ST 公司的STi5197是用于STB 的低成本QAM解调器和MPEG2译码器.在单片IC内集成了QAM解调器,FEC,多流传输分路器,应用CPU,音频/视频译码,视频处理,图像和显示,先进的安全特性,STB外设,音/视频DAC,数字音/视频输出,USB 2.0主控制器/ULPI以及以太网 MAC MII/MRII.本文介绍了STi5197的主要特性,方框图以及典型应用框图,包括MPEG2广播线缆STB框图(Basic Zapper), 带HDD的MPEG2双调谐混合/DVR线缆STB框图,带DVB-CI插座的MPEG2 广播线缆STB框图,和带嵌入DOCSIS 线缆调制解调器的MPEG2互动STB框图.
STi5197: Low-cost QAM demodulator and MPEG2 decoder for set-top box applications
The STi5197 integrates in a single IC, QAM demodulation, FEC, Multi-stream transport demultiplexing, an applications CPU, audio/video decode, video processing, graphics and display, advanced security, STB peripherals, audio/video DACs, digital audio/video outputs, USB 2.0 host controller/ULPI and an Ethernet MAC MII/RMII.
STi5197主要特性:
■ ITU-T J83 Annexes A/B/C, DVB-C compliant
■ 256 QAM demodulation and FEC sub-system
■ MPEG2 MP@ML video decoding
■ Audio decoding (MPEG1, 2, MP3, Dolby Digital 5.1)
■ Optional feature: BTSC stereo encoding
■ Linux and OS21 compatible ST40 applications CPU (350 MHz)
■ 16-bit SDR/DDR1 compatible local memory interface
■ Multi-stream, DVR capable, transport stream processing
■ Extensive connectivity (USB 2.0 host/ULPI, Ethernet MAC MII/RMII, DVB-CI)
■ Advanced security features, compatible with the latest CA requirements
■ Cable STBs can be produced with very small BOM and two-layer PCBs
■ Active and passive low power modes
■ Integrated voltage regulator
■ Two package options: PBGA 23 x 23 and LFBGA 15 x 15
图1. STi5197方框图
图2. MPEG2广播线缆STB框图(Basic Zapper)
图3.带HDD的MPEG2双调谐混合/DVR线缆STB框图
图4.带DVB-CI插座的MPEG2 广播线缆STB框图
图5.带嵌入DOCSIS 线缆调制解调器的MPEG2互动STB框图
