M58LW032D 데이터 시트보기 (PDF) - STMicroelectronics

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M58LW032D

32 Mbit (4Mb x8, 2Mb x16, Uniform Block) 3V Supply Flash Memory

STMicroelectronics 

M58LW032D

I 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.

I 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.

I If the failure is due to a program on a protected

block then Block Protection Status bit (SR1) is

also set High, VOH.

I 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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