W19B320ABT7H Winbond Electronics, W19B320ABT7H Datasheet - Page 32

• Manufacturer Part Number: W19B320ABT7H
• Description: IC FLASH 32MBIT 70NS 48TSOP
• Manufacturer: Winbond Electronics

Specifications of W19B320ABT7H

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 32M (4Mx8, 2Mx16)
• Speed: 70ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.7 In-System Sector Protect/Unprotect Algorithms
Sector Protect
Device failed
Temporary Sector
Algorithm
Unprotect Mode
Increment
PLSCNT
PLSCNT
=25?
No
Yes
No
No
Write 60h to sector
to sector address
Protect:Write 40h
A6=0,A1=1,A0=0
sector address
Protect another
Set up sector
Sector Protect
Wait 150 μ s
Sector Protect:
Verity Sector
from #RESET
First Write
Write reset
Read from
with A6=0,
A1=1,A0=0
Remove V
#RESET=V ID
address
address with
with A6=0,
Data=01h?
Cycle=60h?
Wait 1 μ s
A1=1,A0=0
PLSCNT=1
complete
command
sector?
START
Yes
No
ID
Yes
Yes
PLSCNT=1
Reset
prior to issuing the
of the sector protect
The indicated portion
unprotected sectors
unprotect address
Protect all sectors
performed for all
algorithm must be
first sector
Sector Unprotect
- 32 -
Algorithm
Device failed
Increment
=1000?
PLSCNT
PLSCNT
No
Yes
No
No
sector address
to sector address
Unprotect:Write 40h
Sector Unprotect:
A6=1,A1=1,A0=0
Write 60h to any
Sector Unprotect
Set up first sector
with A6=1,
Read from
#RESET=V
A1=1,A0=0
address with
Verity Sector
Wait 1 μ s
All sectors
from #RESET
First Write
Write reset
Data=00h?
Remove V
PLSCNT=1
Wait 15 mS
Cycle=60h?
protected ?
with A6=1,
complete
Last sector
A1=1,A0=0
command
START
address
verified
W19B320AT/B
Yes
Yes
ID
ID
Yes
Yes
No
No
next sector
Set up
address
Temporary Sector
Unprotect Mode