參數(shù)資料
型號： S29NS-P
廠商： Spansion Inc.
英文描述： MirrorBit Flash Family
中文描述： MirrorBit閃存系列
文件頁數(shù)： 61/86頁
文件大?。?/td> 2234K
代理商： S29NS-P
February 20, 2007 S29NS-P_00_A1
S29NS-P MirrorBit
TM
Flash Family
61
D a t a
S h e e t
( A d v a n c e
I n f o r m a t i o n )
9.
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.
9.1
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.
9.2
Customer Secured Silicon Sector
The Customer Secured Silicon Sector is typically shipped unprotected (DQ6 set to
0
), allowing customers to
utilize that sector in any manner they choose. If the security feature is not required, the Customer Secured
Silicon Sector can be treated as an additional Flash memory space.
Please note the following:
Once the Customer Secured Silicon Sector area is protected, the Customer Indicator Bit is permanently
set to
1
.
Table 9.1
Secured Silicon Sector
Secure Sector
Addresses
Sector
Sector Size
Address Range
Customer
128 words
000080h-0000FFh
Factory
128 words
000000h-00007Fh
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