AM29F080B datasheet(13/39 Pages) AMD

13 / 39 page

November 1, 2006 21503G5

Am29F080B

D A TA SH EE T

Sector Group Protection/Unprotection

The hardware group sector protection feature dis-

ables both program and erase operations in any sec-

tor group. Each sector group consists of two adjacent

sectors. Table 3 shows how the sectors are grouped,

and the address range that each sector group con-

tains. The hardware sector group unprotection fea-

ture re-enables both program and erase operations in

previously protected sector groups.

Sector group protection/unprotection must be imple-

mented using programming equipment. The procedure

requires a high voltage (VID) on address pin A9 and the

control pins. Details on this method are provided in a

supplement, listed in publication number 19945. Con-

tact an AMD representative to obtain a copy of the ap-

propriate document.

The device is shipped with all sectors unprotected.

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 “Autoselect Mode” for

details.

Table 3.

Sector Group Addresses

Temporary Sector Group Unprotect

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,

formerly protected sector groups can be programmed

or erased by selecting the sector group addresses.

Once VID is removed from the RESET# pin, all the

pre v iou s ly

protected

sect o r

g r oups

are

protected again. Figure 1 shows the algorithm, and

the Temporar y Sector Group Unprotect diagram

shows the timing waveforms, for this feature.

Figure 1.

Temporary Sector Group Unprotect

Operation

Sector

Group

A19

A18

A17

Sectors

SGA0

SA0

–SA1

SGA1

SA2

–SA3

SGA2

SA4

–SA5

SGA3

SA6

–SA7

SGA4

SA8

–SA9

SGA5

SA10

–SA11

SGA6

SA12

–SA13

SGA7

SA14

–SA15

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.

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