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AM42DL16X4D 데이터시트(HTML) 19 Page - SPANSION

부품명 AM42DL16X4D
상세내용  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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AM42DL16X4D 데이터시트(HTML) 19 Page - SPANSION

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18
Am42DL16x4D
January 9, 2002
P R E L IMINARY
If the system asserts V
IL on the WP#/ACC pin, the de-
vice disables program and erase functions in the two
“outermost” 8 Kbyte boot sectors independently of
whether those sectors were protected or unprotected
using the method described in “The autoselect mode
provides manufacturer and device identification, and
sector protection verification, through identifier codes
output on DQ7–DQ0. The autoselect codes can be ac-
cessed in-system through the command register.
Refer to the Autoselect Command Sequence section
for more information.Sector/Sector Block Protection
and Unprotection”. The two outermost 8 Kbyte boot
sectors are the two sectors containing the lowest ad-
dresses in a top-boot-configured device, or the two
s e ct or s c ontai ning th e hi ghest addr es s e s i n a
top-boot-configured device.
If the system asserts V
IH on the WP#/ACC pin, the de-
vice reverts to whether the two outermost 8 Kbyte boot
sectors were last set to be protected or unprotected.
That is, sector protection or unprotection for these two
sectors depends on whether they were last protected
or unprotected using the method described in “The au-
toselect mode provides manufacturer and device
identification, and sector protection verification,
through identifier codes output on DQ7–DQ0. The au-
toselect codes can be accessed in-system through the
command register. Refer to the Autoselect Command
Sequence section for more information.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.
Temporary Sector/Sector Block 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 Tables
8 and 9).
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 (8.5 V – 12.5 V). During this mode,
formerly protected sectors can be programmed or
erased by selecting the sector addresses. Once V
ID is
removed from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure 1 shows the
algorithm, and Figure 25 shows the timing diagrams,
for this feature.
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,
outermost boot sectors will remain protected).
2. All previously protected sectors are protected once
again.
Figure 1.
Temporary Sector Unprotect Operation


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