AM29F100B-90EI データシートの表示（PDF） - Advanced Micro Devices

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AM29F100B-90EI

1 Megabit (128 K x 8-bit/64 K x 16-bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory

Advanced Micro Devices 

Table 4. Am29F100 Autoselect Codes (High Voltage Method)

Description

A15 A11

A8

A5

DQ8

to to

to

to

to

Mode CE# OE# WE# A12 A10 A9 A7 A6 A2 A1 A0 DQ15

Manufacturer ID: AMD

L

L

H X X VID X L X L L

X

Device ID:

Am29F100

(Top Boot Block)

Word L

L

H

22h

X X VID X L X L H

Byte L

L

H

X

DQ7

to

DQ0

01h

D9h

D9h

Device ID:

Word L

L

H

22h

DFh

Am29F100

X X VID X L X L H

(Bottom Boot Block) Byte L

L

H

X

DFh

X

01h

(protected)

Sector Protection Verification L

L

H SA X VID X L X H L

X

00h

(unprotected)

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 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 RE-

SET# pin to VID. During this mode, formerly protected

sectors can be programmed or erased by selecting the

sector addresses. Once VID is removed from the RE-

SET# pin, all the previously protected sectors are

protected again. Figure 1 shows the algorithm, and the

Temporary Sector Unprotect (Figure 15) diagram

shows the timing waveforms, for this feature.

START

RESET# = VID

(Note 1)

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect

Completed (Note 2)

18926D-6

Notes:

1. All protected sectors unprotected.

2. All previously protected sectors are protected once

again.

Figure 1. Temporary Sector Unprotect Operation

Am29F100

10

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