M29W640GH datasheet(27/90 Pages) NUMONYX

Part #	M29W640GH

Description	64 Mbit (8Mb x8 or 4Mb x16, Page) 3V supply Flash memory

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Manufacturer	NUMONYX [Numonyx B.V]

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M29W640GH, M29W640GL, M29W640GT, M29W640GB

Command Interface

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4.1.10

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.

Programming can be suspended and then resumed by issuing a Program Suspend

command and a Program Resume command, respectively (see Section 4.1.8: Program

Suspend command and Section 4.1.9: Program Resume command).

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. Typical program times are given in

Table 12: Program, Erase times and endurance cycles. Bus Read operations during the

program operation will output the Status Register on the Data Inputs/Outputs. See the

section on the Status Register for more details.

After the program 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.

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’.

Refer to Figure 6: Write Enable controlled Program waveforms (8-bit mode) and Figure 7:

Chip Enable controlled Program waveforms (8-bit mode) for a description of Program ac

waveforms.

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