MBM29LV160TE/BE
-70/90/12
24
DQ
2
Toggle Bit II
This Toggle Bit II, along with DQ
6
, can be used to determine whether the device is in the Embedded Erase
Algorithm or in Erase Suspend.
Successive reads from the erasing sector will cause DQ
2
to toggle during the Embedded Erase Algorithm. If the
device is in the erase-suspended-read mode, successive reads from the erase-suspended sector will cause
DQ
2
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 DQ
2
.
DQ
6
is different from DQ
2
in that DQ
6
toggles only when the standard program or Erase, or Erase Suspend
Program operation is in progress.
For example, DQ
2
and DQ
6
can be used together to determine if the erase-suspend-read mode is in progress.
(DQ
2
toggles while DQ
6
does not.) See also Table 9 and Figure 11.
Furthermore, DQ
2
can also be used to determine which sector is being erased. When the device is in the erase
mode, DQ
2
toggles if this bit is read from an erasing sector.
Notes: 1. Performing successive read operations from any address will cause DQ
6
to toggle.
2. Reading the byte address being programmed while in the erase-suspend program mode will indicate
logic “1” at the DQ
2
bit. However, successive reads from the erase-suspended sector will cause DQ
2
to
toggle.
RY/BY
Ready/Busy Pin
The MBM29LV160TE/BE provides a RY/BY open-drain output pin as a way to indicate to the host system that
the Embedded Algorithms are either in progress or has been completed. If the output is low, the device is busy
with either a program or erase operation. If the output is high, the device is ready to accept any read/write or
erase operation. When the RY/BY pin is low, the devices will not accept any additional program or erase com-
mands with the exception of the Erase Suspend command. If the MBM29LV160TE/BE is placed in an Erase
Suspend mode, the RY/BY output will be high, by means of connecting with a pull-up resister to V
CC
.
During programming, the RY/BY pin is driven low after the rising edge of the fourth WE pulse. During an erase
operation, the RY/BY pin is driven low after the rising edge of the sixth WE pulse. The RY/BY pin will indicate a
busy condition during the RESET pulse. See Figures 12 and 13 for a detailed timing diagram. The RY/BY pin
is pulled high in standby mode.
Since this is an open-drain output, RY/BY pins can be tied together in parallel with a pull-up resistor to V
CC
.
Table 9 Toggle Bit Status
Mode
DQ
7
DQ
7
DQ
6
Toggle
DQ
2
1
Program
Erase
0
Toggle
Toggle
Erase Suspend Read
(Erase Suspended Sector)
(Note 1)
1
1
Toggle
Erase-Suspend Program
DQ
7
Toggle (Note 1)
1 (Note 2)