S29GL128P90FFI012 参数 Datasheet PDF下载

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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 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

address space.

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

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.

The ACC function and unlock bypass modes are not available when the Secured Silicon Sector is enabled.

Table 10.1

Secured Silicon Sector Addresses

Secured Silicon Sector

Address Range

000000h–000007h

000008h–00007Fh

Customer Lockable

Determined by

customer

ESN Factory Locked

ESN

Unavailable

ExpressFlash Factory Locked

ESN or determined by customer

Determined by customer

10.1

Factory Locked Secured Silicon Sector

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.

10.2

Customer Lockable Secured Silicon Sector

The Customer Lockable Secured Silicon Sector is always shipped unprotected (DQ7 set to “0”), allowing

customers to utilize that sector in any manner they choose. If the security feature is not required, the Secured

Silicon Sector can be treated as an additional Flash memory space.

Please note the following:

Once the Secured Silicon Sector area is protected, the Secured Silicon Sector Indicator Bit is permanently

set to “0.”

The Secured Silicon Sector can be read any number of times, but can be programmed and locked only

once. The Secured Silicon Sector lock must be used with caution as once locked, there is no procedure

available for unlocking the Secured Silicon Sector area and none of the bits in the Secured Silicon Sector

memory space can be modified in any way.

The accelerated programming (ACC) and unlock bypass functions are not available when the Secured

Silicon Sector is enabled.

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S29GL-P MirrorBit

®

Flash Family

S29GL-P_00_A7 November 8, 2007