AM29LV160M datasheet(21/63 Pages) AMD

21 / 63 page

January 31, 2007 25974B5

Am29LV160M

Data

Sheet

The Secured Silicon Sector area can be protected using one of the following

procedures:

Write the three-cycle Enter Secured Silicon Sector Region command se-

quence, and then follow the in-system sector protect algorithm as shown in

Figure 2, on page 17, except that RESET# may be at either VIH or VID. This

allows in-system protection of the Secured Silicon Sector without raising any

device pin to a high voltage. Note that this method is only applicable to the

Secured Silicon Sector.

To verify the protect/unprotect status of the Secured Silicon Sector, follow the

algorithm shown in Figure 3.

Once the Secured Silicon Sector is programmed, locked and verified, the system

must write the Exit Secured Silicon Sector Region command sequence to return

to reading and writing within the remainder of the array.

Factory Locked: Secured Silicon Sector Programmed and

Protected At the Factory

In devices with an ESN, the Secured Silicon Sector is protected when the device

is shipped from the factory. The Secured Silicon Sector cannot be modified in any

way. An ESN Factory Locked device has a 16-byte random ESN at addresses

0F8000h–0F8007h. 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 Secured Silicon Sector permanently

locked. Contact an sales office or representative for details on using the Ex-

pressFlash service.

Figure 3. Secured Silicon 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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