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參數(shù)資料
| 型號： | L642DU12RI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control |
| 中文描述： | 128兆位（8米× 16位）的CMOS 3.0伏特，只有統(tǒng)一閃存部門與VersatileI /輸出⑩控制 |
| 文件頁數(shù)： | 23/54頁 |
| 文件大?。?/td> | 520K |
| 代理商： | L642DU12RI |
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May 5, 2006 25022A2
Am29LV642D
21
D A T A S H E E T
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 5)).
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
(8.5 V – 12.5 V). During
this mode, formerly 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 21 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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