P r e l i m i n a r y
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 . During this mode, formerly protected sector groups
ID
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 23 shows the timing
diagrams, for this feature.
START
RESET# = VID
(Note 1)
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Group Unprotect Completed
(Note 2)
Notes:
1. All protected sector groups unprotected (If WP# = VIL, the first or last sector will remain protected).
2. All previously protected sector groups are protected once again.
Figure 1. Temporary Sector Group Unprotect Operation
94
S29GLxxxM MirrorBitTM Flash Family
S29GLxxxM_00A5 April 30, 2004
SPANSION [ SPANSION ]
