參數(shù)資料
型號(hào)： L320ML12PF
廠商： Advanced Micro Devices, Inc.
英文描述： 32 Megabit (2 M x 16-Bit/4 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control
中文描述： 32兆位（2米× 16位/ 4米× 8位）的MirrorBit⑩3.0伏特，只有統(tǒng)一閃存部門與VersatileI /輸出⑩控制
文件頁數(shù)： 19/59頁
文件大?。?/td> 657K
代理商： L320ML12PF
January31,2007 26517B4
Am29LV320MH/L
17
D A T A S H E E T
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the first or last sector without
using V
ID
. Write Protect is one of two functions pro-
vided by the WP#/ACC input.
If the system asserts V
IL
on the WP#/ACC pin, the de-
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
IL
when the device is in
the standby mode, the maximum input load current is
increased. See the table in
“DC Characteristics”
.
If the system asserts V
IH
on the WP#/ACC pin, the de-
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
CC
.
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
V
ID
. During this mode, for-
merly protected sector groups can be programmed or
erased by selecting the sector group addresses. Once
V
ID
is removed from the RESET# pin, all the previously
protected sector groups are protected again. Figure 1
shows the algorithm, and Figure 23 shows the timing
diagrams, for this feature.
Figure 1.
Temporary Sector Group
Unprotect Operation
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Group Unprotect
Completed (Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sector groups unprotected (If WP# = V
IL
,
the first or last sector will remain protected).
2. All previously protected sector groups are protected
once again.
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