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AM29LV033MU датащи(PDF) 17 Page - Advanced Micro Devices

номер детали AM29LV033MU
подробное описание детали  32 Megabit (4 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
PDF  56 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29LV033MU датащи(HTML) 17 Page - Advanced Micro Devices

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November 11, 2002
Am29LV033MU
17
ADV ANCE
I N FO RMAT 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 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 previ-
ously protected sector groups are protected again.
Figure 1 shows the algorithm, and Figure 23 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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