MBM29DL16XTE/BE70/90
Hardware Sequence Flags Table
Status
Embedded Program Algorithm
Embedded Erase Algorithm
DQ7
DQ6
DQ5 DQ3
DQ2
1
DQ7 Toggle
0
0
0
1
0
1
Toggle
1
Toggle*1
Erase Suspend Read
(Erase Suspended Sector)
0
0
Toggle
Erase
Erase Suspend Read
Suspended
In Progress Mode
Data Data Data Data Data
1 *2
(Non-Erase Suspended Sector)
Erase Suspend Program
(Non-Erase Suspended Sector)
DQ7 Toggle
0
0
Program Suspend Read
(Program Suspended Sector)
Data Data Data Data Data
Data Data Data Data Data
Program
Suspended
Mode
Program Suspend Read
(Non-Program Suspended Sector)
Embedded Program Algorithm
Embedded Erase Algorithm
Erase
DQ7 Toggle
Toggle
1
1
0
1
1
0
N/A
Exceeded
Time Limits
Erase Suspend Program
Suspended
Mode
DQ7 Toggle
1
0
N/A
(Non-Erase Suspended Sector)
*1 : Successive reads from the erasing or erase-suspend sector cause DQ2 to toggle.
*2 : Reading from non-erase suspend sector address indicates logic “1” at the DQ2 bit.
• DQ7
Data Polling
The MBM29DL16XTE/BE devices feature Data Polling as a method to indicate to the host that the Embedded
Algorithms are in progress or completed. During the Embedded Program Algorithm an attempt to read the
devices will produce the complement of the data last written to DQ7. Upon completion of the Embedded Program
Algorithm, an attempt to read the device will produce the true data last written to DQ7. During the Embedded
Erase Algorithm, an attempt to read the device will produce a “0” at the DQ7 output. Upon completion of the
Embedded Erase Algorithm an attempt to read the device will produce a “1” at the DQ7 output. The flowchart
for Data Polling (DQ7) is shown in “(3) Data Polling Algorithm” in ■FLOW CHART.
For programming, the Data Polling is valid after the rising edge of fourth write pulse in the four write pulse
sequence.
For chip erase and sector erase, the Data Polling is valid after the rising edge of the sixth write pulse in the six
write pulse sequence. Data Polling must be performed at sector address within any of the sectors being erased
and not a protected sector. Otherwise, the status may not be valid.
If a program address falls within a protected sector, Data Polling on DQ7 is active for approximately 1 µs, then
that bank returns to the read mode. After an erase command sequence is written, if all sectors selected for
erasing are protected, Data Polling on DQ7 is active for approximately 400 µs, then the bank returns to read mode.
Once the Embedded Algorithm operation is close to being completed, the MBM29DL16XTE/BE data pins (DQ7)
may change asynchronously while the output enable (OE) is asserted low. This means that the devices are
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SPANSION [ SPANSION ]
