AM29PDL640G AMD [Advanced Micro Devices], AM29PDL640G Datasheet - Page 23

• Manufacturer Part Number: AM29PDL640G
• Description: 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory with Enhanced VersatileIOTM Control
• Manufacturer: AMD [Advanced Micro Devices]

Note:These algorithms are valid only in Persistent Sector Protection Mode. They are not valid in Password Protection Mode.
December 13, 2005
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
Protect another
Sector Protect:
sector address
RESET# = V
from RESET#
Sector Protect
Verify Sector
Set up sector
with A6-A0 =
Cycle = 60h?
with A6-A0 =
Remove V
PLSCNT = 1
address with
Data = 01h?
Wait 100 µs
Write reset
Read from
First Write
command
Wait 4 μs
complete
A6-A0 =
0111010
0000010
address
0000010
START
sector?
Yes
Yes
No
ID
ID
Figure 1. In-System Sector Protection/
Yes
Sector Unprotection Algorithms
PLSCNT = 1
D A T A S H E E T
Reset
Am29PDL640G
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 A6-A0 =
Cycle = 60h?
Remove V
PLSCNT = 1
address with
Data = 00h?
Wait 1.2 ms
Write reset
Read from
First Write
Last sector
protected?
command
Wait 4 μs
All sectors
complete
A6-A0 =
1111010
A6-A0 =
0000010
0000010
verified?
address
START
Yes
Yes
Yes
Yes
ID
ID
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up
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