S71GL032A Datasheet, PDF (35/102 Pages) SPANSION – Stacked Multi-Chip Product (MCP) Flash Memory and RAM

Advance Information
Temporary Sector Group Unprotect
This feature allows temporary unprotection of previously protected sector groups
to change data in-system. The Sector Group Unprotect mode is activated by set-
ting the RESET# pin to V_ID. During this mode, formerly 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 22 shows the timing
diagrams, for this feature.
START
RESET# = V_ID
(Note 1)
Perform Erase or
Program Operations
RESET# = V_IH
Temporary Sector
Group Unprotect Completed
(Note 2)
Notes:
1. All protected sector groups unprotected (If WP# = V_IL, the highest or lowest address sector will remain protected for
uniform sector devices; the top or bottom two address sectors will remain protected for boot sector devices).
2. All previously protected sector groups are protected once again.
Figure 1. Temporary Sector Group Unprotect Operation
March 31, 2005 S71GL032A_00_A0
S71GL032A Based MCPs
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