S71GS256 datasheet(60/195 Pages) SPANSION

60 / 195 page

S29GLxxxN MirrorBitTM Flash Family

S29GLxxxN_MCP_A1 December 15, 2004

Advan ce

In form ati o n

The Secured Silicon sector address space in this device is allocated as follows:

The system accesses the Secured Silicon Sector through a command sequence

(see “Write Protect (WP#)”). After the system has written the Enter Secured Sil-

icon Sector command sequence, it may read the Secured Silicon Sector by using

the addresses normally occupied by the first sector (SA0). This mode of operation

continues until the system issues the Exit Secured Silicon Sector command se-

quence, or until power is removed from the device. On power-up, or following a

hardware reset, the device reverts to sending commands to sector SA0.

Customer Lockable: Secured Silicon Sector NOT Programmed or

Protected At the Factory

Unless otherwise specified, the device is shipped such that the customer may

program and protect the 256-byte Secured Silicon sector.

The system may program the Secured Silicon Sector using the write-buffer, ac-

celerated and/or unlock bypass methods, in addition to the standard

programming command sequence. See “Command Definitions” .

Programming and protecting the Secured Silicon Sector must be used with cau-

tion since, once protected, there is no procedure available for unprotecting the

Secured Silicon Sector area and none of the bits in the Secured Silicon Sector

memory space can be modified in any way.

The Secured Silicon Sector area can be protected using one of the following

procedures:

Write the three-cycle Enter Secured Silicon Sector Region command se-

quence, and then follow the in-system sector protect algorithm, except that

RESET# may be at either VIH or VID. This allows in-system protection of the

Secured Silicon Sector without raising any device pin to a high voltage. Note

that this method is only applicable to the Secured Silicon Sector.

To verify the protect/unprotect status of the Secured Silicon Sector, follow the

algorithm.

Once the Secured Silicon Sector is programmed, locked and verified, the system

must write the Exit Secured Silicon Sector Region command sequence to return

to reading and writing within the remainder of the array.

Factory Locked: Secured Silicon Sector Programmed and

Protected At the Factory

In devices with an ESN, the Secured Silicon Sector is protected when the device

is shipped from the factory. The Secured Silicon Sector cannot be modified in any

way. An ESN Factory Locked device has an 16-byte random ESN at addresses

000000h–000007h. Please contact your sales representative for details on order-

ing ESN Factory Locked devices.

Customers may opt to have their code programmed by the factory through the

ExpressFlash service (Express Flash Factory Locked). The devices are then

shipped from the factory with the Secured Silicon Sector permanently locked.

Contact your sales representative for details on using the ExpressFlash service.

Secured Silicon Sector

Address Range

Customer Lockable

ESN Factory Locked

ExpressFlash

Factory Locked

000000h–000007h

Determined by customer

ESN

ESN or determined by

customer

000008h–00007Fh

Unavailable

Determined by customer

S71GS256 Datasheet(PDF) 60 Page - SPANSION

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