Digital system: entity can process, transfer and store any kind of digital signals is Composed of individual digital logic circuits which are designed to perform specified function

第5章组合逻辑设计实践(二) 一、文档标准和电路定时 二、常用的中规模组合逻辑器件

第5章组合逻辑设计实践(一) 一、文档标准和电路定时 二、常用的中规模组合逻辑器件

Binary Arithmetic Binary arithmetic Addition - Augend+addend+carry-in Sum ....carry-out Subtraction - Minuend-subtrahend-borrow-in difference ...borrow-out

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

FLIP-FLOPS Add the certain combinational logic circuit to the input of the original flip- flop New

Basie cCoucept Boolean algebra (Logic algebra) is closure mathematical system that defines a series of logic operation (and, or, not) performed on set k of variables (a, b,...) which can only have two values of 0 or 1

Karnaugh maps It is a matrix of squares. each square represent a minterm or maxterm from a Boolean equaTion N-variable karnaugh map have 2 squares The binary numeral on the sides of k-map is the variable coordinates

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)

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