MX29LV800C T/B
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
Set Up First Sector Addr
Read Data from Device
No
No
Data=00H?
Yes
PLSCNT=1000?
Increment
Sector Addr
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:PM1183
REV. 1.4, APR. 24, 2006
44