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AM29LV004T-100FEB Fiches technique(PDF) 10 Page - Advanced Micro Devices

No de pièce AM29LV004T-100FEB
Description  4 Megabit (512 K x 8-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
Download  36 Pages
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Fabricant  AMD [Advanced Micro Devices]
Site Internet  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29LV004T-100FEB Fiches technique(HTML) 10 Page - Advanced Micro Devices

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10
Am29LV004
PR EL I M I NAR Y
Table 4.
Am29LV004 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.
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.
Sector protection/unprotection must be implemented
using programming equipment.The procedure requires
a high voltage (VID) on address pin A9 and OE#. De-
tails on this method are provided in a supplement, pub-
lication number 20874. Contact an AMD representative
to request a copy.
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 diagrams, for this feature.
Description
CE#
OE#
WE#
A18
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
XLXL
L
01h
Device ID: Am29LV004T
(Top Boot Block)
LL
H
X
X
VID
XLXL
H
B5h
Device ID: Am29LV004B
(Bottom Boot Block)
LL
H
X
X
VID
XLXL
H
B6h
Sector Protection Verification
L
L
H
SA
X
VID
XLX
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.
Figure 1.
Temporary Sector Unprotect Operation
21522A-4


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