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DS42587 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 17 Page - Advanced Micro Devices

๋ถ€ํ’ˆ๋ช… DS42587
์ƒ์„ธ๋‚ด์šฉ  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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DS42587 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 17 Page - Advanced Micro Devices

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DS42587
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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 โ€œsectorโ€
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
7).
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 โ€“ 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.
Figure 1.
Temporary Sector Unprotect Operation
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.


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