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AM29LV200 View Datasheet(PDF) - Advanced Micro Devices

Part NameDescriptionManufacturer
AM29LV200 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 3.0 volt-only boot sector flash memory AMD
Advanced Micro Devices AMD
AM29LV200 Datasheet PDF : 37 Pages
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PRELIMINARY
Table 4. Am29LV200 Autoselect Codes (High Voltage Method)
Description
A16 A11
A8
A5
DQ8
to to
to
to
to
Mode CE# OE# WE# A12 A10 A9 A7 A6 A2 A1 A0 DQ15
DQ7
to
DQ0
Manufacturer ID: AMD
L
L
H X X VID X L X L L
X
01h
Device ID:
Word L
L
H
22h
3Bh
Am29LV200
X X VID X L X L H
(Top Boot Block)
Byte L
LH
X
3Bh
Device ID:
Am29LV200
(Bottom Boot
Block)
Word L
L
H
22h
BFh
X X VID X L X L H
Byte L
L
H
X
BFh
Sector Protection Verification L
L
H SA X VID X L X H L
X
01h
(protected)
X
00h
(unprotected)
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
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 21226. Contact an AMD representative
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 21 shows the timing diagrams, for this feature.
START
RESET# = VID
(Note 1)
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Unprotect Completed
(Note 2)
Notes:
20513D-5
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
again.
Figure 1. Temporary Sector Unprotect Operation
Am29LV200
10
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