MBM29F200TC Fujitsu Media Devices Limited, MBM29F200TC Datasheet - Page 19

• Manufacturer Part Number: MBM29F200TC
• Description: 2M (256K X 8/128K X 16) BIT
• Manufacturer: Fujitsu Media Devices Limited

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DQ
Sector Erase Timer
DQ
Toggle Bit II
Notes: 1. These status flags apply when outputs are read from a sector that has been erase-suspended.
Program
Erase
Erase Suspend Read
(Erase-Suspended Sector)
(Note 1)
Erase Suspend Program
condition. The CE circuit will partially power down the device under these conditions (to approximately 2 mA).
The OE and WE pins will control the output disable functions as described in Tables 2 and 3.
The DQ
case the device locks out and never complete the Embedded Algorithm operation. Hence, the system never
reads a valid data on DQ
DQ
used.
After the completion of the initial sector erase command sequence the sector erase time-out will begin. DQ
remain low until the time-out is complete. Data Polling and Toggle Bit are valid after the initial sector erase
command sequence.
If Data Polling or the Toggle Bit I indicates the device has been written with a valid erase command, DQ
be used to determine if the sector erase timer window is still open. If DQ
erase cycle has begun; attempts to write subsequent commands to the device will be ignored until the erase
operation is completed as indicated by Data Polling or Toggle Bit I. If DQ
additional sector erase commands. To insure the command has been accepted, the system software should
check the status of DQ
second status check, the command may not have been accepted.
Refer to Table 8: Hardware Sequence Flags.
This toggle bit II, along with DQ
Algorithm or in Erase Suspend.
Successive reads from the erasing sector will cause DQ
device is in the erase-suspended-read mode, successive reads from the erase-suspended sector will cause DQ
to toggle. When the device is in the erase-suspended-program mode, successive reads from the byte address
of the non-erase suspended sector will indicate a logic “1” at the DQ
DQ
Program operation is in progress. The behavior of these two status bits, along with that of DQ
as follows:
For example, DQ
DQ
Furthermore, DQ
mode, DQ
3
2
5
6
6
2. These status flags apply when outputs are read from the byte address of the non-erase suspended sector.
bit will indicate a “1.” Please note that this is not a device failure condition since the device was incorrectly
is different from DQ
does not). See also Table 8 and Figure 22.
5
failure condition may also appear if a user tries to program a non blank location without erasing. In this
2
toggles if this bit is read from the erasing sector.
Mode
MBM29F200TC
2
2
and DQ
can also be used to determine which sector is being erased. When the device is in the erase
3
prior to and following each subsequent sector erase command. If DQ
2
7
6
in that DQ
bit and DQ
can be used together to determine the erase-suspend-read mode (DQ
6
, can be used to determine whether the device is in the Embedded Erase
6
6
toggles only when the standard program or Erase, or Erase Suspend
never stops toggling. Once the device has exceeded timing limits, the
DQ
7
DQ
DQ
(Note 2)
0
1
-55/-70/-90
7
7
2
to toggle during the Embedded Erase Algorithm. If the
/MBM29F200BC
toggles
toggles
toggles
2
DQ
bit.
1
3
3
6
is high (“1”) the internally controlled
is low (“0”), the device will accept
3
1 (Note 2)
7
were high on the
, is summarized
toggles
toggles
DQ
2
1
toggles while
-55/-70/-90
2
3
may
3
will
2
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