6.1网络营销概述 6.1.1网络营销基本概念 一、网络营销的定义 网络营销,英文为 Cybermarketing,或 Online marketing是在计算机网 络,特别是Internet技术和电子商务系统出现后所产生的新型营销方式。广义 地说,凡是借助 Internet、计算机通信和数字交互式媒体为主要手段,以整合 营销、直复营销、软营销理论为指导思想,为达到一定营销目标而进行的营销 活动,都可称之为网络营销

本章详细介绍了TMS320C54x中主机接口HPI、定 时器、串行接口和中断系统。 主机接口HPI是TMS320C54x系列定点芯片内部具 有的一种接口部件,主要用于DSP与其他总线或CPU进 行通信

INTRODUCTION Level five Complex Systems, Function Units from levels Two through Four Level four More complex Function Logic Units, e.g. microprocessor Third IC level (VLSI) Level three Function Logic Units, e.g. adders, Second IC level counters, multiplexers (MSI and LSI) Level two Function Logic Units, e.g. gates, NOT, AND, NAND, EX-OR First IC level (SSI)

Hazard o Boolean algebra does not account for propagation delays through signal paths of actually circuits. o The delay can cause glitches to occur. A glitch is an unwanted signal, usually short pulse caused by the transient behavior of signal path that have different delays A hazard exists any time the potential for glitches is present

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

FLIP-FLOPS Flip-flops are digital devices that have the ability to store binary information after the excitation input has changed. They are considered to be the basic memory cell for the majority of electronic binary data storage applications. This section explores the flip-flop from a functional perspective

Let be the set of all input variables, X={, X1, .Xn} Let y be the set of all output variables, y={Y, 1 ...m} o The combinational function, F, operated on the input variable set, to produce the output variable set y. o The output is related to the input as

Positional Number System Number system use positional notation to represent value. The position of the character(numeral) in a character string (collection of possible numerals) indicate value as well as the character itself. Radix (base) is the number of numeral characters in the character set of positional number system. Position Weiaht is a constant that represents the value of a position. Different position has different weight. It is the integer power of radix

6.1 寄存器的功能与使用方法 6.1.1基本寄存器 6.1.2移位寄存器 6.2 寄存器应用实例 6.3 寄存器IC简介 6.2.1 产生序列信号 6.2.2 用移位寄存器计数 6.2.3 用移位寄存器分频

逻辑(A&F):事物的因果关系,即输入、输出之间变化的因果关系。 逻辑事件(A、F):有且仅有两个相互对立的状态,且必定出现两个状态中的一个