MX29LV640BT/BB
Figure 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
Sector 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 15 ms
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
Sector Unprotect complete
P/N:PM1076
REV. 1.2, SEP. 07, 2005
50
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