M58PR256J datasheet(34/114 Pages) STMICROELECTRONICS

34 / 114 page

Command interface

M58PR256J, M58PR512J

34/114

4.25

Suspend EFA Block command

The Suspend EFA Block command is used to pause a Program or Erase EFA Block

operation. The command can be addressed to any bank.

The Resume EFA Block command is required to restart the suspended operation.

One bus write cycle is required to issue the Suspend EFA Block command. Once the

Program/Erase Controller has paused bits SR7, SR6 and/ or SR2 of the Status Register will

be set to '1'.

The following commands are accepted during Suspend EFA Block:

–

Resume EFA Block

–

Read Array

–

Read EFA Block (data from Erase-Suspended Blocks or Program-Suspended

Words is not valid)

–

Read Status Register

–

Read Electronic Signature

–

Read CFI Query.

Additionally, if the suspended operation was an Erase EFA Block operation then the

following commands are also accepted:

–

Clear Status Register

–

Program EFA Block (except in the Erase-Suspended Block)

–

Program and Buffer Program in the main array

–

Block Lock

–

Block Lock-Down

–

Block Unlock

–

EFA Block Lock

–

EFA Block Lock-Down

–

EFA Block Unlock

During Suspend EFA Block the EFA Block being erased can be protected by issuing the

EFA Block Lock or EFA Block Lock-Down commands. When the Resume EFA Block

command is issued the operation is resumed and completes. The Suspend EFA Block

operation can be repeated.

For example, it is possible to suspend an Erase EFA Block operation, to start a Program

EFA Block operation, to suspend the program operation, then read EFA locations...

If a Program EFA Block command is issued during a Suspend EFA Block operation, the

Erase EFA Block operation cannot be resumed until the program operation has completed.

The state of the bank where the command was issued will not change.

Refer to Section 11: Dual operations and multiple bank architecture for detailed information

about simultaneous operations allowed during a Suspend EFA Block operation.

During a Suspend EFA Block operation, the device can be placed in standby mode by taking

Chip Enable to VIH. Program/Erase is aborted if Reset, RP, is VIL.

See Appendix C, Figure 22: Program Suspend & Resume flowchart and pseudo code and

Figure 24: Erase Suspend & Resume flowchart and pseudo code, for flowcharts for using

the Suspend EFA Block command.

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