A function is a term used in mathematics and logic to denote a relationship between input and output variables. Each variable is restricted to binary (0, 1) values The relationship is the complex of three primitive functions (And \\Not\\Or)

一、电力线和变压器的运行状况的计算和分析 二、简单电力网络的潮流分布和控制

simple counters Counting is a fundamental function of digital circuits. A digital counter consists of a collection of flip-flops that change states (set or reset) in a prescribed sequence

第七章半导体存储器 存储器—用以存储二进制信息的器件。 半导体存储器的分类: 根据使用功能的不同,半导体存储器可分为两大类: (1)随机存取存储器(RAM)也叫做读/写存储器。既能方便地读岀所存数据,又能随时写入新的数据。RAM的缺点是数据易失,即一旦掉电,所存的数据全部丢失 (2)只读存储器(ROM)。其内容只能读出不能写入存储的数据不会因断电而消失,即具有非易失性。存储器的容量:存储器的容量=字长(n)×字数(m)

Synchronous sequential circuit memory, usually consisting of flip-flops, update circuit states information All flip-flops share a common clock pulse input The clock input is not a binary value representing the time of day but rather a\synchronous\train of pulses. Synchronous memory changes its data only at certain time intervals The flip-flops can change state only on a clock pulse edge

Analysis Analyze existing circuits to determine their function Synchronous sequential circuit The basic modeling structure Two circuit models: Mealy model& Moore model Three approach used to describe the circuit: Logic function equation

第四章组合逻辑模块及其应用 4.1编码器 一编码器的基本概念及工作原理 编码——将特定的逻辑信号编为一组二进制代 码。 能够实现编码功能的逻辑部件称为编码器。 一般而言,N个不同的信号,至少需要n位二进制 数编码

Sequential Circuit Models Yo Combinational logic Universal combinational circuit model No memory units No feedback from logic outputs back to the inputs

Registers, formed from collection of flip -flops, are used to store or manipulate data or both. Input and output function associated with registers include Parallel input/ Parallel output Serial input/ Serial output Parallel input/ Serial output OSerial input parallel output

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