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HY29F002TT-55 参数 Datasheet PDF下载

HY29F002TT-55图片预览
型号: HY29F002TT-55
PDF下载: 下载PDF文件 查看货源
内容描述: 2兆位( 256K ×8 ) , 5伏只,闪存 [2 Megabit (256K x 8), 5 Volt-only, Flash Memory]
分类和应用: 闪存
文件页数/大小: 38 页 / 381 K
品牌: HYNIX [ HYNIX SEMICONDUCTOR ]
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HY29F002T  
may be loaded in any sequence, and the number  
of sectors specified may be from one sector to all  
sectors. The only restriction is that the time be-  
tween these additional data cycles must be less  
than 50 µs, otherwise erasure may begin before  
the last data cycle is accepted. To ensure that all  
data cycles are accepted, it is recommended that  
host processor interrupts be disabled during the  
time that the additional cycles are being issued  
and then be re-enabled afterwards.  
nores the command for the selected sectors that  
are protected.  
The system can monitor DQ[3] to determine if the  
50 µs sector erase time-out has expired, as de-  
scribed in the Write Operation Status section. If  
the time between additional sector erase data  
cycles can be insured to be less than the time-  
out, the system need not monitor DQ[3].  
Any command other than Sector Erase or Erase  
Suspend during the time-out period resets the  
device to reading array data. The system must  
then rewrite the command sequence, including any  
additional sector erase data cycles. Once the  
sector erase operation itself has begun, only the  
Erase Suspend command is valid. All other com-  
mands are ignored.  
Note: The device is capable of accepting three ways  
of invoking Erase Commands for additional sectors  
during the time-out window. The preferred method,  
described above, is the sector erase data cycle after  
the initial six bus cycle command sequence. How-  
ever, the device also accepts the following methods  
of specifying additional sectors during the sector  
erase time-out:  
n Repeat the entire six-cycle command sequence, speci-  
fying the additional sector in the sixth cycle.  
n Repeat the last three cycles of the six-cycle command  
sequence, specifying the additional sector in the third  
cycle.  
As for the Chip Erase command, note that a hard-  
ware reset immediately terminates the erase op-  
eration. To ensure data integrity, the aborted Sec-  
tor Erase command sequence should be reissued  
once the reset operation is complete.  
If all sectors scheduled for erasing are within pro-  
tected sectors, the device returns to reading ar-  
ray data after approximately 100 µs. If at least  
one selected sector is not protected, the erase  
operation erases the unprotected sectors, and ig-  
When the Automatic Erase algorithm terminates,  
the device returns to the Read mode. Several  
methods are provided to allow the host to deter-  
mine the status of the erase operation, as de-  
scribed in the Write Operation Status section.  
START  
Check Erase Status  
DQ[5] Error Exit  
(See Write Operation Status  
Section)  
Normal Exit  
Write First Five Cycles of  
SECTOR ERASE  
Command Sequence  
GO TO  
ERASE COMPLETE  
ERROR RECOVERY  
Setup First (or Next) Sector  
Address for Erase Operation  
Write Last Cycle (SA/0x30)  
of SECTOR ERASE  
Command Sequence  
Sectors which require erasure  
but which were not specified in  
this erase cycle must be erased  
later using a new command  
sequence  
NO  
Sector Erase  
Time-out (DQ[3])  
Expired?  
Erase An  
Additional Sector?  
YES  
YES  
NO  
Figure 6. Sector Erase Procedure  
Rev. 4.1/May 01  
13