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| 型號： | AM29LV256MH100EF |
| 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 /價外控制 |
| 文件頁數(shù)： | 28/69頁 |
| 文件大小： | 546K |
| 代理商： | AM29LV256MH100EF |
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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
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 |
|---|---|
| AM29LV256MH100EI | 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 |
| AM29LV256MH100FF | 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 |
| AM29LV256MH100FI | 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 |
| AM29LV256MH100PGF | 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 |
| AM29LV256MH100PGI | 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 |
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