M58LR128KB855 datasheet(36/110 Pages) NUMONYX

36 / 110 page

Status Register

M58LR128KT, M58LR128KB, M58LR256KT, M58LR256KB

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5.6

Program suspend status bit (SR2)

The program suspend status bit indicates that a program operation has been suspended in

the addressed block. The program suspend status bit should only be considered valid when

the Program/Erase Controller status bit is High (Program/Erase Controller inactive).

When the program suspend status bit is High (set to ‘1’), a Program/Erase Suspend

command has been issued and the memory is waiting for a Program/Erase Resume

command.

SR2 is set within the program suspend latency time of the Program/Erase Suspend

command being issued, therefore, the memory may still complete the operation rather than

entering the suspend mode.

When a Program/Erase Resume command is issued the program suspend status bit returns

Low.

5.7

Block protection status bit (SR1)

The block protection status bit identifies if a program or block erase operation has tried to

modify the contents of a locked or locked-down block.

When the block protection status bit is High (set to ‘1’), a program or erase operation has

been attempted on a locked or locked-down block

Once set High, the block protection status bit must be set Low by a Clear Status Register

command or a hardware reset before a new program or erase command is issued,

otherwise the new command appears to fail.

5.8

Bank write/multiple word program status bit (SR0)

The bank write status bit indicates whether the addressed bank is programming or erasing.

In buffer enhanced factory program mode the multiple word program bit shows if the device

is ready to accept a new word to be programmed to the memory array.

The bank write status bit should only be considered valid when the Program/Erase

Controller status bit SR7 is Low (set to ‘0’).

When both the Program/Erase Controller status bit and the bank write status bit are Low (set

to ‘0’), the addressed bank is executing a program or erase operation. When the

Program/Erase Controller status bit is Low (set to ‘0’) and the bank write status bit is High

(set to ‘1’), a program or erase operation is being executed in a bank other than the one

being addressed.

In buffer enhanced factory program mode if multiple word program status bit is Low (set to

‘0’), the device is ready for the next word. If the multiple word program status bit is High (set

to ‘1’) the device is not ready for the next word.

For further details on how to use the Status Register, see the Flowcharts and Pseudocodes

provided in Appendix C.

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