AM29LV160DT-70EC\T Spansion, AM29LV160DT-70EC\T Datasheet - Page 18

• Manufacturer Part Number: AM29LV160DT-70EC\T
• Manufacturer: Spansion

16
Sector Protect
Temporary Sector
Unprotect Mode
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 25?
No
Yes
No
No
Write 60h to sector
Protect: Write 40h
to sector address
A6 = 0, A1 = 1,
Protect another
Sector Protect:
sector address
RESET# = V
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Sector Protect
from RESET#
Verify Sector
Set up sector
PLSCNT = 1
Cycle = 60h?
Remove V
address with
with A6 = 0,
with A6 = 0,
Data = 01h?
Wait 150 µs
Write reset
Read from
First Write
command
Wait 1 μs
complete
Figure 2. In-System Sector Protect/Unprotect Algorithms
address
START
sector?
A0 = 0
Yes
No
Yes
ID
ID
Yes
PLSCNT = 1
D A T A
Reset
Am29LV160D
The indicated portion
Protect all sectors:
unprotected sectors
of the sector protect
prior to issuing the
unprotect address
S H E E T
algorithm must be
performed for all
Sector Unprotect
first sector
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 1000?
Yes
No
No
No
Write 60h to sector
Set up first sector
Sector Unprotect:
Unprotect: Write
Sector Unprotect
A6 = 1, A1 = 1,
A6 = 1, A1 = 1,
RESET# = V
sector address
A1 = 1, A0 = 0
from RESET#
Verify Sector
40h to sector
address with
PLSCNT = 1
Cycle = 60h?
address with
Remove V
with A6 = 1,
Data = 00h?
Write reset
Wait 15 ms
Read from
Last sector
First Write
protected?
command
Wait 1 μs
All sectors
complete
address
verified?
START
A0 = 0
A0 = 0
Yes
Yes
Yes
Yes
ID
ID
No
No
May 5, 2006 22358B7
Temporary Sector
Unprotect Mode
next sector
address
Set up