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参数资料
| 型号： | AM29LV004B-90ED |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 512K X 8 FLASH 3V PROM, 90 ns, PDSO40 |
| 封装： | PLASTIC, TSOP-40 |
| 文件页数： | 2/36页 |
| 文件大小： | 459K |
| 代理商： | AM29LV004B-90ED |
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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
H
X
VID
XLXL
L
01h
Device ID: Am29LV004T
(Top Boot Block)
LL
H
X
VID
XLXL
H
B5h
Device ID: Am29LV004B
(Bottom Boot Block)
LL
H
X
VID
XLXL
H
B6h
Sector Protection Verification
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AM29LV004BB-120EC | 制造商:Advanced Micro Devices 功能描述:NOR Flash, 512K x 8, 40 Pin, Plastic, TSSOP |
| AM29LV004BB-120EI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Advanced Micro Devices 功能描述:NOR Flash, 512K x 8, 40 Pin, Plastic, TSSOP |
| AM29LV004BB120EI\T | 制造商:Advanced Micro Devices 功能描述:4 Mb (512K x 8) Boot Sector, Flash Memory |
| AM29LV004BB-120EIT | 制造商:Rochester Electronics LLC 功能描述: 制造商:Advanced Micro Devices 功能描述: |
| am29lv004bt-120ed | 制造商:Advanced Micro Devices 功能描述: |
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