AM29F100 datasheet(10/36 Pages) AMD

10 / 36 page

Am29F100

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and erase operations in any sector. The

hardware sector unprotection feature re-enables

both program and erase operations in previously pro-

tected sectors.

Sector protection/unprotection must be implemented

using programming equipment. The procedure re-

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

control pins. Details on this method are provided in a

supplement, publication number 20373. Contact an

AMD representative to obtain a copy of the appropriate

document.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors 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 is protected

or unprotected. See “Autoselect Mode” for details.

Temporary Sector Unprotect

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system.

The Sector Unprotect mode is activated by setting the

RESET# pin to VID. During this mode, formerly pro-

tected sectors can be programmed or erased by se-

lecting the sector addresses. Once VID is removed

from the RESET# pin, all the previously protected

sectors are protected again. Figure 1 shows the algo-

rithm, and the Temporary Sector Unprotect (Figure

17) diagram shows the timing waveforms, for this fea-

ture.

Figure 1.

Temporary Sector Unprotect Operation

START

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect

Completed (Note 2)

RESET# = VID

(Note 1)

Notes:

1. All protected sectors unprotected.

2. All previously protected sectors are protected once

again.

18926C-6

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