MBM29PL65LM Fujitsu Media Devices, MBM29PL65LM Datasheet - Page 25

• Manufacturer Part Number: MBM29PL65LM
• Description: FLASH MEMORY CMOS 64 M (4M X 16) BIT MirrorFlashTM
• Manufacturer: Fujitsu Media Devices

DQ
Toggle Bit I
DQ
Exceeded Timing Limits
DQ
Sector Erase Timer
Once the Embedded Algorithm operation is close to being completed, the device data pins (DQ
asynchronously while the output enable (OE) is asserted low. This means that device is driving status information
on DQ
the DQ
operation and DQ
DQ
The Data Polling feature is active only during the Embedded Programming Algorithm, Embedded Erase Algorithm
or sector erase time-out. See “Toggle Bit Status” and “Data Polling during Embedded Algorithm Operation Timing
Diagram”.
The device also features the “Toggle Bit I” as a method to indicate to the host system that the Embedded
Algorithms are in progress or completed.
During Embedded Program or Erase Algorithm cycle, successive attempts to read (OE toggling) data from the
busy bank will result in DQ
cycle is completed, DQ
programming, the Toggle Bit I is valid after the rising edge of the fourth write pulse in the four write pulse
sequences. For chip erase and sector erase, the Toggle Bit I is valid after the rising edge of the sixth write pulse
in the six write pulse sequences. The Toggle Bit I is active during the sector time out.
In programming, if the sector being written is protected, the toggle bit will toggle for about 1 s and then stop
toggling with data unchanged. In erase, the device will erase all selected sectors except for protected ones. If
all selected sectors are protected, the chip will toggle the toggle bit for about 400 µs and then drop back into
read mode, having data kept remained.
Either CE or OE toggling will cause DQ
DQ
The system can use DQ
is actively erased (that is, the Embedded Erase Algorithm is in progress) , DQ
Erase Suspend mode, DQ
to toggle. See “AC Wavefrom for Toggle Bit I during Embedded Algorithm Operations”.
DQ
these conditions DQ
not successfully completed. Data Polling is only operating function of the device under this condition. The CE
circuit will partially power down device under these conditions (to approximately 2 mA) . The OE and WE pins
will control the output disable functions as described in "MBM29PL65LM User Bus Operations Table (DW/W
V
The DQ
this case the device locks out and never completes the Embedded Algorithm operation. Hence, the system never
reads valid data on DQ
bit will indicate a “1.” Please note that this is not a device failure condition since the device was incorrectly used.
If this occurs, reset device with the command sequence.
After completion of the initial sector erase command sequence, sector erase time-out begins. DQ
low until the time-out is completed. Data Polling and Toggle Bit are valid after the initial sector erase command
sequence.
6
5
3
IL
)" and "MBM29XL12DF User Bus Operations Table (DW/W
7
6
5
will be read on successive read attempts.
to toggle.
will indicate if the program or erase time has exceeded the specified limits (internal pulse count) . Under
7
7
at one instant, and then that byte’s valid data at the next instant. Depending on when the system samples
5
output, it may read the status or valid data. Even if device has completed the Embedded Algorithm
failure condition may also appear if a user tries to program a non-blank location without pre-erase. In
7
has a valid data, data outputs on DQ
5
will produce “1”. This is a failure condition indicating that the program or erase cycle was
7
6
6
bit and DQ
will stop toggling and valid data will be read on the next successive attempts. During
to determine whether a sector is actively erased or is erase-suspended. When a bank
6
6
stops toggling. Successive read cycles during erase-suspend-program cause DQ
toggling between one and zero. Once the Embedded Program or Erase Algorithm
6
never stop toggling. Once the device has exceeded timing limits, the DQ
6
to toggle. In addition, an Erase Suspend/Resume command will cause
0
to DQ
6
V
may still be invalid. The valid data on DQ
IH
)" in
MBM29PL65LM
DEVICE BUS OPERATION.
6
toggles. When a bank enters the
7
) may change
3
will remain
-90/10
0
to
6
5
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