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Digital Electronics. Lecture 7 Sequential Logic Circuit Design. Announcements. http://www.uobkupartnership.talktalk.net Books, CD Exam and further teaching of electronics Digital Systems, Principles and Applications, 10th Edition R.J Tocci, N. S. Windmer , G. L. Moss, 2007. - PowerPoint PPT Presentation
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Digital Electronics
Lecture 7
Sequential Logic Circuit Design
Announcements
http://www.uobkupartnership.talktalk.netBooks, CDExam and further teaching of electronicsDigital Systems, Principles and Applications, 10th EditionR.J Tocci, N. S. Windmer, G. L. Moss, 2007.Kleitz, W., Digital Electronics, Pearson Education Inc, 2005.Clements, A, Microproscessor System Design, PWS-Kent publishing Copany, 1992.
Lecture 6 outlineReview of last LectureSequential Logic CircuitsBasic LatchFlip-Flops
Review of Last Lecture
Patternmaker 7.5 serial. Design procedure for combinational logic circuits.AddersMultiplexerSimulation exercises using logic converter
Sequential Logic Circuits
Any sequential logic system can be broken down into two sections: Memory part combinational part The combinational part will comprise the usual AND, OR gates etc.The memory part is usually implemented with bistable devices. Two basic types: latches and flip-flops.
Sequential Logic CircuitsAny sequential logic system can be broken down into two sections: Memory part combinational part The combinational part will comprise the usual AND, OR gates etc.The memory part is usually implemented with bistable devices. Two basic types: latches and flip-flops.
A latch changes state when the input states change. This property is known as transparency. Data is stored by the latch when an enable input (if provided) is valid. A flip-flop however can only change state on the application of a clock pulse.A purely sequential system is one in which the output is determined by the order in which the input signals are applied. Sequential circuits are classified as asynchronous (unclocked) or synchronous (clocked).
The Basic Latch
The basic latch has two stable states that correspond to a logic 1 and logic 0. The output changes from one state to another depending on the inputs.Consider the simple latch shown below.Truth table as shown below:
ABXY00110110100111XX
This is the basis of the SR (or RS) latch , where A=R, B=S, X=Q and Y=/Q. The circuit symbol is shown below.This is the basis of the SR (or RS) latch , where A=R, B=S, X=Q and Y=/Q. The circuit symbol is shown below.
The Gated SR Latch The Gated SR LatchThe inputs to a gated Latch are controlled by a gate/enable/clock input which allows the latch inputs A and B to be active only when a logic 1 is present on the clock input. This therefore is a level activated device.The truth table is now:
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The function of the RS gated latch can be illustrated with a waveform diagram as shown below.
RSClkQ/QXX0XXSame as A = B = 1001XXSame as A = B = 1011101010111111
The truth table is now:Symbol
The truth table is now:
The function of the RS gated latch can be illustrated with a waveform diagram as shown below.
RSClkQ/QXX0XXSame as A = B = 1001XXSame as A = B = 1011101010111111
The JK Flip-Flop
The JK flip-flop is basically an SR gated latch with modifications to eliminate the problems of the final indeterminate state. When the two inputs J and K are both 1 then the output Q changes state. It is said to toggle under these conditions.Circuit Symbol:
Truth table
Truth table:
Excitation tableTruth table:
The D-Type Flip-Flop
The D (data) type flip-flop is basically a single-bit storage device. It can be constructed by connecting an inverter between the J and K inputs of a JK flip-flop as shown overleaf.
DQn+10011
Data appearing on the data input D is simply clocked through to the output Q on the application of a clock pulse.Symbol:
The T-Type Flip-FlopThe T (toggle) type flip-flop also has a single input. It too can be implemented using a JK flip-flop; the inputs are simply connected together as shown below
PR ESET and Clear inputs
Positive and negative edged triggered devices
Main Points
Sequential Logic Circuits.LatchJ-K flip-flopD Type flip-flopT-type flip-flopCountersShift register
The End
Thank you for your attention.
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