
37
P/N:PM0556
REV. 1.3, NOV. 11, 2002
MX29F022/022NT/B
CHIP UNPROTECTION ALGORITHM FOR SYSTEM WITHOUT 12V
START
PLSCNT=1
Chip Unprotect
Complete
Data=00H
Set OE=A9=VIH
CE=VIL,A6=1
Activate WE Pulse to start
Data don't care
Set OE=CE=VIL
A9=VIH,A1=1
Write Reset Command
Device Failed
PLSCNT=1000
Increment
PLSCNT
No
Read Data from Device
Yes
Yes
No
Write "unlock for chip protect/unprotect"
Command (Table 1)
Toggle bit checking
Q6 not Toggled
Yes
No