S29AL016D SPANSION, S29AL016D Datasheet - Page 15

• Manufacturer Part Number: S29AL016D
• Description: 16 MEGABIT CMOS 3.0 VOLT ONLY BOOT SECTOR FLASH MEMORY
• Manufacturer: SPANSION

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DataSheet
4
L = Logic Low = V
Note:
Sector Protection/Unprotection
Temporary Sector Unprotect
December 17, 2004 S29AL016D_00_A2
Manufacturer ID: Spansion
Device ID:
S29AL016D
(Top Boot Block)
Device ID:
S29AL016D
(Bottom Boot Block)
Sector Protection Verification
U
.com
Description
The autoselect codes may also be accessed in-system via command sequences. See
To access the autoselect codes in-system, the host system can issue the autose-
lect command via the command register, as shown in
not require V
mode.
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 a Spansion representative
for details.
It is possible to determine whether a sector is protected or unprotected. See
toselect Mode
Sector protection/unprotection can be implemented via two methods.
The primary method requires V
mented either in-system or via programming equipment.
algorithms and
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
address pin A9 and OE#. This method is compatible with programmer routines
written for earlier 3.0 volt-only Spansion flash devices. Details on this method are
provided in a supplement, publication number 21468. Contact a Spansion repre-
sentative to request a copy.
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
grammed or erased by selecting the sector addresses. Once V
the RESET# pin, all the previously protected sectors are protected again. shows
the algorithm, and
IL
, H = Logic High = V
Mode
Word
Word
Byte
Byte
Table 4. S29AL016D Autoselect Codes (High Voltage Method)
CE#
ID
L
L
L
L
L
L
for details.
. See
Figure 23
ID
OE#
. During this mode, formerly protected sectors can be pro-
Figure 22
P r e l i m i n a r y
L
L
L
L
L
L
Command Definitions
IH
WE#
, SA = Sector Address, X = Don’t care.
H
H
H
H
H
H
shows the timing diagram. This method uses standard
shows the timing diagrams, for this feature.
A19
A12
DataSheet4U.com
SA
to
X
X
X
ID
S29AL016D
on the RESET# pin only, and can be imple-
A11
A10
to
X
X
X
X
V
V
V
V
A9
ID
ID
ID
ID
for details on using the autoselect
A8
A7
to
X
X
X
X
A6
L
L
L
L
Table
A5
A4
to
X
X
X
X
DataSheet4U.com
A3
A2
to
L
L
L
L
9. This method does
Figure 2
ID
A1
H
is removed from
L
L
L
A0
H
H
L
L
shows the
Table
DQ15
DQ8
22h
22h
to
X
X
X
X
X
ID
Au-
9.
on
00h (unprotected)
01h (protected)
DQ7
DQ0
01h
C4h
C4h
49h
49h
to
15