s29al008d Meet Spansion Inc., s29al008d Datasheet - Page 18

• Manufacturer Part Number: s29al008d
• Description: 8 Megabit 1 M X 8-bit/512 K X 16-bit Cmos 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

7.9
Legend
L = Logic Low = V
H = Logic High = V
SA = Sector Address
X = Don’t care.
7.10
18
Manufacturer ID: Spansion
Device ID:
S29AL008D
(Top Boot Block)
Device ID:
S29AL008D
(Bottom Boot Block)
Sector Protection Verification
Description
Autoselect Mode
Sector Protection/Unprotection
IL
IH
The autoselect mode provides manufacturer and device identification, and sector protection verification,
through identifier codes output on DQ7–DQ0. This mode is primarily intended for programming equipment to
automatically match a device to be programmed with its corresponding programming algorithm. However, the
autoselect codes can also be accessed in-system through the command register.
When using programming equipment, the autoselect mode requires V
Address pins A6, A1, and A0 must be as shown in
sector address must appear on the appropriate highest order address bits (see
Table 7.3 on page
bits are set as required, the programming equipment may then read the corresponding identifier code on
DQ7–DQ0.
To access the autoselect codes in-system, the host system can issue the autoselect command via the
command register, as shown in
Definitions on page 21
The hardware sector protection feature disables both program and erase operations 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
details.
Sector Protection/unprotection can be implemented via two methods.
The primary method requires V
programming equipment.
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
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.
Word
Byte
Word
Byte
Mode
CE#
Table 7.4 S29AL008D Autoselect Codes (High Voltage Method)
L
L
L
L
L
L
17).
OE#
L
L
L
L
L
L
for details on using the autoselect mode.
Table 7.4
Figure 7.2 on page 20
WE#
H
H
H
H
H
H
ID
Table 8.1 on page
A18
A12
SA
shows the remaining address bits that are don’t care. When all necessary
to
on the RESET# pin only, and can be implemented either in-system or via
X
X
X
A11
A10
S29AL008D
to
X
X
X
X
D a t a
V
V
V
V
A9
ID
ID
ID
ID
shows the algorithms and
Table
26. This method does not require V
A8
A7
to
X
X
X
X
S h e e t
7.4. In addition, when verifying sector protection, the
A6
L
L
L
L
A5
A4
to
X
X
X
X
ID
A3
A2
S29AL008D_00_A10 November 27, 2007
to
L
L
L
L
(11.5 V to 12.5 V) on address pin A9.
Figure 15.12 on page 43
ID
A1
H
L
L
L
Autoselect Mode on page 18
on address pin A9 and OE#.
Table 7.2 on page 16
A0
H
H
L
L
ID
DQ15
. See
DQ8
22h
22h
to
X
X
X
X
X
Command
01h (protected)
(unprotected)
DQ7
DQ0
DAh
DAh
01h
5Bh
5Bh
00h
shows
to
and
for