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AM29LV002T-150FEB Datasheet(PDF) 10 Page - Advanced Micro Devices

No. de pieza AM29LV002T-150FEB
Descripción Electrónicos  2 Megabit (256 K x 8-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
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Fabricante Electrónico  AMD [Advanced Micro Devices]
Página de inicio  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29LV002T-150FEB Datasheet(HTML) 10 Page - Advanced Micro Devices

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Am29LV002
PR EL I M I NAR Y
Table 4.
Am29LV002 Autoselect Codes (High Voltage Method)
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both pro-
gram and erase operations in previously protected
sectors.
Sector protection/unprotection must be implemented
usin g programmin g equip ment. The procedure
requires a high voltage (VID) on address pin A9 and
OE#. Details on this method are provided in a supple-
ment, publication number 21224. Contact an AMD rep-
resentative to request a copy.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors 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 is protected
or unprotected. See “Autoselect Mode” for details.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to VID. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once VID is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 1 shows the algorithm, and
Figure 19 shows the timing waveforms, for this feature.
Figure 1.
Temporary Sector Unprotect Operation
Description
CE#
OE#
WE#
A17
to
A13
A12
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ7
to
DQ0
Manufacturer ID: AMD
L
L
H
X
X
VID
X
LXL
L
01h
Device ID: Am29LV002T
(Top Boot Block)
LL
H
X
X
VID
X
LXLH
40h
Device ID: Am29LV002B
(Bottom Boot Block)
LL
H
X
X
VID
X
LXLH
C2h
Sector Protection Verification
L
L
H
SA
X
VID
XL
X
H
L
01h
(protected)
00h
(unprotected)
START
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = VID
(Note 1)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
again.
21191C-4


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