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参数资料
| 型号： | Am29F200AB-55SIB |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory |
| 中文描述： | 2兆位（256亩x 8-Bit/128亩x 16位），5.0伏的CMOS只，引导扇区闪存 |
| 文件页数： | 11/39页 |
| 文件大小： | 237K |
| 代理商： | AM29F200AB-55SIB |
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Am29F200A
11
P R E L I M I N A R Y
Table 4.
Am29F200A 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
hardware sector unprotection feature re-enables
both program and erase operations in previously pro-
tected sectors.
Sector protection/unprotection must be implemented
using programming equipment. The procedure re-
quires a high voltage (V
ID
) on address pin A9 and the
control pins. Details on this method are provided in a
supplement, publication number 20551. Contact an
AMD representative to obtain a copy of the appropriate
document.
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
RESET# pin to V
ID
. During this mode, formerly pro-
tected sectors can be programmed or erased by se-
lecting the sector addresses. Once V
ID
is removed
from the RESET# pin, all the previously protected
sectors are protected again. Figure 1 shows the algo-
rithm, and the Temporary Sector Unprotect diagram
(Figure 18) shows the timing waveforms, for this fea-
ture.
Figure 1.
Temporary Sector Unprotect Operation
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to the Command Defi-
nitions table). In addition, the following hardware data
protection measures prevent accidental erasure or pro-
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:
Am29F200A
(Top Boot Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
51h
Byte
L
L
H
X
51h
Device ID:
Am29F200A
(Bottom Boot Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
57h
Byte
L
L
H
X
57h
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.
20637B-6
相关PDF资料 |
PDF描述 |
|---|---|
| AM29F200AB-70EC | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory |
| Am29F200AB-70ECB | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory |
| AM29F200AB-70EE | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory |
| Am29F200AB-70EEB | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory |
| AM29F200AB-70EI | 2 Megabit (256 K x 8-Bit/128 K x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AM29F200AB-90SC | 制造商:Advanced Micro Devices 功能描述:NOR Flash, 128K x 16, 44 Pin, Plastic, SOP |
| AM29F200AB90SI | 制造商:AMD 功能描述:NEW |
| AM29F200AT-120EC | 制造商:Advanced Micro Devices 功能描述:NOR Flash Parallel 5V 2Mbit 256K/128K x 8bit/16bit 120ns 48-Pin TSOP |
| AM29F200AT55EC | 制造商:Advanced Micro Devices 功能描述: |
| AM29F200AT70SI | 制造商:AMD 功能描述:* |
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