AM29LV017D-90EC AMD (ADVANCED MICRO DEVICES), AM29LV017D-90EC Datasheet - Page 12

• Manufacturer Part Number: AM29LV017D-90EC
• Description: Flash Memory IC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM29LV017D-90EC

• Memory Configuration: 2M X 8
• Package/case: 32-PLCC
• Supply Voltage Max: 3.6V
• Access Time, Tacc: 90nS
• Mounting Type: Surface Mount
• Supply Voltage: 3V

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.
When using programming equipment, the autoselect
mode requires V
A9. Address pins A6, A1, and A0 must be as shown in
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 pro-
gram and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
The primary method requires V
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.
The alternate method intended only for programming
equipment requires V
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices. Pub-
Manufacturer ID: AMD
Device ID: Am29LV017D
Sector Protection Verification
Description
IL
ID
, H = Logic High = V
(11.5 V to 12.5 V) on address pin
ID
Table 3. Am29LV017D Autoselect Codes (High Voltage Method)
on address pin A9 and OE#.
CE#
L
L
L
ID
on the RESET# pin
IH
OE#
, SA = Sector Address, X = Don’t care.
L
L
L
WE#
H
H
H
Am29LV017D
A20
A16
SA
to
X
X
A15
A10
to
X
X
X
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.
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
does not require V
toselect mode.
lication number 21587 contains further details; contact
an AMD representative to request a copy.
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.
It is possible to determine whether a sector is protected
or unprotected. See “Autoselect Mode” 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 RE-
SET# pin to V
sectors can be programmed or erased by selecting the
sector addresses. Once V
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.
V
V
V
A9
ID
ID
ID
A8
A7
to
X
X
X
ID
. During this mode, formerly protected
A6
L
L
L
ID
. See “” for details on using the au-
A5
A2
to
X
X
X
ID
A1
is removed from the RE-
H
L
L
A0
H
L
L
(unprotected)
(protected)
DQ7
DQ0
C8h
01h
01h
00h
to
11