M58LT128GST datasheet(32/98 Pages) STMICROELECTRONICS

32 / 98 page

5 Status Register

M58LT128GST, M58LT128GSB

32/98

5.3

Erase Status Bit (SR5)

The Erase Status bit is used to identify if there was an error during a block or bank erase

operation.

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

maximum number of pulses to the block or bank and still failed to verify that it has erased

correctly.

The Erase Status bit should be read once the Program/Erase Controller Status bit is High

(Program/Erase Controller inactive).

Once set High, the Erase 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 will

appear to fail.

5.4

Program Status Bit (SR4)

The Program Status bit is used to identify if there was an error during a program operation.

The Program Status bit 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 will also set 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 will

appear to fail.

5.5

VPP Status Bit (SR3)

The VPP Status bit is used to identify 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 will appear to fail.

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