Chapter 6 Digital I/O
© National Instruments 6-27 X Series User Manual
The behavior for each transition can be thought of as a state machine. If a
line transitions and stays high for two consecutive filter clock edges, then
one of two options occurs:
• Case 1—If no transitions have occurred on the other lines, the
transition propagates on the second filtered clock edge, as shown in
Figure 6-13.
Figure 6-13. Case 1
• Case 2—If an additional line on the bus also has a transition during the
filter clock period, the change is not propagated until the next filter
clock edge, as shown in Figure 6-14.
Figure 6-14. Case 2
Digital Input P0.A
Digital Input P0.B
Filter Clock
Filtered Input A
Filtered Input B
Stable
Stable Stable
Digital Input P0.A
Digital Input P0.B
Filter Clock
Filtered Input A
Filtered Input B
Not Stable Not Stable
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