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A29002TL-70 参数 Datasheet PDF下载

A29002TL-70图片预览
型号: A29002TL-70
PDF下载: 下载PDF文件 查看货源
内容描述: 256K ×8位CMOS 5.0伏只,引导扇区闪存 [256K X 8 Bit CMOS 5.0 Volt-only, Boot Sector Flash Memory]
分类和应用: 闪存
文件页数/大小: 32 页 / 314 K
品牌: AMICC [ AMIC TECHNOLOGY ]
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A29002/A290021 Series  
Figure 3 illustrates the algorithm for the erase operation.  
Refer to the Erase/Program Operations tables in the "AC  
Characteristics" section for parameters, and to the Sector  
Erase Operations Timing diagram for timing waveforms.  
START  
Erase Suspend/Erase Resume Commands  
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  
50ms 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  
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 command.  
When the Erase Suspend command is written during a  
sector erase operation, the device requires a maximum of  
20ms to suspend the erase operation. However, when the  
Erase Suspend command is written during the sector erase  
time-out, the device immediately terminates the time-out  
period and suspends the erase operation.  
Write Erase  
Command  
Sequence  
Data Poll  
from System  
Embedded  
Erase  
algorithm in  
progress  
No  
Data = FFh ?  
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 I/O7  
- I/O0. The system can use I/O7, or I/O6 and I/O2 together, to  
determine if a sector is actively erasing or is erase-  
suspended. See "Write Operation Status" for information on  
these status bits.  
After an erase-suspended program operation is complete,  
the system can once again read array data within non-  
suspended sectors. The system can determine the status of  
the program operation using the I/O7 or I/O6 status bits, just  
as in the standard program operation. See "Write Operation  
Status" for more information.  
Yes  
Erasure Completed  
Note :  
1. See the appropriate Command Definitions table for erase  
command sequences.  
2. See "I/O3 : Sector Erase Timer" for more information.  
Figure 3. Erase Operation  
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 device has  
resumed erasing.  
(February, 2002, Version 1.0)  
10  
AMIC Technology, Inc.  
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