كتاب 04 – Combinational Logic BY :M. Morris Mano

04 – Combinational Logic BY :M. Morris Mano Chapter 4 Combinational Logic 4.1 INTRODUCTION Logic Mtsfo r digital syems may be combinational or sequential. A combinational circuit consists of logic gates whose outputs at any time ace determined from only the went combination of inputs. A co~onacilrc uit performs an operation that can k qecifd logidy by a set of Bmlm functions. In conuast, sequential circuiki employ storage elements in addition to logic gntes. Their outputs are a function of the inputs and the sm of the storage elements. Because the state of the storage elements is a function of previous inputs, the outputs of a scqusntial cirmit depnd not only on present valw of inputs, but also on past inputs, and the circuit behavim must be specfled by a time saquence of inputs and internal statcs. Sequential circuits are the building blmks of digital systems and are discussed in Chqms 5.8, and 9. 4.2 COMBINATIONAL CIRCUITS A cmbimtid circuit consists of input variables, logic gates, and output v-lcs. hti& lo& gates react to the values of the signals at thtir inputs and produce the value of the output signal, rransfwming binary information from the given input data to a requid output dais. A block dagmn of a combinational circuit is shown in Fig. 4,1, The n input binary variables come hm an external source; the m output variables are produced by the intend combhahnal logic circuit and go to an external destination. Each input and output variable exists physically as an analog signal whose values are htqreted to be a biisi gnal that qmmts logic 1 and logic 0. (Note: bgic gicslmula show only 0's and I's, not the actual analog signals.) In many application& the source and destination am storage registers. If the re&m are included with the combinational gates, then the total cWmu st be considered to be a qdalci rcuit.
إم موريس مانو - ❰ له مجموعة من الإنجازات والمؤلفات أبرزها ❞ Introduction Digital Design M. Morris Mano ❝ ❞ Solution Manual – Digital Design 4th Ed - MorrisMano P1-P294 ❝ ❞ 02 – Boolean Algebra and Logic Gates ❝ ❞ Digital Design With an Introduction to the Verilog HDL FIFTH EDITION ❝ ❞ 10 – Digital Intergrated Circuts BY :M. Morris Mano ❝ ❞ 12 – Standard Graphic Symbols BY :M. Morris Mano ❝ ❞ M. Morris Mano 01 – Digital Systems and Binary Numbers ❝ ❞ 13 – Index BY :M. Morris Mano ❝ ❞ 09 – Asynchronous Sequential Logic :M. Morris Mano ❝ ❱
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