【作者】 杨永；

【导师】 刘铁根；

【作者基本信息】 天津大学 ， 光学工程， 2007， 硕士

【摘要】 随着嵌入式系统中图像数据流传输对带宽需求的日益增加,研究新型高带宽、经济、灵活的传输平台,实现图像数据流的高速传输,具有重要的实际意义和研究价值。论文致力于将千兆以太网技术应用于嵌入式图像处理系统,构建基于高速DSP的千兆以太网嵌入式系统,弥补国内千兆以太网技术在嵌入式系统中应用的不足,把系统的通信速率提高到1000Mbps,为图像数据流传输提供高性价比的信息交换模式。研究将有效促进嵌入式图像处理系统在工业在线检测、智能控制等领域的应用。鉴于嵌入式系统资源有限性与千兆通信速度下TCP/IP协议管理庞大性之间的尖锐矛盾,论文设计了新型的高速DSP+千兆以太网控制器的系统结构,采用DSP管理通信协议,控制千兆以太网控制器处理复杂的网络运算,使系统能够在低DSP占用率下,维护千兆速度传输。论文的主要工作内容包括:(1)在实验室研制成功的DSP中央控制电路板基础上,研究新型的基于高速DSP的千兆以太网嵌入式系统整体结构。将系统架构在PCI通信总线之上,利用PCI总线的高速特性,减轻DSP和千兆以太网控制器之间速率瓶颈对系统最高通信速率的限制。(2)根据TCP/IP原理,研究DSP与千兆以太网控制器的联合工作机制。在数据收发过程中,有效使用硬件机制实现TCP/IP功能,减轻DSP资源消耗。配置、维护接收描述符和发送描述符,减少数据传输过程中的控制信息对PCI总线带宽的消耗,从而减轻软件部分对系统最高通信速率的限制。(3)根据系统的数据最高通信速率瓶颈,建立基于高速DSP的千兆以太网嵌入式系统模型速率模型,使用Matlab仿真系统的最高速率曲线,选取典型的工作参数,计算了基于高速DSP的千兆以太网控制器嵌入式系统的最高通信速率。系统最高通信速率的理论分析与仿真表明:在优化的工作参数配置下,系统最高工作速率可以达到949Mbps。更多还原

【Abstract】 With the increasing requirement for high bandwidth in the embedded image processing system, an economy, agility, high-speed transport platform that goes long distances, supports all sorts of networking and processing options, has an important impact on image stream transmission. The embedded image processing system can integrate with the advanced gigabit Ethernet technology very well, by this way, the speed of the system can be increased to 1000 Mbps. Therefore, the embedded gigabit Ethernet system can be widely used in Embedded Industry production-line Imaging Examination System area, and intelligence measurement etc.This paper investigates the embedded gigabit Ethernet system based on high-speed digital signal processor. Since the digital signal processor has limited resource, it is incapable of realizing the complex TCP/IP protocol, a new structure consist of high-speed DSP and gigabit Ethernet controller is designed in this paper. The work has been done as follows:(1) Develop the whole structure for the embedded gigabit Ethernet system based on high-speed digital signal processor. Investigate the PCI communication circuit for the central control unit and the gigabit Ethernet control unit, thus, relieve the communication speed restriction through high-speed bus.(2) The high-speed DSP is used to control the gigabit Ethernet controller based on the TCP/IP protocol. The purpose-build hardware helps to alleviate the burden of DSP. By this way, the system can achieve high bandwidth with limited CPU utilization. In order to control the function of the gigabit Ethernet controller, DSP use a structure ring to manage Receive Descriptor and Transmit Descriptor, thus, relieve the system speed restriction through software function.(3) Build the maximum system speed module according to the bottleneck speed of the system. With the help of Matlab, the curve of the maximum system speed can be acquired, and, therefore, the system’s important parameters are optimized. Finally, based on the model, the maximum speed of the device’s can reach 949Mbps.更多还原