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M29W320DB70ZE6 参数 Datasheet PDF下载

M29W320DB70ZE6图片预览
型号: M29W320DB70ZE6
PDF下载: 下载PDF文件 查看货源
内容描述: 32兆位( 4Mbx8或2Mbx16 ,非均匀参数块,引导块) 3V供应闪存 [32 Mbit (4Mbx8 or 2Mbx16, Non-uniform Parameter Blocks, Boot Block), 3V Supply Flash memory]
分类和应用: 闪存存储
文件页数/大小: 56 页 / 1058 K
品牌: NUMONYX [ NUMONYX B.V ]
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Command Interface  
M29W320DT, M29W320DB  
4.9  
Block Erase command  
The Block Erase command can be used to erase a list of one or more blocks. Six Bus Write  
operations are required to select the first block in the list. Each additional block in the list can  
be selected by repeating the sixth Bus Write operation using the address of the additional  
block. The Block Erase operation starts the Program/Erase Controller about 50µs after the  
last Bus Write operation. Once the Program/Erase Controller starts it is not possible to  
select any more blocks. Each additional block must therefore be selected within 50µs of the  
last block. The 50µs timer restarts when an additional block is selected. The Status Register  
can be read after the sixth Bus Write operation. See the Status Register section for details  
on how to identify if the Program/Erase Controller has started the Block Erase operation.  
If any selected blocks are protected then these are ignored and all the other selected blocks  
are erased. If all of the selected blocks are protected the Block Erase operation appears to  
start but will terminate within about 100µs, leaving the data unchanged. No error condition is  
given when protected blocks are ignored.  
During the Block Erase operation the memory will ignore all commands except the Erase  
Suspend command. Typical block erase times are given in Table 6. All Bus Read operations  
during the Block Erase operation will output the Status Register on the Data Inputs/Outputs.  
See the section on the Status Register for more details.  
After the Block Erase operation has completed the memory will return to the Read Mode,  
unless an error has occurred. When an error occurs the memory will continue to output the  
Status Register. A Read/Reset command must be issued to reset the error condition and  
return to Read mode.  
The Block Erase Command sets all of the bits in the unprotected selected blocks to ’1’. All  
previous data in the selected blocks is lost.  
4.10  
Erase Suspend command  
The Erase Suspend Command may be used to temporarily suspend a Block Erase  
operation and return the memory to Read mode. The command requires one Bus Write  
operation.  
The Program/Erase Controller will suspend within the Erase Suspend Latency Time (refer to  
Table 6 for value) of the Erase Suspend Command being issued. Once the Program/Erase  
Controller has stopped the memory will be set to Read mode and the Erase will be  
suspended. If the Erase Suspend command is issued during the period when the memory is  
waiting for an additional block (before the Program/Erase Controller starts) then the Erase is  
suspended immediately and will start immediately when the Erase Resume Command is  
issued. It is not possible to select any further blocks to erase after the Erase Resume.  
During Erase Suspend it is possible to Read and Program cells in blocks that are not being  
erased; both Read and Program operations behave as normal on these blocks. If any  
attempt is made to program in a protected block or in the suspended block then the Program  
command is ignored and the data remains unchanged. The Status Register is not read and  
no error condition is given. Reading from blocks that are being erased will output the Status  
Register.  
It is also possible to issue the Auto Select, Read CFI Query and Unlock Bypass commands  
during an Erase Suspend. The Read/Reset command must be issued to return the device to  
Read Array mode before the Resume command will be accepted.  
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