EN29LV641H/L EN29LV640U
Flowchart 6a. In-System Sector Group Protect Flowchart
START
PLSCNT = 1
RESET# = VID
Wait 1 µs
No
First Write
Cycle =
60h?
Temporary Sector
Group Unprotect Mode
Yes
Set up sector
group address
To Protect: Write 60h to
sector group addr with
A6 = 0, A1 = 1, A0 = 0
Wait 150 µs
To Verify: Write 40h to
sector group address
with
A6 = 0, A1 = 1, A0 = 0
Increment
PLSCNT
Reset
PLSCNT = 1
Wait 0.4 µs
Read from sector
address with
A6 = 0, A1 = 1, A0
No
No
Data = 01h?
Yes
PLSCNT = 25?
Yes
Device failed
Yes
Protect another
sector?
No
Remove VID
from RESET#
Write reset
command
Sector Group
Protect complete
Sector Group Protect Algorithm
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
28
Rev. B, Issue Date: 2005/06/27
EON [ EON SILICON SOLUTION INC. ]
