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ES29F320FT-70WC 参数 Datasheet PDF下载

ES29F320FT-70WC图片预览
型号: ES29F320FT-70WC
PDF下载: 下载PDF文件 查看货源
内容描述: 16兆( 2M ×8 / 1M ×16 )的CMOS 3.0伏只,引导扇区闪存 [16Mbit(2M x 8/1M x 16) CMOS 3.0 Volt-only, Boot Sector Flash Memory]
分类和应用: 闪存
文件页数/大小: 53 页 / 700 K
品牌: EXCELSEMI [ EXCEL SEMICONDUCTOR INC. ]
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E S I  
E S I  
Excel Semiconductor inc.  
reset immediately terminates the erase operation.If  
that occurs, the chip erase command sequence  
should be reinitiated once the device has returned to  
reading array data. to ensure data integrity. Fig. 7  
illustrates the algorithm for the erase operation.  
Refer to the Erase and Program Operations tables in  
the AC Characteristics section for parameters, and  
Fig. 21 section for timing diagrams.  
to the read mode. The system must rewrite the  
command sequence and any additional addresses  
and commands.  
Status Bits : DQ7,DQ6,DQ2, or RY/BY#  
When the Sector Erase Embedded Erase algorithm  
is complete, the device returns to reading array  
data and addresses are no longer latched. Note  
that while the Embedded Erase operation is in  
progress, the system can read data from the non-  
erasing sector. The system can determine the sta-  
tus of the erase operation by reading  
DQ7,DQ6,DQ2, or RY/BY# in the erasing sector.  
Refer to the Write Operation Status section Table  
10 for information on these status bits.  
SECTOR ERASE COMMAND  
By using a sector erase command, a single sector or  
multiple sectors can be erased. The sector erase  
command is a six bus cycle operation. The sector  
erase command sequence is initiated by writing two  
unlock cycles, followed by a set-up command. Two  
additional unlock cycles are written, and are then fol-  
lowed by the address of the sector to be erased, and  
the sector erase command. Table 9 shows the  
address and data requirements for the sector erase  
command sequence. Note that the autoselect, and  
CFI modes are unavailable while an erase operation  
is in progress.  
Valid Command during Sector Erase  
Once the sector erase operation has begun, only  
the Erase Suspend command is valid. All other  
commands are ignored. However, note that a hard-  
ware reset immediately terminates the erase oper-  
ation. If that occurs, the sector erase command  
Embedded Sector Erase Algorithm  
The device does not require the system to prepro-  
gram prior to erase. The Embedded Erase algorithm  
automatically programs and verifies the entire mem-  
ory for an all zero data pattern prior to electrical  
erase. The system is not required to provide any con-  
trols or timings these operations.  
START  
Write Erase  
Command Sequence  
(Notes 1,2)  
Sector Erase Time-out Window and DQ3  
Data Poll to  
Erasing Bank  
from System  
Embedded  
Erase  
algorithm in  
progress  
After the command sequence is written, a sector  
erase time-out of 50us occurs. During the time-out  
period, additional sector addresses and sector erase  
commands may be written. Loading the sector erase  
buffer may be done in any sequence, and the num-  
ber of sectors may be from one sector to all sectors.  
The time between these additional cycles must be  
less than 50 us, otherwise the last address and com-  
mand may not be accepted, and erasure may begin.  
It is recommended that processor interrupts be dis-  
abled during this time to ensure all commands are  
accepted. The interrupts can be re-enabled after the  
last Sector Erase command is written. The system  
can monitor DQ3 to determine if the sector erase  
timer has timed out (See the section on DQ3:Sector  
Erase Timer.). The time-out begins from the rising  
edge of the final WE# pulse in the command  
sequence.  
No  
No  
Data = FFh?  
Yes  
Erasure Completed  
Notes:  
1. See Table 9 for erase command sequence  
2. See the section on DQ3 for information on the sector erase timer  
Figure 7. Erase Operation  
Any command other than Sector Erase or Erase Sus-  
pend during the time-out period resets the device  
22  
Rev. 0B January 5 , 2006  
ES29LV160E  
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