西安电子科技大学通信工程学院信息论与编码理论（研究型）课件Chapter4 Solving Larger Problems.pptVIP

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西安电子科技大学通信工程学院信息论与编码理论（研究型）课件Chapter4 Solving Larger Problems.ppt

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The three steps of analysis are listed as follows: Example 4.2: analyze behaviors of Fig. 4.0.3. Requiring: (1) S and Cout considered individually . (2) S and Cout considered as a whole. Example 4.3: Analyze the function of Fig. 4.0.4. 4.1 Design (Synthesis) of Combinational Circuits 组合电路设计（综合） This section will present the design process of digital circuits and examples. Digital circuits are designed by transforming a word descriptions of function into a set of logic equations and then realizing the equations with logic elements. The design process for combinational circuits is shown as follows : (see P17-19) 1: Represent each of the inputs and outputs in variable. 2: Formalize the design specification either in the form of truth table or of algebraic expressions. 3: Simplify the description (algebraic expressions) in terms of gates . 4: Implement the circuits with components. Example 4.1.1 : Design a full subtracter, that is a circuit which computes a-b-c, where c is the borrow from the next less significant digit and produces a difference , D, and a borrow, P from the next more significant bit. (P275 Solved Problems 1.) ? Solution 2:? Example 4.1.2 : Design a logic circuit to realize that a single light (that can be on or off) can be controlled by any one of four switches . Solution: (1) formalizing truth table (2) simplifying logic expression (3) drawing the logic circuit There are many other examples in P277-3, P291-11 and P299-12 . Exercise : Analyze the function for each of following circuits. The classification of digit elements (components):1: SSI (small scale integration)—gates2: MSI (medium scale integration)—single function module such as Adder, Decode, Encode, Multiplexer Comparator, ROM,PLA,PAL ,Counter , shift-register 3: LSI (large sca