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| BCM7041 (R) SIMULTANEOUS DUAL-CHANNEL DIGITAL VIDEO/AUDIO ENCODER FEATURES SUMMARY OF BENEFITS * Simultaneous dual-channel, single-chip, NTSC/PAL MPEG-2 * encoding system Dual channel MP@ML MPEG-2 video encoder * Variable resolutions: Horizontal: 720, 704, 640, 544, 480, 360, 320, 160 Vertical: 480, 240, 112 (NTSC); 576, 288, 144 PAL * Variable frame rate, up to 30(NTSC)/25(PAL) fps * Supports constant/variable bit rates: 1 - 24 Mbps * Variable GOP length and structure: I, IP, IPB, IPBB * +/-100 pixels wide motion estimation search range * Automatic 3/2 pulldown detection * Video input; selectable 8/10 bits CCIR656 * 4:2:2 to 4:2:0 conversion Dual-channel, high-fidelity 24/56 bits programmable audio DSP * MPEG-1 layer II stereo encoding * Dolby Digital (AC-3) stereo encoding * Programmable frequencies and bit rates (64 - 384 Kbps) Highly programmable system multiplexing processor * Ability to multiplex up to four inputs to one or two multiplexed streams * CBR/VBR Program/Transport stream multiplexing * User data / VBI insertion * Programmable stream parameters Dual-channel video pre-processing * 7-tap vertical/horizontal luminance/chrominance filter Accurate 27 MHz video/audio/PCR timestamps for exact video/ audio synchronization during playback Dual-channel dedicated serial/parallel DVB transport stream interface Dual-channel I2S/AC-97 stereo audio inputs Generic Host interface Integrated I2C controller Package: 256-pin BGA Supply voltage: 1.8/3.3V (5V compatible) Power consumption: less than 1.5 W System memory: SDRAM, 1 or 2 modules of 2Mx32 * Fully integrated dual-channel MPEG-2 digital audio/video * * * * encoder and audio/video multiplexer in a single chip drastically reduces overall system and development costs. Dual encoder enables simultaneous time shifting of one channel and recording of another channel. Video/audio elementary, video/audio packetized elementary, program, and transport streams generated internally to the BCM7041. Broadcom fourth generation production/field-proven and inproduction technology. Universal compatibility through standards compliance: Meets key video encoding (ISO/IEC 13818-2), audio encoding (ISO/ IEC 11172-3, MPEG-1, Layer II and Dolby digital AC-3) and system multiplexing (ISO/IEC 13818-1). Broadcom-developed reference design kit includes application board, sample application, and drivers based upon industrystandard operating systems, enabling rapid and streamlined software and hardware development, reducing time to market. Simple system design: BCM7041 + 1 or 2 modules SDRAM. * * * * APPLICATIONS * Time shift/personal video recording (PVR): * Set-top box * Stand-alone PVR * Television set * DVD recorder * Digital VCR (VCR replacement) * * * * * PCI 32 bit/33 MHz, PCI DMA master or PCI slave and 16 bit * * * * * * PC TV tuner * Digital camcorder * Video transmission: * Video over IP * Video conferencing * Security and surveillance System Block Diagram Video x 2 2M x 32 2M x 32 BCM7041 Audio x 2 Compressed Data (DVB) Output PCI/Generic Interface OVERVIEW BCM7041 Block Diagram PCI/Generic Global Controller SDRAM Interface SDRAM Controller Video in CCIR656 Video Input Buffer Multiplexer Compressed Video/Audio Output Stream Motion Estimator Signal Proc. Core RISC Signal Proc. Audio Proc. Video Bitstream Proc. Audio in 2 I S/AC97 The BCM7041 is a highly integrated dual-channel, single-chip NTSC/ PAL MPEG-2 encoder system. Integrated features in the BCM7041 include two MPEG-2 video encoders, two high-fidelity audio encoder DSPs supporting both MPEG-1 layer II and Dolby digital AC-3 encoding and an adaptable system multiplexer capable of generating one or two MPEG-2 program and transport streams. In addition, the BCM7041 integrates video pre-filtering modules, I2C controller, dual PCI/Generic bus interfaces, I2S/AC-97 audio input interfaces, and two dedicated compressed data/DVB interfaces. CCIR-656 digital video is delivered to the BCM7041 video input and pre-filtering units. The digital video is filtered, optionally decimated from Full D1 to lower resolutions, and passed to the video encoders. The video encoders support bit rates of 1 Mbps up to 24 Mbps. The 100 pixels motion estimation, in combination with sophisticated scene complexity analysis algorithms, variably change the bit rate to ensure the best possible video quality even in low video bit rates. Also supported are 3/2 pull down detection, variable GOP structure, and VBI insertion. I2S/AC-97 digital audio is delivered to the BCM7041 audio DSPs at a frequency of 32/44.1/48 KHz. The high-quality, 24/56-bit, fixed-point DSP encodes the audio either in MPEG-1 layer II or in Dolby AC-3 format. The MPEG implementation supports bit rates of 64 kbps - 384 kbps. The AC-3 implementation conforms to the Dolby consumer class A encoder, including support for bit rates of 64 kbps - 448 kbps, and dynamic range compression. The two compressed video streams and two compressed audio streams are delivered to a highly programmable multiplexing unit. The multiplexer combines the video and audio streams in the MPEG-2 program or MPEG-2 transport format. The multiplexer can output two multiplexed streams, each containing one video stream and one audio stream, or one multiplexed stream containing all the four input streams. Various multiplexer parameters are configurable, including SID, PID, and user-defined PAT/PMT/SDT tables. In addition, multiplexing of external user data into the transport stream is supported. The compressed stream is delivered either to a dedicated DVB interface or to the PCI/ generic host interface. Broadcom(R), the pulse logo, and Connecting everything(R) are trademarks of Broadcom Corporation and/ or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the property of their respective owners. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2004 by BROADCOM CORPORATION. All rights reserved. 7041-PB05-R 07/08/04 Phone: 949-450-8700 Fax: 949-450-8710 E-mail: info@broadcom.com Web: www.broadcom.com |
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