S29AL008D55BAI023 데이터 시트보기 (PDF) - Spansion Inc.

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S29AL008D55BAI023

8 Megabit (1 M x 8-Bit/512 K x 16-Bit)CMOS 3.0 Volt-only Boot Sector Flash Memory

Spansion Inc. 

Data Sheet

Table 4. S29AL008D 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: Spansion L

L

H

X

X VID X

L

X

L

L

X

01h

Device ID:

Word L

L

H

22h

DAh

Am29LV800B

X X VID X L X L H

(Top Boot Block)

Byte L

L

H

X

DAh

Device ID:

Am29LV800B

(Bottom Boot

Block)

Word L

L

H

22h

5Bh

X X VID X L X L H

Byte L

L

H

X

5Bh

Sector Protection

Verification

X

01h

(protected)

L

L

H SA X VID X L X H L

00h

X (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 opera-

tions in any sector. The hardware sector unprotection feature re-enables both

program and erase operations in previously protected sectors.

The device is shipped with all sectors unprotected. Spansion offers the option of

programming and protecting sectors at its factory prior to shipping the device

through Spansion’s ExpressFlash™ Service. Contact an Spansion representative

for details.

It is possible to determine whether a sector is protected or unprotected. See

Autoselect Mode, on page 15 for details.

Sector Protection/unprotection can be implemented via two methods.

The primary method requires VID on the RESET# pin only, and can be imple-

mented either in-system or via programming equipment. Figure 2, on page 18

shows the algorithms and Figure 23, on page 47 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 Spansion flash devices. Publication number 20536

contains further details; contact an Spansion representative to request a copy.

Temporary Sector Unprotect

This feature allows temporary unprotection of previously protected sectors to

change data in-system. The Sector Unprotect mode is activated by setting the

RESET# pin to VID. During this mode, formerly protected sectors can be pro-

grammed or erased by selecting the sector addresses. Once VID is removed from

the RESET# pin, all the previously protected sectors are protected again.

16

S29AL008D

S29AL008D_00A3 June 16, 2005

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