共查询到16条相似文献,搜索用时 140 毫秒
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高级数据链路控制(HDLC)协议是在数字通信领域中广泛应用的协议之一,用以在远程用户之间实现资源共享和信息交互。HDLC协议是一种面向比特流的数据链路层协议,其特点有高效性、可靠的透明传输以及强大的差错检测功能。文章介绍了HDLC协议的帧结构,并研究了HDLC协议在发送端如何组帧以及接收端实现解帧的过程,提出一种利用FPGA编程实现HDLC协议的硬件处理方法,将编写的代码下载到Xilinx FPGA芯片中并测试通过,证实了HDLC协议利用FPGA实现的可行性。与HDLC专用芯片相比,该方法可靠性高、灵活性好以及实现简单,具有良好的应用前景。 相似文献
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雷达数据协议转换器是空管多雷达处理系统的重要组成部分。它将多路HDLC协议的雷达数据转换成单路IP数据,然后传入多雷达数据处理系统,避免系统为引接多路雷达数据而安装多个HDLC串口卡,较少的接线提高了系统可靠性。该设计提出了一种基于FPGA+STM32的雷达数据协议转换器设计方案,利用FPGA在并行处理方面的优势实现多路HDLC雷达数据的实时采集,FPGA与STM32之间采用串口协议进行通信,由STM32控制W5500以太网芯片完成数据的协议转换。最后,通过实验验证了该设计的可行性和有效性。 相似文献
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Kobayashi K. Kameyama M. Higuchi T. 《Industrial Electronics, IEEE Transactions on》1997,44(3):418-426
A new token-passing mechanism, priority token passing, which features real-time access and fast detection and recovery of transmission errors, is discussed in detail in comparison with standard token-passing protocols, and its large-scale integration (LSI)-oriented design concept is described. Priority token passing includes only a small performance overhead, due to its switching functions, which can change network topology from ring to broadcast medium. A token-holding node passes the token to another node after determining the successor through priority comparison. Errors occurring during token passing can, thus, be detected and corrected simply and promptly. Priority token passing has a simple hardware implementation, requiring only small additions to the frame control circuitry, and has a small implementation overhead. The priority token-passing protocol and two other important network communication functions, dual ring network reconfiguration and high-level data link control (HDLC) normal response mode-based message transmission, are designed as a single finite-state machine, and implemented into a compact LSI chip. This integrated instrument network (IINET) chip provides complete network communication services and requires only three additional external electronic components for operation 相似文献
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A data link control protocol for low earth orbit satellite networks has been developed to overcome throughput limitations inherent in event-based positive acknowledgment automatic-repeat-request class protocols. This was accomplished by relaxing a reliability constraint, specifically, the in-sequence delivery constraint. This relaxation results in a new class of link layer service, that of reliable datagram, and permits a fresh approach to link layer protocol design. The authors present one such protocol, the low altitude multiple satellite data link control (LAMS-DLC) protocol. They derive the throughput efficiency of LAMS-DLC and compare the results with HDLC (selective reject). The analysis is verified using an event-based simulation. Measurements suggest that LAMS-DLC provides near optimal throughput efficiencies in the target environment, while using significantly less buffer space than that required for HDLC-SREJ 相似文献
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在AdHoc网络技术的工程实现中,路由协议的选择以及硬件无线通信系统设计是要解决的两个关键环节。本文针对节点之间无等级结构的AdHoc网络,基于一种泛搜索路由协议进行AdHoc网络系统设计和实现。硬件通信设备采用单片机C8051F920控制无线数传模块的方案进行设计,按照搜索路由协议对单片机编写程序,继而组建AdHoc网络系统。通过对网络测试所得的数据结果进行分析,表明该路由协议能适应网路拓扑结构变化,准确地找到一条适合传输的路由,所设计通信系统满足AdHoc网络的基本特征。 相似文献
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本文针对多媒体传感器网络的典型应用智能家居系统,抽象出系统模型.为使网内多媒体数据方便快捷地提供给用户,设计了支持连接外部多种异构网络的网关.网关在接入PSTN网络的设计中,我们采用HDLC(高级数据链路控制)协议以确保数据信息的可靠互通,并基于FPGA技术设计和实现了HDLC控制协议.进而,为了提高HDLC芯片的处理效率,接收缓存设计为一个多Block FIFO模式,支持多个Block的并行读写.本文设计的多Block接收缓存,包括独立BRAM和共享BRAM两种方式,旨在适应多种需求,并有效减少对CPU的中断.最后,我们通过Modelsim对基于FPGA的HDLC芯片进行仿真,验证读写控制、收发、时隙、中断等功能,并且在实际测试板上运行测试通过. 相似文献
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A new wide-area data network is described. The network employs packet switching techniques within a multi-access, narrowband cellular radio environment and provides a flexible alternative to copper wire telecommunications for short data message applications. Following a discussion of the network requirements, the paper describes the key design areas in terms of a layered model. A new data link layer protocol called dynamic slotted reservation Aloha is introduced. This protocol is optimised for the bidirectional communication of packets containing around 1000 bits of application data. The practical implementation is presented briefly before a number of the major applications are discussed 相似文献