M29DW641F datasheet(29/80 Pages) NUMONYX

Part #	M29DW641F

Description	64 Mbit (4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory

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Manufacturer	NUMONYX [Numonyx B.V]

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M29DW641F

Command interface

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Further issuing of the Resume command is ignored. Another Program Suspend command

can be written after the device has resumed programming.

6.1.10

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 in the internal state machine 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 6.1.8: Program

Suspend command and Section 6.1.9: 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.

After programming has started, Bus Read Operations in the Bank being programmed output

the Status Register content, while Bus Read Operations to the other Bank output the

contents of the memory array. See the section on the Status Register for more details.

Typical program times are given in

Table 12.

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 to the Bank

where the command was issued will continue to output the Status Register. A Read/Reset

command must be issued to reset the error condition and return to Read mode.

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’.

6.1.11

Verify command

The Verify command is used to check if a block is blank or in other words, if it has been

successfully erased and all its bits set to ’1’. It reads the value of the Error bit DQ5. If the

Error bit is set to ’1’, it indicates that the operation failed.

Three cycles are required to issue a Verify command:

1.

The command starts with two unlock cycles.

2.

The third Bus Write cycle sets up the Verify command code along with the address of

the block to be checked.

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Manufacturer	Part #	Datasheet	Description
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