M29DW641F datasheet(27/80 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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6.1.5

Block Erase command

The Block Erase command can be used to erase a list of one or more blocks in one or more

Banks. It sets all of the bits in the unprotected selected blocks to ’1’. All previous data in the

selected blocks is lost.

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 after a time-out period of 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. After the sixth Bus Write Operation a Bus Read Operation

within the same Bank will output the Status Register. 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 and the Read/Reset command which is only accepted during the 50µs

time-out period. Typical block erase times are given in

Table 12.

After the Erase Operation has started all Bus Read Operations to the Banks being erased

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, Bus Read Operations to the Banks 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.

6.1.6

Erase Suspend command

The Erase Suspend command may be used to temporarily suspend a Block or multiple

Block Erase Operation. One Bus Write Operation specifying the Bank Address of one of the

Blocks being erased is required to issue the command. Issuing the Erase Suspend

command returns the whole device to Read mode.

The Program/Erase Controller will suspend within the Erase Suspend Latency time (see

Table 12 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

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