- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366471 > AM29LV081-120EC (ADVANCED MICRO DEVICES INC) TV 79C 79#22D SKT PLUG PDF資料下載
參數(shù)資料
| 型號： | AM29LV081-120EC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | TV 79C 79#22D SKT PLUG |
| 中文描述： | 1M X 8 FLASH 3V PROM, 120 ns, PDSO40 |
| 封裝： | TSOP-40 |
| 文件頁數(shù)： | 10/35頁 |
| 文件大?。?/td> | 439K |
| 代理商： | AM29LV081-120EC |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁
10
Am29LV081
P R E L I M I N A R Y
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 (V
ID
) on address pin A9 and OE#. De-
tails on this method are provided in a supplement, pub-
lication number 21225. 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 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 19 shows the timing diagrams, for this feature.
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to Table 4 for com-
mand definitions). In addition, the following hardware
data protection measures prevent accidental erasure
or programming, which might otherwise be caused by
spurious 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 cy-
cle, 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.
Figure 1.
Temporary Sector Unprotect Operation
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.
20977C-4
相關PDF資料 |
PDF描述 |
|---|---|
| Am29LV081-120ECB | TV 79C 79#22D SKT PLUG |
| AM29LV081-120EE | TV 79C 79#22D SKT PLUG |
| AM29LV081-120EEB | TV 39C 37#20 2#16 PIN PLUG |
| AM29LV081-120EI | TV 39C 37#20 2#16 PIN PLUG REC |
| Am29LV081-120EIB | TV 39C 37#20 2#16 SKT PLUG REC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AM29LV081B-120ED | 制造商:Spansion 功能描述:IC SM FLASH 3V 8MB |
| AM29LV081B-120ED | 制造商:Spansion 功能描述:FLASH MEMORY IC |
| AM29LV081B-70EC | 制造商:Advanced Micro Devices 功能描述: 制造商:Atmel Corporation 功能描述: |
| AM29LV081B-70ED | 制造商:Spansion 功能描述:IC FLASH MEMORY PARALLEL 制造商:Advanced Micro Devices 功能描述:NOR Flash, 1M x 8, 40 Pin, Plastic, TSSOP |
| AM29LV081B-70ED | 制造商:Spansion 功能描述:Flash Memory IC |
發(fā)布緊急采購，3分鐘左右您將得到回復。