MBM29PL64LM SPANSION, MBM29PL64LM Datasheet - Page 32

• Manufacturer Part Number: MBM29PL64LM
• Description: Flash Memory 64 M (8M X 8/4M X 16) BIT
• Manufacturer: SPANSION

DQ
Exceeded Timing Limits
DQ
Sector Erase Timer
DQ
Toggle Bit II
DQ
these conditions DQ
not successfully completed. Data Polling is the only operating function of the device under this 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 “MBM29PL64LM User Bus Operations (Word
Mode : BYTE = V
OPERATION.
The DQ
this case the device locks out and never completes the Embedded Algorithm operation. Hence, the system never
reads a valid data on DQ
bit will indicate a “1”. Note that this is not a device failure condition since the device was incorrectly used. If this
occurs, reset the device with command sequence.
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 a valid erase command has been written, DQ
determine whether the sector erase timer window is still open. If DQ
has begun. If DQ
been accepted, the system software should check the status of DQ
Sector Erase command. If DQ
See “Hardware Sequence Flags”.
This Toggle bit II, along with DQ
Algorithm or in Erase Suspend.
Successive reads from the erasing sector will cause DQ
devices are in the erase-suspended-read mode, successive reads from the erase-suspended sector will cause
DQ
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
GRAM.
Furthermore, DQ
if this bit is read from an erasing sector.
5
3
2
5
2
6
2
to toggle. When the device is in the erase-suspended-program mode, successive reads from the non-erase
will indicate if the program or erase time has exceeded the specified limits (internal pulse count). Under
is different from DQ
toggles while DQ
5
failure condition may also appear if a user tries to program a non blank location without pre-erase. In
3
2
2
IH
is “0”, the device will accept additional sector erase commands. To insure the command has
and DQ
can also be used to determine which sector is being erased. At the erase mode, DQ
)” and “MBM29PL64LM User Bus Operations (Byte Mode : BYTE = V
5
will produce a “1”. This is a failure condition indicating that the program or erase cycle was
6
does not.) See also “Hardware Sequence Flags” and “DQ
7
2
bit and DQ
6
in that DQ
can be used together to determine if the erase-suspend-read mode is in progress.
3
were high on the second status check, the command may not have been accepted.
6
, can be used to determine whether the devices are in the Embedded Erase
6
6
never stop toggling. Once the device has exceeded timing limits, the DQ
toggles only when the standard program or Erase, or Erase Suspend
2
bit.
2
to toggle during the Embedded Erase Algorithm. If the
3
MBM29PL64LM
3
is “1” the internally controlled erase cycle
prior to and following each subsequent
2
vs. DQ
IL
)” in
6
” in
3
7
may be used to
, is summarized
DEVICE BUS
TIMING DIA-
2
toggles
90/10
3
will
5
31