EN29LV160A
timing diagram. The DQ2 vs. DQ6 figure shows the differences between DQ2 and DQ6 in graphical
form.
Reading Toggle Bits DQ6/DQ2
Refer to Flowchart 6 for the following discussion. Whenever the system initially begins reading toggle
bit status, it must read DQ7–DQ0 at least twice in a row to determine whether a toggle bit is toggling.
Typically, a system would note and store the value of the toggle bit after the first read. After the
second read, the system would compare the new value of the toggle bit with the first. If the toggle bit
is not toggling, the device has completed the program or erase operation. The system can read array
data on DQ7–DQ0 on the following read cycle.
However, if after the initial two read cycles, the system determines that the toggle bit is still toggling,
the system also should note whether the value of DQ5 is high (see the section on DQ5). If it is, the
system should then determine again whether the toggle bit is toggling, since the toggle bit may have
stopped toggling just as DQ5 went high. If the toggle bit is no longer toggling, the device has
successfully completed the program or erase operation. If it is still toggling, the device did not
complete the operation successfully, and the system must write the reset command to return to
reading array data.
The remaining scenario is that the system initially determines that the toggle bit is toggling and DQ5
has not gone high. The system may continue to monitor the toggle bit and DQ5 through successive
read cycles, determining the status as described in the previous paragraph. Alternatively, it may
choose to perform other system tasks. In this case, the system must start at the beginning of the
algorithm when it returns to determine the status of the operation (top of Flowchart 6).
Write Operation Status
RY/BY
Operation
DQ7
DQ6
DQ5
DQ3
DQ2
#
0
0
1
Embedded Program
Algorithm
No
toggle
DQ7#
Toggle
Toggle
0
0
0
N/A
1
Standard
Mode
Embedded Erase Algorithm
0
1
Toggle
Reading within Erase
Suspended Sector
No
Toggle
N/A
Toggle
Erase
Suspend
Mode
Reading within Non-Erase
Suspended Sector
Data
Data
Data
0
Data
N/A
Data
N/A
1
0
Erase-Suspend Program
DQ7#
Toggle
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.essi.com.tw
19
Rev. I, Issue Date: 2008/07/17
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
