W19B160BT Datasheet, PDF (27/48 Pages) Winbond – 16Mbit, 2.7~3.6 volt CMOS flash memory

W19B160BT/B DATA SHEET
8.11 In-System Sector Protect/Unprotect Algorithms
Temporary Sector
Unprotect Mode
START
PLSCNT=1
#RESET=V ID
Wait 1 μ s
No
First Write
Cycle=60h?
Yes
Set up sector
address
Sector Protect:
Write 60h to sector
address with
A6=0,A1=1,A0=0
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?
Yes
All sector
No
protected?
Yes
Set up first
sector address
No _{Temporary Sector}
Unprotect Mode
Increment
PLSCNT
No
Wait 150 μ s
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
Reset
PLSCNT=1
Increment
PLSCNT
Sector Unrotect:
Write 60h to sector
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
No
PLSCNT
=25?
Yes
Device failed
Sector Protect
Algorithm
Data=01h?
Yes
Protect another
sector?
No
Remove V ID
from #RESET
Write reset
command
Sector Protect
complete
Read from
sector address
with A6=1,
A1=1,A0=0
No
PLSCNT
=1000?
No
Data=00h?
Set up
next sector
address
Yes
Yes
Yes
Device failed
Sector Unprotect
Algorithm
No
Last sector
verified?
Yes
Remove V ID
from #RESET
Write reset
command
Sector Unprotectt
complete
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Publication Release Date:Jan.04, 2008
Revision A5