MBM29F800TA-55/-70/-90/MBM29F800BA-55/-70/-90
When the Erase Suspend command is written during the Sector Erase operation, the device will take a maximum
of 20 µs to suspend the erase operation. When the device has entered the erase-suspended mode, the RY/BY
output pin and the DQ7 bit will be at logic “1”, and DQ6 will stop toggling. The user must use the address of the
erasing sector for reading DQ6 and DQ7 to determine if the erase operation has been 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 DQ2 to toggle. (See the section on DQ2).
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
beprogrammedtosectorsthatarenoterase-suspended. Successivelyreadingfromtheerase-suspendedsector
whilethedeviceisintheerase-suspend-programmodewillcauseDQ2 totoggle. Theendoftheerase-suspended
Program operation is detected by the RY/BY output pin, Data polling of DQ7, or by the Toggle Bit I (DQ6) which
is the same as the regular Program operation. Note that DQ7 must be read from the Program address while DQ6
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.
Write Operation Status
Table 8 Hardware Sequence Flags
Status
DQ7
DQ6
DQ5
0
DQ3
0
DQ2
1
Embedded Program Algorithm
Embedded Erase Algorithm
DQ7 Toggle
0
1
Toggle
1
0
1
Toggle
Erase Suspend Read (Erase Suspended
Sector)
0
0
Toggle
Data
In
Progress
Erase
Suspended
Mode
Erase Suspend Read (Non-Erase
Suspended Sector)
Data
DQ7
Data
Data Data
Erase Suspend Program (Non-Erase
Suspended Sector)
Toggle
(Note 1)
1
0
0
(Note 2)
Embedded Program Algorithm
DQ7 Toggle
Toggle
1
1
0
1
1
Exceeded Embedded Erase Algorithm
0
N/A
Time
Limits
Erase
Suspended
Mode
Erase Suspend Program (Non-Erase
Suspended Sector)
DQ7 Toggle
1
0
N/A
Notes: 1. Performing successive read operations from any address will cause DQ6 to toggle.
2. Reading the byte address being programmed while in the erase-suspend program mode will indicate
logic “1” at the DQ2 bit. However, successive reads from the erase-suspended sector will cause DQ2 to
toggle.
3. DQ0 and DQ1 are reserve pins for future use. DQ4 is Fujitsu internal use only.
4. DQ8 to DQ15 are “DON’T CARES” because there is for × 16 mode.
18
FUJITSU [ FUJITSU ]
