參數(shù)資料
型號(hào)： AM29LV642DU120PAE
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(mén)與VersatileI /輸出⑩控制
文件頁(yè)數(shù)： 23/54頁(yè)
文件大?。?/td> 520K
代理商： AM29LV642DU120PAE
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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