M58BW016BB100T3T STMICROELECTRONICS [STMicroelectronics], M58BW016BB100T3T Datasheet - Page 28

• Manufacturer Part Number: M58BW016BB100T3T
• Description: 16 Mbit 512Kb x32, Boot Block, Burst 3V Supply Flash Memories
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M58BW016BT, M58BW016BB, M58BW016DT, M58BW016DB
STATUS REGISTER
The Status Register provides information on the
current or previous Program, Erase, Block Protect
or Tuning Protection operation. The various bits in
the Status Register convey information and errors
on the operation. They are output on DQ7-DQ0.
To read the Status Register the Read Status Reg-
ister command can be issued. The Status Register
is automatically read after Program, Erase, Block
Protect, Program/Erase Resume commands. The
Status Register can be read from any address.
The contents of the Status Register can be updat-
ed during an erase or program operation by tog-
gling the Output Enable or Output Disable pins or
by dis-activating (Chip Enable, V
tivating (Chip Enable and Output Enable, V
Output Disable, V
The Status Register bits are summarized in Table
11, Status Register Bits. Refer to Table 11 in con-
junction with the following text descriptions.
Program/Erase Controller Status (Bit 7)
The Program/Erase Controller Status bit indicates
whether the Program/Erase Controller is active or
inactive. When the Program/Erase Controller Sta-
tus bit is set to ‘0’, the Program/Erase Controller is
active; when bit7 is set to ‘1’, the Program/Erase
Controller is inactive.
The Program/Erase Controller Status is set to ‘0’
immediately after a Program/Erase Suspend com-
mand is issued until the Program/Erase Controller
pauses. After the Program/Erase Controller paus-
es the bit is set to ‘1’.
During Program and Erase operations the Pro-
gram/Erase Controller Status bit can be polled to
find the end of the operation. The other bits in the
Status Register should not be tested until the Pro-
gram/Erase Controller completes the operation
and the bit is set to ‘1’.
After the Program/Erase Controller completes its
operation the Erase Status (bit5), Program Status
and Tuning Protection Unlock status (bit4) bits
should be tested for errors.
Erase Suspend Status (Bit 6)
The Erase Suspend Status bit indicates that an
Erase operation has been suspended and is wait-
ing to be resumed. The Erase Suspend Status
should only be considered valid when the Pro-
gram/Erase Controller Status bit is set to ‘1’ (Pro-
gram/Erase Controller inactive); after a Program/
Erase Suspend command is issued the memory
may still complete the operation rather than enter-
ing the Suspend mode.
When the Erase Suspend Status bit is set to ‘0’,
the Program/Erase Controller is active or has com-
pleted its operation; when the bit is set to ‘1’, a Pro-
gram/Erase Suspend command has been issued
28/63
IH
.) the device.
IH
) and then reac-
IL
, and
and the memory is waiting for a Program/Erase
Resume command.
When a Program/Erase Resume command is is-
sued the Erase Suspend Status bit returns to ‘0’.
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 re-
set to ‘0’ by a Clear Status Register command or a
hardware reset. If set to ‘1’ it should be reset be-
fore a new Program or Erase command is issued,
otherwise the new command will appear to fail.
Program Status, Tuning Protection Unlock
Status (Bit 4)
The Program Status and Tuning Protection Unlock
Status bit is used to identify a Program failure or a
Tuning Protection Code verify 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 successful-
ly verified that the device has programmed cor-
rectly or that the correct Tuning Protection Code
has been written. When bit4 is set to ‘1’ the device
has failed to verify that the data has been pro-
grammed correctly or that the correct Tuning Pro-
tection code has been written.
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 be-
fore a new Program or Erase command is issued,
otherwise the new command will appear to fail.
V
The V
valid voltage on the V
and erase operations. The V
at the beginning of a program or erase operation.
Indeterminate results can occur if V
valid during a fast Program or Erase operation.
When the V
the V
the V
voltage that is below the V
PLK
Once set to ‘1’, the V
to ‘0’ by a Clear Status Register command or a
hardware reset. If set to ‘1’ it should be reset be-
PP
.
Status (Bit 3)
PP
PP
PP
pin was sampled at a valid voltage; when
Status bit is set to ‘1’, the V
Status bit can be used to identify an in-
PP
Status bit is set to ‘0’, the voltage on
PP
PP
Status bit can only be reset
pin during fast program
PP
PP
Lockout Voltage, V
pin is only sampled
PP
PP
becomes in-
pin has a
P-