W19B320B Datasheet, PDF (31/51 Pages) Winbond – 32Mbit, 2.7~3.6-volt single bank CMOS flash memory

W19B320BT/B DATASHEET
7.7 In-System Sector Protect/Unprotect Algorithms
START
PLSCNT=1
#RESET=VID
Wait 1 μ s
Temporary Sector
Unprotect Mode
No
First Write
Cycle=60h?
Yes
Set up sector
address
Sector Protect:
Write 60h to sector
address with
A6=0,A1=1,A0=0
Wait 150 μ s
Increment
PLSCNT
No
Verity Sector
Protect:Write 40h
to sector address
with A6=0,
A1=1,A0=0
Read from
sector address
with A6=0,
A1=1,A0=0
No
PLSCNT
=25?
Yes
Data=01h?
Yes
Device failed
Sector Protect
Algorithm
Protect another
sector?
No
Remove VID
from #RESET
Write reset
command
Sector Protect
complete
Protect all sectors
The indicated portion
of the sector protect
algorithm must be
performed for all
unprotected sectors
prior to issuing the
first sector
unprotect address
START
PLSCNT=1
#RESET=V_ID
Wait 1 μ s
First Write
Cycle=60h?
No
Temporary Sector
Unprotect Mode
Yes
No
All sectors
protected ?
Yes
Set up first sector
address
Reset
PLSCNT=1
Increment
PLSCNT
Sector Unprotect:
Write 60h to any
address with
A6=1,A1=1,A0=0
Wait 15 mS
Verity 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
No
Set up
next sector
Yes
PLSCNT
=1000?
No
Data=00h?
address
Yes
Yes
Device failed
Sector Unprotect
Algorithm
No
Last sector
verified
Yes
Remove VID
from #RESET
Write reset
command
Sector Unprotect
complete
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Publication Release Date:Dec, 22, 2008
Revisionv A5