共查询到20条相似文献，搜索用时 78 毫秒
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论述了Linux下RTL8019芯片的硬件结构,工作原理,在此基础上提出了RTL8019网卡芯片驱动程序的实现方案,使其在Linux嵌入式系统开发平台上能正常工作。 相似文献
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介绍以太网的帧结构和控制芯片RTL8019AS的结构特性,用51单片机控制RTL8019AS实现以太网通讯的硬件设计方案,采用汇编语言实现ARP协议(地址解析协议),并进行了系统的调试与验证.用8位89C51单片机和RTL8019AS以太网控制器,在脱离PC机的前提下,使实验设备接入校园网,实现实验室设备与校园网之间的通信. 相似文献
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"箱式"实验设备的广泛使用不利于学生实际动手能力和经验的积累,因此开发了以太网MAC(me-dium access corltrol)层协议实验板.论述了以太网MAC层协议帧格式、各字段的作用和开发MAC层实验板的目的,并对MAC层实验的所需设备组成和功能、MAC层实验板结构组成和主要模块作用进行了简要论述.它的应用提高了学生对网络理论知识的应用能力和实际动手能力. 相似文献
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嵌入式网络接口是嵌入式系统和网络相连的关键部分.详细给出了用微处理器EP7312和网络接口芯片RTL8019AS相结合实现的以太网接口驱动程序的实现过程以便方便、低廉地将信息传送到世界上的任何地方. 相似文献
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介绍了一种基于DSP和单片机构成的一种语音压缩和网络传输系统,其电路简单、稳定可靠、成本低廉、具有一定的实用性。语音压缩和网络传输系统主要由语音压缩部分和网络传输两部分构成,语音压缩部分由DSP芯片CT8022,语音A/D MC14LC5480等构成,语音A/D把输入的模拟音频信号转换成PCM码流,DSP芯片将PCM码流压缩成符合ITU-G.723.1标准的语音数据包;网络传输部分由单片机ATm ega64和以太网控制芯片RTL8019等构成,单片机负责把DSP压缩好的语音数据按照UDP格式封装并将封装好的数据包传送给以太网控制芯片RTL8019,最后通过路由发送到以太网指定的计算机上。 相似文献
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介绍了以DSP为核心具有以太网接口的系统的硬件电路组成和软件设计方法。对系统硬件设计进行了介绍,详细地介绍了网络控制器RTL8019AS的工作原理及DSP硬件电路设计。在DSP中实现了简化的TCP/IP协议栈,通过软件编程实现数据包的接收与发送。该系统可以将数据按照网络协议处理,实现数据的以太网传输。 相似文献
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黄振宇 《河南职业技术师范学院学报》2011,(5):75-78
单片机与PC机的通信有十分重要的实际意义.通过分析简化TCP/IP协议,使用KEILC51编制程序实现TCP/IP协议,并采用RTL8019AS芯片设计制作连接单片机与PC机连接的硬件电路,对单片机与PC机间的通信进行了研究.在对TCP/IP深入分析基础上,简化TCP/IP协议栈并嵌入到51单片机中,结合硬件电路进行了单片机端的IP设置、ping命令的使用,实现了单片机与PC主机的通信连接. 相似文献
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以一款NAND型flash存储器芯片为例,论述了用c语言如何设计数据读写程序的详细过程． 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献