PPT-Combinational and Sequential Circuits

Up to now we have discussed combinational circuits In many cases one can reduce the complexity of the hardware by using sequential circuits Sequential circuits allow for more flexible and more sophisticated circuit realizations with richer . The behavior of a combinational circuit is memorylessthatisgivenastimulustotheinputofacom binational circuit a response appears at the output after some propagation delay but the response is not stored or fedbackSimplyputtheoutputdependssolelyonitsm 1 Motivation We know that digital circuits are formed by two type of components 1 Combinational circuit and 2 Sequential Circuits Combinational circuit component s are used only for logic implementation and cant store the bits ie work as memory But Both the outputs and the next state are a f unction of the inputs and the present state Recall f om previous les on that s entia l ci rcuit design involves the flow as shown brPage 2br Analysis consists of obtaining a statetable or a statediagram fr 1111 Origins of StuckOrigins of StuckOrigins of StuckOrigins of Stuck--FaultsFaultsFaults Functional vs. Structural Functional vs. Structural Functional vs. Structural Functional vs. Structural Carry Arvind . Computer Science & Artificial Intelligence Lab. Massachusetts Institute of Technology. February 22, 2012. L05-. 1. http://csg.csail.mit.edu/6.S078. Combinational IFFT:. Suppose we want to reduce the area of the circuit. Sequential Circuits. Part 1. KFUPM. Courtesy of Dr. Ahmad . Almulhem. Objectives. Sequential Circuits. Storage Elements (Memory). Latches. Flip-Flops. KFUPM. Combinational vs Sequential. A . combinational. Example of a Sequential Circuit. D flip-flops. Example: . Start with A=0, B=0, x=0.. A(next)=0. B(next)=0. Y(next)=0. What . are. . A(next), . B(next) and y(next) . given that A=1, B=1 and X=1?. D flip-flops. Latches, Flip-Flops and Decoders. Sequential Circuit. What does this do?. The OUTPUT of a sequential circuit is determined by the current output values from a previous operation.. . In other words the output is a part of the input. . CPU’s . program counter (PC) . register has address . i . of the . first . instruction. Control circuits “fetch” the contents of the location at that address. The instruction is then “decoded” and executed. Montek Singh. Aug 27, 2014. 2. Today. Digital Circuits (review). Basics . of Boolean Algebra (review). Identities and Simplification. Basics of Logic Implementation. Minterms. and . maxterms. Going from truth table to logic implementation. 1. Date. Day. Class. No.. Title. Chapters. HW. Due date. Lab. Due date. Exam. 17 . Nov. Mon. 22. Combinational Logic. 13.3 – 13.5. LAB 10. 18 . Nov. Tue.  . 19 . Nov. Wed. 23. Sequential Logic. 14.1. COE . 202. Digital Logic Design. Dr. . Muhamed. . Mudawar. King Fahd University of Petroleum and Minerals. Presentation Outline. Introduction to Sequential Circuits. Synchronous versus Asynchronous. © . 2014 . Project Lead The Way, Inc.. Digital Electronics. Combinational Logic. Design Process. Version #1. Word Problem. Write Logic Expression. Boolean Simplification. AOI Logic. Implementation. COE . 202. Digital Logic Design. Dr. . Muhamed. . Mudawar. King Fahd University of Petroleum and Minerals. Presentation Outline. Analysis of Clocked Sequential circuits. State and Output Equations. State Table.