Indicating
Logic - Encodings
20/4/2014
CE-653 - Indicating Logic
4
}Indicating circuit
operation is two-phase:
}NULL, DATA, NULL, DATA, …
}Boolean Logic encodes two values:
}0 or 1, T or F
}We need DATA and NULL, i.e. three values
}0 or 1 or NULL, T or F or
NULL
}Simplest ternary logic is dual-rail
}Need two wires per
Boolean signal
Actual Value: x.t, x.f
Logical/Boolean
Value
00
NULL
01
0 (False)
10
1 (True)
11
Unused
}Other Encodings Possible
}1-of-n or m-of-n