AM29LV160MT70RFI View Datasheet(PDF) - Advanced Micro Devices

Part Name

Description

Manufacturer

AM29LV160MT70RFI

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

Advanced Micro Devices 

Data Sheet

Secured Silicon Sector Flash Memory Region

The Secured Silicon Sector feature provides a Flash memory region that enables

permanent part identification 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 permanently set at the factory

and cannot be changed, which prevents cloning of a factory locked part. This en-

sures the security of the ESN once the product is shipped to the field.

The device is offered with the Secured Silicon Sector either customer lockable

(standard shipping option) or factory locked (contact a sales office or represen-

tative for ordering information). The customer-lockable version is shipped with

the Secured Silicon Sector unprotected, allowing customers to program the sec-

tor after receiving the device. The customer-lockable version also has the

Secured Silicon Sector Indicator Bit permanently set to a “0.” The factory-locked

version is always protected when shipped from the factory, and has the Secured

Silicon Sector Indicator Bit permanently set to a “1.” Thus, the Secured Silicon

Sector Indicator Bit prevents customer-lockable devices from being used to re-

place 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 device is allocated as follows:

Table 5. Secured Silicon Sector Addressing

Secured Silicon Sector Address

Range

x16

x8

0F8000h–

0F8007h

1F0000h–

1F000Fh

0F8008h–

0F807Fh

1F0010h–

1F00FFh

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 Secured Silicon Sector through a command sequence

(see “Enter Secured Silicon Sector/Exit Secured Silicon Sector Command Se-

quence”). After the system writes the Enter Secured Silicon Sector command

sequence, it may read the Secured Silicon Sector by using the addresses given

in Table 5. This mode of operation continues until the system issues the Exit Se-

cured Silicon Sector command sequence, or until power is removed from the

device. On power-up, or following a hardware reset, the device reverts to send-

ing 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” on page 23.

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.

18

Am29LV160M

25974B5 January 31, 2007

Share Link: