MBM29LV320TE Fujitsu Microelectronics, Inc., MBM29LV320TE Datasheet - Page 28

• Manufacturer Part Number: MBM29LV320TE
• Description: 32 M 4 M X 8/2 M X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

28
MBM29LV320TE/BE
6.
7.
(1) Fast Mode
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 system can determine the status of the erase operation by using DQ
RY/BY.
The sector erase begins after the “t
the last sector erase command pulse and terminates when the data on DQ
Status”.) at which time the device return to the read mode. Data polling and Toggle Bit must be performed at
an address within any of the sectors being erased.
Multiple Sector Erase Time; [Sector Erase Time Sector Program Time (Preprogramming) ] Number of Sector
Erase
“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
(B0h) 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 (30h) 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 “t
RY/BY output pin will be at Hi-Z and the DQ
use the address of the erasing sector for reading DQ
suspended. Further writes of the Erase Suspend command are ignored.
When the erase operation has been suspended, the device defaults 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 com-
mand sequence for Program. This program mode is known as the erase-suspend-program mode. Again, pro-
gramming 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 device is in the erase-suspend-program mode will cause DQ
Program operation is detected by the RY/BY output pin, Data polling of DQ
is the same as the regular Program operation. Note that DQ
can be read from any address.
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.
The device 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 register. In this mode,
the required bus cycle for programming is two cycles instead of four bus cycles in standard program command.
(Do not write erase command in this mode.) The read operation is also executed after exiting this mode. To exit
this mode, it is necessary to write Fast Mode Reset command into the command register. (See “8. Embedded
Program
Fast Mode.
Erase Suspend/Resume
Extended Command
SPD
” to suspend the erase operation. When the device has entered the erase-suspended mode, the
TM
Algorithm for Fast Mode” in FLOW CHART .) The V
TM
Algorithm” in FLOW CHART illustrates the Embedded Erase
TOW
” time out from the rising edge of CE or WE whichever happens first for
80/90/10
7
bit will be at logic “1”, and DQ
6
and DQ
2
to toggle. (See “17. DQ
7
must be read from the Program address while DQ
CC
7
to determine if the erase operation has been
active current is required even CE V
2
to toggle. The end of the erase-suspended
7
(Data Polling) , DQ
7
6
7
or by the Toggle Bit I (DQ
will stop toggling. The user must
is “1” (See “12. Write Operation
2
”.)
TM
Algorithm using typical
6
(Toggle Bit) , or
IH
6
) which
during
6