digital logic with vhdl design

... Trang 1Introduction to Digital Logic with Laboratory ExercisesTrang 2Introduction to Digital Logic with Laboratory Exercises James Feher Copyright © 2010 James ... The inverter 11 2 Logic gates 13 History of logic chips 13 Logic symbols 14 Logical functions 15 3 Logic simplification 18 De Morgan's laws 18 Karnaugh maps 19 Circuit design, construction ... even refrigerators are all increasingly being designed with digital electronic controls You likely carry some sort of device designed with them with you nearly all your waking hours whether it

Ngày tải lên: 03/04/2021, 10:38

... Trang 1Introduction to Digital Logic with Laboratory ExercisesTrang 2Introduction to Digital Logic with Laboratory Exercises James Feher Copyright © 2010 James ... The inverter 11 2 Logic gates 13 History of logic chips 13 Logic symbols 14 Logical functions 15 3 Logic simplification 18 De Morgan's laws 18 Karnaugh maps 19 Circuit design, construction ... even refrigerators are all increasingly being designed with digital electronic controls You likely carry some sort of device designed with them with you nearly all your waking hours whether it

Ngày tải lên: 07/04/2021, 13:04

... 1.5 Structural Description with VHDL 25 1.6 VHDL Code for Simulation Test-Benches 32 1.7 Finite State Machines 40 1.8 Methodology for Digital Design with VHDL 47 1.9 Conclusions ... 11Chapter 1Introduction to Digital Design with VHDL The first chapter starts with an introduction to digital systems The levels ofabstraction commonly used for the description of a digital system are ... Thus, theprocess of designing digital logic starts with the behavioral description of thesystem to be designed Building blocks such as, registers, multiplexors, and logicblocks with their input

Ngày tải lên: 22/01/2018, 16:46

... Trang 1TP.HCM 2007 dce Digital Logic Design 1 FLIP-FLOP 2009 dce Introduction • So far we have seen Combinational Logic – The output(s) depends only on the current ... directly or by deriving state variables from them 2009 dce General Digital System dce2009 Synchronous and Asynchronous Sequential Logic • Synchronous – The timing of all state transitions is controlled ... triangleat the CLK input indicates that the input is activated with a PGT – A bubble and a triangleindicates that the CLK input is activated with a NGT – Control inputs have an effect on the output

Ngày tải lên: 30/01/2020, 21:11

... K-Map, design the BCD-to-seven-segment decoder using the minimum number of gates Trang 16Design a combinational circuit that converts a four bit Gray code to four bit binary number Trang 17Design ... binary input is 4, 5, 6 or 7, the binary output is three less than the input Trang 7Design a combinational circuit with three inputs x, y and z and three outputs A, B and C, when the binary input ... binary input is 4, 5, 6 or 7, the binary output is three less than the input Trang 8Design a combinational circuit with three inputs x, y and z and three outputs A, B and C, when the binary input

Ngày tải lên: 12/02/2020, 13:52

... Trang 1Lecture 11Combinational Design Procedure Trang 2w ° Design digital circuit from specification ° Digital inputs and outputs known • Need to determine logic that can transform data ° Start ... Trang 3Design Procedure (Mano) Design a circuit from a specification. 1 Determine number of required inputs and outputs. 2 Derive truth table 3 Obtain simplified Boolean functions 4 Draw logic ... minimal. ° Have seen five ways to represent a function: Trang 5Combinational logic design° Use multiple representations of logic functions ° Use graphical representation to assist in simplification

Ngày tải lên: 12/02/2020, 14:29

... serial adder using a sequential-logic procedure Trang 29 Design a serial adder using a sequential-logic procedure Trang 30 Design a serial adder using a sequential-logic procedure Trang 33Summary ... used with the next pair of bits in x and y The state table that specifies the sequential circuit is given in Table Trang 27 Design a serial adder using a sequential-logic procedure Trang 28 Design ... the same time ° Shift registers can be used with adders to build arithmetic units ° Remember: most digital hardware can be built from combinational logic (and, or, invert) and flip flops • Basic

Ngày tải lên: 12/02/2020, 15:09

... AB+AC+B = B+AC Boolean Algebra and Logic Simplification Trang 23Simplification Using Boolean Algebra.Gate Network for Example 1: ABAB Boolean Algebra and Logic Simplification Trang 24Simplification ... of terms is a minterm ° Each OR combination of terms is a maxterm Trang 16Representing Functions with Minterms ° Minterm number same as row position in truth table (starting from top from 0) ° ... 9ExpressionTrang 10Truth Table to Expression ° Converting a truth table to an expression • Each row with output of 1 becomes a product term • Sum product terms together. xyz + xyz’ + x’yz Any Boolean

Ngày tải lên: 12/02/2020, 15:12

... Converting between sum-of-products and NANDs ° Positive and negative logic • We use primarily positive logic in this course. Trang 3Logic functions of Nvariables ° Each truth table represents one ... 21Combinational Logic Using Universal Gates Trang 22Universality of NAND and NOR gatesTrang 24Exa mpl eTrang 27Alternate Logic-Gate RepresentationsStandard and alternate symbols for various logic gates ... INVERTER, the operation symbol is not changed) Trang 28Positive Logic and Negative LogicWe will be emphasizing primarily on positive logic in this course Trang 29Axioms and Graphical representation

Ngày tải lên: 12/02/2020, 15:41

... Trang 1Digital Logic DesignLecture 2 More Number Systems/Complements Trang 2w ° Hexadecimal numbers • Related ... binary numbers. ° Digital electronics requires frequent addition and subtraction of numbers You know how to design an adder, but what about a subtracter? ° A subtracter is not needed with the 2’s ... as Trang 393-Digit DecimalA bicycle odometer with only three digits is an example of a fixed-length decimal number system. The problem is that without a negative sign, you cannot tell a

Ngày tải lên: 12/02/2020, 15:41

... Algebra, Logic and Gates° Logical operators operate on binary values and binary variables. ° Basic logical operators are the logic functions AND, OR and NOT. ° Logic gates implement logic functions. ... the basic logic operations: 1 1 1 0 0 1 0 1 0 0 0 0 Z = X·Y Y Trang 15° Using Switches• Inputs: - logic 1 is switch closed - logic 0 is switch open • Outputs: - logic 1 is light on - logic 0 ... CMOS gate circuits, the foundation of current digital logic circuits Logic Function Implementation – cont’d BA D C A (B C + D) = A B C + A D Trang 17Digital Systems° Analysis problem: • Determine

Ngày tải lên: 12/02/2020, 15:51

... Transfer° Data can move from register to register. ° Digital logic used to process data ° We will learn to design this logic Register C Digital Logic Circuits Trang 31Transfer of Information ° Data ... Trang 1Digital Logic DesignLecture 3 Complements, Number Codes and Registers Trang 2w ° Complement of numbers ... [N] = 10011011 10011010 01100100 + 1 + 1 - 10011011 01100101 ° Algorithm 2 – Starting with the least significant bit, copy all of the bits up to and including the first 1 bit and then

Ngày tải lên: 12/02/2020, 18:08

... Provides insights on how to design hardware Trang 3Gate Delays° When the input to a logic gate is changed, the output will not change immediately. ° The switching elements within a gate take a finite ... circuit can have any number of AND gates each with any number of inputs. A B C D AB CD X=AB+CD SOP Trang 13Basic Combinational Logic CircuitsTrang 14° The logic gates accept signals from the inputs ... an unwanted pulse at the output of a combinational logic network – a momentary change in an output that should not have changed. ° A circuit with the potential for a glitch is said to have a

Ngày tải lên: 12/02/2020, 20:23

... operation (BUILT WITH NOR GATES) Characteristic table Excitation table Trang 22°1 °0 Review: Steering Gates ° The flow of logic can be controlled with a logic Trang 26An SR latch with a control ... outside logic signal inputs to the circuit Typically, the clock is not consider part of the signal inputs of the circuit. ° Outputs – The logic signal outputs. ° Present State – the logic value ... Flip-Flops etc ° A Sequential Circuit can be defined as circuit having sequential logic Sequential logic is a type of a logic circuit whose output depends not only on current inputs but also Trang

Ngày tải lên: 12/02/2020, 20:43

... can be constructed with three-state gates• Output state: 0, 1, and high-impedance (open ckts) • If the Enable input is low, the three-state gate has no output Trang 6Problem Design a 4-bit combinational ... Trang 1717 Draw the logic diagram of a two-to-four-line decoder using a NOR gates only including and enable input.Trang 18Problem (Mano) Using a decoder and external gates, design the combinational ... 22Problem Construct a 16 x1 multiplexer with two 8x1 and one 2 x 1 multiplexers (Use Block Diagrams) Trang 2323 Implement the following Boolean function with a 4 x 1 multiplexer and the external

Ngày tải lên: 12/02/2020, 22:25

... 43° Asynchronous design is often unavoidable: • User interfaces • Different speed devices • Clocks are difficult to distribute over long distances ° More difficult to design, design tools generally ... tools generally have been synchronous only, but asynchronous design tools are being developed. ° Most current devices us synchronous logic inside local blocks, and asynchronous communication ... rising edge. ° Different types of flip flops serve different functions ° Flip flops can be defined with characteristic functions. Trang 9° The most fundamental sequential components are the latch

Ngày tải lên: 12/02/2020, 23:39

... outputs: A>B, A=B, A<B ° Design Approaches • the truth table - 2 2n entries - too cumbersome for large n • use inherent regularity of the problem - reduce design efforts - reduce human ... C3 C2 Trang 21D01  D23 Therefore, one term in thelogic equation for A > B isA3 . B3’ Find A > B Trang 22Therefore, the next term in thelogic equation for A > B is C3 . C2 . A1 . B1’ ... multiplexer Trang 36Implementing a Four- Input Function with a MultiplexerTrang 38Thr ee- state gat es • A multiplexer can be constructed with three-state gates • Output state: 0, 1, and high-impedance

Ngày tải lên: 12/02/2020, 23:58

... feedback or storage elements). Trang 28Digital Design Overview° Design digital circuit from specification ° Digital inputs and outputs known • Need to determine logic that can transform data ° Start ... 51Multilevel Logic Circuits Objectives: 1 Design logic circuits that meet the fan-in requirements of the chosen technology. 2 Design a minimum-cost logic circuit. Trang 52Multilevel Logic CircuitsTwo ... 47° Design of a circuit starts with specification and ends up with a logic diagram. ° Analysis for a combinational circuit consists of determining the function that the circuit implements with:

Ngày tải lên: 13/02/2020, 00:14

... the combinational logic which realizes the input functions for the flip-flops and the output functions. The combinational logic may be implemented with gates, with a ROM, or with a PLA. Trang ... logic circuit. °Criteria table is used in analysis °Excitation tables is used in design Trang 26between current state and next state to determine flop input Trang 27flip-Design steps° Start with ... table with the above function using criteria table for the used flip-flop Trang 2424Trang 25Analysis Vs Design°Analysis: Start from circuit diagram, build state table or state diagram °Design:

Ngày tải lên: 13/02/2020, 00:30

... are evaluated as follows: A 0 check bit designates an even parity over the checked bits and a 1 designates an odd parity Since the bits were stored with even parity, the result, C = C 1 C 2 ... memory and compared with a new set of check bits generated from the read data. ° If the check bits compare, it signifies that no error has occurred If the check bits do not compare with the stored ... should be inactive Delay associated with write Trang 92 Activate read inputData input lines unused Write input signal should be inactive Delay associated with read Memory enable used to allow

Ngày tải lên: 13/02/2020, 00:35