M28W640HCT70N6E NUMONYX, M28W640HCT70N6E Datasheet - Page 29

• Manufacturer Part Number: M28W640HCT70N6E
• Description: TSOP-1 48 12X20 CUSTD FLASH
• Manufacturer: NUMONYX

M28W640HCT, M28W640HCB
6.3
6.4
6.5
6.6
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. When the Erase 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 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).
Once set High, the Erase Status bit can only be reset Low by a Clear Status Register
command 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.
Program status (bit 4)
The Program Status bit is used to identify a Program failure. When the Program Status bit is
High (set to ‘1’), the Program/Erase controller has applied the maximum number of pulses to
the byte and still failed to verify that it has programmed correctly. The Program Status bit
should be read once the Program/Erase controller status bit is High (Program/Erase
controller inactive).
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 before a new command is
issued, otherwise the new command will appear to fail.
V
The V
and erase operations. The V
operation. Indeterminate results can occur if V
When the V
voltage; when the V
the V
cannot be performed.
Once set High, the V
command 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.
Program Suspend status (bit 2)
The Program Suspend status bit indicates that a program operation has been suspended.
When the Program Suspend status bit is High (set to ‘1’), a Program/Erase Suspend
command has been issued and the memory is waiting for a Program/Erase Resume
command. The Program Suspend status should only be considered valid when the
Program/Erase controller status bit is High (Program/Erase controller inactive). Bit 2 is set
within 5 µs of the Program/Erase Suspend command being issued therefore the memory
may still complete the operation rather than entering the Suspend mode.
When a Program/Erase Resume command is issued the Program Suspend Status bit
returns Low.
PP
PP
PP
status (bit 3)
Lockout voltage, V
status bit can be used to identify an invalid voltage on the V
PP
status bit is Low (set to ‘0’), the voltage on the V
PP
PP
status bit is High (set to ‘1’), the V
status bit can only be reset Low by a Clear Status Register
PPLK
PP
, the memory is protected and program and erase operations
pin is only sampled at the beginning of a program or erase
PP
becomes invalid during an operation.
PP
pin has a voltage that is below
PP
pin was sampled at a valid
PP
pin during program
Status Register
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