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參數(shù)資料
| 型號(hào)： | L256ML123RF |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 256 Megabit (16 M x 16-Bit/32 M x 8-Bit) MirrorBitTM 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/OTM Control |
| 中文描述： | 256兆位（16 M中的x 16-Bit/32 M中的x 8位）MirrorBitTM 3.0伏特，只有統(tǒng)一閃存部門與VersatileI /價(jià)外控制 |
| 文件頁數(shù)： | 28/69頁 |
| 文件大小： | 546K |
| 代理商： | L256ML123RF |
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26
Am29LV256M
December 16, 2005
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 that WP# has an internal pullup;
when unconnected, WP# is at V
IH
.
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
V
ID
. During this mode, for-
merly protected sector groups can be programmed or
erased by selecting the sector addresses. Once V
ID
is
removed from the RESET# pin, all the previously pro-
tected sector groups are protected again.
Figure 1
shows the algorithm, and
Figure 22
shows the timing
diagrams, for this feature.
Figure 1.
Group Unprotect Operation
Temporary Sector
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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