L6402ML11RI datasheet(21/57 Pages) AMD

21 / 57 page

January 23, 2006

Am29LV6402M

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 128 doublewords/256

words in length, and uses SecSi Sector Indicator Bits

(DQ7 and DQ15) to indicate whether or not the SecSi

Sector is locked when shipped from the factory. These

bits are permanently 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 SecSi Sector either

fa ctor y locke d or custom er lock able. T he fa c-

tory-locked version is always protected when shipped

from the factory, and has the SecSi (Secured Silicon)

Sector Indicator Bits permanently set to a “1.” The cus-

tomer-lockable version is shipped with the SecSi Sec-

tor unprotected, allowing customers to program the

sector after receiving the device. The customer-lock-

able version also has the SecSi Sector Indicator Bit

permanently set to a “0.” Thus, the SecSi Sector Indi-

cator Bits prevent customer-lockable devices from

being used to replace devices that are factory locked.

The SecSi sector address space in this device is allo-

cated as follows:

Table 5.

SecSi Sector Contents

The system accesses the SecSi Sector through a

command sequence (see “Enter SecSi Sector/Exit

SecSi Sector Command Sequence”). After the system

has written the Enter SecSi Sector command se-

quence, it may read the SecSi Sector by using the ad-

dresses normally occupied by the first sector (SA0).

This mode of operation continues until the system is-

sues the Exit SecSi Sector command sequence, 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.

Factory Locked: SecSi Sector Programmed and

Protected At the Factory

In devices with an ESN, the SecSi Sector is protected

when the device is shipped from the factory. The SecSi

Sector cannot be modified in any way. A factory locked

device has an 8-doubleword/16-word random ESN at

addresses 000000h–000007h.

Customers may opt to have their code programmed by

AMD through the AMD ExpressFlash service. The de-

vices are then shipped from AMD’s factory with the

SecSi Sector permanently locked. Contact an AMD

representative for details on using AMD’s Express-

Flash service.

Customer Lockable: SecSi Sector NOT

Programmed or Protected At the Factory

As an alternative to the factory-locked version, the de-

vice may be ordered such that the customer may pro-

gram and protect the 128-doubleword/256 word SecSi

sector.

The system may program the SecSi Sector using the

write-buffer, accelerated and/or unlock bypass meth-

ods, in addition to the standard programming com-

mand sequence. See To reduce power consumption

read Lower Byte only..

Programming and protecting the SecSi Sector must be

used with caution since, once protected, there is no

procedure available for unprotecting the SecSi Sector

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-

cept that RESET# may be at either V

IH or VID. This

allows in-system protection of the SecSi Sector

without raising any device pin to a high voltage.

Note that this method is only applicable to the SecSi

Sector.

■ To verify the protect/unprotect status of the SecSi

Sector, follow the algorithm shown in Figure 3.

Once the SecSi Sector is programmed, locked and

verified, the system must write the Exit SecSi Sector

Region command sequence to return to reading and

writing within the remainder of the array.

SecSi Sector

Address Range

Standard

Factory

Locked

ExpressFlash

Factory Locked

Customer

Lockable

x32

x16

000000h–

000007h

000000h–

00000Fh

ESN

ESN or

determined by

customer

Determined by

customer

000008h–

00007Fh

000010h–

0000FFh

Unavailable

Determined by

customer

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