MX29LV401T Datasheet, PDF (38/56 Pages) Macronix International – 4M-BIT [512K x 8 / 256K x 16] CMOS SINGLE VOLTAGE 3V ONLY FLASH MEMORY

MX29LV401T/B
Figure 17. IN-SYSTEM SECTOR UNPROTECTION ALGORITHM WITH RESET=VID
P/N:PM0853
Increment PLSCNT
No
PLSCNT=1000?
Yes
Device failed
START
PLSCNT=1
RESET=VID
Wait 1us
First Write
No
Cycle=60H ?
Yes
All sector
No
protected?
Yes
Set up first sector address
Sector unprotect :
write 60H with
A6=1, A1=1, A0=0
Wait 50ms
Verify sector unprotect
write 40H to sector address
with A6=1, A1=1, A0=0
Read from sector address
with A6=1, A1=1, A0=0
Temporary Sector
Unprotect Mode
Protect all sectors
No
Data=00H ?
Set up next sector address
Yes
Last sector
Yes
verified?
No
Remove VID from RESET
Write reset command
Sector unprotect complete
38
REV. 0.0, SEP. 14, 2001