S29WS-P Datasheet, PDF (59/89 Pages) SPANSION – 512/256/128 Mb (32/16/8 M x 16 bit) 1.8 V Burst Simultaneous Read/Write MirrorBit Flash Memory

Data Sheet (Advance Information)
10. Secured Silicon Sector Flash Memory Region
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 256 words in length that consists
of 128 words for factory data and 128 words for customer-secured areas. All Secured Silicon reads outside of
the 256-word address range returns invalid data. The Factory Indicator Bit, DQ7, (at Autoselect address 03h)
is used to indicate whether or not the Factory Secured Silicon Sector is locked when shipped from the factory.
The Customer Indicator Bit (DQ6) is used to indicate whether or not the Customer Secured Silicon Sector is
locked when shipped from the factory.
Please note the following general conditions:
„ While Secured Silicon Sector access is enabled, simultaneous operations are allowed except for Bank 0.
„ On power-up, or following a hardware reset, the device reverts to sending commands to the normal
address space.
„ Reads can be performed in the Asynchronous or Synchronous mode.
„ Burst mode reads within Secured Silicon Sector wrap from address FFh back to address 00h.
„ Reads outside of sector 0 return memory array data.
„ Continuous burst read past the maximum address is undefined.
„ Sector 0 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
must be issued to exit Secured Silicon Sector Mode.
„ The Secured Silicon Sector is not accessible when the device is executing an Embedded Program or
Embedded Erase algorithm.
Table 10.1 Secured Silicon Sector Addresses
Sector
Customer
Factory
Sector Size
128 words
128 words
Address Range
000080h-0000FFh
000000h-00007Fh
10.1
Factory Secured Silicon Sector
The Factory Secured Silicon Sector is always protected when shipped from the factory and has the Factory
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 Factory Secured Silicon Sector
„ Customer code within the Customer Secured Silicon Sector through the Spansion^TM programming service.
„ 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 Factory Secured Silicon Sector and Customer Secured Silicon Sector permanently
locked. Contact your local representative for details on using Spansion programming services.
November 8, 2006 S29WS-P_00_A7
S29WS-P
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