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AM29PDL640G 데이터시트(PDF) 22 Page - SPANSION

부품명 AM29PDL640G
상세설명  64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory with Enhanced VersatileIO Control
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AM29PDL640G 데이터시트(HTML) 22 Page - SPANSION

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February 26, 2003
Am29PDL640G
21
P R E L I M INARY
Note:These algorithms are valid only in Persistent Sector Protection Mode. They are not valid in Password Protection Mode.
Figure 1.
In-System Sector Protection/
Sector Unprotection Algorithms
Sector Protect:
Write 60h to sector
address with
A6-A0 =
0111010
Set up sector
address
Wait 100 µs
Verify Sector
Protect: Write 40h
to sector address
with A6-A0 =
0000010
Read from
sector address
with A6-A0 =
0000010
START
PLSCNT = 1
RESET# = VID
Wait 4
µs
First Write
Cycle = 60h?
Data = 01h?
Remove VID
from RESET#
Write reset
command
Sector Protect
complete
Yes
Yes
No
PLSCNT
= 25?
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Unprotect Mode
No
Sector Unprotect:
Write 60h to sector
address with
A6-A0 =
1111010
Set up first sector
address
Wait 1.2 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A6-A0 =
0000010
Read from
sector address
with A6-A0 =
0000010
START
PLSCNT = 1
RESET# = VID
Wait 4
µs
Data = 00h?
Last sector
verified?
Remove VID
from RESET#
Write reset
command
Sector Unprotect
complete
Yes
No
PLSCNT
= 1000?
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Unprotect Mode
No
All sectors
protected?
Yes
Protect all sectors:
The indicated portion
of the sector protect
algorithm must be
performed for all
unprotected sectors
prior to issuing the
first sector
unprotect address
Set up
next sector
address
No
Yes
No
Yes
No
No
Yes
No
Sector Protect
Algorithm
Sector Unprotect
Algorithm
First Write
Cycle = 60h?
Protect another
sector?
Reset
PLSCNT = 1
Remove VID
from RESET#
Write reset
command
Sector Protect
complete
Remove VID
from RESET#
Write reset
command
Sector Unprotect
complete



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