The document discusses different types of flip-flops including RS NAND and NOR flip-flops, and covers the basics of sequential logic circuits. It defines level-triggered and edge-triggered clock inputs for flip-flops and compares asynchronous and synchronous clocked flip-flops. The timing diagrams show how positive and negative edge triggering determines when the output of a flip-flop changes state in response to clock pulses and input signals.
Task and Function is the basic component of a programming language. Even on hardware Verification , those task and function is used. Task ans function provides a short way to repeatedly use the same block of code many times, This presentation gives you the basic information about Task and Function in Verilog. For more information on this, kindly contact us.
The document describes the design and simulation of basic logic gates and a 2-to-4 decoder using Verilog HDL. It includes the block diagrams, truth tables, and Verilog code for AND, OR, NAND, NOR, XOR, XNOR and NOT gates. Testbenches are provided to simulate and verify the gate designs. The 2-to-4 decoder section provides the block diagram, theory of operation, and Verilog code using dataflow, behavioral and structural modeling styles. A testbench is also included to simulate the 2-to-4 decoder design.
Verilog HDL is introduced for modeling digital hardware at different levels of abstraction. Key concepts discussed include:
- Module instantiation, assignments, and procedural blocks for behavioral modeling.
- Concurrency is modeled using an event-based simulation approach with a time wheel concept.
- Switch level and gate level modeling using built-in primitives like transistors and logic gates.
- User-defined primitives (UDPs) allow custom logic to augment pre-defined primitives.
UVM is a standardized methodology for verifying complex IP and SOC in the semiconductor industry. UVM is an Accellera standard and developed with support from multiple vendors Aldec, Cadence, Mentor, and Synopsys. UVM 1.0 was released on 28 Feb 2011 which is widely accepted by verification Engineer across the world. UVM has evolved and undergone a series of minor releases, which introduced new features.
UVM provides the standard structure for creating test-bench and UVCs. The following features are provided by UVM
• Separation of tests from test bench
• Transaction-level communication (TLM)
• Sequences
• Factory and configuration
• Message reporting
• End-of-test mechanism
• Register layer
Hardware description languages (HDLs) allow designers to describe digital systems at different levels of abstraction in a textual format. The two most commonly used HDLs are Verilog and VHDL. Verilog is commonly used in the US, while VHDL is more popular in Europe. HDLs enable simulation of designs before fabrication to verify functionality. Digital designs can be modeled at the gate level, data flow level, or behavioral level in Verilog. Verilog code consists of a design module and test bench module to stimulate inputs and observe outputs.
How to create SystemVerilog verification environment?Sameh El-Ashry
Basic knowledge for the verification engineer to learn the art of creating SystemVerilog verification environment.
Starting from the specifications extraction till coverage closure.
The document discusses sequential circuits and different types of flip flops and counters. It describes how sequential circuits have memory and their output depends on current and past inputs. There are two main types of sequential circuits - asynchronous which can change state at any time and synchronous which use a clock signal to control when the output can change state. Common types of flip flops described include SR, JK, D and T flip flops. Counters can be asynchronous with the clock signal rippling through or synchronous where all flip flops share the same clock.
Task and Function is the basic component of a programming language. Even on hardware Verification , those task and function is used. Task ans function provides a short way to repeatedly use the same block of code many times, This presentation gives you the basic information about Task and Function in Verilog. For more information on this, kindly contact us.
The document describes the design and simulation of basic logic gates and a 2-to-4 decoder using Verilog HDL. It includes the block diagrams, truth tables, and Verilog code for AND, OR, NAND, NOR, XOR, XNOR and NOT gates. Testbenches are provided to simulate and verify the gate designs. The 2-to-4 decoder section provides the block diagram, theory of operation, and Verilog code using dataflow, behavioral and structural modeling styles. A testbench is also included to simulate the 2-to-4 decoder design.
Verilog HDL is introduced for modeling digital hardware at different levels of abstraction. Key concepts discussed include:
- Module instantiation, assignments, and procedural blocks for behavioral modeling.
- Concurrency is modeled using an event-based simulation approach with a time wheel concept.
- Switch level and gate level modeling using built-in primitives like transistors and logic gates.
- User-defined primitives (UDPs) allow custom logic to augment pre-defined primitives.
UVM is a standardized methodology for verifying complex IP and SOC in the semiconductor industry. UVM is an Accellera standard and developed with support from multiple vendors Aldec, Cadence, Mentor, and Synopsys. UVM 1.0 was released on 28 Feb 2011 which is widely accepted by verification Engineer across the world. UVM has evolved and undergone a series of minor releases, which introduced new features.
UVM provides the standard structure for creating test-bench and UVCs. The following features are provided by UVM
• Separation of tests from test bench
• Transaction-level communication (TLM)
• Sequences
• Factory and configuration
• Message reporting
• End-of-test mechanism
• Register layer
Hardware description languages (HDLs) allow designers to describe digital systems at different levels of abstraction in a textual format. The two most commonly used HDLs are Verilog and VHDL. Verilog is commonly used in the US, while VHDL is more popular in Europe. HDLs enable simulation of designs before fabrication to verify functionality. Digital designs can be modeled at the gate level, data flow level, or behavioral level in Verilog. Verilog code consists of a design module and test bench module to stimulate inputs and observe outputs.
How to create SystemVerilog verification environment?Sameh El-Ashry
Basic knowledge for the verification engineer to learn the art of creating SystemVerilog verification environment.
Starting from the specifications extraction till coverage closure.
The document discusses sequential circuits and different types of flip flops and counters. It describes how sequential circuits have memory and their output depends on current and past inputs. There are two main types of sequential circuits - asynchronous which can change state at any time and synchronous which use a clock signal to control when the output can change state. Common types of flip flops described include SR, JK, D and T flip flops. Counters can be asynchronous with the clock signal rippling through or synchronous where all flip flops share the same clock.
This document provides an introduction to Verilog, a hardware description language (HDL). It describes the main purposes of HDLs as allowing designers to describe circuits at both the algorithmic and gate levels, enabling simulation and synthesis. The document then discusses some Verilog basics, including modules as building blocks, ports, parameters, variables, instantiation, and structural vs procedural code. It provides examples of module declarations and typical module components.
This document discusses FIFO and LIFO structures. It provides an overview of what FIFO and LIFO are, pictorial representations of each, examples of Verilog code implementing them, and their applications. FIFO is described as a first-in, first-out queuing method that allows fast data transfer between designs without slowing processing speed. LIFO is defined as a last-in, first-out stacking method used to remember the current work and start new work. Sample Verilog code for a basic FIFO and LIFO is shown, and applications like inventory accounting are cited.
1) The document discusses sequential logic circuits and flip-flops. It defines sequential logic as circuits whose output depends on the previous inputs and states, requiring memory elements like flip-flops.
2) Flip-flops are described as basic memory storage elements that have two stable states and can be switched between them. Common types include SR, JK, D and T flip-flops.
3) SR and T flip-flops are discussed in detail. Their symbols, truth tables, and implementations using logic gates are presented. SR flip-flops can be built using NOR or NAND gates and can be set, reset, or held in state based on input conditions.
This document discusses pulse code modulation (PCM) and quantization noise. It explains that quantizing an analog signal introduces quantization error or noise. The quantization noise is modeled as a random variable with a uniform probability distribution between +/- step size/2. The step size depends on the number of quantization levels. A higher number of quantization levels reduces the step size and quantization noise, increasing the signal-to-noise ratio. The document also discusses different types of quantizers like uniform, midtread and midrise quantizers.
Flipflops JK T SR D All FlipFlop SlidesSid Rehmani
Flipflops JK T SR D All FlipFlop Slides. Uploaded by SidRehmani.
Jk flip flop presentation, T flip flop presentation, D flip flop presentation, D flip flop presentation.
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This document discusses flip-flops and sequential circuits. It begins with an introduction to sequential circuits and flip-flops. There are several types of flip-flops discussed including SR flip-flops, clocked SR flip-flops, JK flip-flops, and T flip-flops. SR flip-flops can be constructed using either NAND or NOR gates. The document provides details on the logic diagrams, truth tables, and operation of SR flip-flops. It also discusses using a clock signal to control synchronous sequential circuits and provides examples of waveforms and exercises for SR flip-flops.
This document discusses counters in digital electronics. It begins by introducing counters as sequential circuits that increment their output value by one each clock cycle, wrapping back to 0 after their maximum count. There are two main types of counters: asynchronous and synchronous. Asynchronous counters have their flip-flops clocked one after another by the previous flip-flop's output, causing a ripple effect. Synchronous counters clock all flip-flops simultaneously with a common clock signal. Examples of 4-bit asynchronous and synchronous counters are also provided with their respective timing diagrams.
Tasks and functions allow designers to abstract commonly used Verilog code into reusable routines. Tasks can contain timing constructs and pass multiple values through input, output, and inout arguments. Functions must not contain timing constructs and return a single value. Tasks are similar to subroutines while functions are similar to functions in other languages like FORTRAN. Automatic tasks make tasks re-entrant to avoid issues with concurrent calls operating on shared variables.
This document provides an overview of Verilog hardware description language (HDL) and gate-level modeling. It discusses the key components of Verilog modules like module definition, ports, parameters and instantiations. It describes how to define ports and connect ports in a module. It also covers different gate primitives in Verilog like AND, OR, NOT etc. and how to describe gate-level designs using these primitives by specifying gate connections and delays. Finally, it mentions some references for further reading on Verilog HDL and digital logic design.
Those slides describe digital design using Verilog HDL,
starting with Design methodologies for any digital circuit then difference between s/w (C/C++) and H/w (Verilog) and the most important constructs that let us start hardware design using Verilog HDL.
This document discusses the architecture of CPLDs and FPGAs. CPLDs consist of PAL-like blocks, I/O blocks, and a programmable interconnect structure. FPGAs consist of an array of configurable logic blocks, I/O blocks, and programmable row and column interconnect channels. The document compares CPLDs and FPGAs, noting that FPGAs have a more complex architecture and unpredictable delays while CPLDs are less complex, cheaper, and have more predictable delays. The conclusion restates that the document discussed the architecture of CPLDs and FPGAs and listed their comparisons.
Sequential circuits have outputs determined by both the current inputs and previous outputs due to the inclusion of memory elements. Combinational circuits only have outputs determined by the current inputs. Sequential circuits contain logic gates arranged in parallel and feedback loops allowing the circuit to store past states, while combinational circuits only depend on the current input combination. There are different types of sequential circuits including those controlled by a clock signal from a clock generator that produces periodic pulses defining the circuit timing.
This document discusses digital logic design and binary numbers. It covers topics such as digital vs analog signals, binary number systems, addition and subtraction in binary, and number base conversions between decimal, binary, octal, and hexadecimal. It also discusses complements, specifically 1's complement and radix complement. The purpose is to provide background information on fundamental concepts for digital logic design.
This document presents information about adders and binary coded decimal (BCD) adders. It defines half adders and full adders, which are computational devices that add binary digits and produce sum and carry outputs. It also explains what a BCD adder is and how it adds two 4-bit BCD digits while handling carries such that the result is always a valid BCD number between 0-9. The document provides examples of BCD addition and conversions between binary and BCD formats. It concludes with some applications of BCD adders in areas like digital displays and counters.
This document provides an overview of finite state machines (FSMs). It defines an FSM as a digital circuit whose output depends on both the current input and state. There are two main types of FSMs: Moore machines whose output depends only on the current state, and Mealy machines whose output depends on both the current state and input. The document discusses state diagrams, state tables, basic circuit organization including latches to represent states and combinational logic for next states and outputs. It also covers topics like state assignment methods including one-hot encoding commonly used to map FSMs onto field programmable gate arrays due to their register-rich architecture.
This document discusses hardware description languages used in electronics design. It describes how HDLs like VHDL and Verilog are used to program digital and mixed-signal circuits. Simulation allows validation of the design against specifications. The document also discusses formal verification using property specification languages and different modeling styles for Verilog like gate-level, dataflow, and behavioral modeling.
Scan design is currently the most popular structured DFT approach. It is implemented by Connecting selected storage elements present in the design into multiple shift registers, called Scan chains.
Scannability Rules -->
The tool perform basic two check
1) It ensures all the defined clocks including set/Reset are at their off-states, the sequential element remain stable and inactive. (S1)
2) It ensures for each defined clocks can capture data when all other defined clocks are off. (S2)
Shift registers are constructed using flip-flops connected in a way to store and transfer digital data. Data is stored at the Q output of D flip-flops during a clock pulse. Shift registers allow data to be transferred between flip-flops upon a clock edge. There are four types of data movement: serial in serial out, serial in parallel out, parallel in serial out, and parallel in parallel out. Shift registers can be loaded serially or in parallel and are used in applications like pseudo random pattern generators, ring counters, and Johnson counters.
The document describes conventions and signals used in the AMBA 3 APB protocol specification version 1.0. It summarizes write and read transfer procedures, including optional wait states using the PREADY signal. Error responses are also described. The operating states of the APB include IDLE, SETUP, and ACCESS states. PREADY controls exiting the ACCESS state.
The document discusses digital electronics flip-flops. It defines flip-flops as memory devices that can store one bit and have two outputs, Q and not-Q, that are always opposites. The document describes RS flip-flops and their truth tables. It explains the difference between asynchronous and synchronous (clocked) flip-flops. It also defines level-triggered and edge-triggered clocking and provides examples of positive and negative edge-triggered RS flip-flops with their truth tables and timing diagrams.
- A latch is a basic form of memory that has two stable states and can change its output state when its inputs change. The most basic type is the S-R (set-reset) latch, which can be constructed from NOR or NAND gates.
- Flip-flops are synchronous bistable devices that change state only at a specified point on the clock signal. Common types include the S-R, D, and J-K flip-flops.
- Latches and flip-flops can be used to store data, perform frequency division, and counting in digital circuits.
This document provides an introduction to Verilog, a hardware description language (HDL). It describes the main purposes of HDLs as allowing designers to describe circuits at both the algorithmic and gate levels, enabling simulation and synthesis. The document then discusses some Verilog basics, including modules as building blocks, ports, parameters, variables, instantiation, and structural vs procedural code. It provides examples of module declarations and typical module components.
This document discusses FIFO and LIFO structures. It provides an overview of what FIFO and LIFO are, pictorial representations of each, examples of Verilog code implementing them, and their applications. FIFO is described as a first-in, first-out queuing method that allows fast data transfer between designs without slowing processing speed. LIFO is defined as a last-in, first-out stacking method used to remember the current work and start new work. Sample Verilog code for a basic FIFO and LIFO is shown, and applications like inventory accounting are cited.
1) The document discusses sequential logic circuits and flip-flops. It defines sequential logic as circuits whose output depends on the previous inputs and states, requiring memory elements like flip-flops.
2) Flip-flops are described as basic memory storage elements that have two stable states and can be switched between them. Common types include SR, JK, D and T flip-flops.
3) SR and T flip-flops are discussed in detail. Their symbols, truth tables, and implementations using logic gates are presented. SR flip-flops can be built using NOR or NAND gates and can be set, reset, or held in state based on input conditions.
This document discusses pulse code modulation (PCM) and quantization noise. It explains that quantizing an analog signal introduces quantization error or noise. The quantization noise is modeled as a random variable with a uniform probability distribution between +/- step size/2. The step size depends on the number of quantization levels. A higher number of quantization levels reduces the step size and quantization noise, increasing the signal-to-noise ratio. The document also discusses different types of quantizers like uniform, midtread and midrise quantizers.
Flipflops JK T SR D All FlipFlop SlidesSid Rehmani
Flipflops JK T SR D All FlipFlop Slides. Uploaded by SidRehmani.
Jk flip flop presentation, T flip flop presentation, D flip flop presentation, D flip flop presentation.
Follow Me For More:
facebook.com/RjSidRehmani
This document discusses flip-flops and sequential circuits. It begins with an introduction to sequential circuits and flip-flops. There are several types of flip-flops discussed including SR flip-flops, clocked SR flip-flops, JK flip-flops, and T flip-flops. SR flip-flops can be constructed using either NAND or NOR gates. The document provides details on the logic diagrams, truth tables, and operation of SR flip-flops. It also discusses using a clock signal to control synchronous sequential circuits and provides examples of waveforms and exercises for SR flip-flops.
This document discusses counters in digital electronics. It begins by introducing counters as sequential circuits that increment their output value by one each clock cycle, wrapping back to 0 after their maximum count. There are two main types of counters: asynchronous and synchronous. Asynchronous counters have their flip-flops clocked one after another by the previous flip-flop's output, causing a ripple effect. Synchronous counters clock all flip-flops simultaneously with a common clock signal. Examples of 4-bit asynchronous and synchronous counters are also provided with their respective timing diagrams.
Tasks and functions allow designers to abstract commonly used Verilog code into reusable routines. Tasks can contain timing constructs and pass multiple values through input, output, and inout arguments. Functions must not contain timing constructs and return a single value. Tasks are similar to subroutines while functions are similar to functions in other languages like FORTRAN. Automatic tasks make tasks re-entrant to avoid issues with concurrent calls operating on shared variables.
This document provides an overview of Verilog hardware description language (HDL) and gate-level modeling. It discusses the key components of Verilog modules like module definition, ports, parameters and instantiations. It describes how to define ports and connect ports in a module. It also covers different gate primitives in Verilog like AND, OR, NOT etc. and how to describe gate-level designs using these primitives by specifying gate connections and delays. Finally, it mentions some references for further reading on Verilog HDL and digital logic design.
Those slides describe digital design using Verilog HDL,
starting with Design methodologies for any digital circuit then difference between s/w (C/C++) and H/w (Verilog) and the most important constructs that let us start hardware design using Verilog HDL.
This document discusses the architecture of CPLDs and FPGAs. CPLDs consist of PAL-like blocks, I/O blocks, and a programmable interconnect structure. FPGAs consist of an array of configurable logic blocks, I/O blocks, and programmable row and column interconnect channels. The document compares CPLDs and FPGAs, noting that FPGAs have a more complex architecture and unpredictable delays while CPLDs are less complex, cheaper, and have more predictable delays. The conclusion restates that the document discussed the architecture of CPLDs and FPGAs and listed their comparisons.
Sequential circuits have outputs determined by both the current inputs and previous outputs due to the inclusion of memory elements. Combinational circuits only have outputs determined by the current inputs. Sequential circuits contain logic gates arranged in parallel and feedback loops allowing the circuit to store past states, while combinational circuits only depend on the current input combination. There are different types of sequential circuits including those controlled by a clock signal from a clock generator that produces periodic pulses defining the circuit timing.
This document discusses digital logic design and binary numbers. It covers topics such as digital vs analog signals, binary number systems, addition and subtraction in binary, and number base conversions between decimal, binary, octal, and hexadecimal. It also discusses complements, specifically 1's complement and radix complement. The purpose is to provide background information on fundamental concepts for digital logic design.
This document presents information about adders and binary coded decimal (BCD) adders. It defines half adders and full adders, which are computational devices that add binary digits and produce sum and carry outputs. It also explains what a BCD adder is and how it adds two 4-bit BCD digits while handling carries such that the result is always a valid BCD number between 0-9. The document provides examples of BCD addition and conversions between binary and BCD formats. It concludes with some applications of BCD adders in areas like digital displays and counters.
This document provides an overview of finite state machines (FSMs). It defines an FSM as a digital circuit whose output depends on both the current input and state. There are two main types of FSMs: Moore machines whose output depends only on the current state, and Mealy machines whose output depends on both the current state and input. The document discusses state diagrams, state tables, basic circuit organization including latches to represent states and combinational logic for next states and outputs. It also covers topics like state assignment methods including one-hot encoding commonly used to map FSMs onto field programmable gate arrays due to their register-rich architecture.
This document discusses hardware description languages used in electronics design. It describes how HDLs like VHDL and Verilog are used to program digital and mixed-signal circuits. Simulation allows validation of the design against specifications. The document also discusses formal verification using property specification languages and different modeling styles for Verilog like gate-level, dataflow, and behavioral modeling.
Scan design is currently the most popular structured DFT approach. It is implemented by Connecting selected storage elements present in the design into multiple shift registers, called Scan chains.
Scannability Rules -->
The tool perform basic two check
1) It ensures all the defined clocks including set/Reset are at their off-states, the sequential element remain stable and inactive. (S1)
2) It ensures for each defined clocks can capture data when all other defined clocks are off. (S2)
Shift registers are constructed using flip-flops connected in a way to store and transfer digital data. Data is stored at the Q output of D flip-flops during a clock pulse. Shift registers allow data to be transferred between flip-flops upon a clock edge. There are four types of data movement: serial in serial out, serial in parallel out, parallel in serial out, and parallel in parallel out. Shift registers can be loaded serially or in parallel and are used in applications like pseudo random pattern generators, ring counters, and Johnson counters.
The document describes conventions and signals used in the AMBA 3 APB protocol specification version 1.0. It summarizes write and read transfer procedures, including optional wait states using the PREADY signal. Error responses are also described. The operating states of the APB include IDLE, SETUP, and ACCESS states. PREADY controls exiting the ACCESS state.
The document discusses digital electronics flip-flops. It defines flip-flops as memory devices that can store one bit and have two outputs, Q and not-Q, that are always opposites. The document describes RS flip-flops and their truth tables. It explains the difference between asynchronous and synchronous (clocked) flip-flops. It also defines level-triggered and edge-triggered clocking and provides examples of positive and negative edge-triggered RS flip-flops with their truth tables and timing diagrams.
- A latch is a basic form of memory that has two stable states and can change its output state when its inputs change. The most basic type is the S-R (set-reset) latch, which can be constructed from NOR or NAND gates.
- Flip-flops are synchronous bistable devices that change state only at a specified point on the clock signal. Common types include the S-R, D, and J-K flip-flops.
- Latches and flip-flops can be used to store data, perform frequency division, and counting in digital circuits.
This document discusses sequential logic circuits and flip-flops. It begins by defining sequential logic and differentiating it from combinational logic. It then describes flip-flops as the basic building blocks of sequential logic that provide memory. It identifies four common types of flip-flops - SR, JK, D and T - and describes their operation, truth tables and implementation using logic gates. The document provides details on each type of flip-flop to help understand their functionality and applications in sequential logic circuits.
Flip-flops are basic memory circuits that have two stable states and can store one bit of information. There are several types of flip-flops including SR, JK, D, and T. The SR flip-flop has two inputs called set and reset that determine its output state, while the JK flip-flop's J and K inputs can toggle its output. Flip-flops like the D and JK can be constructed from more basic flip-flops. For sequential circuits, flip-flops are made synchronous using a clock input so their state only changes at the clock edge.
Flipflops and Excitation tables of flipflopsstudent
This document discusses latches and flip-flops. It explains that gates perform logic operations while flip-flops can store binary values. There are two types of sequential logic circuits: combinational using gates and sequential using flip-flops like the SR, D, JK, and T flip-flops. Flip-flops change state based on clock pulses in synchronous circuits or independent of clocks in asynchronous circuits.
This document discusses different types of flip-flops including SR, JK, D, and T flip-flops. It explains that flip-flops have two stable states (high and low) and can switch between these states under a control signal like a clock. The document provides truth tables and diagrams to illustrate the working of each flip-flop type and their applications in storing data and transferring data between registers.
The document discusses sequential logic circuits called latches and flip-flops that can store information. It describes the basic components and functions of SR latches, gated D latches, and various types of edge-triggered flip-flops including SR, D, JK, and T flip-flops. The key differences between latches and flip-flops are that latches change state continuously based on their inputs while flip-flops only change at specific clock edges.
Gates perform logic operations while flip-flops store bits. There are two types of logic circuits: combinational which have no memory and sequential which use feedback. Basic sequential building blocks are flip-flops. Synchronous circuits use a common clock while asynchronous circuits do not. Clocks synchronize circuits by alternating high and low periodically. Flip-flops can be triggered by the clock's high or low level or its rising or falling edge. Common flip-flop types are RS, D, JK, and T.
Latches and flip-flops are basic forms of digital memory. Latches have two stable states and can be constructed from NOR or NAND gates. The most basic type is the S-R latch, which can be set or reset by applying a momentary input signal. Flip-flops differ in that they are clocked devices which change state only on a clock edge. Common types include the D flip-flop and J-K flip-flop.
The document discusses sequential circuits and their basic components. It describes how SR latches can store a bit using feedback and how their behavior can be represented using truth tables and state diagrams. SR latches are glitch sensitive. D latches and D flip-flops are also discussed, with latches being level sensitive and flip-flops edge triggered. Other types of flip-flops include T and J-K flip-flops. A master-slave J-K flip-flop is shown to realize a clocked J-K flip-flop using two SR latches.
The document discusses different types of sequential logic circuits used for memory elements, including latches and flip-flops. It describes pulse-triggered latches like the S-R and D latches, and edge-triggered flip-flops such as the S-R, D, J-K, and T flip-flops. It provides their characteristic tables and discusses how their output states change based on input signals and the clock pulse.
JK & MASTER SLAVE FLIP-FLOP
The document discusses the JK flip-flop, which removes invalid states that occur in other flip-flops. The JK flip-flop has inputs for J, K, preset, clear, and clock, and outputs of Q and Q'. It operates in four modes - hold, set, reset, toggle - based on the states of J and K. A master-slave JK flip-flop uses two JK flip-flops connected by an inverter to avoid race-around conditions, with the master capturing the input on the rising clock edge and the slave outputting it on the falling edge.
This document provides an overview of sequential circuits such as latches and flip-flops. It defines sequential circuits and explains that they produce outputs based on current and previous inputs. The basic types of latches and flip-flops are described as SR, D, JK, and T. Characteristics of synchronous and asynchronous sequential circuits are also summarized. Common applications of sequential circuits include shift registers, counters, clocks, and storing temporary information in microprocessors. The document concludes by discussing specific sequential circuit components like SR latches, D flip-flops, and JK flip-flops in more detail.
SEQUENTIAL CIRCUITS [FLIP FLOPS AND LATCHES]SUBHA SHREE
This presentation is about the sequential logic circuits, mainly concentrating on flip-flops and latches. A unique feature in this presentation is the incorporation of circuit images generated from Multisim software imparting practical knowledge to the users. This consists of both the active low and high versions of different circuits.
This document discusses sequential logic circuits and memory elements such as latches and flip-flops. It describes different types of latches including the S-R latch, gated S-R latch, and gated D latch. It also covers various types of flip-flops including the S-R, D, J-K, and T flip-flops. It explains the differences between latches and flip-flops and their applications in synchronous and asynchronous logic circuits.
SEQUENTIAL LOGIC CIRCUITS (FLIP FLOPS AND LATCHES)Sairam Adithya
this presentation is about the sequential logic circuits, mainly concentrating on flip-flops and latches. a unique feature in this presentation is the incorporation of circuit images generated from Multisim software imparting practical knowledge to the users. this consists of both the active low and high versions of different circuits.
Flip Flop | Counters & Registers | Computer Fundamental and OrganizationSmit Luvani
Agenda :
Sequential Circuit
R-S/S-R Flip Flop
Active low state
Active High State
Clocked State
J-K Flip Flop
Master Slave Flip Flop
T Flip Flop
D-Flip Flop
Counters :
What is Counter?
Ripple Counter
Synchronous Counter
Binary Ripple Counter
Register
Shift Register
Shift Registers – Serial In Serial Out
Shift Registers – Serial In Parallel Out
Shift Registers – Parallel In Serial Out
Shift Registers – Parallel In Parallel Out
This document discusses sequential logic circuits and various types of flip flops. It defines sequential logic circuits as circuits whose outputs depend not only on present inputs but also past inputs. Several types of flip flops are described including SR, Clocked SR, JK, T, and D flip flops. The document provides details on the logic symbol, truth table, and logic circuit for SR and JK flip flops. It also discusses clock signals and provides examples of determining the output for various flip flop types given input waveforms.
JK flip-flops have two outputs, Q and Q', and four modes of operation: hold, set, reset, toggle. The primary output is Q. There are two stable states that can store state information. JK flip-flops are used for data storage in registers, counting in counters, and frequency division. They can divide the frequency of a periodic waveform in half by toggling on each input clock pulse.
This document discusses different types of flip-flops including edge-triggered flip-flops like the S-R, D, and J-K flip-flops. It describes their characteristics such as how their output changes depending on the input and clock signal. The S-R flip-flop can be set or reset. The D flip-flop copies its input to the output on the clock edge. The J-K flip-flop can toggle its output. The T flip-flop is a single-input version of the J-K flip-flop that toggles its output. Flip-flops have applications in data transfer and frequency division.
2. Objetivos:
• Determinar la salida de un F-F RS NAND y un F-F
NOR dado un m, state the output of an RS NAND and
RS NOR.
• Given a clock signal, determine the PGT and NGT.
• Define “Edge Triggered” and “Level Triggered”.
• Draw a Clocked F/F with and “Edge Triggered”
clock input and a “Level Triggered” clock input.
3. LOGIC CIRCUITS
Logic circuits are classified into two groups:
Combinational logic circuits Logic gates make decisions
Basic building
blocks include:
Sequential logic circuits Flip Flops have memory
Basic building blocks
include FLIP-FLOPS:
4. FLIP-FLOPS
•Memory device capable of storing one
bit
S Q •Memory means circuit remains in one
state after condition that caused the
state is removed.
R Q •Two outputs designated Q and Q-Not
that are always opposite or
complimentary.
•When referring to the state of a flip flop,
referring to the state of the Q output.
5. FLIP-FLOPS
Symbol
SET •To SET a flip flop means to
S Q make Q =1
RESET
R Q
Truth Table
•To RESET a flip flop means to
make Q = 0
6. FLIP-FLOPS
5V
+V
1k 1k
OUTPUT 1k 1k OUTPUT
Q NOT Q
1k 1k
NPN NPN
1k 1k
set reset
input input
•The flip flop is a bi-stable multivibrator; it has two stable states.
•The RS flip flop can be implemented with transistors.
7. R-S FLIP-FLOP
Symbols: Set Normal
S Q
FF
R Q
Reset Comple-
mentary
Truth Table:
Mode of Operation Inputs
Outputs
S R Q
Q’
Prohibited 0 0 1
1
Set 0 1 1 0
Reset 1 0 0 1
Hold 1 1 Q
Q’
8. R-S FLIP-FLOP
Active-Low
NAND LATCH
Q
SET
7400
Q NOT
RESET
7400
DEMORGANIZED NAND LATCH
NAND LATCH Q
SET
Q NOT
RESET
SET RES Q NOT-Q MODE
0 0 1 1 PROHIBITED
0 1 1 0 SET
1 0 0 1 RESET
1 1 NO CHG HOLD
12. TEST
Memory
1. Logic gates make decisions, flip flops have ____________________?
2. One flip flop can store how many bits? 1
3. What are the two outputs of a flip flop? Q Q-NOT
4. When referring to the state of a flip flop, we’re referring to the state
of which output? Q
5. What does it mean to SET a flip flop? Q = 1
6. What does it mean to RESET a flip flop? Q = 0
13. TEST
What is the mode of operation of the R-S flip-flop (set, reset or hold)?
What is the output at Q from the R-S flip-flop (active LOW inputs)?
L
? High
H
Mode of operation = ?
Set
H
? High
H
Mode of operation = ?
Hold
H
? Low
L
Mode of operation = ?
Reset
14. CLOCKED R-S FLIP-FLOP
Set FF Set FF
S Q S Q
Clock
CLK
Reset Q Reset Q
R R
ASYNCHRONOU SYNCHRONOUS
S
Outputs of logic circuit can Clock signal determines
change state anytime one exact time at which any
or more input changes output can change state
15. Clock
Digital signal in the form of a rectangular
or square wave
Astable
multivibrator
A clocked flip flop changes state only when
permitted by the clock signal
16. TRIGGERING OF FLIP-FLOPS
• Level-triggering is the transfer of data from input to
output of a flip-flop anytime the clock pulse is proper
voltage level.
• Edge-triggering is the transfer of data from input to
output of a flip-flop on the rising edge (L-to-H) or falling
edge (H-to-L) of the clock pulse. Edge triggering may be
either positive-edge (L-to-H) or negative-edge (H-to-L).
NGT-Negative Going Transition
PGT-Positive Going Transition
Negative-edge triggering
Positive-edge triggering
H
L
time
Level triggering
17. CLOCKED R-S FLIP-FLOP
Symbols: Set FF Normal
S Q
Clock
CLK
Reset Q
R Comple-
mentary
Truth Table:
Mode of operation Inputs
Outputs
Clk S R Q
Q’
Hold + pulse 0 0 no
change
Reset + pulse 0 1
0 1
Set + pulse 1 0 1 0
18. TEST
What is the mode of operation of the clocked R-S flip-flop (set, reset, hold)?
What is the output at Q from the clocked R-S flip-flop (active HIGH inputs)?
H
?
High
^
L Mode of operation = ? Set
L
?
High
^
Mode of operation = Hold
?
L
L
?Low
^
H
Mode of operation = ?
Reset
20. POSITIVE EDGE TRIGGERED
Symbols: R-S FLIP-FLOP
EDGE TRIGGERED R-S FLIP FLOP
SET Q
CLOCK
Q NOT
RESET
CLK SET RES Q NOT-Q MODE
PGT 0 0 NO CHG HOLD
PGT 0 1 0 1 RESET
Truth Table: PGT 1
PGT 1
0 1 0 SET
1 1 1 INVALID
CLK R S Q
0 X X NO CHG
1 X X NO CHG
X X NO CHG
0 0 NO CHG
0 1 SET
1 0 RESET
1 1 ILLEGAL
21. POSITIVE EDGE TRIGGERED
R-S FLIP-FLOP
TIMING DIAGRAMS
C
R
CLK R S Q
0
0
0
1
NO CHG
SET
S
1 0 RESET
1 1 ILLEGAL Q
22. NEGATIVE EDGE TRIGGERED
Symbols: R-S FLIP-FLOP
EDGE TRIGGERED R-S FLIP FLOP
SET Q
CLOCK
EDGE
DETECTOR
Q NOT
RESET
CLK SET RES Q NOT-Q MODE
PGT 0 0 NO CHG HOLD
PGT 0 1 0 1 RESET
Truth Table: PGT 1
PGT 1
0 1 0 SET
1 1 1 INVALID
CLK R S Q
0 X X NO CHG
1 X X NO CHG
X X NO CHG
0 0 NO CHG
0 1 SET
1 0 RESET
1 1 ILLEGAL
23. NEGATIVE EDGE TRIGGERED
R-S FLIP-FLOP
TIMING DIAGRAMS
C
R
CLK R S Q
0
0
0
1
NO CHG
SET
S
1 0 RESET
1 1 ILLEGAL Q
24. TEST
1. Type of flip flop where the outputs of circuit can change state anytime
one or more input changes? ASYNCHRONOUS
2. Type of flip flop where the clock signal controls when any output can
change state? SYNCHRONOUS
3. What do we call a digital signal in the form of a repetitive pulse or square wave?
CLOCK
4. Which is easier to design and troubleshoot, clocked or not clocked flip flops?
Clocked flip flops are easier to troubleshoot because we
can stop the clock and examine one set of input and
output conditions.