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ES29DS800E-90RTG 参数 Datasheet PDF下载

ES29DS800E-90RTG图片预览
型号: ES29DS800E-90RTG
PDF下载: 下载PDF文件 查看货源
内容描述: 的8Mbit ( 1M ×8 / 512K ×16 )的CMOS 3.0伏只,引导扇区闪存 [8Mbit(1M x 8/512K x 16) CMOS 3.0 Volt-only, Boot Sector Flash Memory]
分类和应用: 闪存
文件页数/大小: 50 页 / 680 K
品牌: EXCELSEMI [ EXCEL SEMICONDUCTOR INC. ]
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time-out also applies after each additional sector  
erase command. When the time-out period is com-  
plete, DQ3 switches from a “0” to a”1”. If the time  
between additional sector erase commands from the  
system can be assumed to be less than 50us, the  
system need not monitor DQ3. See also the Sector  
Erase Command Sequence section. After the sector  
erase command is written, the system should read  
the status of DQ7 (Data# Polling) or DQ6 (Toggle Bit  
I) to ensure that the device has accepted the com-  
mand sequence, and then read DQ3. If DQ3 is “1”,  
the Embedded Erase algorithm has begun; all fur-  
ther commands (except Erase Suspend) are ignored  
until the erasure operation is complete. If DQ3 is “0”,  
the device will accept additional sector erase com-  
mands. To ensure the command has been accepted,  
the system software should check the status of DQ3  
prior to and following each subsequent sector erase  
command. If DQ3 is high on the second status  
check, the last command might not have been  
accepted. In Table 6, DQ3 status operation is well  
defined and summarized with other status bits, DQ7,  
DQ6, DQ5, and DQ2.  
DQ5 ( EXCEEDED TIMING LIMITS )  
DQ5 indicates whether the program or erase time  
has exceeded a specified internal pulse count limit.  
Under these conditions DQ5 produces a “1”, indi-  
cating that the program or erase cycle was not suc-  
cessfully completed. The device may output a “1”  
on DQ5 if the system tries to program a “1” to a  
location that was previously programmed to “0”  
Only an erase operation can change a “0” back to a  
“1”. Under this condition, the device halts the opera-  
tion, and when the timing limit has been exceeded,  
DQ5 produces a ”1”. Under both these conditions,  
the system must write the reset command to return  
to the read mode.  
DQ3 ( SECTOR ERASE TIMER )  
After writing a sector erase command sequence,  
the system may read DQ3 to determine whether or  
not erasure has begun. (The sector erase time  
does not apply to the chip erase command.) If addi-  
tional sectors are selected for erasure, the entire  
Table 6. Write Operation Status  
DQ7  
DQ5  
(Note 1)  
DQ3  
DQ2  
(Note 2)  
RY/  
BY#  
Status  
DQ6  
(Note 2)  
DQ7#  
0
Embedded Program Algorithm  
Embedded Erase Algorithm  
Toggle  
Toggle  
0
0
N/A  
No toggle  
0
0
Standard  
Mode  
1
Toggle  
Toggle  
Erase Suspended  
Sector  
1
No toggle  
0
N/A  
1
Erase-Suspend-  
Read  
Erase Sus-  
pend Mode  
Non-Erase  
Suspended Sector  
Data  
Data  
Data  
0
Data  
N/A  
Data  
N/A  
1
0
Erase-Suspend-Program  
DQ7#  
Toggle  
Notes :  
1. DQ5 switches to “1” when an Embedded Program or Embedded Erase operation has exceeded the maximum timing limits. Refer to the  
section on DQ5 for more information.  
2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further details.  
25  
Rev. 1D January 5, 2006  
ES29LV800D  
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