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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  
Figure 6 illustrates the Sector Erase procedure.  
Suspend command can be written after the de-  
vice has resumed erasing.  
Erase Suspend/Erase Resume Commands  
The host may also write the Electronic ID com-  
mand sequence when the device is in the Erase  
Suspend mode. The device allows reading Elec-  
tronic ID codes even if the addresses used for the  
ID read cycles are within erasing sectors, since  
the codes are not stored in the memory array.  
When the device exits the Electronic ID mode, the  
device reverts to the Erase Suspend mode, and  
is ready for another valid operation. See Electronic  
ID section for more information.  
The Erase Suspend command allows the system  
to interrupt a sector erase operation to read data  
from, or program data in, any sector not being  
erased. The command causes the erase opera-  
tion to be suspended in all sectors selected for  
erasure. This command is valid only during the  
sector erase operation, including during the 50 µs  
time-out period at the end of the initial command  
sequence and any subsequent sector erase data  
cycles, and is ignored if it is issued during chip  
erase or programming operations.  
Electronic ID Command  
The HY29F002T requires a maximum of 20 µs to  
suspend the erase operation if the Erase Suspend  
command is issued during active sector erasure.  
However, if the command is written during the time-  
out, the time-out is terminated and the erase op-  
eration is suspended immediately. Any subse-  
quent attempts to specify additional sectors for  
erasure by writing the sector erase data cycle (SA/  
0x30) will be interpreted as the Erase Resume  
command (XXX/0x30), which will cause the Auto-  
matic Erase algorithm to begin its operation. Note  
that any other command during the time-out will  
reset the device to the Read mode.  
The Electronic ID operation intended for use in  
programming equipment has been described pre-  
viously. The host processor can also be obtain  
the same data by using the Electronic ID com-  
mand sequence shown in Table 5. This method  
does not require VID on any pin. The Electronic ID  
command sequence may be invoked while the  
device is in the Read mode or the Erase Suspend  
mode, but is invalid while the device is actively  
programming or erasing.  
The Electronic ID command sequence is initiated  
by writing two unlock cycles, followed by the Elec-  
tronic ID command. The device then enters the  
Electronic ID mode, and:  
Once the erase operation has been suspended,  
the system can read array data from or program  
data to any sector not selected for erasure. Nor-  
mal read and write timings and command defini-  
tions apply. Reading at any address within erase-  
suspended sectors produces status data on  
DQ[7:0]. The host can use DQ[7], or DQ[6] and  
DQ[2] together, to determine if a sector is actively  
erasing or is erase-suspended. See Write Op-  
eration Statusfor information on these status bits.  
n A read cycle at address 0xXXX00 retrieves the  
manufacturer code (Hynix = 0xAD).  
n A read cycle at address 0xXXX01 returns the  
device code (0xB0).  
n A read cycle containing a sector address in  
A[17:13] and the address 0x02 in A[7:0] returns  
0x01 if that sector is protected, or 0x00 if it is  
unprotected.  
After an erase-suspended program operation is  
complete, the host can initiate another program-  
ming operation (or read operation) within non-sus-  
pended sectors. The host can determine the sta-  
tus of a program operation during the erase-sus-  
pended state just as in the standard programming  
operation.  
The host system may read at any address any  
number of times, without initiating another com-  
mand sequence. Thus, for example, the host may  
determine the protection status for all sectors by  
doing successive reads at address 0x02 while  
changing the sector address in A[17:13] for each  
cycle.  
The system must write the Erase Resume com-  
mand to exit the Erase Suspend mode and con-  
tinue the sector erase operation. Further writes of  
the Resume command are ignored. Another Erase  
The system must write the Reset command to exit  
the Electronic ID mode and return to the Read  
mode, or to the Erase Suspend mode if the de-  
vice was in that mode when the command se-  
quence was issued.  
Rev. 4.1/May 01  
14