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Description: RS－485串行总线接口标准以差分平衡方式传输信号，具有很强的抗共模干扰的能力，允许一对双绞线上一个发送器驱动多个负载设备。工业现场控制系统中一般都采用该总线标准进行数据传输，而且一般采用RS－485串行总线接口标准的系统都使用8044芯片作为通信控制器或各分机的CPU。8044芯片内部集成了SDLC，HDLC等通信协议，并且集成了相应的硬件电路，通过硬件电路和标准协议的配合，使系统的通讯准确、可靠、快速。8044在市场上日渐稀少，虽然有8344可替代，但几百元的价位与普通单片机几元至几十元的价位相差甚远，用户在开发一般的单片机应用系统时，都希望能用简单的电路和简单的通信协议完成数据交换。譬如：利用单片机本身所提供的简单串行接口，加上总线驱动器如SN75176等组合成简单的RS－485通讯网络。本文所述的方法已成功地应用于工程项目，一台主机与60台从机通讯，通讯波特率达64KBPS。
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Size: 40721 |
Author: Jack |
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Description: HDLC通信模块发送接收模块VHDL源码-HDLC communication module to send receiver module VHDL source code
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Size: 3072 |
Author: ditto |
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Description: RS－485串行总线接口标准以差分平衡方式传输信号，具有很强的抗共模干扰的能力，允许一对双绞线上一个发送器驱动多个负载设备。工业现场控制系统中一般都采用该总线标准进行数据传输，而且一般采用RS－485串行总线接口标准的系统都使用8044芯片作为通信控制器或各分机的CPU。8044芯片内部集成了SDLC，HDLC等通信协议，并且集成了相应的硬件电路，通过硬件电路和标准协议的配合，使系统的通讯准确、可靠、快速。8044在市场上日渐稀少，虽然有8344可替代，但几百元的价位与普通单片机几元至几十元的价位相差甚远，用户在开发一般的单片机应用系统时，都希望能用简单的电路和简单的通信协议完成数据交换。譬如：利用单片机本身所提供的简单串行接口，加上总线驱动器如SN75176等组合成简单的RS－485通讯网络。本文所述的方法已成功地应用于工程项目，一台主机与60台从机通讯，通讯波特率达64KBPS。-err
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Size: 40960 |
Author: Jack |
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Description: SDLC DEVELOPMENT
SOFTWARE CYCLES
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Size: 20480 |
Author: sriram |
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Description: The Software Development Life Cycle (SDLC)
For Small To Medium Database Applications
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Size: 68608 |
Author: brethurtkid |
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Description: Software development life cycle
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Size: 13312 |
Author: girish kumar k |
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Description: The document tells various testing types and techniques carried out for entire SDLC phases.
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Size: 33792 |
Author: S.Iswariya |
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Description: 本论文以西电基础教学实验中心学生上机管理系统为背景，论述了管理信息系统的概念，结构及系统开发的基本原理和方法。全文共分为绪论、开发方法的选择、系统分析、系统设计、系统实施、结束语等六章。首先论述了该系统的开发背景和系统的简单介绍；然后，讨论了结构化生命周期法、原型法和面向对象这三种开发方法的技术，根据需要选择合适的开发方法；结合本系统详细阐述了系统分析、系统设计的技术及应用，尤其在机房管理人员和上机人员的交流方面采用了C/S结构进行解决；此文还论述了在开发过程中遇到的问题及学到的东西。通过开发这个机房学生上机管理系统，进一步明确了开发研制一个管理信息系统的方法和思想，加深了对管理信息系统的认识，巩固了以前所学的信息系统开发方面的知识，提高了软件开发的水平，为今后在工作岗位上学好用好计算机打下了坚实的基础。- The paper is based on the student operate cumputer management of Basic Teaching Experiment Center of Xidian Uniersity,It discusses the concept and method about MIS(management information system) and the basic theory and method about system develop,The whole paper can be divided into six chapters including Introduction,the option of Developing Method,Systems Analysis,Systems Design,the Realication of System, Tag and so on.First of all,it discussis develop background and synopsis of this system then,it discussis three technologies of developing methods,namely,it involves in the way of SDLC(StructuredDevelopment Life Cycle),the way of Prorotype,the way of OO(Object Oriented),and the way of this system it elaborately expound the technologies and appviation of Systems Analysis and System Design,especially the communion between Management and Students by meas of C/S(Client/Server) it also discussis the question and the knowledge during develop this system during develop this system, I under
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Size: 1950720 |
Author: 邱江 |
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Description: this is an sdlc flow,to learn the steps and process of sdlc
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Size: 3072 |
Author: usman |
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Description: Report on Software Development Lifecycle
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Size: 43008 |
Author: Mayank |
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Description: It is used for different communication modules for SDLC,GSM/GPRS,PSTN and also included socket communication
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Size: 3072 |
Author: ram |
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Description: 状态机程序设计,学习协议的制订；掌握状态机程序设计方法；在232通信接口的基础上如何实现链路层功能，实现一个简化的SDLC协议。-State machine programming, learning agreement developed master state machine programming method in 232 communication interface, based on how link layer functions, to achieve a simplified SDLC protocol
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Size: 220160 |
Author: 石魁 |
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Description: software engineering sdlc choices proce-software engineering sdlc choices process
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Size: 4096 |
Author: Gabriel |
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Description: A software development process, also known as a software development life-cycle (SDLC), is a structure imposed on the development of a software product. Similar terms include software life cycle and software process. It is often considered a subset of systems development life cycle. There are several models for such processes, each describing approaches to a variety of tasks or activities that take place during the process. Some people consider a life-cycle model a more general term and a software development process a more specific term. For example, there are many specific software development processes that fit the spiral life-cycle model. ISO/IEC 12207 is an international standard for software life-cycle processes. It aims to be the standard that defines all the tasks required for developing and maintaining software.-A software development process, also known as a software development life-cycle (SDLC), is a structure imposed on the development of a software product. Similar terms include software life cycle and software process. It is often considered a subset of systems development life cycle. There are several models for such processes, each describing approaches to a variety of tasks or activities that take place during the process. Some people consider a life-cycle model a more general term and a software development process a more specific term. For example, there are many specific software development processes that fit the spiral life-cycle model. ISO/IEC 12207 is an international standard for software life-cycle processes. It aims to be the standard that defines all the tasks required for developing and maintaining software.
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Size: 117760 |
Author: hitchi |
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Description: Systems Analysis and Design with
UML Version 2.0
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Size: 449536 |
Author: Anum |
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Description: this one is SDLC about the quality issurance
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Size: 565248 |
Author: atif mehmood |
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Description: SDLC is the acronym of Software Development Life Cycle. It is also called as Software development process. The software development life cycle (SDLC) is a Framework defining tasks performed at each step in the software development process.
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Size: 21504 |
Author: Ahmad Asad |
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Description: 模拟交通信号灯，红绿灯，包含程序和protues仿真(sas sa sas ad wdas d sa dsa d sadsa da dsa d ad dsa as as as cd cdcs dc dc d cs dc sc s dc dsc sdc sdc sldc slc sdlc sdlc sdlc sdlcalv sdcl dlv adlv slc)
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Size: 31744 |
Author: 化身孤岛的鲸
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