M58LR128FT datasheet(23/82 Pages) STMICROELECTRONICS

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M58LR128FT, M58LR128FB

Program Suspend Status Bit (SR2). The

Pro-

gram 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 Con-

troller 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 Pro-

gram/Erase Resume command.

SR2 is set within the Program Suspend Latency

time of the Program/Erase Suspend command be-

ing issued therefore the memory may still com-

plete the operation rather than entering the

Suspend mode.

When a Program/Erase Resume command is is-

sued the Program Suspend Status bit returns Low.

Block Protection Status Bit (SR1). The

Block

Protection Status bit is used to identify if a Pro-

gram or Block Erase operation has tried to modify

the contents of a locked block.

When the Block Protection Status bit is High (set

to ‘1’), a program or erase operation has been at-

tempted on a locked block.

Once set High, the Block Protection Status bit

must be set Low by a Clear Status Register com-

mand or a hardware reset before a new program

or erase command is issued, otherwise the new

command will appear to fail.

Bank Write/Multiple Word Program Status Bit

(SR0). The Bank Write Status bit indicates wheth-

er 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 consid-

ered valid when the Program/Erase Controller Sta-

tus 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 Con-

troller 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 Mul-

tiple Word Program Status bit is Low (set to ‘0’),

the device is ready for the next Word, if the Multi-

ple 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 Regis-

ter, see the Flowcharts and Pseudocodes provid-

ed in APPENDIX C.

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