BCM7040 ? BCM7040 mpeg2 digital video/audio encoder ? single-chip ntsc/pal mpeg-2 encoding system 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 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)bullet highly programmable system multiplexing processor cbr/vbr program/transport stream multiplexing user data/vbi insertion programmable stream parameters video pre-processing 7-tap vertical/horizontal luminance/chrominance filter accurate 27-mhz video/audio/pcr time stamps for exact video/audio synchronization during playback dedicated serial/parallel dvb transport stream interface i 2 s/ac-97 stereo audio inputs pci 32 bit/33 mhz, pci dma master or pci slave and 16-bit generic host interface integrated i 2 c controller package: 176-pin lqfp supply voltage: i/o 3.3v (5v compatible) power consumption: less than 1w system memory: sdram, 1 module of 2m x 32 fully integrated mpeg-2 digital video/audio encoder and video/audio multiplexer in a single chip drastically reduces overall system and development costs. video/audio elementary, video/audio packetized elementary, program, and transport streams are generated internally to the BCM7040. broadcom third generation production of field-proven and in- production technology. universal compatibility through standards compliance: 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 industry- standard operating systems, enabling rapid and streamlined software and hardware development, reducing time to market. simple system design: BCM7040 + single sdram. time shift/personal video recording (pvr): set-top boxes stand-alone pvrs television sets dvd recorders digital vcrs (vcr replacements) pc tv tuners digital camcorders video transmission video over ip video conferencing security and surveillance features summary of benefits applications 2m x 32 sdram video a/d audio a/d compressed data (dvb) output pci/generic interface BCM7040 mpeg-2 encoder system block diagram
overview ? phone: 949-450-8700 fax: 949-450-8710 e-mail: info@broadcom.com web: www.broadcom.com broadcom corporation 16215 alton parkway, p.o. box 57013 irvine, california 92619-7013 ? 2004 by broadcom corporation. all rights reserved. 7040-pb07-r 07/08/04 broadcom ? , the pulse logo, and connecting everything ? 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. the BCM7040 is a highly integrated, single-chip ntsc/pal mpeg-2 encoder system. integrated features in the BCM7040 include an mpeg-2 video encoder, high-fidelity audio encoder dsp supporting both mpeg-1 layer ii and dolby digital ac-3 encoding and an adaptable system multiplexer capable of generating mpeg-2 program and transport streams. in addition, BCM7040 integrates a video pre-filtering module, i 2 c controller, dual pci/generic bus interfaces, i 2 s/ac-97 audio input interfaces, and a dedicated compressed data/dvb interface. ccir-656 digital video is delivered to the BCM7040 video input and pre-filtering unit. the digital video is filtered, optionally decimated from full d1 to lower resolutions, and passed to the video encoder. the video encoder supports 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. i 2 s/ac-97 digital audio is delivered to the BCM7040 audio dsp 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 compressed video and 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. 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. pci/generic sdram interface global controller sdram controller video input buffer multi- plexer c cir656 motion estimator signal proc. core risc signal proc. audio proc. video bitstream proc. audio in i 2 s/ac97 compresse d video/audio output strea m BCM7040 block diagram
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