s29al016j Meet Spansion Inc., s29al016j Datasheet - Page 21

• Manufacturer Part Number: s29al016j
• Description: 16 Megabit 2 M X 8-bit/1 M X 16-bit Cmos 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

May 23, 2008 S29AL016J_00_05
Sector Protect
Temporary Sector
Unprotect Mode
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 25?
No
Yes
D a t a
No
No
Write 60h to sector
Protect: Write 40h
to sector address
Sector Protect:
sector address
Protect another
RESET# = V
A1 = 1, A0 = 0
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Sector Protect
from RESET#
Set up sector
Verify Sector
Cycle = 60h?
A3 = A2 = 0,
A3 = A2 = 0,
PLSCNT = 1
address with
A3 = A2 = 0,
Remove V
Data = 01h?
Wait 150 µs
with A6 = 0,
with A6 = 0,
Write reset
Read from
First Write
command
Wait 1 µs
complete
address
A6 = 0,
START
sector?
S h e e t
Figure 7.3 In-System Sector Protect/Unprotect Algorithms
Yes
No
Yes
ID
ID
Yes
( A d v a n c e
PLSCNT = 1
Reset
S29AL016J
The indicated portion
unprotected sectors
Protect all sectors:
of the sector protect
I n f o r m a t i o n )
prior to issuing the
unprotect address
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
sector address
RESET# = V
A1 = 1, A0 = 0
A1 = 1, A0 = 0
A1 = 1, A0 = 0
40h to sector
from RESET#
Verify Sector
address with
Cycle = 60h?
A3 = A2 = 0,
A3 = A2 = 0,
PLSCNT = 1
address with
A3 = A2 = 0,
Remove V
Data = 00h?
Wait 1.5 ms
with A6 = 1,
Write reset
Read from
First Write
Last sector
protected?
command
Wait 1 µs
All sectors
complete
verified?
address
A6 = 1,
A6 = 1,
START
Yes
Yes
Yes
Yes
ID
ID
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up
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