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| 型號： | AM29LV64MU101RWHI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 64 Megabit (4 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with |
| 中文描述： | 64兆位（4個M x 16位）的MirrorBit 3.0伏特，只有統(tǒng)一的閃存部門 |
| 文件頁數(shù)： | 18/58頁 |
| 文件大小： | 1173K |
| 代理商： | AM29LV64MU101RWHI |
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June 12, 2003
Am29LV640MU
17
A D V A N C E I N F O R M A T I O N
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
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 previ-
ously protected sector groups are protected again.
Figure 1 shows the algorithm, and Figure 22 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.
2. All previously protected sector groups are protected
once again.
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