Figure 11
Sector Protection Algorithm
Start
Set Up Sector Address
(A16, A15, A14)
PLSCNT = 1
OE = VID
A9 = VID, CE = VIL
Activate WE Pulse
Increment
PLSCNT
Time Out 100µs
Power Down OE
WE = VIH
CE = OE = VIH
A9 Should Remain VID
No
PLSCNT = 25
?
Yes
Device Failure
Read From Sector
Address = SA, A0 = 0, A1 = 1, A6 = 0
No
Data = 01H
?
Yes
Protect
Another
Yes
Sector?
No
Remove VID from A9
Write Reset Command
Sector Protection
Complete
Aeroflex Circuit Technology
15
SCD1667 REV A 4/28/97 Plainview NY (516) 694-6700