參數(shù)資料
型號(hào): AM29LV642DU90RPAI
廠商: ADVANCED MICRO DEVICES INC
元件分類: PROM
英文描述: 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
中文描述: 8M X 16 FLASH 3V PROM, 90 ns, PBGA64
封裝: 13 X 11 MM, 1 MM PITCH, FBGA-64
文件頁數(shù): 22/53頁
文件大?。?/td> 986K
代理商: AM29LV642DU90RPAI
Am29LV642D
21
P R E L I M I N A R Y
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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