MBM29DL34TF Fujitsu Media Devices, MBM29DL34TF Datasheet - Page 31

• Manufacturer Part Number: MBM29DL34TF
• Description: (MBM29DL34BF/TF) FLASH MEMORY CMOS 32 M (4 M X 8/2 M X 16) BIT
• Manufacturer: Fujitsu Media Devices

8. Extended Command
(1) Fast Mode Set/Reset
(2) Fast Programming
(3) Extended Sector Group Protection
When the Erase Suspend command is written during the Sector Erase operation, the devices take maximum of
“t
RY/BY output pin will be at High-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 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. Reading successively 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, it is
the same as programming in the regular Program mode, except that the data must be programmed to sectors
that are not erase-suspended. Reading successively from the erase-suspended sector while the devices are in
the erase-suspend-program mode will cause DQ
is detected by the RY/BY output pin, Data polling of DQ
regular Program operation. Note that DQ
any address within bank being erase-suspended.
To resume the operation of Sector Erase, the Resume command (30h) should be written to the bank being erase
suspended. 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. It 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 consists of 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, write Fast Mode Reset command into the command register. The first cycle must contain
the bank address. (Refer to “8. Embedded Program
active current is required even CE
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 “8.
Embedded Program
In addition to normal sector group protection, the device has Extended Sector Group Protection as extended
function. This function enables to protect sector group by forcing V
sequence. Unlike conventional procedures, it is not necessary to force V
The only RESET pin requires V
requires V
into the command register. Then, the sector group addresses pins (A
and (A
addresses pins is recommended) , and write extended sector group protection command (60h) . A sector group
is typically protected in 250 s. To verify programming of the protection circuitry, the sector group addresses
pins (A
a command (40h) . Following the command write, a logic “1” at device output DQ
sector in the read operation. If the output data is logic “0”, write extended sector group protection command
(60h) again. To terminate the operation, set RESET pin to V
Timing Diagram” in
CHART.)
SPD
” to suspend the erase operation. When the devices have entered the erase-suspended mode, the
6
20
, A
, A
ID
3
, A
19
on RESET pin. With this condition, the operation is initiated by writing the set-up command (60h)
, A
2
, A
18
1
, A
, A
TM
17
0
)
, A
Algorithm for Fast Mode” in
TIMING DIAGRAM and “7. Extended Sector Group Protection Algorithm” in
16
, A
(0, 0, 0, 1, 0) should be set to the sector group to be protected (set V
15
, A
ID
for sector group protection in this mode. The extended sector group protection
14
, A
V
13
IH
and A
during Fast Mode.
7
must be read from the Program address while DQ
12
7
) and (A
bit will be at logic “1”, and DQ
2
to toggle. The end of the erase-suspended Program operation
TM
FLOW CHART.)
6
Algorithm for Fast Mode” in
6
and DQ
, A
7
2
or by the Toggle Bit I (DQ
to toggle. (See “17. DQ
3
, A
IH
. (Refer to “17. Extended Sector Group Protection
2
, A
7
to determine if the erase operation has been
1
MBM29DL34TF/BF
, A
0
ID
20
)
, A
on RESET pin and write a command
ID
19
(0, 0, 0, 1, 0) should be set and write
, A
and control timing for control pins.
6
will stop toggling. The user must
18
, A
2
”.)
17
0
6
) which is the same as the
, A
will produce for protected
FLOW CHART.) The V
16
, A
15
6
, A
can be read from
14
IL
, A
for the other
13
and A
FLOW
70
12
CC
)
31