MBM29SL800BD Fujitsu Media Devices, MBM29SL800BD Datasheet - Page 18

• Manufacturer Part Number: MBM29SL800BD
• Description: (MBM29SL800TD/BD) FLASH MEMORY CMOS 8 M (1 M X 8/512 K X 16) BIT
• Manufacturer: Fujitsu Media Devices

18
MBM29SL800TD
Erase Suspend/Resume
Extended Command
(1) Fast Mode
(2) Fast Programming
(3) Extended Sector Protection
the sectors being erased. Multiple Sector Erase Time; [Sector Erase Time Sector Program Time (Preprogram-
ming) ]
“(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. 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
of 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 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 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.
MBM29SL800TD/BD 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.
V
During Fast Mode, the programming can be executed with two bus cycles operation. The Embedded Program
Algorithm is executed by writing program set-up command (A0h) and data write cycles (PA/PD) . (Refer to the
“(8) Embedded Programming Algorithm for Fast Mode” in FLOW CHART Extended algorithm.)
In addition to normal sector protection, the MBM29SL800TD/BD has Extended Sector Protection as extended
function. This function enable to protect sector by forcing V
(Refer to “(8) Embedded Programming Algorithm for Fast Mode” in FLOW CHART Extended algorithm.) The
CC
6
active current is required even CE
) which is the same as the regular Program operation. Note that DQ
6
Number of Sector Erase
can be read from any address.
TM
Algorithm” in FLOW CHART illustrates the Embedded Erase
7
bit will be at logic “1”, and DQ
-10/12
6
and DQ
V
IH
/MBM29SL800BD
during Fast Mode.
7
to determine if the erase operation has been suspended. Further
2
to toggle. (See the section on DQ
ID
6
will stop toggling. The user must use the address
on RESET pin and write a commnad sequence.
7
must be read from the Program address
2
to toggle. The end of the erase-
-10/12
TM
7
Algorithm using typical
, or by the Toggle Bit I
2
.)