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1 Introduction 1.1 wide application of digital home Digital technology and rapid development of computer technology is continuously produced a large number of digital products, from personal computers, mobile phones, PDA to MP3, digital TV, DVD, DV / DC, digital home appliances have entered people's daily life. The same time, broadband communications and the popularity of Internet applications has greatly promoted the development of digital media content. Therefore, in building a broadband access, interconnect, content sharing of digital home media centers become increasingly prominent demand. Definition according to IDC, the digital home is one that can achieve control of all facilities within the family can get feedback, audio, text, images, information can be shared in various home appliances, and may at any time to achieve such control Information sharing \ [1 \]. IDC's latest report shows that the digital home market to 2008, brought directly to the network, terminal and other related hardware / software investment will be more than 10 billion U.S. dollars, of which two-way boxes installed in 2008 about 3,300 million units, the annual compound growth rate will reach 311.7 %, smart home gateway because of its high-end digital home solutions, market position, from 2003 to 2008 compound annual growth rate will reach 89.4% \ [1 \]. Therefore, the promotion of digital home media center will be a tremendous additional value, a huge potential for development. Since 1994, the birth of the concept of the digital home, today the official launch of the digital home market; from "Venus" project launched to Universal Plug and Play Forum (UPnP, UniversalPlug and Play), Digital Living Network Alliance (DLNA, Digital Life NetworkAlliance) the establishment, after more than ten years of development, digital life has entered a period of real development. 1.2 ARM technology Embedded systems since the 80's from 8-bit microcontroller technology. In the late 90s, with the rapid development of network technology, people's daily life into the post-PC era, many electronic devices require TCP / IP networking and more intelligent, more powerful computing capabilities, such as voice, audio, video, data acquisition, processing and transmission, graphical interface and touch screen technology, wireless control technology and the corresponding software agreement. Therefore, the more powerful the needs of embedded processors are becoming increasingly prominent. ARM embedded system field, as the most widely used 32-bit processor architecture, has been all over the industrial control, consumer electronics, communications systems, network applications, wireless communications, imaging, and security and other kinds of applications, and a number of applications in the field of standard CPU, ARM technology has permeated every aspect of people's lives. ARM technology with intellectual property (IP) core microprocessors currently include: ARM7 family, ARM9 series, ARM9E series, ARM10E series, SecurCore series, StrongARM and XScale family series. Their common features are: small size, low power consumption, low cost, high-performance; support the Thumb (16 ) / ARM (32 bit) dual instruction set, is well compatible with 8 / 16 bit devices; extensive use of registers, instruction execution faster; most of the data operations are completed in the register; addressing modes simple and flexible, and high efficiency; instruction length is fixed. In addition to these common features in addition, each family also has its own characteristics and applications. Which, ARM7, ARM9, ARM9E and ARM10E to four general-purpose processors, each family offers a relatively unique properties to meet the needs of different applications; SecurCore series specifically for high security applications and design, such as e-commerce, e-government, electronic banking, network and certification systems in the field; Intel Corporation Intel StrongARM series combines the design and processing technology and power efficiency ARM architecture, the software is compatible ARMv4 architecture, but also used Intel itself has the advantage of technology for portable communications and consumer electronics; Intel's XScale family are based on ARMv5TE architecture solution with high performance, high cost, low power consumption for digital mobile phones, personal digital assistants and network products and other fields. 2 digital home media center system design Consumer electronics devices with the increasing demand (such as digital cameras, digital cameras, MP3 players and HD DVD and other equipment) and the Internet's rapid development of digital media, home networking in the digital media content beginning continued to grow, people are more urgently needed to increase communication and information sharing and other capabilities. In order to meet the digital media inside and outside the Internet in the home and share the full circulation of the demand, we developed a cost-effective digital home media center system (DHMCS, DigitalHome Media CenterSystem). The system combines Intel's IXP network processor and ESS multimedia decoding chips, seamlessly connect home PCs and home appliances within, and through Ethernet / Wireless network connection outside the home, broadband Internet, in the family environment / outside the sharing of digital media content, be able to manage a variety of media formats, store, display and distribution, to provide integrated data, multimedia applications, and automatic control and remote management function. DHMCS Figure 1 describes the overall framework of the system. It is through the DHCP protocol, PPPoE protocol, UDP protocol, FTP protocol, HTTP protocol, UPnP protocol \ [2 \] and the USB interface, from home PC, broadband Internet connection in the network, memory cards and DVD and other devices for multimedia data, and these digital media content on the TV and the audio device. It also provides media management and remote control functions. The overall framework of Figure 1 DHMCS system 2.1 DHMCS system structure DHMCS consists of two subsystems: one is by the IXP 425 (IntelXScale series) network processors, a network subsystem; the other is constituted by the ESS 6688DVD decoder chip decodes the data subsystem, hereinafter referred to as " IXP subsystem "and" ESS subsystem. " IXP subsystem through the UDP protocol, FTP protocol, HTTP protocol and the UPnP protocol, access media data from the network; ESS subsystem is to decode the data on these media and audio / video output, while also on the memory card and DVD on Play resources for processing. IXP ESS subsystem by subsystem and I2C Bus and dual-port SRAM (DPRAM We are high quality suppliers, our products such as super absorbing polymer , China oil absorbing polymer for oversee buyer. To know more, please visits water gel crystals.
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