M58BW016DB datasheet(35/69 Pages) STMICROELECTRONICS

35 / 69 page

M58BW016DT, M58BW016DB, M58BW016FT, M58BW016FB

Status Register

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5.3

Erase Status (bit 5)

The Erase Status bit can be used to identify if the memory has failed to verify that the block

has erased correctly. The Erase Status bit should be read once the Program/Erase

Controller Status bit is High (Program/Erase controller inactive).

When the Erase Status bit is set to ‘0’, the memory has successfully verified that the block

has erased correctly. When the Erase Status bit is set to ‘1’, the Program/Erase controller

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

block has erased correctly.

Once set to ‘1’, the Erase Status bit can only be reset to ‘0’ by a Clear Status Register

command or a hardware reset. If set to ‘1’ it should be reset before a new Program or Erase

command is issued, otherwise the new command will appear to fail.

5.4

Program Status (bit 4)

The Program Status bit is used to identify a program failure. Bit4 should be read once the

Program/Erase Controller Status bit is High (Program/Erase controller inactive).

When bit4 is set to ‘0’ the memory has successfully verified that the device has programmed

correctly. When bit4 is set to ‘1’ the device has failed to verify that the data has been

programmed correctly.

Once set to 1’, the Program Status bit can only be reset to ‘0’ by a Clear Status Register

command or a hardware reset. If set to ‘1’ it should be reset before a new Program or Erase

command is issued, otherwise the new command will appear to fail.

5.5

VPP Status (bit 3)

The VPP Status bit can be used to identify an invalid voltage on the VPP pin during fast

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

or erase operation. Indeterminate results can occur if VPP becomes invalid during a fast

program or erase operation.

When the VPP Status bit is set to ‘0’, the voltage on the VPP pin was sampled at a valid

voltage; when the VPP Status bit is set to ‘1’, the VPP pin has a voltage that is below the VPP

Lockout voltage, VPPLK.

Once set to ‘1’, the VPP Status bit can only be reset to ‘0’ by a Clear Status Register

command or a hardware reset. If set to ‘1’ it should be reset before a new Program or Erase

command is issued, otherwise the new command will appear to fail.

M58BW016DB Datasheet(PDF) 35 Page - STMicroelectronics