D A T A S H E E T
address must appear on the appropriate highest order
Autoselect Mode
address bits (see Table 2 on page 10 and Table 3 on
page 11). Table 4 shows the remaining address bits
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.
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.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 5 on page 19.
This method does not require VID. See Command
Definitions‚ on page 14 for details on using the autose-
lect mode.
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
Table 4. Am29SL800D Autoselect Code (High Voltage Method)
A18 A11
to to
WE# A12 A10
A8
to
A7
A5
to
A2
DQ8
to
DQ15
DQ7
to
DQ0
Description
Mode
CE#
L
OE#
A9
A6
A1
A0
Manufacturer ID: AMD
L
L
H
H
X
X
VID
X
X
L
X
X
L
L
X
01h
Device ID:
Am29SL800D
(Top Boot Block)
Word
L
22h
EAh
X
X
VID
L
L
L
L
H
H
Byte
Word
Byte
L
L
L
L
L
L
H
H
H
X
22h
X
EAh
6Bh
Device ID:
Am29SL800D
(Bottom Boot Block)
X
X
X
VID
X
X
X
X
6Bh
X
01h (protected)
Sector Protection Verification
L
L
H
SA
VID
L
H
L
00h
(unprotected)
X
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
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.
It is possible to determine whether a sector is protected
or unprotected. See Autoselect Mode‚ on page 12 for
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
Sector Protection/ Unprotection requires V on the
ID
RESET# pin only, and can be implemented either in-
system or via programming equipment. Figure 1, on
page 13 shows the algorithms and Figure 23, on page
36 shows the timing diagram. For sector unprotect, all
unprotected sectors must first be protected prior to the
first sector unprotect write cycle.
RESET# pin to V . During this mode, formerly pro-
ID
tected sectors can be programmed or erased by
selecting the sector addresses. Once V is removed
ID
from the RESET# pin, all the previously protected
sectors are protected again. Figure 2, on page 14
shows the algorithm, and Figure 22, on page 35 shows
the timing diagrams, for this feature.
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
Am29SL800D
27546A6 January 23, 2007
AMD [ AMD ]
