M58LR128KB855 datasheet(35/110 Pages) NUMONYX

35 / 110 page

M58LR128KT, M58LR128KB, M58LR256KT, M58LR256KB

Status Register

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5.3

Erase/blank check status bit (SR5)

The erase/blank check status bit identifies if there was an error during a block erase

operation. When the erase/blank check status bit is High (set to ‘1’), the Program/Erase

Controller has applied the maximum number of pulses to the block and still failed to verify

that it has erased correctly.

The erase/blank check status bit should be read once the Program/Erase Controller status

bit is High (Program/Erase Controller inactive).

The erase/blank check status bit is also used to indicate whether an error occurred during

the blank check operation. If the data at one or more locations in the block where the Blank

Check command has been issued is different from FFFFh, SR5 is set to '1'.

Once set High, the erase/blank check status bit must be set Low by a Clear Status Register

command or a hardware reset before a new erase command is issued, otherwise the new

command appears to fail.

5.4

Program status bit (SR4)

The program status bit identifies if there was an error during a program operation. It should

be read once the Program/Erase Controller status bit is High (Program/Erase Controller

inactive).

When the program status bit is High (set to ‘1’), the Program/Erase Controller has applied

the maximum number of pulses to the word and still failed to verify that it has programmed

correctly.

Attempting to program a '1' to an already programmed bit while VPP = VPPH also sets the

program status bit High. If VPP is different from VPPH, SR4 remains Low (set to '0') and the

attempt is not shown.

Once set High, the program status bit must be set Low by a Clear Status Register command

or a hardware reset before a new program command is issued, otherwise the new command

appears to fail.

5.5

VPP status bit (SR3)

The VPP status bit identifies an invalid voltage on the VPP pin during program and erase

operations. The VPP pin is only sampled at the beginning of a program or erase operation.

Program and erase operations are not guaranteed if VPP becomes invalid during an

operation

When the VPP status bit is Low (set to ‘0’), the voltage on the VPP pin was sampled at a valid

voltage.

When the VPP status bit is High (set to ‘1’), the VPP pin has a voltage that is below the VPP

lockout voltage, VPPLK, the memory is protected and program and erase operations cannot

be performed.

Once set High, the VPP 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.

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