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參數(shù)資料
| 型號： | AM29LV200B-90REC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory |
| 中文描述： | 256K X 8 FLASH 3V PROM, 90 ns, PDSO48 |
| 封裝： | TSOP-48 |
| 文件頁數(shù)： | 10/37頁 |
| 文件大小： | 478K |
| 代理商： | AM29LV200B-90REC |
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Am29LV200
10
P R E L IM IN A R Y
Table 4.
Am29LV200 Autoselect Codes (High Voltage Method)
L = Logic Low = V
IL
, H = Logic High = V
IH
, 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 (V
ID
) 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 V
ID
. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once V
ID
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.
Description
Mode
CE#
OE#
WE#
A16
to
A12
A11
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ8
to
DQ15
DQ7
to
DQ0
Manufacturer ID
:
AMD
L
L
H
X
X
V
ID
X
L
X
L
L
X
01h
Device ID:
Am29LV200
(Top Boot Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
3Bh
Byte
L
L
H
X
3Bh
Device ID:
Am29LV200
(Bottom Boot
Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
BFh
Byte
L
L
H
X
BFh
Sector Protection Verification
L
L
H
SA
X
V
ID
X
L
X
H
L
X
01h
(protected)
X
00h
(unprotected)
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
again.
Figure 1.
Temporary Sector Unprotect Operation
20513D-5
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