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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  
The DQ5 failure condition may appear if the system  
tries to program a “1” to a location that is previously pro-  
grammed to “0.Only an erase operation can change  
a “0” back to a “1.Under this condition, the device  
halts the operation, and when the operation has  
exceeded the timing limits, DQ5 produces a “1.”  
START  
Under both these conditions, the system must issue the  
reset command to return the device to reading array  
data.  
Read DQ7–DQ0  
Read DQ7–DQ0  
(Note 1)  
No  
DQ3: Sector Erase Timer  
After writing a sector erase command sequence, the  
system may read DQ3 to determine whether or not an  
erase operation has begun. (The sector erase timer  
does not apply to the chip erase command.) If addi-  
tional sectors are selected for erasure, the entire time-  
out also applies after each additional sector erase com-  
mand. When the time-out is complete, DQ3 switches  
from “0” to “1.The system may ignore DQ3 if the  
system can guarantee that the time between additional  
sector erase commands will always be less than 50 μs.  
See also the “Sector Erase Command Sequence”  
section.  
Toggle Bit  
= Toggle?  
Yes  
No  
D= 1?  
Yes  
After the sector erase command sequence is written,  
the system should read the status on DQ7 (Data#  
Polling) or DQ6 (Toggle Bit I) to ensure the device has  
accepted the command sequence, and then read DQ3.  
If DQ3 is “1”, the internally controlled erase cycle has  
begun; all further commands (other than Erase Sus-  
pend) are ignored until the erase operation is complete.  
If DQ3 is “0”, the device will accept additional sector  
erase commands. 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. Table 6 shows the oututs for DQ3.  
(Notes  
1, 2)  
Read DQ7–DQ0  
Twice  
Toggle Bit  
= Toggle?  
No  
Yes  
Program/Erase  
Operation Not  
Complete, Write  
Reset Command  
Program/Erase  
Operation Complete  
Notes:  
1. Read toggle bit twice to determine whether or not it is  
toggling. See text.  
2. Recheck toggle bit because it may stop toggling as DQꢀ  
changes to “1”. See text.  
Figure 5. Toggle Bit Algorithm  
November 17, 2009 21527D8  
Am29F002B/Am29F002NB  
19  
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