COTS PEM
BOOT SECTOR FLASH
Austin Semiconductor, Inc.
AS29LV016J
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 VID. During this mode, formerly protected sectors can be
programmed or erased by selecting the sector addresses. Once VID is removed from the RESET# pin, all the previously
protected sectors are protected again. Figure 1 shows the algorithm, and Figure 21, on page 35 shows the timing
diagrams, for this feature.
START
RESET# = VID
(Note 1)
Perform Erase or
Program Operations
RESET# = VIH
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
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS29LV016J
Rev. 0.0 02/09
12
AUSTIN [ AUSTIN SEMICONDUCTOR ]
