AM70PDL127CDH Datasheet, PDF(43/127 Page) SPANSION – Stacked Multi-Chip Package (MCP/XIP) Flash Memory, Data storage MirrorBit Flash, and pSRAM (XIP)

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AM70PDL127CDH Datasheet, PDF (43/127 Pages) SPANSION – Stacked Multi-Chip Package (MCP/XIP) Flash Memory, Data storage MirrorBit Flash, and pSRAM (XIP)

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ADVANCE INFORMATION

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 VID. During this mode, formerly protected

sectors can be programmed or erased by selecting the

sector addresses. Once VID is removed from the RE-

SET# pin, all the previously protected sectors are

protected again. Figure 2 shows the algorithm, and

Figure 19 shows the timing diagrams, for this feature.

While PPB lock is set, the device cannot enter the

Temporary Sector Unprotection Mode.

indicator bits (DQ6, DQ7) to indicate the fac-

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

The system accesses the SecSi Sector through a

command sequence (see âEnter SecSiâ¢ Sector/Exit

SecSi Sector Command Sequenceâ). 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.

START

RESET# = VID

(Note 1)

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

Notes:

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

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.

Figure 2. Temporary Sector Unprotect Operation

SecSiâ¢ (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

Factory-Locked Area (64 words)

The factory-locked area of the SecSi Sector

(000000h-00003Fh) is locked when the part 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 â1â. 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 AMDâs 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 â0â and can be permanently locked to â1â 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:

â Follow the SecSi Sector Protection Algorithm as

shown in Figure 3. This allows in-system protection

of the SecSi Sector without raising any device pin to

a high voltage. Note that this method is only appli-

cable to the SecSi Sector.

Once the SecSi Sector is locked and verified, the sys-

tem must write the Exit SecSi Sector Region com-

mand sequence to return to reading and writing the

remainder of the array.

November 24, 2003

Am70PDL127CDH/Am70PDL129CDH

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