EFST
preliminary
F49L004UA / F49L004BA
Temporary Sector Unprotect Mode
This feature allows temporary unprotection of previously
protected sector to change data in-system. This mode is
activated by setting the
RESET
pin to V
ID
(11.5V-12.5V).
During this mode, all formerly protected sectors are un-
protected and can be programmed or erased by selecting
the sector addresses. Once V
ID
is removed from the
RESET
pin, all the previously protected sectors are
protected again.
Start
RESET = V
ID
(Note 1)
Perform Erase or
Program Operations
RESET = V
I H
Temporary Sector
Unprotect Completed
(Note 2)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once again.
Elite Flash Storage Technology Inc.
Publication Date : Aug. 2003
Revision: 0.2
8/46
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
