HDLbits

Verification/Reading Simulations

Combinational Circuit 5

medium
trace-tablecombinational

The trace table uses four-bit hexadecimal values. Infer how the selector c chooses among the data inputs and what value is produced for the remaining selector values.

The following stimulus and observed outputs are a newly prepared trace for this exercise:

c (select) a b d e q
0 A B D E B
1 A B D E E
2 A B D E A
3 A B D E D
4–F A B D E F