博通BCM3552单片DTV解决方案

        Broadcom 公司的BCM3552/BCM3553是WXGA和全高清（ HD） 1080P  DTV片上系统，它集成了有线和地面电视的4/1024-QAM，8/16- VSB接收器，带外QPSK接收器，NTSC解调器，两个DVI/ HDMI接收器。

        一个传输处理器，一个数字音频处理器，一个高清(HD) MPEG视频译码器，2D图像处理，模拟视频和音频数字处理，模拟视频数字化和DAC功能，立体声高保真音频DAC，一个330-MHz MIPS处理器，以及提供多种电视控制功能的外设控制单元。本文介绍了BCM3552/BCM3553的主要特性和优势，方框图以及系统应用方框图。

        BCM3552/BCM3553 WXGA AND FULL HD 1080P DIGITAL TV SYSTEM-ON-CHIP SOLUTIONS
The BCM3552/BCM3553 combines a cable/terrestrial 4/1024-QAM and 8/16- VSB receiver, an out-of-band QPSK receiver, NTSC demodulator, two DVI/ HDMI receivers, a transport processor, a digital audio processor, a high-definition (HD) MPEG video decoder, 2D graphics processing, digital processing of analog video and audio, analog video digitizer and DAC functions, stereo high-fidelity audio DACs, a 330-MHz MIPS processor, and a peripheral control unit providing a variety of television control functions. The cable/terrestrial receiver directly samples a tuner output with an A/D converter. It digitally resamples and demodulates the signal with recovered clock and carrier timing, filters and equalizes the data, and passes soft decisions to an ATSC A/53 and ITU-T J.83 Annex A/B/C compatible decoder. A CEA/EIA-909 smart antenna interface is included on chip. The out-of-band receiver digitizes a SAW centered IF. It demodulates the signal with recovered clock and carrier timing, filters and equalizes the data and incorporates a DigiCipher® II/ DAVIC-compatible FEC decoder. The common hardware interface provides a direct interface to a MCard/CableCard device. The BCM3552/BCM3553 has an MPEG-2 DVB compliant transport processor with advanced section filtering capability, DVB descrambler, MPEG-2 (MP@HL profile) video decoder. Audio is support includes both a BTSC/Korean A2 audio decoder and a Dolby AC3/MPEG-2 Layer 1, 2, audio decoder with Trusurround XT support. The BCM3552/BCM3553 provides analog and digital audio/video outputs. Single (for WXGA) and dual (for Full HD 1080p) link LVDS transmitters provide direct digital connection to panel displays. A NTSC/PAL video encoder analog output with Macrovision (optional) provides analog video for VCR out support. A SPDIF output and a pair of analog outputs (L-R) are provided via the integrated audio DACs. The NTSC analog video decoder supports motion adaptive deinterlacing and 3D comb filtering including 1080i deinterlacing. Direct PC input up to UXGA 1600 x 1200 is supported with auto phase and mode detection. Two independent HDMI receivers each support 1080p 60 fps inputs. The BCM3552/BCM3553 includes Broadcom’s advanced 2D graphics processing. Two transport stream inputs, one ISO7816 smart card interface, and a high-speed interface supporting IEEE 1394 is included. The BCM3552/ BCM3553 incorporates a complete MIPS32™-based microprocessor subsystem including caches with bridging to memory and a local bus, where external peripherals can be attached. Integrated peripherals include two USB 2.0, three UARTs, counter/timers, GPIO, keypad, LED, IR Tx/Rx, IR Keyboard, BSC, and SPI controllers.

        主要特性：

        BCM3552 WXGA support and BCM3553 full HD 1080p support 
        1080i/p Motion Adaptive Deinterlacing 
        NTSC/PAL decoders each with a 3D comb
        Direct PC input support up to 1600x1200 UXGA 
        Dual HDMI/DVI 1080p 60 fps inputs 
        Six 10-bit A/Ds each with a 8:1 input switch 
        Integrated dual-link LVDS transmitters 
        Integrated Video Processing 
        Auto flesh, green boost, black stretch, histogram equalization, blue shift, and sharpness capability 
        Full 10-bit video processing 
        3:2 pull down 
        Analog Noise Reduction 
        Multiframe Per Pixel Motion Adaptive Deinterlacing 
        Extensive audio support 
        Five-band audio equalizer 
        Independent audio output controls for analog and digital outputs 
        Integrated BTSC and A2 audio decoder 
        Integrated audio DACs 
        Dolby Digital, TrusurroundXT, MPEG audio decoder 
        Integrated NTSC demodulator 
        Integrated ATSC/QAM receivers 
        Dual USB 2.0 
        On-chip 330 MHz 32-bit CPU
       

        所具备的优势：

        WXGA and full HD 1080p support options on a single chip 

        Dual 1080p 60 fps HDMI receivers provides connectivity to highest quality consumer electronic products 

        Integrated single/dual-link LVDS transmitters provide direct connection with WXGA/full HD 1080p panels 

        PEP advanced video signal processing provides an elevated viewing experience through edge and color enhancements. 

        Motion adaptive per-pixel deinterlacing 

        Direct PC input support with auto phase and mode detection reduces system design cost and complexity 

        3D comb filters with per-pixel adaptive motion detection delivers excellent Y/C separation. 

        On-chip high-quality video scaling provides non-linear conversion of 4:3 images for display on 16:9 televisions. 

        Full 10-bit video support preserves signal integrity and image quality. 

        Superior ATSC signal reception and demodulation under both static and dynamic multipath conditions. 

        Comprehensive integration of A/Ds and DACs supports direct audio/ video inputs/outputs, simplifying system design and cost.

图1 BCM3552/BCM3553方框图

图2 BCM3552/BCM3553应用方框图

本文来源：Broadcom公司    作者：

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