am49lv6408m Meet Spansion Inc., am49lv6408m Datasheet - Page 22

• Manufacturer Part Number: am49lv6408m
• Description: Stacked Multi-chip Mcp 64 Mbit 4 M ? 16 Bit Flash Memory And 8 Mbit 512k ? 16 Bit Pseudo Static Ram
• Manufacturer: Meet Spansion Inc.

20
Sector Group
Temporary Sector
Group Unprotect
Algorithm
Device failed
Protect
Increment
PLSCNT
PLSCNT
Mode
= 25?
No
Yes
No
No
Figure 2. In-System Sector Group Protect/Unprotect Algorithms
Sector Group Protect:
sector group address
Verify Sector Group
Write 60h to sector
group address with
Protect: Write 40h
A6–A0 = 0xx0010
A6–A0 = 0xx0010
Protect complete
to sector group
RESET# = V
group address
Sector Group
from RESET#
Set up sector
address with
sector group?
PLSCNT = 1
Cycle = 60h?
Remove V
Wait 150 µs
with A6–A0
Data = 01h?
Write reset
Read from
First Write
= 0xx0010
command
Wait 1 µs
START
another
Protect
No
Yes
Yes
ID
A D V A N C E
ID
Yes
PLSCNT = 1
Reset
Am49LV6408M
I N F O R M A T I O N
must be performed for all
group protect algorithm
groups: The indicated
groups prior to issuing
the first sector group
portion of the sector
unprotected sector
Protect all sector
unprotect address
Sector Group
Unprotect
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 1000?
Yes
No
No
No
Verify Sector Group
40h to sector group
Unprotect complete
Write 60h to sector
group address with
Set up first sector
A6–A0 = 1xx0010
A6–A0 = 1xx0010
A6–A0 = 1xx0010
Unprotect: Write
RESET# = V
group address
Sector Group
from RESET#
Sector Group
address with
sector group
address with
Remove V
PLSCNT = 1
Cycle = 60h?
Data = 00h?
Wait 15 ms
Write reset
Read from
First Write
Unprotect:
Last sector
protected?
Wait 1 µs
command
All sector
verified?
START
groups
group
Yes
Yes
Yes
Yes
ID
ID
No
No
November 5, 2003
next sector group
Temporary Sector
Group Unprotect
address
Set up
Mode