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AM29F080B-75FIB データシート(PDF) 10 Page - Advanced Micro Devices

部品番号 AM29F080B-75FIB
部品情報  8 Megabit (1 M x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory
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メーカー  AMD [Advanced Micro Devices]
ホームページ  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29F080B-75FIB データシート(HTML) 10 Page - Advanced Micro Devices

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Am29F080B
P R E L I M I NARY
Table 3.
Am29F080B Autoselect Codes (High Voltage Method)
Legend: L = Logic Low = VIL, H = Logic High = VIH, SGA = Sector Group Address, X = Don’t care.
Note: The system may also autoselect information in-system via the command register. See Table 5.
Sector Group Protection/Unprotection
The hardware group sector protection feature dis-
ables both program and erase operations in any sec-
tor group. Each sector group consists of two adjacent
sectors. Table 4 shows how the sectors are grouped,
and the address range that each sector group con-
tains. The hardware sector group unprotection fea-
ture re-enables both program and erase operations in
previously protected sector groups.
Sector group protection/unprotection must be imple-
mented using programming equipment. The procedure
requires a high voltage (VID) on address pin A9 and the
control pins. Details on this method are provided in a
supplement, listed in publication number 19945. Con-
tact an AMD representative to obtain a copy of the ap-
propriate document.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sector groups at its factory prior to shipping the device
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
It is possible to determine whether a sector group is
protected or unprotected. See “Autoselect Mode” for
details.
Table 4.
Sector Group Addresses
Temporary Sector Group Unprotect
This feature allows temporary unprotection of previ-
ously protected sector groups to change data in-sys-
tem. The Sector Group Unprotect mode is activated
by setting the RESET# pin to VID. During this mode,
formerly protected sector groups can be programmed
or erased by selecting the sector group addresses.
Once VID is removed from the RESET# pin, all the
pre v io us l y
pr ote c t ed
s e c t or
g r oups
are
protected again. Figure 1 shows the algorithm, and
the Temporary Sector Group Unprotect diagram
shows the timing waveforms, for this feature.
Figure 1.
Temporary Sector Group Unprotect
Operation
Description
CE#
OE#
WE#
A19
to
A12
A11
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ7
to
DQ0
Manufacturer ID: AMD
L
L
H
X
X
VID
XL
XL
L
01h
Device ID: Am29F080B
L
L
H
X
X
VID
XL
XL
H
D5h
Sector Group
Protection Verification
LL
H
SGA
X
VID
XL
X
H
L
01h (protected)
00h
(unprotected)
Sector
Group
A19
A18
A17
Sectors
SGA0
0
0
0
SA0
SA1
SGA1
0
0
1
SA2
SA3
SGA2
0
1
0
SA4
SA5
SGA3
0
1
1
SA6
SA7
SGA4
1
0
0
SA8
SA9
SGA5
1
0
1
SA10
SA11
SGA6
1
1
0
SA12
SA13
SGA7
1
1
1
SA14
SA15
START
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector Group
Unprotect
Completed (Note 2)
RESET# = VID
(Note 1)
Notes:
1. All protected sector groups unprotected.
2. All previously protected sector groups are protected
once again.
21503C-6


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