AM29LV641MH Datasheet, PDF(17/60 Page) SPANSION – 64 Megabit (4 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

AM29LV641MH Datasheet, PDF (17/60 Pages) SPANSION – 64 Megabit (4 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control

◁

DATASHEET

Sector Group Protection and

Unprotection

The hardware sector group protection feature disables

both program and erase operations in any sector

group. In this device, a sector group consists of four

adjacent sectors that are protected or unprotected at

the same time (see Table 4). The hardware sector

group unprotection feature re-enables both program

and erase operations in previously protected sector

groups. Sector group protection/unprotection can be

implemented via two methods.

Sector protection/unprotection requires VID on the RE-

SET# pin only, and can be implemented either in-sys-

tem or via programming equipment. Figure 2 shows

the algorithms and Figure 25 shows the timing dia-

gram. This method uses standard microprocessor bus

cycle timing. For sector group unprotect, all unpro-

tected sector groups must first be protected prior to

the first sector group unprotect write cycle.

The device is shipped with all sector groups unpro-

tected. AMD offers the option of programming and pro-

tecting sector groups at its factory prior to shipping the

device through AMDâs ExpressFlashâ¢ Service. Con-

tact an AMD representative for details.

It is possible to determine whether a sector group is

protected or unprotected. See the Autoselect Mode

section for details.

Table 4. Sector Group Protection/Unprotection

Address Table

Sector Group

A21âA17

SA0âSA3

SA4âSA7

00000

00001

SA8âSA11

SA12âSA15

00010

00011

SA16âSA19

SA20âSA23

00100

00101

SA24âSA27

SA28âSA31

00110

00111

SA32âSA35

SA36âSA39

SA40âSA43

01000

01001

01010

SA44âSA47

SA48âSA51

01011

01100

SA52âSA55

SA56âSA59

01101

01110

SA60âSA63

SA64âSA67

01111

10000

SA68âSA71

SA72âSA75

10001

10010

SA76âSA79

SA80âSA83

SA84âSA87

10011

10100

10101

SA88âSA91

SA92âSA95

10110

10111

SA96âSA99

SA100âSA103

11000

11001

SA104âSA107

SA108âSA111

11010

11011

SA112âSA115

SA116âSA119

SA120âSA123

11100

11101

11110

SA124âSA127

11111

Note: All sector groups are 128 Kwords in size.

December 21, 2005

Am29LV641MH/L

▷