MBM29LV400TC-55PF Meet Spansion Inc., MBM29LV400TC-55PF Datasheet - Page 20

• Manufacturer Part Number: MBM29LV400TC-55PF
• Description: Flash Memory Cmos 4m 512k ? 8/256k ? 16 Bit
• Manufacturer: Meet Spansion Inc.

6. Erase Suspend
7. Extended Command
(1) Fast Mode
Sector erase does not require the user to program the devices prior to erase. The devices automatically program
all memory locations in the sector(s) to be erased prior to electrical erase (Preprogram function). When erasing
a sector or sectors the remaining unselected sectors are not affected. The system is not required to provide any
controls or timings during these operations.
The automatic sector erase begins after the 50 s time out from the rising edge of the WE pulse for the last
sector erase command pulse and terminates when the data on DQ
which time the devices return to the read mode. Data polling must be performed at an address within any of
the sectors being erased. Multiple Sector Erase Time; [Sector Erase Time + Sector Program Time
(Preprogramming)]
“2. Embedded Erase
command strings and bus operations.
The Erase Suspend command allows the user to interrupt a Sector Erase operation and then perform data reads
from or programs to a sector not being erased. This command is applicable ONLY during the Sector Erase
operation which includes the time-out period for sector erase. The Erase Suspend command will be ignored if
written during the Chip Erase operation or Embedded Program Algorithm. Writting the Erase Suspend command
during the Sector Erase time-out results in immediate termination of the time-out period and suspension of the
erase operation.
Writing the Erase Resume command resumes the erase operation. The addresses are DON’T CARES when
writing the Erase Suspend or Erase Resume command.
When the Erase Suspend command is written during the Sector Erase operation, the device will take a maximum
of 20 s to suspend the erase operation. When the devices have entered the erase-suspended mode, the RY/
BY output pin and the DQ
the erasing sector for reading DQ
writes of the Erase Suspend command are ignored.
When the erase operation has been suspended, the devices default to the erase-suspend-read mode. Reading
data in this mode is the same as reading from the standard read mode except that the data must be read from
sectors that have not been erase-suspended. Successively reading from the erase-suspended sector while the
device is in the erase-suspend-read mode will cause DQ
After entering the erase-suspend-read mode, the user can program the device by writing the appropriate
command sequence for Program. This program mode is known as the erase-suspend-program mode. Again,
programming in this mode is the same as programming in the regular Program mode except that the data must
be programmed to sectors that are not erase-suspended. Successively reading from the erase-suspended sector
while the devices are in the erase-suspend-program mode will cause DQ
suspended Program operation is detected by the RY/BY output pin, Data polling of DQ
(DQ
while DQ
To resume the operation of Sector Erase, the Resume command (30h) should be written. Any further writes of
the Resume command at this point will be ignored. Another Erase Suspend command can be written after the
chip has resumed erasing.
MBM29LV400TC/BC has Fast Mode function. This mode dispenses with the initial two unclock cycles
required in the standard program command sequence by writing Fast Mode command into the command
6
) which is the same as the regular Program operation. Note that DQ
6
can be read from any address.
MBM29LV400TC
TM
Number of Sector Erase
Algorithm” in FLOW CHART illustrates the Embedded Erase
7
bit will be at logic “1”, and DQ
6
and DQ
7
to determine if the erase operation has been suspended. Further
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6
2
will stop toggling. The user must use the address of
to toggle. (See the section on DQ
/MBM29LV400BC
7
is “1” (See “8. Write Operation Status”.) at
7
must be read from the Program address
2
to toggle. The end of the erase-
TM
7
Algorithm using typical
, or by the Toggle Bit I
2
.)
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