AB flip-flop, a first step to multilevel sequential logic

Abstract

Although it promises many advantages, such as simpler circuits, fewer interconnections, small chip area, etc., unfortunately multilevel logic circuits have not received sufficient attention, because there is not sufficient hardware available. In particular, it is very difficult to find circuits to implement the multilevel sequential circuits. Presented is a new flip-flop circuit which is the basic building block of multilevel sequential circuits. It is shown that basic sequential circuits such as multilevel counter/dividers may be built using this circuit.

Multilevel Sequential Logic Circuit Design

“…This new flip-flop is called AB flip-flop because it has two inputs, A and B, and the transition equation which does not have inverted terms, is stated as follows [1]:…”

“…Then, the counter design work is extended to synchronous and asynchronous 2-digit modulo-16 counters. All these circuits are tested successfully [1]. A 4-level logic system is preferred (although most circuits are radix-free, minor modifications may needed to change/increase the logic levels for a 1-digit counter), in order to keep the noise margins in reasonable levels.…”