Faults and Fault Detection
Last Edit July 22, 2001
2:1 MUX Example
Figure 9-14 shows a 2:1 MUX, its equation and its existence function.
The minimal test sequence is shown in the darkened edges. The table shows
the test vector (output listed first), what is tested, and what changes
in each vector. Note that X3, the output, must always change, while only
one input is allowed to change.
Figure 9-14 2:1 Mux Test Sequence Analysis
Figure 9-15 shows the same circuit, but this time lists both of
the possible test sequences. In this case, the sequences are equal in
length and coverage (100%).
Figure 9-15 Choosing A Sequence When Two Are Available