AM29LV160MB-100EI Datasheet, PDF (18/63 Pages) SPANSION – 16 Megabit (2 M x 8-Bit/1 M x 16-Bit) MirrorBitTM 3.0 Volt-only Boot Sector Flash Memory

Data Sheet
the factory prior to shipping the device. Contact a sales office or representative
for details.
It is possible to determine whether a sector is protected or unprotected. See “Au-
toselect Mode” on page 15 for details.
Sector protection and unprotection requires V_ID on the RESET# pin only, and can
be implemented either in-system or via programming equipment. Figure 2, on
page 17 shows the algorithms and Figure 23, on page 50 shows the timing dia-
gram. This method uses standard microprocessor bus cycle timing. For sector
unprotect, all unprotected sectors must first be protected prior to the first sector
unprotect write cycle.
Temporary Sector Unprotect
This feature allows temporary unprotection of previously protected sectors to
change data in-system. The Sector Unprotect mode is activated by setting the
RESET# pin to V_ID. During this mode, formerly protected sectors can be pro-
grammed or erased by selecting the sector addresses. Once V_ID is removed from
the RESET# pin, all the previously protected sectors are protected again. Figure
2, on page 17 shows the algorithm, and Figure 22, on page 49 shows the timing
diagrams, for this feature.
START
RESET# = V_ID
(Note 1)
Perform Erase or
Program Operations
RESET# = V_IH
Temporary Sector
Unprotect Completed
(Note 2)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once again.
Figure 1. Temporary Sector Unprotect Operation
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Am29LV160M
25974B5 January 31, 2007