am41lv3204m Meet Spansion Inc., am41lv3204m Datasheet - Page 21

• Manufacturer Part Number: am41lv3204m
• Description: Stacked Multi-chip Package Mcp 32 Mbit 4 M ? 8 Bit/2 M ? 16-bit Flash Memory And 4 Mbit 512k ? 8-bit/256 K ? 16-bit Static Ram Preliminary
• 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
from RESET#
Sector Group
Set up sector
address with
sector group?
Cycle = 60h?
Remove V
PLSCNT = 1
Wait 150 µs
with A6–A0
Data = 01h?
Write reset
Read from
First Write
= 0xx0010
command
Wait 1 s
START
another
Protect
No
Yes
Yes
ID
ID
Yes
P R E L I M I N A R Y
PLSCNT = 1
Reset
Am41LV3204M
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?
No
Yes
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
address with
Cycle = 60h?
sector group
Remove V
PLSCNT = 1
Data = 00h?
Write reset
Wait 15 ms
Read from
Last sector
First Write
protected?
Unprotect:
command
Wait 1 s
All sector
verified?
START
groups
group
Yes
Yes
Yes
Yes
ID
ID
No
No
next sector group
Temporary Sector
Group Unprotect
June 10, 2003
address
Set up
Mode