m58lw064c STMicroelectronics, m58lw064c Datasheet - Page 27

• Manufacturer Part Number: m58lw064c
• Description: 64 Mbit 4mb X16, Uniform Block, Burst 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

V
failed. Depending on the cause of the failure other
Status Register bits may also be set to High, V
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.
V
be used to identify if a Program, Erase, Block Pro-
tection or Block Unprotection operation has been
attempted when V
When the V
gram, Erase, Block Protection or Block Unprotec-
tion operations have been attempted with V
Low, V
mand, or hardware reset. When the V
bit is High, V
tion or Block Unprotection operation has been at-
tempted with V
Once set High, the V
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.
OH
PEN
If only the Program Status bit (SR4) is set
High, V
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 V
bit (SR3) is also set High, V
If the failure is due to a program on a protected
block then Block Protection Status bit (SR1) is
also set High, V
If the failure is due to a program or erase
incorrect command sequence then Erase
Status bit (SR5) is also set High, V
, the program or block protect operation has
Status Bit (SR3). The V
IL
, since the last Clear Status Register com-
OH
PEN
OH
, then the Program/Erase Controller
PEN
, a Program, Erase, Block Protec-
Status bit is Low, V
PEN
PEN
Low, V
OH
PEN
low, V
.
is Low, V
Status bit can only be re-
IL
.
OL
, then V
PEN
OH
IL
.
.
Status bit can
OL
PEN
OH
PEN
, no Pro-
.
Status
Status
PEN
OH
.
Program Suspend Status Bit (SR2). The
gram Suspend Status bit indicates that a Program
operation has been suspended and is waiting to
be resumed. 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,
V
completed its operation; when the bit is High, V
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 (SR1). The
Protection Status bit can be used to identify if a
program or erase operation has tried to modify the
contents of a protected block.
When the Block Protection Status bit is Low, V
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, V
a program (SR4 set High) or erase (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). SR0 of the Status Register is
reserved. Its value should be masked.
OL
, the Program/Erase Controller is active or has
M58LW064C
Block
27/61
Pro-
OH
OH
OL
,
,
,