Digital Systems

Chapter 15

Sequential Circuits Analysis, State Minimization, State Assignment and Circuit Implementation

OBJECTIVE

We learnt in Chapter 14 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 clock input (or a set of inputs is used) to cause a transition to next state. The clock signal can be a gate (control) input 1 or control input 0 or a positive edge state (↑) or at the clock state or a negative edge (↓) or a positive going pulse ...