s29al008j Meet Spansion Inc., s29al008j Datasheet - Page 18

• Manufacturer Part Number: s29al008j
• 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
Note
The autoselect codes may also be accessed in-system via command sequences. See
7.10
18
Manufacturer ID: Spansion
Device ID: S29AL008J
(Top Boot Block)
Device ID: S29AL008J
(Bottom Boot Block)
Sector Protection Verification
Secured Silicon Sector Indicator Bit (DQ7) Top
Boot Block
Secured Silicon Sector Indicator Bit (DQ7)
Bottom Boot Block
Description
Autoselect Mode
Sector Protection/Unprotection
IL;
H = Logic High = V
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 and A3–A0 must be as shown in
sector address must appear on the appropriate highest order address bits (see
Table 7.4 on page
bits have been 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 26
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 a
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.
Details on this method are provided in a supplement, publication number 21468. Contact a Spansion
representative to request a copy.
Word
Byte
Word
Byte
IH;
Table 7.6 S29AL008J Autoselect Codes (High Voltage Method)
Mode
SA = Sector Address; X = Don’t care
17).
CE#
L
L
L
L
L
L
L
L
for details on using the autoselect mode.
Table 7.6
D a t a
Figure 7.2 on page 20
OE#
L
L
L
L
L
L
L
L
ID
Table 10.1 on page
WE#
shows the remaining address bits that are don’t care. When all necessary
S h e e t
on the RESET# pin only, and can be implemented either in-system or via
H
H
H
H
H
H
H
H
A18
A10
S29AL008J
SA
to
X
X
X
X
X
V
V
V
V
V
V
A9
( A d v a n c e
ID
ID
ID
ID
ID
ID
shows the algorithms and
Table 10.1 on page
Table
A8
A7
to
X
X
X
X
X
X
31. This method does not require V
A6
L
L
L
L
L
L
7.6. In addition, when verifying sector protection, the
A5
A4
to
X
X
X
X
X
X
I n f o r m a t i o n )
A3
A2
to
31.
L
L
L
L
L
L
A1
H
H
H
L
L
L
ID
(8.5 V to 12.5 V) on address pin A9.
A0
H
H
H
H
L
L
Figure 17.12 on page 47
ID
Autoselect Mode on page 18
on address pin A9 and OE#.
S29AL008J_00_04 May 23, 2008
DQ15
DQ8
22h
22h
Table 7.2 on page 16
to
X
X
X
X
X
X
X
0Eh (not factory locked)
16h (not factory locked)
ID
8Eh (factory locked)
96h (factory locked)
. See
00h (unprotected)
01h (protected)
DQ7
DQ0
DAh
DAh
5Bh
5Bh
01h
Command
to
shows
and
for