M750000009 datasheet(46/136 Pages) SPANSION

46 / 136 page

Am75PDL191CHH/Am75PDL193CHH

February 5, 2004

ADV ANCE

I N FO RMAT I O N

Temporary Sector Unprotect

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system. The

Sector Unprotect mode is activated by setting the RE-

SET# pin to V

ID. During this mode, formerly protected

sectors can be programmed or erased by selecting the

sector addresses. Once V

ID is removed from the RE-

SET# pin, all the previously protected sectors are

protected again. Figure 2 shows the algorithm, and

Figure 23 shows the timing diagrams, for this feature.

While PPB lock is set, the device cannot enter the

Temporary Sector Unprotection Mode.

Figure 2.

Temporary Sector Unprotect Operation

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 128-word SecSi sector is divided into 64

factory-lockable words that can be programmed and

locked by the customer. The SecSi sector is located at

addresses 000000h-00007Fh in both Persistent Pro-

tection mode and Password Protection mode. It uses

i n d i cato r bi ts ( D Q6 , D Q 7 ) to in di ca te the fa c-

tory-locked and customer-locked status of the part.

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 boot sectors. This

mode of operation continues until the system issues

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 send-

ing commands to the normal address space.

Factory-Locked Area (64 words)

The fa c t o r y - lo c ked a r ea o f t h e S e c S i S e c t or

(00 00 00 h-0 00 03 Fh) is locked wh en the pa r t is

shipped, whether or not the area was programmed at

the factory. The SecSi Sector Factory-locked Indicator

Bit (DQ7) is permanently set to a “1”. AMD offers the

ExpressFlash service to program the factory-locked

area with a random ESN, a customer-defined code, or

any combination of the two. Because only AMD can

program and protect the factory-locked area, this

method ensures the security of the ESN once the

product is shipped to the field. Contact an AMD repre-

sentative for details on using AMD’s ExpressFlash ser-

vice.

Note that the ACC function and unlock bypass

modes are not available when the SecSi Sector is en-

abled.

Customer-Lockable Area (64 words)

The customer-lockable area of the SecSi Sector

(000040h-00007Fh) is shipped unprotected, which al-

lows the customer to program and optionally lock the

area as appropriate for the application. The SecSi

Sector Customer-locked Indicator Bit (DQ6) is shipped

as “0” and can be permanently locked to “1” by issuing

the SecSi Protection Bit Program Command. The

SecSi Sector can be read any number of times, but

can be programmed and locked only once. Note that

the accelerated programming (ACC) and unlock by-

pass functions are not available when programming

the SecSi Sector.

The Customer-lockable SecSi Sector area can be pro-

tected using one of the following procedures:

■ Follow the SecSi Sector Protection Algorithm as

shown in . This allows in-system protection of the

SecSi Sector without raising any device pin to a

high voltage. Note that this method is only applica-

ble to the SecSi Sector.

Notes:

1. All protected sectors unprotected (If WP#/ACC = V

IL,

sectors 0, 1, 268, 269 in PDL 127 or in SA1-133,

SA1-134, SA2-0, SA2-1 in PDL 129.will remain

protected).

2. All previously protected sectors are protected once

again.

START

Perform Erase or

Program Operations

RESET# = V

Temporary Sector

Unprotect Completed

(Note 2)

RESET# = V

(Note 1)

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