D A T A S H E E T
START
START
PLSCNT = 1
PLSCNT = 1
RESET# = VID
Protect all sector
groups: The indicated
portion of the sector
group protect algorithm
must be performed for all
unprotected sector
groups prior to issuing
the first sector group
unprotect address
RESET# = VID
Wait 1 μs
Wait 1 μs
Temporary Sector
Group Unprotect
Mode
Temporary Sector
Group Unprotect
Mode
No
No
First Write
Cycle = 60h?
First Write
Cycle = 60h?
Yes
Yes
Set up sector
group address
All sector
groups
No
protected?
Yes
Sector Group Protect:
Write 60h to sector
group address with
A6–A0 = 0xx0010
Set up first sector
group address
Sector Group
Unprotect:
Wait 150 µs
Write 60h to sector
group address with
A6–A0 = 1xx0010
Verify Sector Group
Protect: Write 40h
to sector group
address with
A6–A0 = 0xx0010
Reset
PLSCNT = 1
Increment
PLSCNT
Wait 15 ms
Verify Sector Group
Unprotect: Write
40h to sector group
address with
Read from
sector group address
with A6–A0
= 0xx0010
Increment
PLSCNT
A6–A0 = 1xx0010
No
No
PLSCNT
= 25?
Read from
sector group
address with
Data = 01h?
Yes
A6–A0 = 1xx0010
No
Yes
Set up
next sector group
address
Protect
another
sector group?
Yes
No
PLSCNT
= 1000?
Data = 00h?
Yes
Device failed
No
Yes
Remove VID
from RESET#
Last sector
group
verified?
No
Device failed
Write reset
command
Yes
Remove VID
from RESET#
Sector Group
Unprotect
Sector Group
Protect
Sector Group
Protect complete
Write reset
command
Algorithm
Algorithm
Sector Group
Unprotect complete
Figure 2. In-System Sector Group
Protect/Unprotect Algorithms
December 14, 2005
Am29LV640MH/L
19
SPANSION [ SPANSION ]
