am49pdl127ah Meet Spansion Inc., am49pdl127ah Datasheet - Page 40

• Manufacturer Part Number: am49pdl127ah
• Description: Stacked Multi-chip Package Mcp Flash Memory And Psram, 128 Megabit 8m ? 16-bit Cmos 3.0 Volt-only, Simultaneous Operation Flash Memory And 16 Mbit 1m ? 16-bit Cmos Pseudo Static Ram
• Manufacturer: Meet Spansion Inc.

38
Temporary Sector
Unprotect Mode
Sector Protect
from RESET#
Remove V
Device failed
Increment
Write reset
PLSCNT
PLSCNT
command
complete
= 25?
No
Yes
Sector Protect
ID
Algorithm
No
No
Write 60h to sector
Protect: Write 40h
to sector address
Sector Protect:
sector address
Protect another
RESET# = V
Sector Protect
from RESET#
Set up sector
Verify Sector
with A7-A0 =
Cycle = 60h?
with A7-A0 =
PLSCNT = 1
address with
Remove V
Wait 100 µs
Data = 01h?
Write reset
Read from
First Write
00000010
00000010
command
Wait 4 µs
00000010
complete
A7-A0 =
address
START
sector?
Yes
Yes
No
A D V A N C E
ID
ID
Figure 1. In-System Sector Protection/
Yes
Am49PDL127AH/Am49PDL129AH
Sector Unprotection Algorithms
PLSCNT = 1
Reset
I N F O R M A T I O N
The indicated portion
Protect all sectors:
unprotected sectors
of the sector protect
prior to issuing the
unprotect address
algorithm must be
performed for all
first sector
Sector Unprotect
from RESET#
Device failed
Remove V
Write reset
Increment
command
PLSCNT
PLSCNT
complete
= 1000?
Yes
No
Sector Unprotect
ID
Algorithm
No
No
Write 60h to sector
Set up first sector
Sector Unprotect:
Unprotect: Write
Sector Unprotect
sector address
RESET# = V
Verify Sector
40h to sector
from RESET#
address with
with A7-A0 =
Cycle = 60h?
Remove V
PLSCNT = 1
address with
Data = 00h?
Wait 1.2 ms
Write reset
Read from
First Write
Last sector
01000010
00000010
00000010
protected?
command
Wait 4 µs
All sectors
complete
A7-A0 =
A7-A0 =
verified?
address
START
Yes
Yes
Yes
Yes
ID
ID
No
December 18, 2003
No
Temporary Sector
Unprotect Mode
next sector
address
Set up