'Master slave flip flop' diaporamas de présentation

CS/EE 3700 : Fundamentals of Digital System Design

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Chapter7 Sequential Logic Design Principles

Chapter7 Sequential Logic Design Principles. ( ???????? ). Flip-Flops. CLK. Flip-Flops ( ??? ). Positive-Edge Rising-Edge. Negative-Edge Falling-Edge. Change its outputs only at the Rising or Falling Edge of a controlling CLK signal. Flip-Flop. Classified by Function

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Overview

Overview. Logic Combinational Logic Sequential Logic Storage Devices SR Flip-Flops D Flip Flops JK Flip Flops Registers Addressing Computer Memory. Logical Completeness. Can implement ANY truth table with AND, OR, NOT. 1. AND combinations that yield a "1" in the truth table.

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Flip-Flops

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Sequential circuit

Sequential circuit. Digital electronics is classified into combinational logic and sequential logic. In combinational circuit outpus depends only on present inputs. In sequential circuit, output depends upon both present and previous inputs/outputs.

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Flip-Flops

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CMOS SEQUENTIAL CIRCUIT DESIGN

CMOS SEQUENTIAL CIRCUIT DESIGN. Integrated Circuits Spring 2001 Dept. of ECE University of Seoul. Combinational vs. Sequential Logic. ? Combinational Logic OUT(t) ? IN(t). ? Sequential Logic OUT(t) ? IN(t) ? IN(t-kT) ? OUT(t-kT). ? Positive Feedback ? Charge on Cap.

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Chapter 3 Continued

Chapter 3 Continued. Logic Gates Logic Chips Combinational Logic Timing Sequential Logic Flip Flops Registers Memory State Machines. Logical Completeness. Can implement ANY truth table with AND, OR, NOT. 1. AND combinations that yield a "1" in the truth table.

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Excitation Vectors

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JK Flip-Flop

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SYEN 3330 Digital Systems

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TRIGGERING OF FLIP-FLOPS

TRIGGERING OF FLIP-FLOPS FLIP - FLOPS CHANGE STATE ONLY WHEN A CLOCK SIGNAL IS PRESENT. CLOCK SIGNAL IS NOT NECESSARILY INSTANTANEOUS SO THERE NEEDS TO BE A WAY TO PREVENT THE FLIP-FLOP FROM CHANGING STATE MULTIPLE TIMES DURING A CLOCK CYCLE. 2 WAYS TO ACHIEVE THIS :

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