S29AL004D Просмотр технического описания (PDF) - Spansion Inc.
Номер в каталоге
Компоненты Описание
производитель
S29AL004D
Spansion Inc.
S29AL004D Datasheet PDF : 55 Pages
| |||
Advance Information
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 VID. See Command Definitions‚ on page 18 for details
on using the autoselect mode.
Table 4. S29AL004D Autoselect Codes (High Voltage Method)
A17 A11
A8
A4 A3
DQ8
Description Mode CE# OE# WE# to to A9 to A6 to to A1 A0
to
A12 A10
A7
A5 A2
DQ15
DQ7
to
DQ0
Manufacturer ID:
Spansion
L
L
H
X
X
VID
X
L
X
L
L
L
X
01h
Device ID:
Word L
L
H
22h
B9h
S29AL004D
X
X
VID
X
L
X
L
L
H
(Top Boot Block) Byte
L
L
H
X
B9h
Device ID:
Word L
L
H
22h
S29AL004D
(Bottom Boot
Block)
Byte
L
X
X
VID
X
L
X
L
L
H
L
H
X
BAh
BAh
Sector Protection
Verification
L
L
H
SA
X
VID
X
L
X
L
H
L
X
01h
(protected)
X
00h
(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 14 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 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 VID 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 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.
February 18, 2005 S29AL004D_00_A1
S29AL004D
15
Share Link: