PUMA 68F16006/A-80/90/12/15
ISSUE 4.3 : November 1998
SECTOR PROTECTION ALOGORITHM
START
Set Up Sector Addr
(A20, A19, A18)
PLSCNT = 1
OE=VID, A9=VID
OE = VID, A9 = VID
CCEE==VVILIL,,RREESSEETT==VVIIHH
Activate WE Pulse
Time Out 100us
Power Down OE
WE = VIH
CE=OE=VIL
A9 should remain VID
Increment
PLSCNT
Read from Sector
Addr=SA, A1, A0 = 10 , A6 = 0
NO
NO
Data
=01H
?
PLSCNT
= 25
?
YES
YES
Remove VID from A9
Write Reset Command
Protect
Another
Sector
YES
Device Failed
NO
Remove VID From A9
Write Reset Command
Sector Protection
Complete
15