s29al016m Meet Spansion Inc., s29al016m Datasheet - Page 20

• Manufacturer Part Number: s29al016m
• Description: 16 Megabits 2m X 8-bits / 1m X 16-bits
• Manufacturer: Meet Spansion Inc.

18
In-System Single
Sector Protect
Temporary Sector
High Voltage
Unprotect Mode
Device failed
Algorithm
Increment
PLSCNT
PLSCNT
= 25?
No
Yes
Figure 2. In-System Single High Voltage Sector Protect/Unprotect Algorithms
No
No
Write 60h to sector
Protect: Write 40h
to sector address
A6 = 0, A1 = 1,
Sector Protect:
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Protect another
sector address
RESET# = V
Sector Protect
Verify Sector
Set up sector
with A6 = 0,
with A6 = 0,
from RESET#
Cycle = 60h?
address with
Remove V
Data = 01h?
PLSCNT = 1
Wait 150 µs
Write reset
Read from
First Write
Wait 1 ms
command
complete
address
A0 = 0
START
sector?
No
Yes
Yes
ID
ID
Yes
PLSCNT = 1
Reset
S29AL016M
D a t a
The indicated portion
unprotected sectors
of the sector protect
prior to issuing the
Protect all sectors:
unprotect address
algorithm must be
performed for all
In-System Single
Sector Unprotect
first sector
High Voltage
Algorithm
Device failed
Increment
S h e e t
= 1000?
PLSCNT
PLSCNT
No
Yes
No
No
Write 60h to sector
Set up first sector
Sector Unprotect:
Unprotect: Write
Sector Unprotect
A6 = 1, A1 = 1,
A6 = 1, A1 = 1,
A1 = 1, A0 = 0
RESET# = V
sector address
40h to sector
Verify Sector
address with
with A6 = 1,
from RESET#
Cycle = 60h?
address with
Remove V
PLSCNT = 1
Data = 00h?
Write reset
Wait 15 ms
Read from
First Write
Last sector
Wait 1 ms
protected?
command
All sectors
complete
verified?
address
A0 = 0
A0 = 0
START
Yes
Yes
Yes
Yes
S29AL016M_00_A7 October 11, 2006
ID
ID
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up