M58LR128KB855 datasheet(26/110 Pages) NUMONYX

26 / 110 page

Command interface

M58LR128KT, M58LR128KB, M58LR256KT, M58LR256KB

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4.10.3

Exit phase

Status Register P/EC bit SR7 set to ‘1’ indicates that the device has exited the buffer

enhanced factory program operation and returned to read Status Register mode. A full

Status Register check should be done to ensure that the block has been successfully

programmed. See Section 5: Status Register for more details.

For optimum performance the Buffer Enhanced Factory Program command should be

limited to a maximum of 100 program/erase cycles per block. If this limit is exceeded the

internal algorithm continues to work properly but some degradation in performance is

possible. Typical program times are given in Table 18.

See Appendix C, Figure 26: Buffer enhanced factory program flowchart and pseudocode for

a suggested flowchart on using the Buffer Enhanced Factory Program command.

4.11

Program/Erase Suspend command

The Program/Erase Suspend command pauses a program or block erase operation. The

command can be addressed to any bank.

The Program/Erase Resume command is required to restart the suspended operation.

One bus write cycle is required to issue the Program/Erase Suspend command. Once the

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

set to ‘1’.

The following commands are accepted during Program/Erase Suspend:

–

Program/Erase Resume

–

Read Array (data from erase-suspended block or program-suspended word is not

valid)

–

Read Status Register

–

Read Electronic Signature

–

Read CFI Query

–

Clear Status Register

Additionally, if the suspended operation was a block erase then the following commands are

also accepted:

–

Set Configuration Register

–

Program (except in erase-suspended block)

–

Buffer Program (except in erase suspended blocks)

–

Block Lock

–

Block Lock-Down

–

Block Unlock.

During an erase suspend the block being erased can be protected by issuing the Block Lock

or Block Lock-Down commands. When the Program/Erase Resume command is issued the

operation completes.

It is possible to accumulate multiple suspend operations. For example,it is possible to

suspend an erase operation, start a program operation, suspend the program operation,

and then read the array.

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