MBM29DL32XTE/BE80/90
• Write Operation Status
Detailed in “Hardware Sequence Flags” in “■ COMMAND DEFINITIONS” are all the status flags that can
determine the status of the bank for the current mode operation. The read operation from the bank where is not
operate Embedded Algorithm returns a data of memory cell. These bits offer a method for determining whether
a Embedded Algorithm is completed properly. The information on DQ2 is address sensitive. This means that if
an address from an erasing sector is consecutively read, then the DQ2 bit will toggle. However, DQ2 will not
toggle if an address from a non-erasing sector is consecutively read. This allows the user to determine which
sectors are erasing and which are not.
The status flag is not output from bank (non-busy bank) not executing Embedded Algorithm. For example, there
is bank (busy bank) which is now executing Embedded Algorithm. When the read sequence is [1] < busy
bank > , [2] < non-busy bank > , [3] < busy bank > , the DQ6 is toggling in the case of [1] and [3]. In case of [2],
the data of memory cell is outputted. In the erase-suspend read mode with the same read sequence, DQ6 will
not be toggled in the [1] and [3].
In the erase suspend read mode, DQ2 is toggled in the [1] and [3]. In case of [2], the data of memory cell is
outputted.
Hardware Sequence Flags
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
0
0
Toggle
Data
1*2
(Erase Suspended Sector)
Erase
Erase Suspend Read
Suspended
Data Data Data Data
DQ7 Toggle
(Non-Erase Suspended Sector)
In Progress Mode
Erase Suspend Program
(Non-Erase Suspended Sector)
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 causes DQ2 to toggle.
*2 : Reading from non-erase suspend sector address will indicate logic “1” at the DQ2 bit.
• DQ7
Data Polling
The MBM29DL32XTE/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
45
SPANSION [ SPANSION ]
