M58LW032D datasheet(21/50 Pages) STMICROELECTRONICS

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M58LW032D

If only the Program Status bit (SR4) 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 VPEN low, VOL, then VPEN Status

bit (SR3) is also set High, VOH.

If the failure is due to a program on a protected

block then Block Protection Status bit (SR1) is

also set High, VOH.

If the failure is due to a program or erase

incorrect command sequence then Erase

Status bit (SR5) 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.

VPEN Status (SR3). The VPEN Status bit can be

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

tion or Block Unprotection operation has been at-

tempted when VPEN is Low, VIL.

When the VPEN Status bit is Low, VOL, no Pro-

gram, Erase, Block Protection or Block Unprotec-

tion operations have been attempted with VPEN

Low, VIL, since the last Clear Status Register com-

mand, or hardware reset. When the VPEN Status

bit is High, VOH, a Program, Erase, Block Protec-

tion or Block Unprotection operation has been at-

tempted with VPEN Low, VIL.

Once set High, the VPEN Status bit can only be re-

set 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 (SR2). 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 (SR1). 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 SR4 set High) or

Erase (Erase Status bit SR5 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 (SR0). Bit SR0 of the Status Register

is reserved. Its value should be masked.

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