National Instruments 6612 User Manual page 32

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 2-14.
Digital Input P0.A
Digital Input P0.B
Filtered Input A
Filtered Input B
• 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 2-15.
Digital Input P0.A
Digital Input P0.B
Filtered Input A
Filtered Input B
Figure 2-14. Case 1
Stable
Filter Clock
Figure 2-15. Case 2
Not Stable
Filter Clock
Stable Stable
Not Stable
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NI 6612 User Manual