AM29LV320MH101PCF datasheet(21/59 Pages) AMD

21 / 59 page

January 31, 2007 26517B4

Am29LV320MH/L

D A TA

SH EET

Secured Silicon Sector Flash

Memory Region

The Secured Silicon Sector feature provides a Flash

memory region that enables permanent part identifica-

tion through an Electronic Serial Number (ESN). The

Secured Silicon Sector is 256 bytes in length, and

uses a Secured Silicon Sector Indicator Bit (DQ7) to

indicate whether or not the Secured Silicon Sector is

locked when shipped from the factory. This bit is per-

manently set at the factory and cannot be changed,

which prevents cloning of a factory locked part. This

ensures the security of the ESN once the product is

shipped to the field.

AMD offers the device with the Secured Silicon Sector

either customer lockable (standard shipping option) or

factory locked (contact an AMD sales representative

for ordering information). The customer-lockable ver-

sion is shipped with the Secured Silicon Sector unpro-

tected, allowing customers to program the sector after

receiving the device. The customer-lockable version

also has the Secured Silicon Sector Indicator Bit per-

manently set to a “0.” The factory-locked version is al-

ways protected when shipped from the factory, and

has the Secured Silicon Sector Indicator Bit perma-

nently set to a “1.” Thus, the Secured Silicon Sector In-

dicator 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 Secured Silicon Sector is

enabled.

The Secured Silicon sector address space in this de-

vice is allocated as follows:

The system accesses the Secured Silicon Sector

through a command sequence (see “Enter Secured

Sil i con Sector/Exit Secured Si licon Sector

Command Sequence”). After the system has written

the Enter Secured Silicon 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 is-

sues 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 re-

verts 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, accelerated and/or unlock by-

pass methods, in addition to the standard program-

ming command sequence. See Command Definitions.

Programming and protecting the Secured Silicon Sec-

tor must be used with caution 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 modi-

fied 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 sequence, and then follow the

in-system sector protect algorithm as shown in Fig-

ure 2, except that RESET# may be at either V

IH or

ID. 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 applica-

ble to the Secured Silicon Sector.

■ To verify the protect/unprotect status of the Secured

Silicon Sector, follow the algorithm shown in Figure

Once the Secured Silicon Sector is programmed,

locked and verified, the system must write the Exit Se-

cured 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 local AMD sales representative for details

on ordering ESN Factory Locked devices.

Customers may opt to have their code programmed by

AMD through the AMD ExpressFlash service (Express

Flash Factory Locked). The devices are then shipped

from AMD’s factory with the Secured Silicon Sector

permanently locked. Contact an AMD representative

for details on using AMD’s ExpressFlash service.

Table 5.

Secured Silicon Sector Contents

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

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