D a t a S h e e t
Table 4. S29AL008D Autoselect Codes (High Voltage Method)
A18 A11
to to
Mode CE# OE# WE# A12 A10 A9
A8
to
A7
A5
to
A2
DQ8
to
A0 DQ15
DQ7
to
DQ0
Description
A6
A1
Manufacturer ID
:
Spansion
Word
L
L
L
L
H
H
X
X
VID
X
L
X
L
L
X
01h
DAh
Device ID:
22h
Am29LV800B
(Top Boot Block)
X
X
VID
X
L
L
X
L
L
H
Byte
L
L
L
L
H
H
X
DAh
5Bh
Device ID:
Am29LV800B
(Bottom Boot
Block)
Word
22h
X
X
X
VID
X
X
X
X
H
L
Byte
L
L
H
X
X
5Bh
01h
(protected)
Sector Protection
Verification
L
L
H
SA
VID
L
H
00h
(unprotected
)
X
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 V on the RESET# pin only, and can be imple-
ID
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 V on
ID
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 V . During this mode, formerly protected sectors can be pro-
ID
grammed or erased by selecting the sector addresses. Once V is removed from
ID
the RESET# pin, all the previously protected sectors are protected again.
16
S29AL008D
S29AL008D_00A3 June 16, 2005
SPANSION [ SPANSION ]
