Status Register
M58LT128HST, M58LT128HSB
5.3
Erase/Blank Check status bit (SR5)
The Erase/Blank Check status bit is used to identify if there was an error during a Block
Erase operation. When the Erase/Blank Check status bit is High (set to ‘1’), the
Program/Erase Controller has applied the maximum number of pulses to the block and still
failed to verify that it has erased correctly.
The Erase/Blank Check status bit should be read once the Program/Erase Controller status
bit is High (Program/Erase Controller inactive).
The Erase/Blank Check status bit is also used to indicate whether an error occurred during
the Blank Check operation. If the data at one or more locations in the block where the Blank
Check command has been issued is different from FFFFh, SR5 is set to '1'.
Once set High, the Erase/Blank Check status bit must be set Low by a Clear Status Register
command or a hardware reset before a new erase command is issued, otherwise the new
command appears to fail.
5.4
Program status bit (SR4)
The Program status bit is used to identify if there was an error during a Program operation.
The Program status bit should be read once the Program/Erase Controller status bit is High
(Program/Erase Controller inactive).
When the Program status bit is High (set to ‘1’), the Program/Erase Controller has applied
the maximum number of pulses to the word and still failed to verify that it has programmed
correctly. Attempting to program a '1' to an already programmed bit while V = V
also
PP
PPH
sets the Program status bit High. If V is different from V
, SR4 remains Low (set to '0')
PP
PPH
and the attempt is not shown.
Once set High, the Program status bit must be set Low by a Clear Status Register command
or a hardware reset before a new Program command is issued, otherwise the new
command appears to fail.
5.5
VPP status bit (SR3)
The V status bit is used to identify an invalid voltage on the V pin during Program and
PP
PP
Erase operations. The V pin is only sampled at the beginning of a Program or Erase
PP
operation. Program and Erase operations are not guaranteed if V becomes invalid during
PP
an operation.
When the V status bit is Low (set to ‘0’), the voltage on the V pin was sampled at a valid
PP
PP
voltage.
When the V status bit is High (set to ‘1’), the V pin has a voltage that is below the V
PP
PP
PP
Lockout Voltage, V
. This means the memory is protected and Program and Erase
PPLK
operations cannot be performed.
Once set High, the V status bit must be set Low by a Clear Status Register command or a
PP
hardware reset before a new Program or Erase command is issued, otherwise the new
command appears to fail.
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NUMONYX [ NUMONYX B.V ]
