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參數(shù)資料
| 型號： | AM29LV640MU25PCI |
| 廠商： | Advanced Micro Devices, Inc. |
| 元件分類： | FLASH |
| 英文描述： | 64 Megabit (4 M x 16-Bit) MirrorBita?? 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/Oa?? Control |
| 中文描述： | 64Mb(4個(gè)M x 16位)的MirrorBit，3V，統(tǒng)一扇區(qū)閃存并有Versatile輸入/輸出控制 |
| 文件頁數(shù)： | 32/59頁 |
| 文件大?。?/td> | 699K |
| 代理商： | AM29LV640MU25PCI |
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30
Am29LV640MU
25301C5 February1,2007
D A T A S H E E T
When the Embedded Erase algorithm is complete, the
device returns to reading array data and addresses
are no longer latched. The system can determine the
status of the erase operation by reading DQ7, DQ6,
DQ2, or RY/BY# in the erasing sector. Refer to the
Write Operation Status
section for information on
these status bits.
Once the sector erase operation has begun, only the
Erase Suspend command is valid. All other com-
mands are ignored. However, note that a
hardware
reset
immediately
terminates the erase operation. If
that occurs, the sector erase command sequence
should be reinitiated once the device has returned to
reading array data, to ensure data integrity.
Figure 6 illustrates the algorithm for the erase opera-
tion. Refer to the
Erase and Program Operations
ta-
bles in the AC Characteristics section for parameters,
and Figure 18 section for timing diagrams.
Erase Suspend/Erase Resume
Commands
The Erase Suspend command, B0h, allows the sys-
tem to interrupt a sector erase operation and then read
data from, or program data to, any sector not selected
for erasure. This command is valid only during the sec-
tor erase operation, including the 50 μs time-out pe-
riod during the sector erase command sequence. The
Erase Suspend command is ignored if written during
the chip erase operation or Embedded Program
algorithm.
When the Erase Suspend command is written during
the sector erase operation, the device requires a typi-
cal of 5 μs (maximum 20 μs) to suspend the erase op-
eration. However, when the Erase Suspend command
is written during the sector erase time-out, the device
immediately terminates the time-out period and sus-
pends the erase operation.
After the erase operation has been suspended, the
device enters the erase-suspend-read mode. The sys-
tem can read data from or program data to any sector
not selected for erasure. (The device “erase sus-
pends” all sectors selected for erasure.) Reading at
any address within erase-suspended sectors pro-
duces status information on DQ7–DQ0. The system
can use DQ7, or DQ6 and DQ2 together, to determine
if a sector is actively erasing or is erase-suspended.
Refer to the
Write Operation Status
section for infor-
mation on these status bits.
After an erase-suspended program operation is com-
plete, the device returns to the erase-suspend-read
mode. The system can determine the status of the
program operation using the DQ7 or DQ6 status bits,
just as in the standard word program operation.
Refer to the
Write Operation Status
section for more
information.
In the erase-suspend-read mode, the system can also
issue the autoselect command sequence. Refer to the
Autoselect Mode
and
Autoselect Command Sequence
sections for details.
To resume the sector erase operation, the system
must write the Erase Resume command. Further
writes of the Resume command are ignored. Another
Erase Suspend command can be written after the chip
has resumed erasing.
Note: During an erase operation, this flash device per-
forms multiple internal operations which are invisible
to the system. When an erase operation is suspended,
any of the internal operations that were not fully com-
pleted must be restarted. As such, if this flash device
is continually issued suspend/resume commands in
rapid succession, erase progress will be impeded as a
function of the number of suspends. The result will be
a longer cumulative erase time than without suspends.
Note that the additional suspends do not affect device
reliability or future performance. In most systems rapid
erase/suspend activity occurs only briefly. In such
cases, erase performance will not be significantly im-
pacted.
Figure 7.
Erase Operation
START
Write Erase
Command Sequence
(Notes 1, 2)
Data Poll to Erasing
Bank from System
Data = FFh
No
Yes
Erasure Completed
Embedded
Erase
algorithm
in progress
Notes:
1. See
Table 10
for erase command sequence.
2. See the section on DQ3 for information on the sector
erase timer.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| AM29LV640MU90NI | 制造商:Advanced Micro Devices 功能描述: |
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| AM29LV640MU90RPCI | 制造商:Advanced Micro Devices 功能描述: |
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