AM29F200BT-45SC datasheet(13/41 Pages) AMD

13 / 41 page

November 1, 2006 21526D4

Am29F200B

D A TA

SH EE T

Table 4.

Am29F200B Autoselect Codes (High Voltage Method)

L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both

program and erase operations in previously protected

sectors.

Sector protection/unprotection must be implemented

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, publication number 20551. 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

selecting 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 diagram

(Figure 18) shows the timing waveforms, for this

feature.

Figure 1.

Temporary Sector Unprotect Operation

Hardware Data Protection

The command sequence requirement of unlock cycles

for programming or erasing provides data protection

against inadvertent writes (refer to the Command Defi-

nitions table). In addition, the following hardware data

protection measures prevent accidental erasure or pro-

Description

Mode

CE#

OE#

WE#

A16

A12

A11

A10

DQ8

DQ15

DQ7

DQ0

Manufacturer ID: AMD

VID

01h

Device ID:

Am29F200B

(Top Boot Block)

Word

VID

22h

51h

Byte

51h

Device ID:

Am29F200B

(Bottom Boot Block)

Word

VID

22h

57h

Byte

57h

Sector Protection Verification

VID

01h

(protected)

00h

(unprotected)

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.

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