M29W320EB データシートの表示（PDF） - Numonyx -> Micron

部品番号

コンポーネント説明

メーカー

M29W320EB

32Mbit (4Mbx8 or 2Mbx16, Uniform Parameter Blocks, Boot Block) 3V supply Flash memory

Numonyx -> Micron 

M29W320ET, M29W320EB

Command interface

4.3

Read CFI Query command

The Read CFI Query Command is used to read data from the Common Flash Interface

(CFI) memory Area. This command is valid when the device is in the Read Array mode, or

when the device is in Auto Select mode.

One Bus Write cycle is required to issue the Read CFI Query Command. Once the

command is issued subsequent Bus Read operations read from the Common Flash

Interface memory Area.

The Read/Reset command must be issued to return the device to the previous mode (the

Read Array mode or Auto Select mode). A second Read/Reset command would be needed

if the device is to be put in the Read Array mode from Auto Select mode.

See Appendix B: Common Flash Interface (CFI), Table 22, Table 23, Table 24, Table 25,

Table 26 and Table 27 for details on the information contained in the Common Flash

Interface (CFI) memory area.

4.4

Program command

The Program command can be used to program a value to one address in the memory array

at a time. The command requires four Bus Write operations, the final write operation latches

the address and data, and starts the Program/Erase Controller.

If the address falls in a protected block then the Program command is ignored, the data

remains unchanged. The Status register is never read and no error condition is given.

During the program operation the memory will ignore all commands. It is not possible to

issue any command to abort or pause the operation. After programming has started, Bus

Read operations output the Status register content. See Section 5: Status register for more

details. Typical program times are given in Table 6

After the program operation has completed the memory will return to the Read mode, unless

an error has occurred. When an error occurs Bus Read operations will continue to output

the Status register. A Read/Reset command must be issued to reset the error condition and

return to Read mode.

Note that the Program command cannot change a bit set at ’0’ back to ’1’. One of the Erase

Commands must be used to set all the bits in a block or in the whole memory from ’0’ to ’1’.

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