S29AL016M90FFIR10 View Datasheet(PDF) - Spansion Inc.

Part Name

Description

Manufacturer

S29AL016M90FFIR10

16 Megabit (2 M x 8-Bit/1 M x 16-Bit) 3.0 Volt-only Boot Sector Flash Memory featuring MirrorBit™ technology

Spansion Inc. 

SecSi (Secured Silicon) Sector Flash Memory Region

The SecSi (Secured Silicon) Sector feature provides a Flash memory region that

enables permanent part identification through an Electronic Serial Number

(ESN). The SecSi Sector is 256 bytes in length, and uses a SecSi Sector Indica-

tor Bit (DQ7) to indicate whether or not the SecSi Sector is locked when shipped

from the factory. This bit is permanently set at the factory and cannot be

changed, which prevents cloning of a factory locked part. This ensures the secu-

rity of the ESN once the product is shipped to the field.

The device is offered with the SecSi Sector either customer lockable (standard

shipping option) or factory locked (contact a sales office or representative for or-

dering information). The customer-lockable version is shipped with the SecSi

Sector unprotected, allowing customers to program the sector after receiving

the device. The customer-lockable version also has the SecSi Sector Indicator

Bit permanently set to a “0.” The factory-locked version is always protected

when shipped from the factory, and has the SecSi (Secured Silicon) Sector Indi-

cator Bit permanently set to a “1.” Thus, the SecSi Sector Indicator Bit prevents

customer-lockable devices from being used to replace devices that are factory

locked. Note that the ACC function and unlock bypass modes are not available

when the SecSi Sector is enabled.

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

Table 5. SecSi Sector Addressing

SecSi Sector Address Range

x16

x8

0F8000h–

0F8007h

0F8000h–

0F800Fh

0F8008h–

0F807Fh

0F8010h–

0F80FFh

Customer

Lockable

Determined by

customer

ESN Factory

Locked

ESN

Unavailable

ExpressFlash

Factory Locked

ESN or determined

by customer

Determined

by customer

The system accesses the SecSi Sector through a command sequence (see “En-

ter SecSi Sector/Exit SecSi Sector Command Sequence”). After the system has

written the Enter SecSi Sector command sequence, it may read the SecSi Sector

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

operation continues until the system issues the Exit SecSi 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: SecSi 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 SecSi sector.

The system may program the SecSi Sector using the write-buffer, accelerated

and/or unlock bypass methods, in addition to the standard programming com-

mand sequence. See Command Definitions.

Programming and protecting the SecSi Sector must be used with caution since,

once protected, there is no procedure available for unprotecting the SecSi Sec-

tor area and none of the bits in the SecSi Sector memory space can be modified

in any way.

The SecSi Sector area can be protected using one of the following procedures:

„ Write the three-cycle Enter SecSi Sector Region command sequence, and

then follow the in-system sector protect algorithm as shown in Figure 2, ex-

19

S29AL016M

S29AL016M_00A4 April 21, 2004

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