W19L320STT9F
| Model | W19L320STT9F |
| Description | Flash, 2MX16, 90ns, PDSO48, TSOP-48 |
| PDF file | Total 52 pages (File size: 2M) |
| Chip Manufacturer | WINBOND |
W19B(L)320ST/B
7.7 In-System Sector Protect/Unprotect Algorithms
START
PLSCNT=1
#RESET=V
ID
Wait 1 µ s
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
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
No
First Write
Cycle=60h?
Yes
All sector
protected?
Yes
Set up first
sector address
Sector Unrotect:
Write 60h to sector
address with
A6=1,A1=1,A0=0
Reset
PLSCNT=1
Increment
PLSCNT
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
No
Temporary Sector
Unprotect Mode
Increment
PLSCNT
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
No
PLSCNT
=25?
Yes
Data=01h?
Yes
Device failed
Protect another
sector?
No
Remove V
ID
from #RESET
Write reset
command
PLSCNT
=1000?
Yes
Yes
No
Set up
next sector
address
Data=00h?
Yes
No
Device failed
Last sector
verified
Yes
Remove V
ID
from #RESET
Write reset
command
Sector Protect
Algorithm
Sector Protect
complete
Sector Unprotect
Algorithm
Sector Unprotectt
complete
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