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AM29F002BB-90EK 参数 Datasheet PDF下载

AM29F002BB-90EK图片预览
型号: AM29F002BB-90EK
PDF下载: 下载PDF文件 查看货源
内容描述: [Flash, 256KX8, 90ns, PDSO32, LEAD FREE, MO-142BBD, TSOP-32]
分类和应用: 光电二极管内存集成电路
文件页数/大小: 40 页 / 1039 K
品牌: CYPRESS [ CYPRESS ]
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D A T A S H E E T  
system can use DQ7, or DQ6 and DQ2 together, to  
Erase Suspend/Erase Resume Commands  
determine if a sector is actively erasing or is erase-sus-  
pended. See “Write Operation Status” for information  
on these status bits.  
The Erase Suspend command allows the system 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 sector  
erase operation, 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 operation or Embedded Program algo-  
rithm. 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 command.  
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  
information.  
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.  
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 sector erase time-out, the device immediately ter-  
minates the time-out period and suspends the erase  
operation.  
The system must rite 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  
deve has resumed erasing.  
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.  
Reading at any address within erase-suspended  
sectors produces status data on DQ7–DQ0. The  
November 17, 2009 21527D8  
Am29F002B/Am29F002NB  
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