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參數(shù)資料
| 型號： | AM29BL802CB-70R |
| 廠商： | Spansion Inc. |
| 英文描述： | 8 Megabit (512 K x 16-Bit) CMOS 3.0 Volt-only Burst Mode Flash Memory |
| 中文描述： | 8兆位（512畝× 16位）的CMOS 3.0伏特，只有突發(fā)模式閃存 |
| 文件頁數(shù)： | 21/46頁 |
| 文件大?。?/td> | 466K |
| 代理商： | AM29BL802CB-70R |
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November 3, 2006 22371C7
Am29BL802C
19
D A T A S H E E T
device from entering Burst Mode. To enter Burst Mode
either the Erase operation must be allowed to complete
normally, or it can be prematurely terminated by issuing
a Hardware Reset.
Burst Mode
While in Burst Mode the Erase Suspend command is
ignored and the device continues to operate normally in
Burst Mode. If Erase Suspend operation is required,
then Burst Mode must be terminated and Asynchro-
nous Mode initiated.
General
This command is valid only during the sector erase op-
eration, including the 50 μs time-out period during the
sector erase command sequence. The Erase Suspend
command is ignored if written during the chip erase op-
eration or Embedded Program algorithm. Writing the
Erase Suspend command during the Sector Erase
time-out immediately terminates the time-out period
and suspends the erase operation. Addresses are
“don’t-cares” when writing the Erase Suspend com-
mand.
When the Erase Suspend command is written during a
sector erase operation, the device requires a maximum
of 20 μs to suspend the erase operation. However, when
the Erase Suspend command is written during the sec-
tor erase time-out, the device immediately terminates
the time-out period and suspends the erase operation.
After the erase operation has been suspended, the
system can read array data from or program data to
any sector not selected for erasure. (The device “erase
suspends” all sectors selected for erasure.) Normal
read and write timings and command definitions apply.
Note that burst read is not available when the device is
erase-suspended. Only asynchronous reads are al-
lowed.
Reading at any address within erase-sus-
pended sectors produces status data 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. See “Write Operation Status” for informa-
tion on these status bits.
After an erase-suspended program operation is com-
plete, the system can once again read array data within
non-suspended sectors. The system can determine
the status of the program operation using the DQ7 or
DQ6 status bits, just as in the standard program oper-
ation. See “Write Operation Status” for more informa-
tion.
The system may also write the autoselect command
sequence when the device is in the Erase Suspend
mode. The device allows reading autoselect codes
even at addresses within erasing sectors, since the
codes are not stored in the memory array. When the
device exits the autoselect mode, the device reverts to
the Erase Suspend mode, and is ready for another
valid operation. See “Autoselect Command Sequence”
for more information.
The system must write the Erase Resume command
(address bits are “don’t care”) to exit the erase suspend
mode and continue the sector erase operation. Further
writes of the Resume command are ignored. Another
Erase Suspend command can be written after the de-
vice has resumed erasing.
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