參數(shù)資料
型號(hào)： AM29LV128ML93FI
廠商： Advanced Micro Devices, Inc.
英文描述： 128 Megabit (8 M x 16-Bit/16 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
中文描述： 128兆位（8 M中的x 16-Bit/16 M中的x 8位）的MirrorBit⑩3.0伏特，只有統(tǒng)一部門(mén)閃存與VersatileI內(nèi)存/ O控制
文件頁(yè)數(shù)： 22/65頁(yè)
文件大?。?/td> 1222K
代理商： AM29LV128ML93FI
20
Am29LV128MH/L
September 9, 2003
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 group with-
out 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 group independently of whether those
sector groups were protected or unprotected using the
method described 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 Char-
acteristics”.
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 VID. 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 24 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.
相關(guān)PDF資料
PDF描述
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