AM29DL800BB120EC 데이터 시트보기 (PDF) - Advanced Micro Devices

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AM29DL800BB120EC

8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory

Advanced Micro Devices 

DATA SHEET

Table 4. Am29DL800B Autoselect Codes (High Voltage Method)

Description

A18 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 BA X VID X L X L L

X

01h

Device ID:

Word L

L

H

22h

4Ah

Am29DL800B

BA X VID X L X L H

(Top Boot Block)

Byte L

L

H

X

4Ah

Device ID:

Word L

L

H

22h

CBh

Am29DL800B

BA X VID X L X L H

(Bottom Boot Block) Byte L

L

H

X

CBh

Sector Protection Verification L

L

H SA X VID X L X H L

X

01h

(protected)

X

00h

(unprotected)

Note: L = Logic Low = VIL, H = Logic High = VIH, BA = Bank Address, 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 2 shows the algo-

rithms and Figure 24 shows the timing diagram. This

method uses standard microprocessor bus cycle tim-

ing. 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 21467 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 the Autoselect Mode section 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 (11.5 V – 12.5 V). During this mode,

formerly protected sectors can be programmed or

erased by selecting the sector addresses. Once VID is

removed from the RESET# pin, all the previously pro-

tected sectors are protected again. Figure 1 shows the

algorithm, and Figure 23 shows the timing diagrams,

for this feature.

START

RESET# = VID

(Note 1)

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

Notes:

1. All protected sectors unprotected.

2. All previously protected sectors are protected once

again.

Figure 1. Temporary Sector Unprotect Operation

14

Am29DL800B

21519C4 December 4, 2006

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