AM29LV652D datasheet(23/55 Pages) SPANSION

Part #	AM29LV652D

Description	128 Megabit (16 M x 8-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO Control

PDF	55 Pages

Scroll/Zoom	100%

Manufacturer	SPANSION [SPANSION]

Direct Link	http://www.spansion.com

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23 / 55 page

October 29, 2004

Am29LV652D

PRELI M INARY

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 5, on page 20)).

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 RESET# to VID (8.5 V – 12.5 V). During this

mode, formerly protected sector groups can be pro-

grammed or erased by selecting the sector group ad-

dresses. Once VID is removed from RESET#, all the

pr ev i o u s l y

pr ot e c te d

s e c t o r

g r ou ps

ar e

protected again. Figure 1, on page 21 shows the algo-

rithm, and Figure 21, on page 46 shows the timing dia-

grams, for this feature.

Figure 1. Temporary Sector Group

Unprotect Operation

START

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Group Unprotect

Completed (Note 2)

RESET# = VID

(Note 1)

Notes:

1. All protected sector groups unprotected.

2. All previously protected sector groups are protected

once again.

AM29LV652D Datasheet(PDF) 23 Page - SPANSION