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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  
interrupts can be re-enabled after the last Sector Erase  
the Sector Erase Operations Timing diagram for timing  
command is written. If the time between additional  
sector erase commands can be assumed to be less  
than 50 µs, the system need not monitor DQ3. Any  
command other than Sector Erase or Erase  
Suspend during the time-out period resets the  
device to reading array data. The system must  
rewrite the command sequence and any additional  
sector addresses and commands.  
waveforms.  
START  
Write Erase  
The system can monitor DQ3 to determine if the sector  
erase timer has timed out. (See the “DQ3: Sector Erase  
Timer” section.) The time-out begins from the rising  
edge of the final WE# pulse in the command sequence.  
Command Sequence  
Data Poll  
Once the sector erase operation has begun, only the  
Erase Suspend command is valid. All other commands  
are ignored. On the Am29F002B only, note that a hard-  
ware reset during the sector erase operation  
immediately terminates the operation. The Sector  
Erase command sequence should be reinitiated once  
the device has returned to reading array data, to  
ensure data integrity.  
from System  
Embedded  
Erase  
algorithm  
in progress  
No  
Data = FFh?  
Yes  
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 using DQ7, DQ6, or  
DQ2. Refer to “Write Operation Status” for information  
on these status bits.  
Erasure Completed  
Notes:  
1. See the appropriate Command Definitions table for erase  
Figure 3 illustrates the algorithm for the erase opera-  
tion. Refer to the Erase/Program Operations tables in  
the “AC Characteristics” section for parameters, and to  
command sequence.  
2. See “DQ3: Sector Erase Timer” for more information.  
Figure 3. Erase Operation  
14  
Am29F002B/Am29F002NB  
21527D8 November 17, 2009  
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