EN29LV400A
Flowchart 7b. In-System Sector Unprotect Flowchart
START
PLSCNT = 1
Protect all sectors:
The indicated portion
of the sector protect
RESET# = VID
algorithm must be
performed for all
Wait 1 µS
unprotected sectors
prior to issuing the
first sector unprotect
No
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.
©2005 Eon Silicon Solution, Inc., www.essi.com.tw
22
Rev. A, Issue Date: 2005/01/07
EON [ EON SILICON SOLUTION INC. ]
