Unit 9 Latches and Flip-Flops. Dept. of Electrical and Computer Eng., NCTU 1
|
|
|
- Sara Harrison
- 6 years ago
- Views:
Transcription
1 Unit 9 Latches and Flip-Flops Dept. of Electrical and Computer Eng., NCTU 1
2 9.1 Introduction Dept. of Electrical and Computer Eng., NCTU 2
3 What is the characteristic of sequential circuits in contrast to combinational circuits? The output of a sequential circuit depends not only on the present input, but also on the past sequence of inputs In effect, sequential circuits are able to remember the past history of inputs Two of the commonly used memory devices in sequential circuits are latches and flip-flops Flip-flops change states in response to a clock input, however latches change states in response to data inputs Either latches of flip-flops are formed through feedbacks Dept. of Electrical and Computer Eng., NCTU 3
4 A unstable feedback A bi-stable feedback How do we control stable outputs? Dept. of Electrical and Computer Eng., NCTU 4
5 9.2 Set-Reset Latch Dept. of Electrical and Computer Eng., NCTU 5
6 Introducing control inputs to a feedback circuit S R Q P Q n-1 P n /1 0/1 Unstable when S and R both switch from 1 to 0 simultaneously Dept. of Electrical and Computer Eng., NCTU 6
7 The response time of a latch The duration of the S (or R) input pulse must be longer than in order for a change in the state of Q to occur Dept. of Electrical and Computer Eng., NCTU 7
8 We use the term present state to mean the state of Q at the time the inputs are applied, and the term next state to mean the state of Q after the latch or flip-flop has reacted to the inputs 0 1 Characteristic Equation Q(t +ε) =S(t) + R(t) Q(t) Dept. of Electrical and Computer Eng., NCTU 8
9 Debouncing circuit with a S-R latch When a mechanical switch is opened or closed, the switch contacts tend to vibrate or bounce open or closed several times before settling down to their final positions Dept. of Electrical and Computer Eng., NCTU 9
10 9.3 Gated D Latch Dept. of Electrical and Computer Eng., NCTU 10
11 A gated D latch has two inputs- a data input (D) and a gate input (G). When G = 0, the output Q doesn t change. When G=1, the Q output follows the D input Dept. of Electrical and Computer Eng., NCTU 11
12 The symbol and the truth table for gated D-latch Dept. of Electrical and Computer Eng., NCTU 12
13 9.4 Edge-Trigged D Flip-Flop Dept. of Electrical and Computer Eng., NCTU 13
14 The output of a D flip-flop (FF) changes only in response to a clock, not a change in D A D flip-flop has two inputs, D (data) and Ck (clock) A D-FF is said to be triggered on the rising edge of the clock if the output can change in response to the 0-to-1 transition on the clock input If the output can change upon the 1-to-0 clock transition, then the D-FF is said to be triggered on the falling edge Dept. of Electrical and Computer Eng., NCTU 14
15 The timing diagram for a falling-edge-triggered D-FF Dept. of Electrical and Computer Eng., NCTU 15
16 A rising-edge-triggered D-FF Dept. of Electrical and Computer Eng., NCTU 16
17 In order to function properly, the D input to a edgetriggered FF must be held constant for a period of time before and after the active edge of the clock If D changes at the same time as the active edge, the behavior is unpredictable Setup time Hold time Propagation delay Dept. of Electrical and Computer Eng., NCTU 17
18 The minimum clock period Dept. of Electrical and Computer Eng., NCTU 18
19 9.5 S-R Flip-Flop Dept. of Electrical and Computer Eng., NCTU 19
20 A S-R FF is similar to a S-R latch in that S=1 sets Q to 1, and R=1 set Q to 0. The difference is that the flip-flop has a clock input Dept. of Electrical and Computer Eng., NCTU 20
21 The master-slave S-R FF Dept. of Electrical and Computer Eng., NCTU 21
22 There is a subtle difference between the master-slave and the edge-trigged flip-flop For a rising-edge-triggered flip-flop, the value of the input is sensed at the rising edge of the clock, and the input can change while the clock is low For the master-slave flip-flop, if the input change while the clock is low, the flip-flop output may be incorrect See an example in the previous page The problem can be solved if we only allow the S and R inputs to change while the clock is high Dept. of Electrical and Computer Eng., NCTU 22
23 9.6 J-K Flip-Flop Dept. of Electrical and Computer Eng., NCTU 23
24 J-K flip-flop is an extended version of the S-R flip-flop The J-K FF has three inputs, J, K and clock: J corresponds to S and K corresponds to K Unlike the S-R FF, a 1 input may be applied simultaneously to J and K. Q Q when J=K=1 Dept. of Electrical and Computer Eng., NCTU 24
25 The timing diagram of J-K FF Dept. of Electrical and Computer Eng., NCTU 25
26 The master-slave J-K FF S= JQ Clk and R=KQClk, only one of S and R inputs to the first latch can be 1 at any given time Notice that a master-slave FF is different from the edgetrigged FF Dept. of Electrical and Computer Eng., NCTU 26
27 9.7 T Flip-Flop Dept. of Electrical and Computer Eng., NCTU 27
28 The T flip-flop is also called the toggle flip-flop When T=1, the flip-flop changes state after the active edge of the clock. When T=0, no state change occurs Dept. of Electrical and Computer Eng., NCTU 28
29 Two common methods to implement a T-FF (a) Conversion of J-K to T (b) Conversion of D to T, D=T Q Dept. of Electrical and Computer Eng., NCTU 29
30 9.8 Flip-Flops with Additional Inputs Dept. of Electrical and Computer Eng., NCTU 30
31 Flip-flop with clear and preset inputs A logic 0 applied to ClrN will reset Q to 0 A logic o applied to PreN will set Q to 1 ClrN and PreN are often referred to as asynchronous clear and preset inputs Dept. of Electrical and Computer Eng., NCTU 31
32 The operation of the clear and preset inputs Dept. of Electrical and Computer Eng., NCTU 32
33 When designing a synchronous system, we frequently encounter situations where we want some flip-flops to hold existing data even if the data input to the flip-flops may be changing. There are two approaches: Gating the clock may results in loss of synchronization A flip-flop with clock enable cost extra power Dept. of Electrical and Computer Eng., NCTU 33
DIGITAL CIRCUIT LOGIC UNIT 11: SEQUENTIAL CIRCUITS (LATCHES AND FLIP-FLOPS)
DIGITAL CIRCUIT LOGIC UNIT 11: SEQUENTIAL CIRCUITS (LATCHES AND FLIP-FLOPS) 1 iclicker Question 16 What should be the MUX inputs to implement the following function? (4 minutes) f A, B, C = m(0,2,5,6,7)
Switching Circuits & Logic Design
Switching Circuits & Logic Design Jie-Hong oland Jiang 江介宏 Department of Electrical Engineering National Taiwan University Fall 22 Latches and Flip-Flops http://www3.niaid.nih.gov/topics/malaria/lifecycle.htm
CHAPTER 11 LATCHES AND FLIP-FLOPS
CHAPTER 11 1/25 LATCHES AND FLIP-FLOPS This chapter in the book includes: Objectives Study Guide 11.1 Introduction 11.2 Set-Reset Latch 11.3 Gated D Latch 11.4 Edge-Triggered D Flip-Flop 11.5 S-R Flip-Flop
Unit 11. Latches and Flip-Flops
Unit 11 Latches and Flip-Flops 1 Combinational Circuits A combinational circuit consists of logic gates whose outputs, at any time, are determined by combining the values of the inputs. For n input variables,
UNIT 11 LATCHES AND FLIP-FLOPS
UNIT 11 LATCHE AN FLIP-FLOP pring 2011 Latches and Flip-Flops 2 Contents et-eset latch Gated latch Edge-triggered flip-flop - flip-flop J-K flip-flop T flip-flop Flip-flops with additional inputs eading
Digital Logic Design Sequential Circuits. Dr. Basem ElHalawany
Digital Logic Design Sequential Circuits Dr. Basem ElHalawany Combinational vs Sequential inputs X Combinational Circuits outputs Z A combinational circuit: At any time, outputs depends only on inputs
INTRODUCTION TO SEQUENTIAL CIRCUITS
NOTE: Explanation Refer Class Notes Digital Circuits(15EECC203) INTRODUCTION TO SEQUENTIAL CIRCUITS by Nagaraj Vannal, Asst.Professor, School of Electronics Engineering, K.L.E. Technological University,
ELCT201: DIGITAL LOGIC DESIGN
ELCT201: DIGITAL LOGIC DESIGN Dr. Eng. Haitham Omran, haitham.omran@guc.edu.eg Dr. Eng. Wassim Alexan, wassim.joseph@guc.edu.eg Lecture 6 Following the slides of Dr. Ahmed H. Madian ذو الحجة 1438 ه Winter
Sequential Logic. E&CE 223 Digital Circuits and Systems (A. Kennings) Page 1
Sequential Logic E&CE 223 igital Circuits and Systems (A. Kennings) Page 1 Sequential Circuits Have considered only combinational circuits in which circuit outputs are determined entirely by current circuit
ELCT201: DIGITAL LOGIC DESIGN
ELCT201: DIGITAL LOGIC DESIGN Dr. Eng. Haitham Omran, haitham.omran@guc.edu.eg Dr. Eng. Wassim Alexan, wassim.joseph@guc.edu.eg Lecture 7 Following the slides of Dr. Ahmed H. Madian محرم 1439 ه Winter
Lecture 8: Sequential Logic
Lecture 8: Sequential Logic Last lecture discussed how we can use digital electronics to do combinatorial logic we designed circuits that gave an immediate output when presented with a given set of inputs
Chapter 6. Flip-Flops and Simple Flip-Flop Applications
Chapter 6 Flip-Flops and Simple Flip-Flop Applications Basic bistable element It is a circuit having two stable conditions (states). It can be used to store binary symbols. J. C. Huang, 2004 Digital Logic
Switching Circuits & Logic Design
witching Circuits & Logic esign Jie-Hong oland Jiang 江介宏 epartment of Electrical Engineering National Taiwan University Fall 24 Latches and Flip-Flops http://www3.niaid.nih.gov/topics/malaria/lifecycle.htm
Flip-Flops. Because of this the state of the latch may keep changing in circuits with feedback as long as the clock pulse remains active.
Flip-Flops Objectives The objectives of this lesson are to study: 1. Latches versus Flip-Flops 2. Master-Slave Flip-Flops 3. Timing Analysis of Master-Slave Flip-Flops 4. Different Types of Master-Slave
Logic Design. Flip Flops, Registers and Counters
Logic Design Flip Flops, Registers and Counters Introduction Combinational circuits: value of each output depends only on the values of inputs Sequential Circuits: values of outputs depend on inputs and
EMT 125 Digital Electronic Principles I CHAPTER 6 : FLIP-FLOP
EMT 125 Digital Electronic Principles I CHAPTER 6 : FLIP-FLOP 1 Chapter Overview Latches Gated Latches Edge-triggered flip-flops Master-slave flip-flops Flip-flop operating characteristics Flip-flop applications
Chapter. Synchronous Sequential Circuits
Chapter 5 Synchronous Sequential Circuits Logic Circuits- Review Logic Circuits 2 Combinational Circuits Consists of logic gates whose outputs are determined from the current combination of inputs. Performs
Chapter 1: Switching Algebra Chapter 2: Logical Levels, Timing & Delays. Introduction to latches Chapter 9: Binary Arithmetic
12.12.216 Chapter 5 Flip Flops Dr.-ng. Stefan Werner /14 Table of content Chapter 1: Switching Algebra Chapter 2: Logical Levels, Timing & Delays Chapter 3: Karnaugh-Veitch-Maps Chapter 4: Combinational
Introduction to Sequential Circuits
Introduction to Sequential Circuits COE 202 Digital Logic Design Dr. Muhamed Mudawar King Fahd University of Petroleum and Minerals Presentation Outline Introduction to Sequential Circuits Synchronous
CH 11 Latches and Flip-Flops
CH Latches and Flip-Flops Flops Lecturer : 吳安宇 Date : 25.2.2 Ver.. ACCESS IC LAB v. Introduction v.2 Set-Reset Latch v.3 Gated D Latch Outline v.4 Edge-Triggered D Flip-Flop v.5 S-R Flip-Flop v.6 J-K Flip-Flop
Other Flip-Flops. Lecture 27 1
Other Flip-Flops Other types of flip-flops can be constructed by using the D flip-flop and external logic. Two flip-flops less widely used in the design of digital systems are the JK and T flip-flops.
RS flip-flop using NOR gate
RS flip-flop using NOR gate Triggering and triggering methods Triggering : Applying train of pulses, to set or reset the memory cell is known as Triggering. Triggering methods:- There are basically two
RS flip-flop using NOR gate
RS flip-flop using NOR gate Triggering and triggering methods Triggering : Applying train of pulses, to set or reset the memory cell is known as Triggering. Triggering methods:- There are basically two
Chapter 5 Synchronous Sequential Logic
Chapter 5 Synchronous Sequential Logic Chih-Tsun Huang ( 黃稚存 ) http://nthucad.cs.nthu.edu.tw/~cthuang/ Department of Computer Science National Tsing Hua University Outline Introduction Storage Elements:
COE 202: Digital Logic Design Sequential Circuits Part 1. Dr. Ahmad Almulhem ahmadsm AT kfupm Phone: Office:
COE 202: Digital Logic Design Sequential Circuits Part 1 Dr. Ahmad Almulhem Email: ahmadsm AT kfupm Phone: 860-7554 Office: 22-324 Objectives Sequential Circuits Memory Elements Latches Flip-Flops Combinational
(CSC-3501) Lecture 7 (07 Feb 2008) Seung-Jong Park (Jay) CSC S.J. Park. Announcement
Seung-Jong Park (Jay) http://www.csc.lsu.edu/~sjpark Computer Architecture (CSC-3501) Lecture 7 (07 Feb 2008) 1 Announcement 2 1 Combinational vs. Sequential Logic Combinational Logic Memoryless Outputs
EET2411 DIGITAL ELECTRONICS
5-8 Clocked D Flip-FlopFlop One data input. The output changes to the value of the input at either the positive going or negative going clock trigger. May be implemented with a J-K FF by tying the J input
D Latch (Transparent Latch)
D Latch (Transparent Latch) -One way to eliminate the undesirable condition of the indeterminate state in the SR latch is to ensure that inputs S and R are never equal to 1 at the same time. This is done
Chapter 5: Synchronous Sequential Logic
Chapter 5: Synchronous Sequential Logic NCNU_2016_DD_5_1 Digital systems may contain memory for storing information. Combinational circuits contains no memory elements the outputs depends only on the inputs
PRE J. Figure 25.1a J-K flip-flop with Asynchronous Preset and Clear inputs
Asynchronous Preset and Clear Inputs The S-R, J-K and D inputs are known as synchronous inputs because the outputs change when appropriate input values are applied at the inputs and a clock signal is applied
6. Sequential Logic Flip-Flops
ection 6. equential Logic Flip-Flops Page of 5 6. equential Logic Flip-Flops ombinatorial components: their output values are computed entirely from their present input values. equential components: their
cascading flip-flops for proper operation clock skew Hardware description languages and sequential logic
equential logic equential circuits simple circuits with feedback latches edge-triggered flip-flops Timing methodologies cascading flip-flops for proper operation clock skew Basic registers shift registers
Flip-Flops and Sequential Circuit Design
Flip-Flops and Sequential Circuit Design ECE 52 Summer 29 Reading ssignment Brown and Vranesic 7 Flip-Flops, Registers, Counters and a Simple Processor 7.5 T Flip-Flop 7.5. Configurable Flip-Flops 7.6
ELE2120 Digital Circuits and Systems. Tutorial Note 7
ELE2120 Digital Circuits and Systems Tutorial Note 7 Outline 1. Sequential Circuit 2. Gated SR Latch 3. Gated D-latch 4. Edge-Triggered D Flip-Flop 5. Asynchronous and Synchronous reset Sequential Circuit
Digital Fundamentals: A Systems Approach
Digital Fundamentals: A Systems Approach Latches, Flip-Flops, and Timers Chapter 6 Traffic Signal Control Traffic Signal Control: State Diagram Traffic Signal Control: Block Diagram Traffic Signal Control:
ECE 341. Lecture # 2
ECE 341 Lecture # 2 Instructor: Zeshan Chishti zeshan@pdx.edu October 1, 2014 Portland State University Announcements Course website reminder: http://www.ece.pdx.edu/~zeshan/ece341.htm Homework 1: Will
Sequential Circuits: Latches & Flip-Flops
Sequential Circuits: Latches & Flip-Flops Overview Storage Elements Latches SR, JK, D, and T Characteristic Tables, Characteristic Equations, Eecution Tables, and State Diagrams Standard Symbols Flip-Flops
Synchronous Sequential Logic
Synchronous Sequential Logic -A Sequential Circuit consists of a combinational circuit to which storage elements are connected to form a feedback path. The storage elements are devices capable of storing
Engr354: Digital Logic Circuits
Engr354: igital Circuits Chapter 7 Sequential Elements r. Curtis Nelson Sequential Elements In this chapter you will learn about: circuits that can store information; Basic cells, latches, and flip-flops;
Introduction. NAND Gate Latch. Digital Logic Design 1 FLIP-FLOP. Digital Logic Design 1
2007 Introduction BK TP.HCM FLIP-FLOP So far we have seen Combinational Logic The output(s) depends only on the current values of the input variables Here we will look at Sequential Logic circuits The
Chapter 11 Latches and Flip-Flops
Chapter 11 Latches and Flip-Flops SKEE1223 igital Electronics Mun im/arif/izam FKE, Universiti Teknologi Malaysia ecember 8, 2015 Types of Logic Circuits Combinational logic: Output depends solely on the
A clock is a free-running signal with a cycle time. A clock may be either high or low, and alternates between the two states.
Clocks A clock is a free-running signal with a cycle time. A clock may be either high or low, and alternates between the two states. 1 The length of time the clock is high before changing states is its
The NOR latch is similar to the NAND latch
5-2 NOR Gate Latch The NOR latch is similar to the NAND latch except that the Q and Q outputs are reversed. The set and clear inputs are active high, that is, the output will change when the input is pulsed
Experiment 8 Introduction to Latches and Flip-Flops and registers
Experiment 8 Introduction to Latches and Flip-Flops and registers Introduction: The logic circuits that have been used until now were combinational logic circuits since the output of the device depends
Sequential Design Basics
Sequential Design Basics Lecture 2 topics A review of devices that hold state A review of Latches A review of Flip-Flops Unit of text Set-Reset Latch/Flip-Flops/D latch/ Edge triggered D Flip-Flop 8/22/22
CHAPTER 1 LATCHES & FLIP-FLOPS
CHAPTER 1 LATCHES & FLIP-FLOPS 1 Outcome After learning this chapter, student should be able to; Recognize the difference between latches and flipflops Analyze the operation of the flip flop Draw the output
Digital Circuits ECS 371
igital Circuits ECS 371 r. Prapun Suksompong prapun@siit.tu.ac.th Lecture 17 Office Hours: BK 3601-7 Monday 9:00-10:30, 1:30-3:30 Tuesday 10:30-11:30 1 Announcement Reading Assignment: Chapter 7: 7-1,
Digital Design, Kyung Hee Univ. Chapter 5. Synchronous Sequential Logic
Chapter 5. Synchronous Sequential Logic 1 5.1 Introduction Electronic products: ability to send, receive, store, retrieve, and process information in binary format Dependence on past values of inputs Sequential
The outputs are formed by a combinational logic function of the inputs to the circuit or the values stored in the flip-flops (or both).
1 The outputs are formed by a combinational logic function of the inputs to the circuit or the values stored in the flip-flops (or both). The value that is stored in a flip-flop when the clock pulse occurs
Clocks. Sequential Logic. A clock is a free-running signal with a cycle time.
Clocks A clock is a free-running signal with a cycle time. A clock may be either high or low, and alternates between the two states. The length of time the clock is high before changing states is its high
Sequential Circuits. Output depends only and immediately on the inputs Have no memory (dependence on past values of the inputs)
Sequential Circuits Combinational circuits Output depends only and immediately on the inputs Have no memory (dependence on past values of the inputs) Sequential circuits Combination circuits with memory
12/31/2010. Overview. 12-Latches and Flip Flops Text: Unit 11. Sequential Circuits. Sequential Circuits. Feedback. Feedback
2/3/2 Overview 2-atches and Flip Flops Text: Unit equential Circuits et/eset atch Flip-Flops ECEG/IC 2 igital Operations and Computations Winter 2 r. ouie 2 equential Circuits equential circuits: Output
Rangkaian Sekuensial. Flip-flop
Rangkaian Sekuensial Rangkaian Sekuensial Flip-flop Combinational versus Sequential Functions Logic functions are categorized as being either combinational (sometimes referred to as combinatorial) or sequential.
CHAPTER 4: Logic Circuits
CHAPTER 4: Logic Circuits II. Sequential Circuits Combinational circuits o The outputs depend only on the current input values o It uses only logic gates, decoders, multiplexers, ALUs Sequential circuits
CMSC 313 Preview Slides
CMSC 33 Preview Slides These are draft slides. The actual slides presented in lecture may be different due to last minute changes, schedule slippage,... UMBC, CMSC33, Richard Chang CMSC
L4: Sequential Building Blocks (Flip-flops, Latches and Registers)
L4: Sequential Building Blocks (Flip-flops, Latches and Registers) Acknowledgements: Lecture material adapted from R. Katz, G. Borriello, Contemporary Logic esign (second edition), Prentice-Hall/Pearson
Sequential Logic Circuits
Sequential Logic Circuits By Dr. M. Hebaishy Digital Logic Design Ch- Rem.!) Types of Logic Circuits Combinational Logic Memoryless Outputs determined by current values of inputs Sequential Logic Has memory
LAB 7. Latches & Flip Flops
بسام عب د الكريم جاد هللا النبريص Bass am Ak J Alnabr iss Islamic University of Gaza Faculty of Engineering Computer Engineering Dept. Digital Design Lab : ECOM 2112 Fall 2016 Eng. Bassam Nabriss LAB 7
3 Flip-Flops. The latch is a logic block that has 2 stable states (0) or (1). The RS latch can be forced to hold a 1 when the Set line is asserted.
3 Flip-Flops Flip-flops and latches are digital memory circuits that can remain in the state in which they were set even after the input signals have been removed. This means that the circuits have a memory
Sequential Digital Design. Laboratory Manual. Experiment #3. Flip Flop Storage Elements
The Islamic University of Gaza Engineering Faculty Department of Computer Engineering Spring 2018 ECOM 2022 Khaleel I. Shaheen Sequential Digital Design Laboratory Manual Experiment #3 Flip Flop Storage
CHAPTER 4: Logic Circuits
CHAPTER 4: Logic Circuits II. Sequential Circuits Combinational circuits o The outputs depend only on the current input values o It uses only logic gates, decoders, multiplexers, ALUs Sequential circuits
Asynchronous (Ripple) Counters
Circuits for counting events are frequently used in computers and other digital systems. Since a counter circuit must remember its past states, it has to possess memory. The chapter about flip-flops introduced
YEDITEPE UNIVERSITY DEPARTMENT OF COMPUTER ENGINEERING. EXPERIMENT VIII: FLIP-FLOPS, COUNTERS 2014 Fall
YEDITEPE UNIVERSITY DEPARTMENT OF COMPUTER ENGINEERING EXPERIMENT VIII: FLIP-FLOPS, COUNTERS 2014 Fall Objective: - Dealing with the operation of simple sequential devices. Learning invalid condition in
Introduction to Microprocessor & Digital Logic
ME262 Introduction to Microprocessor & Digital Logic (Sequential Logic) Summer 2 Sequential Logic Definition The output(s) of a sequential circuit depends d on the current and past states of the inputs,
Figure 1 shows a simple implementation of a clock switch, using an AND-OR type multiplexer logic.
1. CLOCK MUXING: With more and more multi-frequency clocks being used in today's chips, especially in the communications field, it is often necessary to switch the source of a clock line while the chip
Sri Vidya College of Engineering And Technology. Virudhunagar Department of Electrical and Electronics Engineering
Sri Vidya College of Engineering And Technology Virudhunagar 626 005 Department of Electrical and Electronics Engineering Year/ Semester/ Class : II/ III/ EEE Academic Year: 2017-2018 Subject Code/ Name:
Digital Logic Design I
Digital Logic Design I Synchronous Sequential Logic Mustafa Kemal Uyguroğlu Sequential Circuits Asynchronous Inputs Combinational Circuit Memory Elements Outputs Synchronous Inputs Combinational Circuit
EEE2135 Digital Logic Design Chapter 6. Latches/Flip-Flops and Registers/Counters 서강대학교 전자공학과
EEE235 Digital Logic Design Chapter 6. Latches/Flip-Flops and Registers/Counters 서강대학교 전자공학과 . Delay and Latches ) Signal Storage a. as voltage level static memory b. as charges dynamic memory 2) Delays
More on Flip-Flops Digital Design and Computer Architecture: ARM Edition 2015 Chapter 3 <98> 98
More on Flip-Flops Digital Design and Computer Architecture: ARM Edition 2015 Chapter 3 98 Review: Bit Storage SR latch S (set) Q R (reset) Level-sensitive SR latch S S1 C R R1 Q D C S R D latch Q
Chapter 5 Flip-Flops and Related Devices
Chapter 5 Flip-Flops and Related Devices Chapter 5 Objectives Selected areas covered in this chapter: Constructing/analyzing operation of latch flip-flops made from NAND or NOR gates. Differences of synchronous/asynchronous
Flip-Flops and Registers
The slides included herein were taken from the materials accompanying Fundamentals of Logic Design, 6 th Edition, by Roth and Kinney, and were used with permission from Cengage Learning. Flip-Flops and
Synchronous Sequential Logic. Chapter 5
Synchronous Sequential Logic Chapter 5 5-1 Introduction Combinational circuits contains no memory elements the outputs depends on the inputs Synchronous Sequential Logic 5-2 5-2 Sequential Circuits Sequential
LATCHES & FLIP-FLOP. Chapter 7
LATCHES & FLIP-FLOP Chapter 7 INTRODUCTION Latch and flip flops are categorized as bistable devices which have two stable states,called SET and RESET. They can retain either of this states indefinitely
Part II. Chapter2: Synchronous Sequential Logic
課程名稱 : 數位系統設計導論 P-/77 Part II Chapter2: Synchronous Sequential Logic 教師 : 郭峻因教授 INSTRUCTOR: Prof. Jiun-In Guo E-mail: jiguo@cs.ccu.edu.tw 課程名稱 : 數位系統設計導論 P-2/77 Special thanks to Prof. CHING-LING SU for
MC9211 Computer Organization
MC9211 Computer Organization Unit 2 : Combinational and Sequential Circuits Lesson2 : Sequential Circuits (KSB) (MCA) (2009-12/ODD) (2009-10/1 A&B) Coverage Lesson2 Outlines the formal procedures for the
10.1 Sequential logic circuits are a type of logic circuit where the output of the circuit depends not only on
CALIFORNIA STATE UNIVERSITY LOS ANGELES Department of Electrical and Computer Engineering EE-2449 Digital Logic Lab EXPERIMENT 10 INTRODUCTION TO SEQUENTIAL LOGIC EE 2449 Experiment 10 nwp & jgl 1/1/18
DIGITAL SYSTEM FUNDAMENTALS (ECE421) DIGITAL ELECTRONICS FUNDAMENTAL (ECE422) LATCHES and FLIP-FLOPS
COURSE / CODE DIGITAL SYSTEM FUNDAMENTALS (ECE421) DIGITAL ELECTRONICS FUNDAMENTAL (ECE422) LATCHES and FLIP-FLOPS In the same way that logic gates are the building blocks of combinatorial circuits, latches
Latches, Flip-Flops, and Registers. Dr. Ouiem Bchir
Latches, Flip-Flops, and Registers (Chapter #7) Dr. Ouiem Bchir The slides included herein were taken from the materials accompanying Fundamentals of Logic Design, 6 th Edition, by Roth and Kinney. Sequential
Combinational vs Sequential
Combinational vs Sequential inputs X Combinational Circuits outputs Z A combinational circuit: At any time, outputs depends only on inputs Changing inputs changes outputs No regard for previous inputs
SEQUENTIAL LOGIC. Satish Chandra Assistant Professor Department of Physics P P N College, Kanpur
SEQUENTIAL LOGIC Satish Chandra Assistant Professor Department of Physics P P N College, Kanpur www.satish0402.weebly.com OSCILLATORS Oscillators is an amplifier which derives its input from output. Oscillators
Counters
Counters A counter is the most versatile and useful subsystems in the digital system. A counter driven by a clock can be used to count the number of clock cycles. Since clock pulses occur at known intervals,
ESE 570 STATIC SEQUENTIAL CMOS LOGIC CELLS. Kenneth R. Laker, University of Pennsylvania, updated 25Mar15
ESE 570 STATIC SEQUENTIAL CMOS LOGIC CELLS 1 Classes of Logic Circuits two stable op. pts. Latch level triggered. Flip-Flop edge triggered. one stable op. pt. One-shot single pulse output no stable op.
Name Of The Experiment: Sequential circuit design Latch, Flip-flop and Registers
EEE 304 Experiment No. 07 Name Of The Experiment: Sequential circuit design Latch, Flip-flop and Registers Important: Submit your Prelab at the beginning of the lab. Prelab 1: Construct a S-R Latch and
Chapter 8 Sequential Circuits
Philadelphia University Faculty of Information Technology Department of Computer Science Computer Logic Design By 1 Chapter 8 Sequential Circuits 1 Classification of Combinational Logic 3 Sequential circuits
Flip-Flops and Related Devices. Wen-Hung Liao, Ph.D. 4/11/2001
Flip-Flops and Related Devices Wen-Hung Liao, Ph.D. 4/11/2001 Objectives Recognize the various IEEE/ANSI flip-flop symbols. Use state transition diagrams to describe counter operation. Use flip-flops in
Slide Set 7. for ENEL 353 Fall Steve Norman, PhD, PEng. Electrical & Computer Engineering Schulich School of Engineering University of Calgary
Slide Set 7 for ENEL 353 Fall 216 Steve Norman, PhD, PEng Electrical & Computer Engineering Schulich School of Engineering University of Calgary Fall Term, 216 SN s ENEL 353 Fall 216 Slide Set 7 slide
Last time, we saw how latches can be used as memory in a circuit
Flip-Flops Last time, we saw how latches can be used as memory in a circuit Latches introduce new problems: We need to know when to enable a latch We also need to quickly disable a latch In other words,
Synchronous Sequential Logic
Synchronous Sequential Logic Ranga Rodrigo August 2, 2009 1 Behavioral Modeling Behavioral modeling represents digital circuits at a functional and algorithmic level. It is used mostly to describe sequential
Chapter 5 Synchronous Sequential Logic
EEA051 - Digital Logic 數位邏輯 Chapter 5 Synchronous Sequential Logic 吳俊興國立高雄大學資訊工程學系 December 2005 Chapter 5 Synchronous Sequential Logic 5-1 Sequential Circuits 5-2 Latches 5-3 Flip-Flops 5-4 Analysis of
Chapter 5 Sequential Circuits
Logic and Computer Design Fundamentals Chapter 5 Sequential Circuits Part 2 Sequential Circuit Design Charles Kime & Thomas Kaminski 28 Pearson Education, Inc. (Hyperlinks are active in View Show mode)
EE 109 Homework 6 State Machine Design Name: Score:
EE 9 Homework 6 State Machine esign Name: Score: ue: See Blackboard Blackboard ONLY Submission. While the Blackboard submission may not require you to go through all the design steps (such as drawing out
Chapter 6 Digital Circuit 6-5 Department of Mechanical Engineering
MEMS1082 Chapter 6 Digital Circuit 6-5 General digital system D Flip-Flops, The D flip-flop is a modification of the clocked SR flip-flop. The D input goes directly into the S input and the complement
Digital Circuit And Logic Design I. Lecture 8
Digital Circuit And Logic Design I Lecture 8 Outline Sequential Logic Design Principles (1) 1. Introduction 2. Latch and Flip-flops 3. Clocked Synchronous State-Machine Analysis Panupong Sornkhom, 2005/2
Digital Circuit And Logic Design I
Digital Circuit And Logic Design I Lecture 8 Outline Sequential Logic Design Principles (1) 1. Introduction 2. Latch and Flip-flops 3. Clocked Synchronous State-Machine Panupong Sornkhom, 2005/2 2 1 Sequential
Advanced Digital Logic Design EECS 303
Advanced Digital Logic Design EECS 303 http://ziyang.eecs.northwestern.edu/eecs303/ Teacher: Robert Dick Office: L477 Tech Email: dickrp@northwestern.edu Phone: 847 467 2298 Outline Introduction Reset/set
Review of Flip-Flop. Divya Aggarwal. Student, Department of Physics and Astro-Physics, University of Delhi, New Delhi. their state.
pp. 4-9 Krishi Sanskriti Publications http://www.krishisanskriti.org/jbaer.html Review of Flip-Flop Divya Aggarwal Student, Department of Physics and Astro-Physics, University of Delhi, New Delhi Abstract:
Chapter 4. Logic Design
Chapter 4 Logic Design 4.1 Introduction. In previous Chapter we studied gates and combinational circuits, which made by gates (AND, OR, NOT etc.). That can be represented by circuit diagram, truth table
Sequential Logic and Clocked Circuits
Sequential Logic and Clocked Circuits Clock or Timing Device Input Variables State or Memory Element Combinational Logic Elements From combinational logic, we move on to sequential logic. Sequential logic
CSE115: Digital Design Lecture 23: Latches & Flip-Flops
Faculty of Engineering CSE115: Digital Design Lecture 23: Latches & Flip-Flops Sections 7.1-7.2 Suggested Reading A Generic Digital Processor Building Blocks for Digital Architectures INPUT - OUTPUT Interconnect:
LAB #4 SEQUENTIAL LOGIC CIRCUIT
LAB #4 SEQUENTIAL LOGIC CIRCUIT OBJECTIVES 1. To learn how basic sequential logic circuit works 2. To test and investigate the operation of various latch and flip flop circuits INTRODUCTIONS Sequential