AM29SL800DB120WAC AMD [Advanced Micro Devices], AM29SL800DB120WAC Datasheet - Page 14

• Manufacturer Part Number: AM29SL800DB120WAC
• Description: 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

Autoselect Mode
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 VID on address pin A9. Address pins
A6, A1, and A0 must be as shown in Table 4. In addi-
tion, when verifying sector protection, the sector
L = Logic Low = V
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both
program and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
Sector Protection/ Unprotection requires V
RESET# pin only, and can be implemented either in-
system or via programming equipment.
page 13
36
unprotected sectors must first be protected prior to the
first sector unprotect write cycle.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
12
(Bottom Boot Block)
Sector Protection Verification
(Top Boot Block)
shows the timing diagram. For sector unprotect, all
Am29SL800D
Am29SL800D
Description
Manufacturer ID: AMD
Device ID:
Device ID:
shows the algorithms and
IL
, H = Logic High = V
Mode
Word
Word
Byte
Byte
Table 4. Am29SL800D Autoselect Code (High Voltage Method)
CE#
L
L
L
L
L
L
IH
, SA = Sector Address, X = Don’t care.
Figure 23, on page
OE#
L
L
L
L
L
L
Figure 1, on
WE#
H
H
H
H
H
H
D A T A
ID
on the
A18
A12
SA
to
X
X
X
Am29SL800D
A11
A10
to
X
X
X
X
S H E E T
address must appear on the appropriate highest order
address bits (see
page
that are don’t care. When all necessary 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
This method does not require VID. See
Definitions‚ on page 14
lect mode.
V
V
V
V
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is protected
or unprotected. See
details.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the
RESET# pin to V
tected sectors can be programmed or erased by
selecting the sector addresses. Once V
from the RESET# pin, all the previously protected
sectors are protected again.
shows the algorithm, and
the timing diagrams, for this feature.
A9
ID
ID
ID
ID
11).
A8
A7
to
X
X
X
X
Table 4
A6
L
L
L
L
A5
A2
to
X
X
X
X
ID
Table 2 on page 10
shows the remaining address bits
. During this mode, formerly pro-
Autoselect Mode‚ on page 12
A1
H
for details on using the autose-
L
L
L
Figure 22, on page 35
A0
H
H
L
L
Figure 2, on page 14
27546A6 January 23, 2007
Table 5 on page
DQ15
DQ8
22h
22h
to
X
X
X
X
X
and
ID
01h (protected)
(unprotected)
is removed
Command
Table 3 on
DQ7
DQ0
EAh
EAh
6Bh
6Bh
01h
00h
to
shows
19.
for