Figure 11. SECTOR UNPROTECT ALGORITHM
START,
PLSCNT=0
Write Data AAH Address 5555H
Write Data 55H Address 2AAAH
Write Data 60H Address 5555H
Write Data AAH Address 5555H
Write Data 55H Address 2AAAH
Write Data 40H, Sector Address*
Read Status Register
NO
SR7 = 1
?
YES
Unprotect Sector
Operation Terminated
To
YES
Verify Protect
Status ?
NO
Device Stays at
Read S.R. Mode
Verify Protect Status Flow
(Figure 12)
NOTE :
*Only the Top or the Bottom Sector Address is vaild in this feature.
i.e. Sector Address = (A18,A17,A16) = 000B or 111B
INDEX
MX29F8100
Increment PLSCNT,
To Unprotect Sector Again
NO
PLSCNT
= 25 ?
NO
Data
= 00H ?
YES
Device Failed
YES
Sector Unprotected,Operation
Done, Device Stays at
Verify Sector Protect Mode
P/N: PM0262
REV. 2.0, JAN. 22, 1999
30