參數(shù)資料
型號(hào)： AM49LV128BMAH15NT
廠商： SPANSION LLC
元件分類(lèi)： 存儲(chǔ)器
英文描述： 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
中文描述： SPECIALTY MEMORY CIRCUIT, PBGA64
封裝： 12 X 9 MM, FBGA-64
文件頁(yè)數(shù)： 22/98頁(yè)
文件大?。?/td> 1016K
代理商： AM49LV128BMAH15NT
20
Am49LV128BM
June 17, 2004
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the last sector without using V
ID
.
Write Protect is one of two functions provided by the
WP#/ACC input.
If the system asserts V
IL
on the WP#/ACC pin, the de-
vice disables program and erase functions in the last
sector independently of whether those sectors were
protected or unprotected using the method described
in “Sector Group Protection and Unprotection”. Note
that if WP#/ACC is at V
IL
when the device is in the
standby mode, the maximum input load current is in-
creased. See the table in “DC Characteristics”.
If the system asserts V
IH
on the WP#/ACC pin, the de-
vice reverts to whether the last sector was previously
set to be protected or unprotected using the method
described in “Sector Group Protection and Unprotec-
tion”.
Note that WP# has an internal pullup; when un-
connected, WP# is at V
IH
.
Temporary Sector Group Unprotect
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 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 (If WP# = V
IL
,
the last sector group will remain protected).
2. All previously protected sector groups are protected
once again.
相關(guān)PDF資料
PDF描述
AM49LV128BMAL11NS 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAL11NT 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAL15NS 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAL15NT 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMH11NS 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM49LV128BMAL11NS 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAL11NT 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAL15NS 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAL15NT 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMH11NS 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
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