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1、太原理工大学工程硕士研究生学位论文ii基于 EMMA2SE 平台的 PVR 机顶盒文件存储系统设计与实现摘 要近几年来，随着数字电视在我国的大力普及，用户对数字电视的要求越来越高。从目前用户的需求来看，数字电视主要有两个发展方向，一是能为用户提供高质量、高清晰度画面的数字高清电视（High DefinitionTelevision，HDTV） ；再就是为用户提供多种创新的服务，个人视频录像机（Personal Video Record，PVR）就是其中之一。与普通机顶盒相比，PVR 机顶盒最大的特点是加入了大容量的硬盘，并且围绕着大容量的硬盘衍生出许多新的技术，如节目录制、节目预定、定时录制、
2、TimeShift 等。而这些新技术的实现都依赖于一个稳定、优化、高效率的文件系统来对硬盘进行有效的管理，所以文件系统是否稳定与可靠就成了 PVR 稳定和可靠的关键。本文作者的研究课题是以 NEC 的 EMMA2SE 多媒体处理器为硬件平台和Nucleus PLUS为软件平台，研究和开发 PVR 机顶盒的文件系统。该项目是在国家广电总局直播星“村村通”计划的基础上的开发，日前样板机已经通过广电总局的认可。本文是作者对“PVR 机顶盒开发设计”项目的总结，文中简要介绍了 PVR 机顶盒的结构、基本功能和原理，详细介绍磁盘管理以及 PVR 机顶盒文件系统的设计。关键词：PVR，EMMA2SE，FA
3、T32，TIMESHIFT，NUCLEUS FILE太原理工大学工程硕士研究生学位论文iiiThe Design and Implementation of File System for PVR Set-top Box Based on EMMA2SEPlatformABSTRACTIn recent years, wth the strong popularity of digital television in ourcountry, the user requirements for digital television had become moresophisticated. Fr
4、om the current needs of the users, there were two majordirection of development for digital TV. The first one was to provide the userswith high-quality, high-definition digital high definition television screen (HighDefinition Television, HDTV), the other with a variety of innovative services,and PV
5、R Set-Top was one of them.Compared with the ordinary set-top boxes, the biggest feature to PVR set-top box was that it had a large-capacity hard disk, and around the large-capacityhard drive PVR leads to many new technologies, such as program recording,program reservation, time recording, and time s
6、hift and so on. The realization ofthese new technologies relied on a stable, optimized, highly efficient file systemto effectively manage the hard disk, so the table and reliable file systemdetermined the stability and reliability of PVR Set-Top.The topics of this paper was the research and developm
7、ent of PVR set-topboxes file system based on NEC research EMMA2SE multimedia processor forthe hardware platform and software platform for Nucleus PLUS. This projectwas developed based on the live stars “Every Village“ project proposed by theState Administration of Radio Film and Television, and the
8、Machine model hadbeen recognised recently. The paper was the summary of “PVR set-top boxdesign“ project, and described the following content in detail: the structure,basic features and principles of PVR, disk management and the design of PVRfile system.KEY WORDS: pvr, emma2se, fat32, timeshift, nucl
9、eus plus太原理工大学工程硕士研究生学位论文IV图目录图 1-1 双高频头 PVR 机顶盒原理框图.4图 2-1 32 位 MIPS 处理器存储映射9.8图 2-2 内存地址译码9.10图 2-3 EMMA2SE 的硬件模块结构图10. 11图 2-4 EMMA2SE 双核心结构图 .13图 2-5 EMMA2SE 处理器的 IDE 接口.14图 3-1 硬盘内部结构.15图 3-2 硬盘磁头及附属组件.16图 3-3 硬盘盘片.17图 3-4 40 针 IDE 硬盘接口.27图 4-1 Flash 地址重映射.33图 4-2 stage1 程序设计流程图.35图 4-3 stage2 程序设计流程图.36图 4-4 PVR 实时文件系统的地位.37图 4-5 硬盘空间划分.39图 4-6 引导扇区结构17.40图 4-7 FAT 截图.43图 4-8 根目录截图.45图 4-9 查找长文件名流程.47图 4-10 格式化后硬盘空间分布.58图 4-11 分区组成.59图 4-12 存储系统层次结构图.
