M29W128 View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

Manufacturer

M29W128

128 Mbit 3V Supply Flash Memory

Numonyx -> Micron 

Command interface

M29W128FH, M29W128FL

5.1.6

5.1.7

5.1.8

Erase Suspend command

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

Block Erase operation. One Bus Write operation 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 15: Program, Erase Times and Program, Erase Endurance cycles) 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

no error condition is given. Reading from blocks that are being erased will output the Status

Register.

It is also possible to issue the Auto Select, Read CFI Query and Unlock Bypass commands

during an Erase Suspend. The Read/Reset command must be issued to return the device to

Read Array mode before the Resume command will be accepted.

During Erase Suspend a Bus Read operation to the Extended Memory Block will output the

Extended Memory Block data. Once in the Extended Block mode, the Exit Extended Block

command must be issued before the erase operation can be resumed.

Erase Resume command

The Erase Resume command is used to restart the Program/Erase Controller after an

Erase Suspend.

The device must be in Read Array mode before the Resume command will be accepted. An

Erase can be suspended and resumed more than once.

Program Suspend command

The Program Suspend command allows the system to interrupt a program operation so that

data can be read from any block. When the Program Suspend command is issued during a

program operation, the device suspends the program operation within the Program Suspend

Latency time (see Table 15: Program, Erase Times and Program, Erase Endurance cycles)

and updates the Status Register bits.

After the program operation has been suspended, the system can read array data from any

address. However, data read from Program-Suspended addresses is not valid.

The Program Suspend command may also be issued during a program operation while an

erase is suspended. In this case, data may be read from any addresses not in Erase

Suspend or Program Suspend. If a read is needed from the Extended Memory Block area

(One-time Program area), the user must use the proper command sequences to enter and

exit this region.

The system may also issue the Auto Select command sequence when the device is in the

Program Suspend mode. The system can read as many Auto Select codes as required.

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