AM29LV065DU101REF datasheet(19/54 Pages) AMD

Part #	AM29LV065DU101REF

Description	64 Megabit (8 M x 8-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIOTM Control

PDF	54 Pages

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Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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19 / 54 page

February 16, 2006

Am29LV065D

Temporary Sector Group Unprotect

(Note: In this device, a sector group consists of four adjacent

sectors that are protected or unprotected at the same time

(see Table 4)).

This feature allows temporary unprotection of previ-

ously protected sector groups to change data in-sys-

tem. The Sector Group Unprotect mode is activated by

setting the RESET# pin to V

ID (8.5 V – 12.5 V). During

this mode, formerly protected sector groups can be

programmed or erased by selecting the sector group

addresses. Once V

ID is removed from the RESET#

pin, all the previously protected sector groups are

protected again. Figure 1 shows the algorithm, and

Figure 22 shows the timing diagrams, for this feature.

Figure 1.

Temporary Sector Group

Unprotect Operation

START

Perform Erase or

Program Operations

RESET# = V

Temporary Sector

Group Unprotect

Completed (Note 2)

RESET# = V

(Note 1)

Notes:

1. All protected sector groups unprotected.

2. All previously protected sector groups are protected

once again.

AM29LV065DU101REF Datasheet(PDF) 19 Page - Advanced Micro Devices