MX29LV320AT/B
Fig 14. IN-SYSTEM SECTOR GROUP PROTECT/CHIP UNPROTECT ALGORITHMS WITH RESET=VID
START
START
Protect all sectors:
PLSCNT=1
The indicated portion of
PLSCNT=1
the sector protect algorithm
must be performed
RESET=VID
for all unprotected sectors
RESET=VID
prior to issuing the first
sector unprotect address
Wait 1us
Wait 1us
No
First Write
Temporary Sector
Unprotect Mode
Cycle=60h?
First Write
No
Temporary Sector
Unprotect Mode
Cycle=60h?
Yes
Yes
Set up sector address
No
All sectors
protected?
Sector Protect:
Write 60h to sector
address with
A6=0, A1=1, A0=0
Yes
Set up first sector address
Wait 150us
Chip Unprotect:
Write 60h to sector
address with
Verify Sector Protect:
Write 40h to sector
address with
Reset
PLSCNT=1
A6=1, A1=1, A0=0
A6=0, A1=1, A0=0
Increment PLSCNT
Wait 15ms
Read from
sector address
with
A6=0, A1=1, A0=0
Verify Sector Unprotect:
Write 40h to sector
address with
No
Increment PLSCNT
A6=1, A1=1, A0=0
No
Data=01h?
Yes
PLSCNT=25?
Read from
sector address
with
Yes
A6=1, A1=1, A0=0
No
Device failed
Reset
Yes
Protect another
sector?
PLSCNT=1
No
PLSCNT=1000?
Data=00h?
Yes
No
Sector Protect
Algorithm
Yes
Remove VID from RESET
Device failed
No
Last sector
verified?
Write reset command
Yes
Chip Unprotect
Algorithm
Sector Protect complete
Remove VID from RESET
Write reset command
Chip Unprotect complete
P/N:PM1008
REV. 1.1, MAY 28, 2004
43
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