Introduction to Sequential Logic

Output is determined by the current state and the input. The output is fed back to the input to determine the next output.

Clock

Generates a series of pulses at regular intervals. Used to synchronize the operation of digital circuits.

Clock signal

A square wave with a 50% duty cycle. The signal is high for half the period and low for the other half.

Triggering methods

Determines when the output changes according to the clock signal.

Positive edge-triggered

Output changes on the rising edge of the clock signal.

Negative edge-triggered

Output changes on the falling edge of the clock signal.

Level Triggering

Output changes when the clock signal is high (or low).

Excitation table

A table used in sequential logic to determine the required inputs for a flip-flop to transition from its current state to a desired next state. It provides a mapping between the current state, next state, and the necessary inputs.

These tables are essential for designing and analyzing sequential circuits. They help in determining the required inputs for achieving the desired state transitions.

Latch & Flip-flop

A memory element that can store a bit.

Latch

Level triggered. Independent of a clock.

Flip-flop

Edge triggered. Dependent on a clock.