參數(shù)資料
型號(hào)： AM42DL640AG71IT
廠商： SPANSION LLC
元件分類(lèi)： 存儲(chǔ)器
英文描述： Stacked Multi-Chip Package (MCP) Flash Memory and SRAM 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only
中文描述： SPECIALTY MEMORY CIRCUIT, PBGA73
封裝： 8 X 11.60 MM, FBGA-73
文件頁(yè)數(shù)： 20/62頁(yè)
文件大?。?/td> 458K
代理商： AM42DL640AG71IT
October 22, 2002
Am42DL640AG
19
P R E L I M I N A R Y
method described in “Sector/Sector Block Protection
and Unprotection”.
If the system asserts V
IH
on the WP#/ACC pin, the de-
vice reverts to whether sectors 0, 1, 140, and 141
were last set to be protected or unprotected. That is,
sector protection or unprotection for these sectors de-
pends on whether they were last protected or unpro-
tected using the method described in “Sector/Sector
Block Protection and Unprotection”.
Note that the WP#/ACC pin must not be left floating or
unconnected; inconsistent behavior of the device may
result.
Table 7.
WP#/ACC Modes
Temporary Sector Unprotect
(Note: For the following discussion, the term “sector”
applies to both sectors and sector blocks. A sector
block consists of two or more adjacent sectors that are
protected or unprotected at the same time (see Table
6).
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to
V
ID
. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once V
ID
is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 1 shows the algorithm, and
Figure 26 shows the timing diagrams, for this feature.
If the WP#/ACC pin is at V
IL
, sectors 0, 1, 140, and
141 will remain protected during the Temporary sector
Unprotect mode.
Figure 1.
Temporary Sector Unprotect Operation
WP# Input
Voltage
Device
Mode
V
IL
Disables programming and erasing in
SA0, SA1, SA140, and SA141
Enables programming and erasing in
SA0, SA1, SA140, and SA141
Enables accelerated progamming (ACC).
See “Accelerated Program Operation” on
page 12.
V
IH
V
HH
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected (If WP#/ACC = V
IL
,
sectors 0, 1, 140, and 141 will remain protected).
2. All previously protected sectors are protected once
again.
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