A d v a n c e I n f o r m a t i o n
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 setting the RESET# pin to V . During this mode, formerly protected sector
ID
groups can be programmed or erased by selecting the sector group addresses.
Once V is removed from the RESET# pin, all the previously protected sector
ID
groups are protected again. Figure 1 shows the algorithm, and Figure 22, on
page 76 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 highest or lowest address sector remains protected for
uniform sector devices; the top or bottom two address sectors remains protected for boot sector devices).
2. All previously protected sector groups are protected once again.
Figure 1. Temporary Sector Group Unprotect Operation
April 22, 2005 S29GL-A_00_A3
S29GL-A MirrorBit™ Flash Family
35
SPANSION [ SPANSION ]
