R
MX29LV160BT/BB
Figure 17. CHIP UNPROTECTION ALGORITHM (A9, OE Control)
START
Protect All Sectors
PLSCNT=1
Set OE=A9=VID
CE=VIL,A6=1
Activate WE Pulse
Time Out 50ms
Increment
PLSCNT
Set OE=CE=VIL
A9=VID, A1=1, A6=0, A0=0
Set Up First Sector Addr
Read Data from Device
No
No
Data=00H?
Increment
PLSCNT=1000?
Sector Addr
Yes
Yes
Device Failed
No
All sectors have
been verified?
Yes
Remove VID from A9
Write Reset Command
Chip Unprotect
Complete
* It is recommended before unprotect whole chip, all sectors should be protected in advance.
P/N:PM1041
REV. 1.2, JUL. 01, 2004
43