AM29LV6402M datasheet(18/57 Pages) SPANSION

Part #	AM29LV6402M

Description	128 Megabit (4 M x 32-Bit/8 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with Versatile I/O Control

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Am29LV6402M

January 23, 2006

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 V

ID 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 24 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 AMD’s ExpressFlash™ 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

A21–A15

SA0

0000000

SA1

0000001

SA2

0000010

SA3

0000011

SA4–SA7

00001xx

SA8–SA11

00010xx

SA12–SA15

00011xx

SA16–SA19

00100xx

SA20–SA23

00101xx

SA24–SA27

00110xx

SA28–SA31

00111xx

SA32–SA35

01000xx

SA36–SA39

01001xx

SA40–SA43

01010xx

SA44–SA47

01011xx

SA48–SA51

01100xx

SA52–SA55

01101xx

SA56–SA59

01110xx

SA60–SA63

01111xx

SA64–SA67

10000xx

SA68–SA71

10001xx

SA72–SA75

10010xx

SA76–SA79

10011xx

SA80–SA83

10100xx

SA84–SA87

10101xx

SA88–SA91

10110xx

SA92–SA95

10111xx

SA96–SA99

11000xx

SA100–SA103

11001xx

SA104–SA107

11010xx

SA108–SA111

11011xx

SA112–SA115

11100xx

SA116–SA119

11101xx

SA120–SA123

11110xx

SA124

1111100

SA125

1111101

SA126

1111110

SA127

1111111

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