© National Instruments
|
2-19
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.
Figure 2-14.
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 2-15.
Figure 2-15.
Case 2
Digit
a
l Inp
u
t P0.A
Digit
a
l Inp
u
t P0.B
Filter Clock
Filtered Inp
u
t A
Filtered Inp
u
t B
S
t
ab
le
S
t
ab
le
S
t
ab
le
Digit
a
l Inp
u
t P0.A
Digit
a
l Inp
u
t P0.B
Filter Clock
Filtered Inp
u
t A
Filtered Inp
u
t B
Not
S
t
ab
le
Not
S
t
ab
le
