M58LW128A datasheet(30/65 Pages) STMICROELECTRONICS

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M58LW128A, M58LW128B

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the Program/Erase Controller Status bit is High

(Program/Erase Controller inactive).

When the Program Status bit is Low, VOL, the

memory has successfully verified that the Write

Buffer has programmed correctly or the block is

protected. When the Program Status bit is High,

VOH, the program or block protect operation has

failed. Depending on the cause of the failure other

Status Register bits may also be set to High, VOH.

If only the Program Status bit (bit 4) is set High,

VOH, then the Program/Erase Controller has

applied the maximum number of pulses to the

byte and still failed to verify that the Write Buffer

has programmed correctly or that the Block is

protected.

If the failure is due to a program or block protect

with VPP low, VOL, then VPP Status bit (bit 3) is

also set High, VOH.

If the failure is due to a program on a protected

block then Block Protection Status bit (bit 1) is

also set High, VOH.

If the failure is due to a program or erase

incorrect command sequence then Erase

Status bit (bit 5) is also set High, VOH.

Once set High, the Program Status bit can only be

reset Low by a Clear Status Register command or

a hardware reset. If set High it should be reset be-

fore a new Program or Erase command is issued,

otherwise the new command will appear to fail.

VPP Status (Bit 3). The VPP Status bit can be

used to identify if a Program, Erase, Block Protec-

tion or Block Unprotection operation has been at-

tempted when VPP is Low, VIL. The VPP pin is only

sampled at the beginning of a Program or Erase

operation.

When the VPP Status bit is Low, VOL, no Program,

Erase, Block Protection or Block Unprotection op-

erations have been attempted with VPP Low, VIL,

since the last Clear Status Register command, or

hardware reset. When the VPP Status bit is High,

VOH, a Program, Erase, Block Protection or Block

Unprotection operation has been attempted with

VPP Low, VIL.

Once set High, the VPP Status bit can only be reset

by a Clear Status Register command or a hard-

ware reset. If set High it should be reset before a

new Program, Erase, Block Protection or Block

Unprotection command is issued, otherwise the

new command will appear to fail.

Program Suspend Status (Bit 2). The Program

Suspend Status bit indicates that a Program oper-

ation has been suspended and is waiting to be re-

sumed. The Program Suspend Status should only

be considered valid when the Program/Erase

Controller Status bit is High (Program/Erase Con-

troller inactive); after a Program/Erase Suspend

command is issued the memory may still complete

the operation rather than entering the Suspend

mode.

When the Program Suspend Status bit is Low,

VOL, the Program/Erase Controller is active or has

completed its operation; when the bit is High, VOH,

a Program/Erase Suspend command has been is-

sued and the memory is waiting for a Program/

Erase Resume command.

When a Program/Erase Resume command is is-

sued the Program Suspend Status bit returns Low.

Block Protection Status (Bit 1). The Block Pro-

tection Status bit can be used to identify if a Pro-

gram or Erase operation has tried to modify the

contents of a protected block.

When the Block Protection Status bit is Low, VOL,

no Program or Erase operations have been at-

tempted to protected blocks since the last Clear

Status Register command or hardware reset;

when the Block Protection Status bit is High, VOH,

a Program (Program Status bit 4 set High) or

Erase (Erase Status bit 5 set High) operation has

been attempted on a protected block.

Once set High, the Block Protection Status bit can

only be reset Low by a Clear Status Register com-

mand or a hardware reset. If set High it should be

reset before a new Program or Erase command is

issued, otherwise the new command will appear to

fail.

Reserved (Bit 0). Bit 0 of the Status Register is

reserved. Its value should be masked.

M58LW128A Datasheet(PDF) 30 Page - STMicroelectronics

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