MX29F040 Datasheet, PDF (31/40 Pages) Macronix International – 4M-BIT [512KX8] CMOS EQUAL SECTOR FLASH MEMORY

MX29F040
CHIP UNPROTECTION ALGORITHM FOR SYSTEM WITHOUT 12V
START
Protect All Sectors
PLSCNT=1
Write "unlock for sector protect/unprotect"
Command (Table 1)
Set OE=A9=VIH
CE=VIL,A6=1
Activate WE Pulse to start
Data do'nt care
No
Toggle bit checking
Q6 not Toggled
Yes
Set OE=CE=VIL
A9=VIH,A1=1
Set Up First Sector Addr
Increment
PLSCNT
Increment
Sector Addr
Read Data from Device
No
Data=00H?
Yes
No
All sectors have
been verified?
Yes
Write Reset Command
Chip Unprotect
Complete
No
PLSCNT=1000?
Yes
Device Failed
* It is recommended before unprotect whole chip, all sectors should be protected in advance.
P/N:PM0538
REV. 2.3, DEC. 10, 2004
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