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参数资料
| 型号： | AT49F002T-55PI |
| 厂商： | ATMEL CORP |
| 元件分类： | DRAM |
| 英文描述： | LM4858 Boomer ® Audio Power Amplifier Series Mono 1.5 W / Stereo 300mW Power Amplifier; Package: MINI SOIC; No of Pins: 10 |
| 中文描述： | 256K X 8 FLASH 5V PROM, 55 ns, PDIP32 |
| 封装： | 0.600 INCH, PLASTIC, DIP-32 |
| 文件页数： | 4/12页 |
| 文件大小： | 119K |
| 代理商： | AT49F002T-55PI |
AT49F002(N)T
4
Once the feature is enabled, the data in the boot block can
no longer be erased or programmed. Data in the main
memory block can still be changed through the regular pro-
gramming method. To activate the lockout feature, a series
of six program commands to specific addresses with spe-
cific data must be performed. Please refer to the Command
Definitions table.
BOOT BLOCK LOCKOUT DETECTION:
A software
method is available to determine if programming of the boot
block section is locked out. When the device is in the soft-
ware product identification mode (see Software Product
Identification Entry and Exit sections) a read from address
location 00002H will show if programming the boot block is
locked out. If the data on I/O0 is low, the boot block can be
programmed; if the data on I/O0 is high, the program lock-
out feature has been activated and the block cannot be
programmed. The software product identification code
should be used to return to standard operation.
BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE:
The user can override the boot block programming lockout
by taking the RESET pin to 12 volts. By doing this, pro-
tected boot block data can be altered through a chip erase,
sector erase or word programming. When the RESET pin is
brought back to TTL levels the boot block programming
lockout feature is again active. This feature is not available
on the AT49F002NT.
PRODUCT IDENTIFICATION:
The product identification
mode identifies the device and manufacturer as Atmel. It
may be accessed by hardware or software operation. The
hardware operation mode can be used by an external pro-
grammer to identify the correct programming algoithm for
the Atmel product.
For details, see Operating Modes (for hardware operation)
or Software Product Identification. The manufacturer and
device code is the same for both modes.
DATA POLLING:
The AT49F002(N)T features DATA poll-
ing to indicate the end of a program cycle. During a pro-
gram cycle an attempted read of the last byte loaded will
result in the complement of the loaded data on I/O7. Once
the program cycle has been completed, true data is valid
on all outputs and the next cycle may begin. DATA polling
may begin at any time during the program cycle.
TOGGLE BIT:
In addition to DATA polling the
AT49F002(N)T provides another method for determining
the end of a program or erase cycle. During a program or
erase operation, successive attempts to read data from the
device will result in I/O6 toggling between one and zero.
Once the program cycle has completed, I/O6 will stop tog-
gling and valid data will be read. Examining the toggle bit
may begin at any time during a program cycle.
HARDWARE DATA PROTECTION:
Hardware features
protect against inadvertent programs to the AT49F002(N)T
in the following ways: (a) V
CC
sense: if V
CC
is below 3.8V
(typical), the program function is inhibited. (b) Program
inhibit: holding any one of OE low, CE high or WE high
inhibits program cycles. (c) Noise filter: pulses of less than
15 ns (typical) on the WE or CE inputs will not initiate a pro-
gram cycle.
相关PDF资料 |
PDF描述 |
|---|---|
| AT49F002T-55TC | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F002T-55TI | 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F002T | 2-Megabit 5-volt Only CMOS Flash Memory(2M位 5V CMOS闪速存储器) |
| AT49F002 | 2-Megabit 256K x 8 5-volt Only Flash Memory |
| AT49F002A | 2-megabit (256K x 8) 5-volt Only Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT49F002T-55TC | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F002T-55TI | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
| AT49F002T-55VC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
| AT49F002T-55VI | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
| AT49F002T-70JC | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Megabit 256K x 8 5-volt Only CMOS Flash Memory |
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