EN29LV160A
Flowchart 7b. In-System Sector Unprotect Flowchart
START
PLSCNT = 1
Protect all sectors:
The indicated
portion of the sector
RESET# = VID
protect algorithm
must be performed
Wait 1 µS
for all unprotected
sectors prior to
issuing the first
No
sector unprotect
address (see
Diagram 7a.)
Temporary Sector
Unprotect Mode
First Write
Cycle = 60h?
Yes
No
All sectors
protected?
Yes
Set up first sector
address
Sector Unprotect: Write 60H to
sector address with A6 = 1,
A1 = 1, A0 = 0
Wait 15 ms
Verify Sector Unprotect:
Write 40h to sector address
with A6 = 1, A1 = 1, A0 =0
Increment
PLSCNT
Wait 0.4 µS
Read from sector address with
A6 = 1, A1 = 1, A0 = 0
No
No
PLSCCNT =
1000?
Set up next sector
Data = 00h?
address
Yes
Yes
Sector
Unprotect
Algorithm
No
Last sector
verified?
Device failed
Yes
Remove VID from
RESET#
Write reset
command
Sector Unprotect
complete
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.essi.com.tw
25
Rev. I, Issue Date: 2008/07/17
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
