AM29LV033MU datasheet(16/56 Pages) AMD

16 / 56 page

Am29LV033MU

November 11, 2002

ADV ANCE

I N FO RMAT I O N

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

protecting sector groups at its factory prior to shipping

the device through AMD’s ExpressFlash™ Service.

Contact 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

Note: All sector groups are 256 Kbytes in size.

Sector Group

A22–A18

SA0–SA3

00000

SA4–SA7

00001

SA8–SA11

00010

SA12–SA15

00011

SA16–SA19

00100

SA20–SA23

00101

SA24–SA27

00110

SA28–SA31

00111

SA32–SA35

01000

SA36–SA39

01001

SA40–SA43

01010

SA44–SA47

01011

SA48–SA51

01100

SA52–SA55

01101

SA56–SA59

01110

SA60–SA63

01111

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