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AM29PDL128G80 データシート(PDF) 28 Page - SPANSION

部品番号 AM29PDL128G80
部品情報  128 Megabit (8 M x 16-Bit/4 M x 32-Bit) CMOS 3.0 Volt-only, Simultaneous Read/ Write Flash Memory with VersatileIO Control
PDF  69 Pages
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メーカー  SPANSION [SPANSION]
ホームページ  http://www.spansion.com
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AM29PDL128G80 データシート(HTML) 28 Page - SPANSION

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July 29, 2002
Am29PDL128G
27
P R E L I M I NARY
Figure 1.
In-System Sector Protection/
Sector Unprotection Algorithms
Note:These algorithms are valid only in Persistent Sector Protection mode. They are not valid in Password Protection Mode.
Sector Protect:
Write 60h to sector
address with
A6-A0 =
0111010
Set up sector
address
Wait 150 µs
Verify Sector
Protect: Write 40h
to sector address
with A6-A0 =
0111010
Read from
sector address
with A6-A0 =
0111010
START
PLSCNT = 1
RESET# = VID
Wait 1
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 15 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A6-A0 =
1111010
Read from
sector address
with A6-A0 =
1111010
START
PLSCNT = 1
RESET# = VID
Wait 1
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



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