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AM49LV4608MT15IS 데이터시트(PDF) 21 Page - SPANSION

부품명 AM49LV4608MT15IS
상세설명  Stacked Multi-chip Package (MCP) 64 Mbit (4 M x 16 bit) Flash Memory and 8 Mbit (512K x 16-Bit) pseudo Static RAM
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November 5, 2003
Am49LV6408M
19
ADV ANCE
I N FO RMAT I O N
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the top two or bottom two sectors
without using V
ID. WP# is one of two functions pro-
vided 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 first
or last sector independently of whether those sectors
were protected or unprotected using the method de-
scribed 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
increased. See the table in “DC Characteristics”.
If the system asserts V
IH on the WP#/ACC pin, the de-
vice reverts to whether the top or bottom two sectors
were previously set to be protected or unprotected
using the method described in “Sector Group Protec-
tion and Unprotection”.
Note: No external pullup is
necessary since the WP#/ACC pin has internal pullup
to V
CC
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. 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 23 shows the timing
diagrams, for this feature.
Figure 1.
Temporary Sector Group
Unprotect Operation
SA55–SA58
01100XXXXX
256 (4x64) Kbytes
SA59–SA62
01101XXXXX
256 (4x64) Kbytes
SA63–SA66
01110XXXXX
256 (4x64) Kbytes
SA67–SA70
01111XXXXX
256 (4x64) Kbytes
SA71–SA74
10000XXXXX
256 (4x64) Kbytes
SA75–SA78
10001XXXXX
256 (4x64) Kbytes
SA79–SA82
10010XXXXX
256 (4x64) Kbytes
SA83–SA86
10011XXXXX
256 (4x64) Kbytes
SA87–SA90
10100XXXXX
256 (4x64) Kbytes
SA91–SA94
10101XXXXX
256 (4x64) Kbytes
SA95–SA98
10110XXXXX
256 (4x64) Kbytes
SA99–SA102
10111XXXXX
256 (4x64) Kbytes
SA103–SA106
11000XXXXX
256 (4x64) Kbytes
SA107–SA110
11001XXXXX
256 (4x64) Kbytes
SA111–SA114
11010XXXXX
256 (4x64) Kbytes
SA115–SA118
11011XXXXX
256 (4x64) Kbytes
SA119–SA122
11100XXXXX
256 (4x64) Kbytes
SA123–SA126
11101XXXXX
256 (4x64) Kbytes
SA127–SA130
11110XXXXX
256 (4x64) Kbytes
SA131–SA134
11111XXXXX
256 (4x64) Kbytes
Table 5.
Am29LV640MB Bottom Boot
Sector Protection (Continued)
Sector
A21–A12
Sector/
Sector Block Size
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 first or last sector will remain protected).
2. All previously protected sector groups are protected
once again.


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