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Excel Semiconductor inc.
A9 High-Voltage Method
Start
Start
Note: All sectors must be
previously protected.
COUNT = 1
COUNT = 1
SET A9=OE#=V
ID
SET A9=OE#=V
ID
Set Sector Address
A<17 :12>
CE#, A6, A0=V
IL
RESET#, A1=V
IH
CE#, A0=V
IL
,
RESET#,
A6, A1=V
IH
SET WE# = V
IL
SET WE# = V
IL
Wait 15ms
Wait 150 us
SET WE# = V
IH
Increase COUNT
SET WE# = V
IH
Increase COUNT
CE#,OE#,A6,A0=V
IL
RESET#, A1 = V
IH
CE#,OE#, A0=V
IL
RESET#, A6, A1=V
IH
Set Sector AddressA<17 :12>
Read Data
No
No
No
COUNT= 25?
Data = 01h?
No
COUNT=1000?
Yes
Yes
Yes
Device failed
Protect Another
Sector ?
Yes
Device failed
The Last Sector
Address ?
No
Remove V
ID
from
A9 and Write
Reset Command
Yes
Remove V
ID
from A9 and
Write Reset Command
No
Yes
Data = 00h?
Increase Sector
Address
Read Data
Sector Protection
Complete
Sector Unprotection
Complete
Figure 4. Sector Protection Algorithm
(A9 High-Voltage Method)
Figure 5. Sector Un-Protection Algorithm
(A9 High-Voltage Method)
13
Rev.0B January 5, 2006
ES29LV400E
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