Digital Systems: Principles and Design

453Fundamental Mode Sequential Circuits

A flow table gives the following:

A flow table gives the present state, for the different input combinations next states

(stable) and present outputs, which corresponds to ones leading to stable state. These

states exist after one or more feedback-cycles to next stable states at the memory section

after change of an input X

k

.

However the unstable states, which lead to other unstable states, are not shown in flow

table and at a table next state entry only the eventually occurring states are shown. Flow

table gives the condensed view of the circuit.

Number of columns and rows of the flow table are the same as state ...