AM29LV200BT55RSE データシートの表示（PDF） - Advanced Micro Devices

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AM29LV200BT55RSE

2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

Advanced Micro Devices 

DATA SHEET

Table 4. Am29LV200B Autoselect Codes (High Voltage Method)

Description

A16 A11

A8

A5

DQ8

to to

to

to

to

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

DQ7

to

DQ0

Manufacturer ID: AMD

L

L

H X X VID X L X L L

X

01h

Device ID:

Word L

L

H

22h

3Bh

Am29LV200B

X X VID X L X L H

(Top Boot Block)

Byte L

LH

X

3Bh

Device ID:

Word L

L

H

22h

BFh

Am29LV200B

X X VID X L X L H

(Bottom Boot Block) Byte L

L

H

X

BFh

Sector Protection Verification L

L

H SA X VID X L X H L

X

01h

(protected)

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 can be imple-

mented via two methods.

The primary method requires VID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 1 shows the algo-

rithms and Figure 23 shows the timing diagram. This

method uses standard microprocessor bus cycle

timing. For sector unprotect, all unprotected sectors

must first be protected prior to the first sector unprotect

write cycle.

The alternate method intended only for programming

equipment requires VID on address pin A9 and OE#.

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices. Pub-

lication number 21226 contains further details; contact

an AMD representative 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

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 2 shows the algo-

rithm, and Figure 22 shows the timing diagrams, for this

feature.

12

Am29LV200B

21521D6 October 10, 2006

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