Digital Systems

Chapter 18

Fundamental Mode Sequential Circuits

OBJECTIVE

In this chapter, we shall learn the asynchronous sequential circuit operations in a mode called fundamental mode—their stable and unstable states, analysis, output specifications, feedback cycles, races, race-free assignments in their design and circuit implementation.

We learnt in Chapter 15 the following concepts:

1. A sequential circuit is a circuit made up by combining the logic gates such that the required logic at the output(s) depends not only on the current input logic conditions but also on the past inputs, outputs and sequences.
2. A sequential circuit has the memory elements like flip flops and a combinational circuit(s) has no memory elements.
3. A general sequential circuit network ...