AM29LV160M datasheet(21/60 Pages) AMD

21 / 60 page

August 11, 2003 25974B0

Am29LV160M

Prelimin ary

cept that RESET# may be at either VIH or VID. This allows in-system protec-

tion 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 algo-

rithm 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.

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. An ESN Fac-

tory Locked device has a 16-byte random ESN at addresses 000000h–000007h.

Please contact your local sales office or representative for details on ordering ESN

Factory Locked devices.

Customers may opt to have their code programmed by the manufacturer

through the ExpressFlash service (Express Flash Factory Locked). The devices

are then shipped from the factory with the SecSi Sector permanently locked.

Contact an sales office or representative for details on using the ExpressFlash

service.

Figure 3. SecSi Sector Protect Verify

Write 60h to

any address

Write 40h to SecSi

Sector address

with A6 = 0,

A1 = 1, A0 = 0

START

RESET# =

VIH or VID

Wait 1 ms

Read from SecSi

Sector address

with A6 = 0,

A1 = 1, A0 = 0

If data = 00h,

SecSi Sector is

unprotected.

If data = 01h,

SecSi Sector is

protected.

Remove VIH or VID

from RESET#

Write reset

command

SecSi Sector

Protect Verify

complete

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