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AM50DL128CG 데이터시트(HTML) 20 Page - SPANSION

부품명 AM50DL128CG
상세내용  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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AM50DL128CG 데이터시트(HTML) 20 Page - SPANSION

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November 7, 2002
Am50DL128CG
19
P R E L I M I NARY
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 6.
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
5).
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 24 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
V
IH
Enables programming and erasing in
SA0, SA1, SA140, and SA141
V
HH
Enables accelerated programming
(ACC). See “Accelerated Program
Operation” on page 12.
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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