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A800DB90PF 参数 Datasheet PDF下载

A800DB90PF图片预览
型号: A800DB90PF
PDF下载: 下载PDF文件 查看货源
内容描述: 8兆位( 1一M× 8位/ 512的K× 16位) CMOS 1.8伏只超低电压闪存 [8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory]
分类和应用: 闪存
文件页数/大小: 46 页 / 1066 K
品牌: AMD [ AMD ]
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D A T A S H E E T  
this time to ensure all commands are accepted. The  
time-out period and suspends the erase operation.  
Addresses are “don’t-cares” when writing the Erase  
Suspend command.  
interrupts can be re-enabled after the last Sector Erase  
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.  
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 can monitor DQ3 to determine if the sector  
erase timer has timed out. (See DQ3: Sector Erase  
Timer‚ on page 22.) The time-out begins from the rising  
edge of the final WE# pulse in the command sequence.  
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  
system can use DQ7, or DQ6 and DQ2 together, to  
determine if a sector is actively erasing or is erase-sus-  
pended. See Write Operation Status‚ on page 20 for  
information on these status bits.  
Once the sector erase operation has begun, only the  
Erase Suspend command is valid. All other commands  
are ignored. Note that a hardware 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.  
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, DQ2,  
or RY/BY#. (Refer to Write Operation Status‚ on  
page 20 for information 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‚ on page 20 for  
more information.  
Figure 4, on page 18 illustrates the algorithm for the  
erase operation. Refer to the Table 16 on page 39for  
parameters, and to Figure 18, on page 33 for timing  
diagrams.  
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‚  
on page 15 for more information.  
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 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  
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.  
January 23, 2007 27546A6  
Am29SL800D  
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