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參數(shù)資料
| 型號： | AM29LV641MH110FI |
| 廠商： | Advanced Micro Devices, Inc. |
| 元件分類： | FLASH |
| 英文描述： | 64 Megabit (4 M x 16-Bit) MirrorBita?? 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/Oa?? Control |
| 中文描述： | 64Mb(4個M x 16位)的MirrorBit，3V，統(tǒng)一扇區(qū)閃存并有Versatile輸入/輸出控制 |
| 文件頁數(shù)： | 18/60頁 |
| 文件大?。?/td> | 640K |
| 代理商： | AM29LV641MH110FI |
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16
Am29LV641MH/L
December 21, 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
.
If the system asserts V
IL
on the WP# pin, the device
disables program and erase functions in the first or last
sector independently of whether those sectors were
protected or unprotected using the method described
in “Sector Group Protection and Unprotection”. Note
that if WP# 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# pin, the device
reverts to whether the first or last sector was previ-
ously set to be protected or unprotected using the
method described in “Sector Group Protection and
Unprotection”.
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 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.
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