
ESI
17
Rev. 2D Jan 5, 2006
ES29LV320D
Excel Semiconductor inc.
START
RESET# = V
ID
Set up sector
address
COUNT = 1
Wait 1us
First Write
Cycle = 60h
Sector Protect:
Write 60h to sec-
tor address with
A6 = 0, A1 = 1,
A0 = 0
Wait 150us
Verify Sector
Protect:
Write 40h to sec-
tor address with
A6 = 0, A1 = 1,
A0 = 0
Data = 01h
Protect another
sector
Remove V
ID
from RESET#
Write reset
command
Sector Protect
complete
Temporary Sector
Unprotect Mode
No
COUNT=25
Increment
COUNT
Read from sec-
tor address with
A6 = 0, A1 = 1,
A0 = 0
Device failed
No
Yes
Yes
No
No
Reset
COUNT = 1
Yes
Figure 3. In-System Sector
Protect Algorithm
Yes
START
RESET# = V
ID
Set up first sector
address
COUNT = 1
Wait 1us
First Write
Cycle = 60h
Sector Unpro-
tect:
Write 60h to sec-
tor address with
A6 = 1, A1 = 1,
Wait 15ms
Verify Sector
Unprotect:
Write 40h to sec-
tor address with
A6 = 1, A1 = 1,
A0 = 0
Data = 00h
Last sector
verified
Remove V
ID
from
RESET#
Write reset
command
Sector Unprotect
complete
Temporary Sector
Unprotect Mode
No
COUNT
=1000
Increment
COUNT
Read from sec-
tor address with
A6 = 1, A1 = 1,
A0 = 0
Device failed
No
Yes
Yes
No
No
Set up next
sector address
Yes
Yes
All sectors
protected
Protect all sectors:
The indicated por-
tion of the sector
protect algorithm
must be performed
for all unprotected
sectors prior to
issuing the first
sector unprotect
address
No
Yes
Figure 4. In-System Sector
Unprotect Algorithm
In-System Protection / Unprotection Method