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參數(shù)資料
| 型號： | AM29F002NT-120EE |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory |
| 中文描述： | 256K X 8 FLASH 5V PROM, 120 ns, PDSO32 |
| 封裝： | TSOP-32 |
| 文件頁數(shù)： | 10/37頁 |
| 文件大?。?/td> | 436K |
| 代理商： | AM29F002NT-120EE |
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10
Am29F002/Am29F002N
P R E L IM IN A R Y
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
Note:
This feature requites the RESET# pin and is
therefore not available on the Am29F002N.
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
shows the timing waveforms, for this feature.
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-
gramming, which might otherwise be caused by spuri-
ous system level signals during V
CC
power-up and
power-down transitions, or from system noise.
Low V
CC
Write Inhibit
When V
CC
is less than V
LKO
, the device does not ac-
cept any write cycles. This protects data during V
CC
power-up and power-down. The command register and
all internal program/erase circuits are disabled, and the
device resets. Subsequent writes are ignored until V
CC
is greater than V
LKO
. The system must provide the
proper signals to the control pins to prevent uninten-
tional writes when V
CC
is greater than V
LKO
.
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE# or
WE# do not initiate a write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# =
V
IL
, CE# = V
IH
or WE# = V
IH
. To initiate a write cycle,
CE# and WE# must be a logical zero while OE# is a
logical one.
Power-Up Write Inhibit
If WE# = CE# = V
IL
and OE# = V
IH
during power up, the
device does not accept commands on the rising edge
of WE#. The internal state machine is automatically
reset to reading array data on power-up.
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.
20818C-4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| Am29F002NT-120EEB | 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory |
| AM29F002NT-120EI | 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory |
| Am29F002NT-120EIB | 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory |
| AM29F002NT-120JC | 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory |
| Am29F002NT-120JCB | 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM29F002NT-90EC | 制造商:Advanced Micro Devices 功能描述:256K X 8 FLASH 5V PROM, 90 ns, PDSO32 |
| AM29F002T-120JI | 制造商:Advanced Micro Devices 功能描述:NOR Flash, 256K x 8, 32 Pin, Plastic, PLCC |
| AM29F002T-55JC | 制造商:Advanced Micro Devices 功能描述: 制造商:Advanced Micro Devices 功能描述:256K X 8 FLASH 5V PROM, 55 ns, PQCC32 |
| AM29F004BB-55JI | 制造商:Advanced Micro Devices 功能描述:Flash Mem Parallel 5V 4M-Bit 512K x 8 55ns 32-Pin PLCC |
| AM29F010 | 制造商:Panasonic Industrial Company 功能描述:IC |
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