数字电视机顶盒的以太网接入设计与实现

Digital TV Set-Top Box Design and Implementation of Ethernet Access

为了满足家庭用户对于交互式多媒体数字电视业务的需求,设计与实现了在数字电视机顶盒上接入以太网的功能;硬件设计部分以嵌入式高速以太网接口芯片DM9000A为核心,在数字电视机顶盒硬件平台上从外围电路连接、地址空间等方面进行了设计研究;软件设计部分包括软件流程、DM9000A驱动程序的实现、LwIP协议接口设计以及应用层软件的设计。提出了系统测试方案,通过对整个数字电视机顶盒以太网接入系统功能测试结果表明,UDP传输速度可以达到20Mbps左右,接口时序的正确性达到90%以上,系统的性能稳定性强,达到了设计要求,整个系统的运行效果理想,应用前景广泛。

In order to meet home users for interactive multimedia digital TV business requirements, design and realize the access of the digital television set-top boxes to the Ethernet functionality. Hardware design of embedded high-speed Ethernet interface chip DM9000A as the core, in the digital TV set-top box hardware platforms from a peripheral circuit connection, the address space and other aspects of design studies; software design, including software processes, DM9000A driver implementation, LwIP design, and application layer protocol interface software design. Proposed system testing program, through the entire digital TV STB Ethernet access system function test results show that UDP transmission speed can reach about 20 MBPS, the correctness of the interface timing of 90% or more, the performance of the system stability is strong, has reached the design requirements, the running effect of the whole system ideal, broad prospect of application.