參數(shù)資料
型號: AM29LV640MU101RPCI
廠商: ADVANCED MICRO DEVICES INC
元件分類: PROM
英文描述: 64 Megabit (4 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with
中文描述: 4M X 16 FLASH 3V PROM, 100 ns, PBGA64
封裝: 13 X 11 MM, 1 MM PITCH, BGA-64
文件頁數(shù): 18/58頁
文件大?。?/td> 1170K
代理商: AM29LV640MU101RPCI
June 12, 2003
Am29LV640MU
17
A D V A N C E I N F O R M A T 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
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 previ-
ously 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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