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參數資料
| 型號： | AM29F040B-150PE |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory |
| 中文描述： | 512K X 8 FLASH 5V PROM, 150 ns, PDIP32 |
| 封裝： | PLASTIC, MO-015AP, DIP-32 |
| 文件頁數： | 5/38頁 |
| 文件大?。?/td> | 1127K |
| 代理商： | AM29F040B-150PE |
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July 18, 2005
Am29F040B
11
COMMAND DEFINITIONS
Writing specific address and data commands or se-
quences into the command register initiates device
operations. The Command Definitions table defines the
valid register command sequences. Writing incorrect
address and data values or writing them in the im-
proper sequence resets the device to reading array
data.
All addresses are latched on the falling edge of WE# or
CE#, whichever happens later. All data is latched on
the rising edge of WE# or CE#, whichever happens
first. Refer to the appropriate timing diagrams in the
“AC Characteristics” section.
Reading Array Data
The device is automatically set to reading array data
after device power-up. No commands are required to
retrieve data. The device is also ready to read array
data after completing an Embedded Program or Em-
bedded Erase algorithm.
After the device accepts an Erase Suspend command,
the device enters the Erase Suspend mode. The sys-
tem can read array data using the standard read
timings, except that if it reads at an address within
erase-suspended sectors, the device outputs status
data. After completing a programming operation in the
Erase Suspend mode, the system may once again
read array data with the same exception. See “Erase
Suspend/Erase Resume Commands” for more infor-
mation on this mode.
The system must issue the reset command to re-en-
able the device for reading array data if DQ5 goes high,
or while in the autoselect mode. See the “Reset Com-
mand” section, next.
See also “Requirements for Reading Array Data” in the
“Device Bus Operations” section for more information.
The Read Operations table provides the read parame-
ters, and Read Operation Timings diagram shows the
timing diagram.
Reset Command
Writing the reset command to the device resets the de-
vice to reading array data. Address bits are don’t care
for this command.
The reset command may be written between the se-
quence cycles in an erase command sequence before
erasing begins. This resets the device to reading array
data. Once erasure begins, however, the device ig-
nores reset commands until the operation is complete.
The reset command may be written between the se-
quence cycles in a program command sequence
before programming begins. This resets the device to
reading array data (also applies to programming in
Erase Suspend mode). Once programming begins,
however, the device ignores reset commands until the
operation is complete.
The reset command may be written between the se-
quence cycles in an autoselect command sequence.
Once in the autoselect mode, the reset command must
be written to return to reading array data (also applies
to autoselect during Erase Suspend).
If DQ5 goes high during a program or erase operation,
writing the reset command returns the device to read-
ing array data (also applies during Erase Suspend).
Autoselect Command Sequence
The autoselect command sequence allows the host
system to access the manufacturer and devices codes,
and determine whether or not a sector is protected.
The Command Definitions table shows the address
and data requirements. This method is an alternative to
that shown in the Autoselect Codes (High Voltage
Method) table, which is intended for PROM program-
mers and requires VID on address bit A9.
The autoselect command sequence is initiated by writ-
ing two unlock cycles, followed by the autoselect
command. The device then enters the autoselect
mode, and the system may read at any address any
number of times, without initiating another command
sequence.
A read cycle at address XX00h or retrieves the manu-
facturer code. A read cycle at address XX01h returns
the device code. A read cycle containing a sector ad-
dress (SA) and the address 02h in returns 01h if that
sector is protected, or 00h if it is unprotected. Refer to
the Sector Address tables for valid sector addresses.
The system must write the reset command to exit the
autoselect mode and return to reading array data.
Byte Program Command Sequence
Programming is a four-bus-cycle operation. The pro-
gram command sequence is initiated by writing two
unlock write cycles, followed by the program set-up
command. The program address and data are written
next, which in turn initiate the Embedded Program al-
gorithm. The system is not required to provide further
controls or timings. The device automatically provides
internally generated program pulses and verify the pro-
grammed cell margin. The Command Definitions take
shows the address and data requirements for the byte
program command sequence.
When the Embedded Program algorithm is complete,
the device then returns to reading array data and ad-
dresses are no longer latched. The system can
determine the status of the program operation by using
DQ7 or DQ6. See “Write Operation Status” for informa-
tion on these status bits.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AM29F040B-55EC | 制造商:Advanced Micro Devices 功能描述:NOR Flash, 512K x 8, 32 Pin, Plastic, TSSOP |
| AM29F040B-55ED | 制造商:Spansion 功能描述:IC FLASH 4MB SMD 29F040 TSOP32 |
| AM29F040B-55EE | 制造商:Spansion 功能描述:NOR Flash Parallel 5V 4Mbit 512K x 8bit 55ns 32-Pin TSOP |
| AM29F040B-55EF | 功能描述:閃存 4M (512Kx8) 55ns 5v Parallel NOR 閃存 RoHS:否 制造商:ON Semiconductor 數據總線寬度:1 bit 存儲類型:Flash 存儲容量:2 MB 結構:256 K x 8 定時類型: 接口類型:SPI 訪問時間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
| AM29F040B-55EI | 制造商:Spansion 功能描述:NOR Flash Parallel 5V 4Mbit 512K x 8bit 55ns 32-Pin TSOP |
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