silicon Sector (at addresses 000000H - 000007H)
 Both a random, secure ESN and customer code through the Spansion programming service.
Customers may opt to have their code programmed through the Spansion programming services. Spansion
programs the customer's code, with or without the random ESN. The devices are then shipped from the
Spansion factory with the Secured Silicon Sector permanently locked. Contact your local representative for
details on using Spansion programming services.
address space.
must be issued to exit Secured Silicon Sector Mode.
Embedded Erase algorithm.
Secured Silicon Sector
000008h–00007Fh
000000h–000007h
Address Range
Customer Lockable
S29GL-P MirrorBit
Table 10.1 Secured Silicon Sector Addresses
Determined by
customer
D a t a
®
Flash Family
ESN Factory Locked
Unavailable
S h e e t
ESN
S29GL-P_00_A13 November 17, 2010
ESN or determined by customer
ExpressFlash Factory Locked
Determined by customer