Question

Explain the differences among a truth table, a state table, a characteristic table, and an excitation table

Answer 1

A state table defines the behavior of the sequential function.
Truth table gives relation between inputs and outputs.
Excitation table is used for design of flip-flops and counters.
Truth table contains inputs and excitation table takes outputs as inputs.
A characteristic table has the control input
(D or T) as the first column, the current state as the middle column, and the next state as the last column.
Basically, it tells you how the control bit affects the current state to produce the next state. An excitation table has the current state as the first column, the next state as the second column, and the control bit as the third column.
The excitation table is used to implement a Finite State Machine.

Answer 2

The differences between a truth table, a state table, a characteristic table, and an excitation table are given below.

Explanation:

• Following are the differences between a truth table, a state table, a characteristic table, and an excitation table:

Truth table:

• It explains the functionality of a given element or logic circuit.
• It does this by giving the output of a logic circuit/element for all the combinations of the input variables that are possible.
• It describes the relationship between inputs and outputs.
• Based on the input combinations, the response of the circuit can be determined by using the truth table.

State table:

• It is applicable to sequential circuits. They have different states.
• It describes the transition that takes place in the sequential circuit from one state to another state.
• It represents the relationship between the inputs, the present state, and the next states of a sequential circuit.
• In a state table, which input results in which next state for a specific current is represented in the form of a table. It is the truth table of sequential circuits.

Characteristic table:

• It provides information on the inputs of the logic circuits, the present state and the next state of the sequential circuits.
• In a characteristic table, for which particular input and present state which next state will result for the provided sequential circuit is represented.

Excitation table:

• Excitations represent inputs. Excitation Tables can also be applicable to sequential circuits.
• It provides information about the excitations that result in a state change of the sequential circuit from the present to the next state.

#SPJ2