The embedded CPU is the heart of the set-top box. When the data is decoded by the channel, it must first be demultiplexed, divide the transmission stream into video and audio, and separate the video, audio and data. More than 32 CPUs can be integrated in the CPU for the set-top box. The PID filter is programmed, two for video and audio filtering and the rest for PSI, SI and Private data filtering. The CPU is the operating platform of the embedded operating system. It must complete network management, display management, conditional access management (IC card and smart card), teletext decoding, data decoding, OSD, and video signal up and down with the operating system. And other functions. In order to achieve these functions, many new functions must be extended on a common 32- to 64-bit CPU, and the speed must be continuously increased to meet the requirements of high-speed networks and three-dimensional games.
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