M29W640GH datasheet(32/90 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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Command Interface

M29W640GH, M29W640GL, M29W640GT, M29W640GB

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The Write Buffer Programming Sequence can be aborted in the following ways:

●

Load a value that is greater than the page buffer size during the Number of Locations to

Program step.

●

Write to an address in a block different than the one specified during the Write-Buffer-

Load command.

●

Write an Address/Data pair to a different write-buffer-page than the one selected by the

Starting Address during the write buffer data loading stage of the operation.

●

Write data other than the Confirm Command after the specified number of data load

cycles.

The abort condition is indicated by DQ1 = 1, DQ7 = DATA# (for the last address location

loaded), DQ6 = toggle, and DQ5=0. A Write-to-Buffer-Abort Reset command sequence

must be written to reset the device for the next operation. Note that the full 3-cycle Write-to-

Buffer-Abort Reset command sequence is required when using Write-Buffer-Programming

features in Unlock Bypass mode.

See Appendix E: Flowchart, Figure 29: Write to Buffer and Program flowchart and pseudo

code, for a suggested flowchart on using the Write to Buffer and Program command.

4.2.10

Write to Buffer and Program Confirm command

The Write to Buffer and Program Confirm command is used to confirm a Write to Buffer and

Program command and to program the n+1 words loaded in the Write Buffer by this

command.

4.2.11

Write to Buffer and Program Abort and Reset command

The Write to Buffer and Program Abort and Reset command is used to reset the device after

a Write to Buffer and Program command has been aborted.

4.3

Block Protection commands

4.3.1

Enter Extended Block command

The device has an extra 256 byte block (Extended Block) that can only be accessed using

the Enter Extended Block command. Three Bus write cycles are required to issue the

Extended Block command. Once the command has been issued the device enters

Extended Block mode where all Bus Read or Write operations to the Boot Block addresses

access the Extended Block. The Extended Block (with the same address as the Boot

Blocks) cannot be erased, and can be treated as one-time programmable (OTP) memory. In

Extended Block mode the Boot Blocks are not accessible.

To exit from the Extended Block mode the Exit Extended Block command must be issued.

The Extended Block can be protected, however once protected the protection cannot be

undone.

4.3.2

Exit Extended Block command

The Exit Extended Block command is used to exit from the Extended Block mode and return

the device to Read mode. Four Bus Write operations are required to issue the command.

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