AM29LV002T-150ECB Просмотр технического описания (PDF) - Advanced Micro Devices

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AM29LV002T-150ECB

2 Megabit (256 K x 8-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory

Advanced Micro Devices 

PRELIMINARY

Table 4. Am29LV002 Autoselect Codes (High Voltage Method)

Description

A17 A12

A8

A5

to to

to

to

CE# OE# WE# A13 A10 A9 A7 A6 A2 A1 A0

DQ7

to

DQ0

Manufacturer ID: AMD

L

L

H

X

X VID X

L

X

L

L

01h

Device ID: Am29LV002T

(Top Boot Block)

L

L

H

X

X VID X

L

X

L

H

40h

Device ID: Am29LV002B

(Bottom Boot Block)

L

L

H

X

X VID X

L

X

L

H

C2h

01h

(protected)

Sector Protection Verification L

L

H SA X VID X

L

X

H

L

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 pro-

gram 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

OE#. Details on this method are provided in a supple-

ment, publication number 21224. Contact an AMD rep-

resentative to request a copy.

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

Figure 19 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)

Notes:

21191C-4

1. All protected sectors unprotected.

2. All previously protected sectors are protected once

again.

Figure 1. Temporary Sector Unprotect Operation

10

Am29LV002

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