AM29LV320MH SPANSION [SPANSION], AM29LV320MH Datasheet - Page 19

• Manufacturer Part Number: AM29LV320MH
• Description: 32 Megabit (2 M x 16-Bit/4 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
• Manufacturer: SPANSION [SPANSION]

Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the first or last sector without
using V
vided by the WP#/ACC input.
If the system asserts V
vice disables program and erase functions in the first
or last sector independently of whether those sectors
were protected or unprotected using the method de-
scribed in “Sector Group Protection and Unprotection”.
Note that if WP#/ACC is at V
the standby mode, the maximum input load current is
increased. See the table in “DC Characteristics”.
If the system asserts V
vice reverts to whether the first or last sector was pre-
viously set to be protected or unprotected using the
method described in “Sector Group Protection and
Unprotection”. Note: No external pullup is necessary
since the WP#/ACC pin has internal pullup to V
Temporary Sector Group Unprotect
(Note: In this device, a sector group consists of four adjacent
sectors that are protected or unprotected at the same time
(see Table 4).
This feature allows temporary unprotection of previ-
ously protected sector groups to change data in-sys-
tem. The Sector Group Unprotect mode is activated by
setting the RESET# pin to
merly protected sector groups can be programmed or
erased by selecting the sector group addresses. Once
V
protected sector groups are protected again. Figure 1
December 14, 2005
ID
is removed from the RESET# pin, all the previously
ID
. Write Protect is one of two functions pro-
IL
IH
on the WP#/ACC pin, the de-
on the WP#/ACC pin, the de-
V
ID
IL
. During this mode, for-
when the device is in
D A T A S H E E T
CC
Am29LV320MH/L
.
shows the algorithm, and Figure 23 shows the timing
diagrams, for this feature.
Notes:
1. All protected sector groups unprotected (If WP# = V
2. All previously protected sector groups are protected
the first or last sector will remain protected).
once again.
Figure 1. Temporary Sector Group
Unprotect Operation
Program Operations
Completed (Note 2)
Temporary Sector
Perform Erase or
Group Unprotect
RESET# = V
RESET# = V
(Note 1)
START
ID
IH
IL
17
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