Table 3. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (see Table 2). Table 3 shows
the remaining address bits that are don’t care. When all
necessary bits have been set as required, the program-
ming equipment may then read the corresponding
identifier code on DQ7-DQ0.
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice 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 8. This method
When using programming equipment, the autoselect
does not require V . See “” for details on using the au-
ID
mode requires V (11.5 V to 12.5 V) on address pin
ID
toselect mode.
A9. Address pins A6, A1, and A0 must be as shown in
Table 3. Am29LV017D Autoselect Codes (High Voltage Method)
A20 A15
to to
OE# WE# A16 A10
A8
to
A7
A5
to
A2
DQ7
to
DQ0
Description
Manufacturer ID: AMD
Device ID: Am29LV017D
CE#
L
A9
A6
L
A1
L
A0
L
L
L
H
H
X
X
X
X
V
V
X
X
X
X
01h
C8h
ID
ID
L
L
L
H
01h
(protected)
Sector Protection Verification
L
L
H
SA
X
V
X
L
X
H
L
ID
00h
(unprotected)
L = Logic Low = V , H = Logic High = V , SA = Sector Address, X = Don’t care.
IL
IH
lication number 21587 contains further details; contact
an AMD representative to request a copy.
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 pro-
gram and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
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
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
The primary method requires V on the RESET# pin
It is possible to determine whether a sector is protected
or unprotected. See “Autoselect Mode” for details.
ID
only, and can be implemented either in-system or via
programming equipment. Figure 1 shows the algo-
rithms and Figure 21 shows the timing diagram. This
method uses standard microprocessor bus cycle tim-
ing. For sector unprotect, all unprotected sectors must
first be protected prior to the first sector unprotect write
cycle.
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 RE-
SET# pin to V . During this mode, formerly protected
ID
sectors can be programmed or erased by selecting the
The alternate method intended only for programming
sector addresses. Once V is removed from the RE-
equipment requires V on address pin A9 and OE#.
ID
ID
SET# pin, all the previously protected sectors are
protected again. Figure 2 shows the algorithm, and
Figure 20 shows the timing diagrams, for this feature.
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices. Pub-
16
Am29LV017D
AMD [ AMD ]
