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Topic: Sequential logic

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	Sequential logic - Definition, explanation (Site not responding. Last check: 2007-10-08)
		In digital circuit theory, sequential logic is a type of logic circuit whose output depends not only on the present input but also on the history of the input.
		Sequential logic is therefore used to construct some types of computer memory, other types of delay and storage elements, and finite state machines.
		Asynchronous sequential logic is the most general kind of sequential logic, but because of its flexibility it is also the most difficult kind to design.
	www.calsky.com /lexikon/en/txt/s/se/sequential_logic.php (521 words)

	What is sequential logic? - a definition from Whatis.com - see also: flip-flop
		Sequential logic is a form of binary circuit design that employs one or more inputs and one or more outputs, whose states are related by defined rules that depend, in part, on previous states.
		A common example of a circuit employing sequential logic is the flip-flop, also called a bistable gate.
		Sequential logic differs from combinatorial logic (also called combinational logic).
	whatis.techtarget.com /definition/0,,sid9_gci826120,00.html (289 words)

	Combinational logic Summary
		Sequential control refers to the execution of statements in the order in which they were written by the programmer.
		This is in contrast to sequential logic, in which the output depends not only on the present input but also on the history of the input.
		For example, the part of an arithmetic logic unit, or ALU, that does mathematical calculations is constructed in accord with combinational logic, although the ALU is controlled by a sequencer that is constructed in accord with sequential logic.
	www.bookrags.com /Combinational_logic (625 words)

	Programmable sequential logic (Site not responding. Last check: 2007-10-08)
		The arithmetic and logic unit, of known type, operates on two source operands, which may be register contents, logic inputs, or memory words, and transfers results to a destination, such as a register, group of outputs, or memory location.
		The example chosen is that of the sequential logic built up from TTL circuits, equipped with a direct access, modular memory, and designed to carry out all the logic functions required for the interconnection of a controlling minicomputer with a passive switching network of an automatic exchange.
		Sequential execution of an instruction has a number of phases, t0-t7, of which some may be skipped, for example according to the number of memory words to be read, and, evidently, according to test results.
	www.sacnewsmonthly.com /invent/process_preparation_1_5-dimethylbicyclo_3_2_1_octan-8-ol/programmable_sequential_logic.html (2072 words)

	Sequential Logic
		Sequential logic differs from combinational logic in that the output of the logic device is dependent not only on the present inputs to the device, but also on past inputs; i.e.
		A logic diagram for this device is shown in Figure 2.3, together with its circuit symbol.
		A state table for the RS flip flop is shown in Figure 2.3, together with its a logic diagram and its circuit symbol.
	www.cs.mun.ca /~paul/cs3724/material/web/notes/node12.html (1055 words)

	Sequential Circuits Part-I
		Combinational logic output depends on the inputs levels, whereas sequential logic output depends on stored levels and also the input levels.
		A sequential circuit is specified by a time sequence of inputs, outputs, and internal states.
		Sequential circuits have a clock signal as one of their inputs.
	www.asic-world.com /digital/seq1.html (380 words)

	Introduction to Sequential Circuits
		Sequential circuits use current input variables and previous input variables by storeing the information and putting back into the circuit on the next clock (activation) cycle.
		There are two types of input to the combinational logic; External inputs which come from outside the circuit design and are not controlled by the circuit; Internal inputs which are a function of a previous output states.
		An important thing to note with sequential circuits is that duration of the activating pulse should be low enough so that the secondary inputs do not change state in same activating pulse.
	www.ee.surrey.ac.uk /Projects/Labview/Sequential/Course/03-Seq_Intro/Intro.html (402 words)

	The Basic RS NAND Latch (Site not responding. Last check: 2007-10-08)
		In order for a logical circuit to "remember" and retain its logical state even after the controlling input signal(s) have been removed, it is necessary for the circuit to include some form of feedback.
		The same logic 1 will also be applied to the second input of the other NAND gate, allowing that output to fall to a logic 0 level.
		Now, the unconnected input is held at a logic 1 through its resistor (an electronic component that allows an electrical connection without causing a dead short), while the connected input is held at logic 0 by the direct connection through the switch.
	www.play-hookey.com /digital/rs_nand_latch.html (909 words)

	Hardware Digital Design (Site not responding. Last check: 2007-10-08)
		Sequential VHDL statements allow you to describe the operation, or behavior, of your circuit as a sequence of related events.
		The use of sequential statements to describe combinational logic implies that our use of the term sequential in VHDL is somewhat different from the term as it is often used to describe digital logic.
		As we will see, it is possible (and quite common) to write sequential VHDL statements, using processes and subprograms, to describe what is essentially combinational logic.
	www.ntu.edu.sg /home/ehdjwong/vhdl/sequential/seq.htm (171 words)

	Definition of Sequential logic
		In other words, sequential logic has storage (memory) while combinatorial logic does not.
		The speed of the clock is governed by the slowest logic path in the circuit.
		The only way around this limitation is to split complex operations into several simpler operations, a technique called 'pipelining', but this makes the design much more difficult to understand.
	www.wordiq.com /definition/Sequential_logic (547 words)

	Programmable Logic DesignLine \| Sequential equivalence checking for RTL models
		The advantages of verifying such sequential modifications using formal methods at the block level are identified.
		Examples of sequential differences span the space from retimed pipelines (thus breaking the maps between registers, and rendering combinational equivalence checkers ineffective), differing latencies and throughputs (allowing for checking re-pipelined designs), and even scheduling and resource allocation differences.
		These sequential modifications to a design are ways to robustly meet timing, area and power goals in a reliable manner.
	www.pldesignline.com /189500363 (912 words)

	Sequential Statements (Site not responding. Last check: 2007-10-08)
		Such descriptions are natural for order-dependent circuits such as state machines and for complex combinational logic that involves some priority of operations.
		As we will see, it is possible (and quite common) to write sequential VHDL statements, using processes and subprograms, to describe what is essentially combinational logic.
		Sequential statements are found within processes, functions, and procedures.
	www.acc-eda.com /vhdlref/refguide/language_overview/sequential_statements/sequential_statements.htm (227 words)

	ABC: A Simple System for Sequential Synthesis and Verification (Site not responding. Last check: 2007-10-08)
		Sequential logic is represented in ABC on a technology-independent level.
		Sequential synthesis transforms the current network by modifying its logic together with the memory elements (latches or flip-flops) if they are present.
		This command attempts to attach the gates from the current library to the logic nodes in such a way that the functionality of the nodes is preserved.
	www.eecs.berkeley.edu /~alanmi/abc (6905 words)

	Programmable Logic DesignLine \| Sequential logic equivalence checker claims huge speed increase
		Sequential logic equivalence checker claims huge speed boost
		According to Calypto (Santa Clara, Calif.), the foundation of sequential analysis is the ability to deal with large, complex changes in design state and abstraction.
		Sequential changes are common when comparing functional system-level designs with cycle accurate RTL designs, Calypto said, adding that SLEC 2.0 can handle designs in which the state and temporal differences are measured in the millions.
	www.pldesignline.com /188101096 (649 words)

	Flip Flops and Sequential Logic
		Sequential circuits are more powerful than combinational circuits because they can store information between operations performed by combinational circuits.
		We will focus on synchronous sequential circuits, which are circuits that can be defined from the knowledge of their signals at discrete instants of time.
		These discrete instants are determined by a clock pulse generator attatched to the circuit.
	www.otal.umd.edu /drweb/cmsc311/ff.html (361 words)

	BigPatents -- Sequential logic circuit
		A circuit has a logic memory, a preceding logic circuit, a succeeding logic circuit, and a function defining circuit.
		An input signal is taken by the preceding logic circuit, where a new logic state is produced based on the input signal and a present logic state in the logic memory executing a defined calculation.
		The succeeding logic circuit produces an output signal based on the logic state of the logic memory executing a defined calculation.
	www.bigpatents.com /pnum/4706217 (136 words)

	Sequential Logic Basics
		Understanding sequential logic design is essential to the design of a processor (hint).
		We shall look at two ways to represent the functionality of simple sequential circuits and then look a small case study to demonstrate some of the nuances (pronounced ``pitfalls'') of sequential logic.
		This is another representation of sequential logic circuits.
	www.seas.upenn.edu /~cse370/cse372/manual/node5.html (810 words)

	Synthesizers.com --- Q962 Sequential Switch
		The Q962 Sequential Switch provides the functionality of a Moog 962 which includes converting the Q960 Sequential Controller to a full 24 stages by alternately selecting one of three rows.
		The primary function of the Q962 is to select the rows of a Q960 sequential controller to emulate a 24-stage sequencer.
		This is accomplished by patching a trigger output from the Q960 to the shift input on the Q962.
	www.synthesizers.com /q962.html (482 words)

	[No title]
		Students will be able to design combinational and sequential logic circuits from specifications on paper and in a laboratory setting.
		Each laboratory station is equipped with a digital logic breadboard unit containing a power supply, timers, switches and indicators, a Tektronix logic analyzer, and a dot-matrix printer.
		Laboratory assignments progress from investigation of the properties of basic logic gates and flip flops to the design of arithmetic and sequential logic circuits using medium-scale integrated circuit devices.
	www.cse.nd.edu /academics/print_version.php?course_number=221&department=CSE (323 words)

	Difference between Combinational and Sequential Logic
		Unlike combinational logic, sequential circuits have state, which means basically, sequential circuits have memory.
		The main difference between sequential circuits and combinational circuits is that sequential circuits compute their output based on input and state, and that the state is updated based on a clock.
		Combinational logic circuits implement Boolean functions, so they are functions only of their inputs, and are not based on clocks.
	www.cs.umd.edu /class/spring2003/cmsc311/Notes/Seq/diff.html (809 words)

	Sequential Circuits Part-II
		A sequential circuit as seen in the last page, is combinational logic with some feedback to maintain its current value, like a memory cell.
		To understand the basics let's consider the basic feedback logic circuit below, which is a simple NOT gate whose output is connected to its input.
		Now that we know the sequential circuits basics, let's look at each of them in detail in accordance to what is taught in colleges.
	www.asic-world.com /digital/seq2.html (521 words)

	Sequential Update Logic
		This slide show deals primarily with the logic of a sequential update.
		Sequential updating is useful when there is a large percentage of hits between the two files.
		In sequential processing you are going to be stepping through both files one record at a time and processing them together.
	www.bristol.mass.edu /pgrocer/cis51/Presentations/sequpdate.html (1013 words)

	Charge Pump PLL (Communications Blockset)
		A sequential logic phase detector, also called a digital phase detector or a phase/frequency detector.
		A sequential logic phase detector operates on the zero crossings of the signal waveform.
		Hence, the sequential logic phase detector acts as a frequency detector.
	www.technion.ac.il /guides/matlab/toolbox/commblks/ref/chargepumppll.html (329 words)

	Logic Design Tool - A graphical aid for developing combinatorial and sequential logic (Site not responding. Last check: 2007-10-08)
		LDT is a graphical aid for developing combinatorial and sequential logic.
		LDT is based upon a hierarchy of Karnaugh maps that relate input variables to next state and output variables.
		Known don’t care areas of the logic space are collapsed in order to manage its size.
	www.logicdesigntool.com (244 words)

	Sequential Logic Elements
		The essential difference between Combinational Logic (the kind we have seen up to now) and Sequential Logic is simple.
		The output from some sequential logic depends, not only on the inputs to the logic at that instant, but also on the past output states of the piece of logic.
		But with sequential logic, if S is the set of States of the logic, it is described by the mapping {0,1}^m × S(t) (i.e.
	www.rz.uni-hohenheim.de /hardware/basics/csc102/ch10.html (766 words)

	Sequential Logic Optimization for Low Power Using Input-Disabling Precomputation Architectures - MONTEIRO, DEVADAS, ...
		Abstract: Precomputation is a recently proposed logic optimization technique which selectively disables the inputs of a logic circuit, thereby reducing switching activity and power dissipation, without changing logic functionality.
		In sequential precomputation, output values required in a particular clock cycle are selectively precomputed one clock cycle earlier, and the original logic circuit is "turned off" in the succeeding clock cycle.
		MONTEIRO, J., DEVADAS, S., and GHOSH, A.: 'Sequential logic optimization for low power using input disabling precomputation architectures,' IEEE Transactions on CAD, 1998, 17(3), pp.
	citeseer.ist.psu.edu /monteiro98sequential.html (537 words)

	More Sequential Logic
		We must examine the logic which leads to the input of the f-f, and write down equations that represent the logic.
		Now that we have been introduced to the techniques of analysis, it is time to reverse gears and use these same tools to design a sequential logic circuit that implements an FSM.
		The trickiest part of designing sequential circuits is the encoding of the state variables.
	www.seas.upenn.edu /~cse370/cse372/manual/node6.html (1384 words)

	QUIZ.HTML
		In general, the NEXT STATE of a sequential logic circuit is determined by the
		If a sequential circuit possesses N memory elements (binary cells or flip flops), what is the maximum number of states could it have?
		A latch is a synchronous sequential logic circuit.
	unix.cc.wmich.edu /~johnson/ece250/Quiz7/quiz.html (308 words)

	EE 280 - DESIGN OF LOGIC CIRCUITS
		The course is designed to give the student the ability to complete practical design problems in combinational and sequential logic.
		EE280: Design of Logic Circuits requires several individual design and design validation projects to reinforce the theoretical foundations and concepts of digital systems and digital system design processes.
		Students typically design three to six combinational and sequential logic systems, describe their designs using a Hardware Description Language (HDL), such as Verilog or VHDL, and then validate their designs and HDL descriptions via HDL post-synthesis and post-implementation simulation using modern CAD tool sets.
	www.engr.uky.edu /~donohue/abet/EE280.htm (343 words)

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