參數(shù)資料
型號(hào)： AM29LV640MU120WHI
廠商： ADVANCED MICRO DEVICES INC
元件分類： PROM
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： 4M X 16 FLASH 3V PROM, 120 ns, PBGA63
封裝： 12 X 11 MM, 0.80 MM PITCH, FBGA-63
文件頁(yè)數(shù)： 19/59頁(yè)
文件大?。?/td> 699K
代理商： AM29LV640MU120WHI
February1,2007 25301C5
Am29LV640MU
17
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 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 previously
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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