Sequential Logic Principles

Flashcards generated based on key concepts and definitions from the lecture on Sequential Logic Principles.

Sequential Logic

A type of digital circuit in which the output depends on the sequence of past inputs as well as current inputs.

Bistable Logic Elements

Feedback sequential logic circuits that can hold two stable states.

Finite State Machine (FSM)

A computational model consisting of a finite number of states, transitions between those states, and actions.

Latch

A simple memory device that changes its output state at any time in response to input changes.

Flip-Flop

A memory device that changes its output state only at specific clock edge or pulse.

Clock Characteristics

The characteristics of a clock signal, including frequency, duty cycle, and period.

Metastability

A condition in digital circuits where the output is ambiguous and may oscillate between logic levels.

Setup Time

The minimum time before the clock edge that the data input must be held stable.

Hold Time

The minimum time after the clock edge that the data input must remain stable.

Mealy Machine

A type of state machine where the output depends on the current state and current inputs.

Moore Machine

A type of state machine where the output depends only on the current state.

Characteristic Equations

Equations that describe the next state of a flip-flop as a function of its current state and inputs.

Timing Diagram

A graphical representation of the states of a digital system over time.

State Transition Table

A table that describes the states of a system and the corresponding actions or outputs.

D Latch

A latch that stores a data bit and is transparent when the control signal is active.

S-R Latch

A type of latch that has set and reset inputs.

Timing Parameters

Characteristics such as propagation delay, minimum pulse width, setup, and hold times associated with flip-flops.

Scan Flip-Flop

A flip-flop designed for testing that can operate in two modes: normal and test.

Excitation Equations

Equations that define the input signals needed to achieve specific transitions in a flip-flop.

State Diagram

A visual representation that shows the states of a system and transitions between those states.

State Table

A table that organizes the states of a system, including current states, inputs, next states, and outputs.