s29al008d Meet Spansion Inc., s29al008d Datasheet - Page 20

• Manufacturer Part Number: s29al008d
• Description: 8 Megabit 1 M X 8-bit/512 K X 16-bit Cmos 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

20
Sector Protect
Temporary Sector
Unprotect Mode
Device failed
Algorithm
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#
Set up sector
Verify Sector
PLSCNT = 1
Cycle = 60h?
address with
with A6 = 0,
with A6 = 0,
Remove V
Data = 01h?
Wait 150 µs
Write reset
Read from
First Write
Wait 1 ms
command
complete
Figure 7.2 In-System Sector Protect/Sector Unprotect Algorithms
address
START
sector?
A0 = 0
Yes
Yes
No
ID
ID
Yes
PLSCNT = 1
Reset
S29AL008D
The indicated portion
unprotected sectors
of the sector protect
prior to issuing the
Protect all sectors:
unprotect address
algorithm must be
D a t a
performed for all
Sector Unprotect
first sector
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 1000?
S h e e t
No
Yes
No
No
Write 60h to sector
Set up first sector
Sector Unprotect:
S29AL008D_00_A10 November 27, 2007
Unprotect: Write
Sector Unprotect
A6 = 1, A1 = 1,
A6 = 1, A1 = 1,
sector address
RESET# = V
A1 = 1, A0 = 0
40h to sector
from RESET#
Verify Sector
address with
Cycle = 60h?
PLSCNT = 1
address with
with A6 = 1,
Remove V
Data = 00h?
Wait 15 ms
Write reset
Read from
First Write
Last sector
Wait 1 ms
protected?
command
All sectors
complete
address
verified?
START
A0 = 0
A0 = 0
Yes
Yes
Yes
Yes
ID
ID
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up