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E S I
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A9 High-Voltage Method
Start
Note: All sectors must be
previously protected.
Start
COUNT = 1
COUNT = 1
SET A9=OE#=V
ID
SET A9=OE#=V
ID
,
CE#, A0=V
Set Sector Address
A<18 :12>
IL
RESET#,
A6, A1=V
CE#, A6, A0=V
IL
IH
RESET#, A1=V
IH
SET WE# = V
Wait 15ms
IL
SET WE# = V
Wait 150 us
IL
SET WE# = V
IH
SET WE# = V
IH
Increase COUNT
Increase COUNT
CE#,OE#, A0=V
IL
RESET#, A6, A1=V
IH
CE#,OE#,A6,A0=V
IL
RESET#, A1 = V
IH
Set Sector AddressA<18 :12>
Read Data
Read Data
No
No
No
COUNT= 25?
Data = 01h?
Yes
No
COUNT=1000?
Data = 00h?
Yes
Increase Sector
Address
Yes
Yes
Device failed
Yes
Protect Another
Sector ?
Device failed
No
The Last Sector
Address ?
No
Remove V from
ID
A9 and Write
Yes
Reset Command
Remove V from A9 and
ID
Write Reset Command
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)
14
Rev. 0A January 5, 2006
ES29LV800E
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