AM29LV2562M AMD [Advanced Micro Devices], AM29LV2562M Datasheet - Page 29

• Manufacturer Part Number: AM29LV2562M
• Manufacturer: AMD [Advanced Micro Devices]

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 that WP# has an internal pullup;
when unconnected, WP# is at V
Temporary Sector Group Unprotect
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
shows the algorithm, and Figure 22 shows the timing
diagrams, for this feature.
December 16, 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-
IH
when the device is in
.
D A T A S H E E T
Am29LV2562M
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
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
START
ID
IH
IL
,
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