AM29LV640MU datasheet(18/58 Pages) AMD

Part #	AM29LV640MU

Description	64 Megabit (4 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with

PDF	58 Pages

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Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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18 / 58 page

June 12, 2003

Am29LV640MU

AD V A NCE

INF O R M A T IO N

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 VID. During this mode, for-

merly protected sector groups can be programmed or

erased by selecting the sector group addresses. Once

ID is removed from the RESET# pin, all the previ-

ously 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.

AM29LV640MU Datasheet(PDF) 18 Page - Advanced Micro Devices