參數(shù)資料
型號(hào)： S29AL004D
廠商： Spansion Inc.
英文描述： 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
中文描述： 4兆位（512 kX的8-Bit/256畝x 16位），3.0伏的CMOS只引導(dǎo)扇區(qū)閃存
文件頁(yè)數(shù)： 17/55頁(yè)
文件大?。?/td> 1481K
代理商： S29AL004D
February 18, 2005 S29AL004D_00_A1
S29AL004D
15
A d v a n c e I n f o r m a t i o n
To access the autoselect codes in-system, the host system can issue the autose-
lect command via the command register, as shown in
Table on page 24
. This
method does not require V
ID
. See
Command Definitions on page 18
for details
on using the autoselect mode.
L = Logic Low = V
IL
, H = Logic High = V
IH
, 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 14
for details.
Sector Protection/unprotection can be implemented via two methods.
The primary method requires V
ID
on the RESET# pin only, and can be imple-
mented either in-system or via programming equipment.
Figure 2, on page 17
shows the algorithms and
Figure 23, on page 46
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 V
ID
on
address pin A9 and OE#. This method is compatible with programmer routines
written for earlier 3.0 volt-only Spansion flash devices.
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 V
ID
. During this mode, formerly protected sectors can be pro-
grammed or erased by selecting the sector addresses. Once V
ID
is removed from
the RESET# pin, all the previously protected sectors are protected again.
Table 4. S29AL004D Autoselect Codes (High Voltage Method)
Description
Mode
CE#
OE#
WE#
A17
to
A12
A11
to
A10
A9
A8
to
A7
A6
A4
to
A5
A3
to
A2
A1
A0
DQ8
to
DQ15
DQ7
to
DQ0
Manufacturer ID
:
Spansion
L
L
H
X
X
V
ID
X
L
X
L
L
L
X
01h
Device ID:
S29AL004D
(Top Boot Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
L
H
22h
B9h
Byte
L
L
H
X
B9h
Device ID:
S29AL004D
(Bottom Boot
Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
L
H
22h
BAh
Byte
L
L
H
X
BAh
Sector Protection
Verification
L
L
H
SA
X
V
ID
X
L
X
L
H
L
X
01h
(protected)
X
00h
(unprotected)
相關(guān)PDF資料
PDF描述
S29AL004D90BAI012 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
S29AL004D90BAI013 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
S29AL004D90BAI020 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
S29AL004D90BAI022 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
S29AL004D90BAI023 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
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