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