Introduction to Sequential Logic Design Flip-flops.

Introduction to Sequential Logic Design

Flip-flops

Prev…

Latches S-R S-bar-R-bar S-R with enable signal D

FF vs. Latch

Latches and flip-flops (FFs) are the basic building blocks of sequential circuits.

latch: bistable memory device with level sensitive triggering (no clock), watches all of its inputs continuously and changes its outputs, independent of a clocking signal.

flip-flop: bistable memory device with edge-triggering (with clock), samples its inputs, and changes its output only at times determined by a clocking signal.

Edge triggered D Flip-Flop

A D FF combines a pair of D latches. Master/slave

D FF Positive-edge-triggered D FF Negative-edge-triggered D FF Edge-Triggered D FF with Enable Scan FF

Positive-Edge-triggered D flip-flop

Dynamic-input indicator

Edge-triggered D flip-flop behavior

D flip-flop timing parameters

Propagation delay (from CLK) Setup time (D before CLK) Hold time (D after CLK)

D FF with asynchronous inputs

Force the D FF to a particular state independent of the CLK and D inputs. PR (Preset) and CLR (Clear)

Negative-edge triggered D FF

Simply inverts the clock input. Active low.

Negative-edge triggered D FF

Simply inverts the clock input. Active low.

J-K flip-flops

T (toggle) flip-flops

A T FF changes state on every tick of the clock. (be toggled on every tick) Q has precisely half the frequency of the T. Important for counters Positive-edge-triggered T FF

How to build T FF using J-K FF and D FF?

T (toggle) flip-flops with enable

How to build a T FF with enable using? D FF J-K FF

T (toggle) flip-flops with enable

Next…

FSM analysisRead Ch-7.3

Introduction to Sequential Logic Design Flip-flops.

Documents

Transcript of Introduction to Sequential Logic Design Flip-flops.

1 Sequential Circuits Registers and Counters. 2 Master Slave Flip Flops.

Test #2 Combinational Circuits – MUX Sequential Circuits – Latches – Flip-flops – Clocked Sequential Circuits – Registers/Shift Register – Counters – Memory.

241-208 CH71 Chapter 5 Sequential Circuits: Flip-Flops and Counter By Taweesak Reungpeerakul.

Chapter 5 Chapter 5 –– Flip Flops Sequential Flip Flops ...alaraje/Spring2009/EET2411/... · • We now introduce the concept of memory . The flip-flop, abbreviated FF, is a key

SEQUENTIAL CIRCUITS Component Design and Use. Register with Parallel Load Register: Group of Flip-Flops Ex: D Flip-Flops Holds a Word of Data

Unit-5. Flip Flops & Sequential Logic Circuits

Overview Logic Combinational Logic Sequential Logic Storage Devices SR Flip-Flops D Flip Flops JK Flip Flops Registers Addressing Computer Memory.

Lecture 7 – Flip-Flops and Sequential Circuit Design

Flip-Flops - University of Pittsburghkmram/0132/lectures/latches+flip-flops.pdfElec 326 1 Flip-Flops Flip-Flops Objectives This section is the first dealing with sequential circuits.

EXPERIMENT 8. Flip-Flops and Sequential Circuits

Lecture #11: Sequential Logic: Latches and Flip-flops€¦ · Lecture 11: Sequential Logic Latches & Flip-flops Introduction Memory Elements Pulse-Triggered Latch S-R Latch Gated

Sequential logic circuits. CS 3402--Digital LogicSequential logic circuits2 Outline Sequential Circuit Models –Asynchronous –Synchronous Latches Flip-Flops.

Topic: Sequential Circuits, Latches and Flip flops UNIT IV ...

Outline – Sequential Circuits q Introduction Flip-Flops RS Flip-Flop

L7 - Flip-Flops and Sequential Circuit Design [PDF Search Engine]

Digital Design: Sequential logic, Latches and Flip-Flops Part - II

Digital Design: Sequential logic, Latches and Flip-Flops Part - IV

Sequential Circuits & Flip-Flops

Latches and Flip-Flops - Docceptor.net•Storage elements in clocked sequential circuits are called flip-flops, which is a binary storage device storing one bit. •Flip-flop updates

Sequential Circuit - Counter -. INTRODUCTION A counter – a group of flip-flops connected together to perform counting operations. The number of flip-flops.