global and scalable architecture the TL855 is an integrated mpeg-2 mp@hl 4:2:2 video decoder, display processor and graphics accelerator for professional advanced digital television. it complies with all atsc/arib/dvb-hd/directv ? -hd recommended performance metrics and supports direct video output to a variety of display types. it performs professional quality decoding (4:2:2) of a single hd pr ogram (mp@hl). an integrated graphics accelerator renders text and graphics to an independent on-screen display (osd) bitmap. the ic buffers the audio data, allowing the use of a standard dolby digital (ac-3) decoder chip or software on a host cpu for audio decoding. the TL855 accepts mpeg compressed data encoded in the 4:2:2 format. four y, two cb and two cr values are generated for every four pixels decoded. compared to 4:2:0 decoding, 4:2:2 decoding generates two extra chroma components requiring a considerable increase in performance over 4:2:0 consumer decoders. therefore the TL855 memory interface, the mpeg decoder core engine and the display controller must be highly tuned for 4:2:2 processing. the memory interface has twice the buffering of conventional 4:2:0 decoders to handle the extra amount of chroma component during writes and reads. the mpeg decoder engine decodes the extra chroma values. the display controller accepts 4:2:2 data from the sdram as decoded by the mpeg decoder engine, then displays this higher quality video on the screen. the TL855 is able to process all atsc, dvb-hd and arib formats (and other worldwide and proprietary decoding such as directv) in high quality 4:2:2 video and then display the resultant video at this quality. in addition to the mpeg-2 4:2:2 decode, the tl850 performs format convers ion from any atsc format to any other atsc format (including many non-standard resolutions). an on-chip 2d graphics accelerator provides tv-centric graphics and osd to complement the video quality. a pci interface allows ease of interfacing to a variety of common off-the-shelf components suitable for professional systems. in addition to these functions the TL855 can be programmed into a 4:2:0 mode of operation. all format video/graphics solution for studio or professional quality equipment TL855 professional digital tv decoder 5.1 channel 5.1 channel mpeg transport data qpsk, qam or vsb receiver pci bus 32 64 8 16mb - 64mb sdram tl 855 rgb or ypbpr and sync i 2 s digital rf studio source audio decoder hdtv audio dacs ! iec958 TL855 system diagram integrated circuits tera3359.sellsheets.ics 12.15.00 10:45 am page 7
copyright 2000. teralogic, inc. all rights reserved worldwide. teralogic and the teralogic logo are registered trademarks of te ralogic, inc. janus is a trademark of teralogic, inc. all other trademarks are properties of their respective owners and are acknowledged. 1 1/00 - 5k teralogic, inc. 1240 villa street mountain view ca 94041 tel 650.526.2000 fax 650.526.2006 www.teralogic.tv integrated circuits applications professional/broadcast stb professional video decoding/editing systems ad insertion systems digital cinema supporting teralogic products cougar pro development platform tl81x stb/pvr controller ics programmable transport demultiplexer atsc/dvb-hd/directv-hd compliant glueless interface to most front-end ics maximum input bit rate of 135 mbits/sec supported high-performance 4:2:2 digital video decoder mp@hl mpeg2 4:2:2 decoder all atsc/arib/dvb/ directv compliant decode formats decodes one 4:2:2 hd (mp@hl) stream at a time decodes and displays hd content in 4:2:2 mode for professional applications accelerated 2-d graphics full alpha blend support up to 32 bpp graphics in rgb memory controller 64-bit wide sdram interface programmable clock generator up to 64 mbytes addressing range pci bus interface 32-bit interface 66 mhz or 33 mhz bus clock pci slave capability supported dma master capability over pci bus supported (4:2:0 mode only) video decode and display of 4:2:0 content supports video decode and display of 4:2:0 content as specified in the tl850 specification. extra features are enabled in this mode such as extra graphics modes. see the tl850 product brief for the full list of features enabled. technology 2.5-v core, 3.3-v i/o, 0.25-m cmos 348-pin ball grid array package high-performance display processor multiple output display formats supported, including 1920x1080i, 1280x720p, 704x480p and 704x480i many nonstandard input and output formats supported up/down conversion of source to selected display format graphics overlay plane with up to 8-bits per pixel and global alpha blending analog rgb or ycrcb output for hdtv display support for smpte 274m-, smpte 296m-, smpte 293m-, and eia 770-compatible tri-level sync on analog output 16- or 24-bit digital video output in ycrcb or rgb mode audio processing audio stream play from memory audio mix, cross-fade and attenuate between sources six-channel audio output iec-958 formatted output supported provides audio rate buffer supports audio and video pts synchronization TL855 professional digital tv decoder 2d graphics memory pci bus TL855 memory controller pci controller sd/hd transport stream digital hd video analog hd out (rgb/yp b p r ) audio out (i 2 s and iec958) display processor ? all formats ? 1080i, 720p, 480p, 480i transport demultiplexer ? atsc ? arib ? dvb ? directv audio processor/ mixer 32 digital video decoder ? m p@hl mpeg2 4:2:2 decoder ? decodes all 18 atsc formats ? atsc, dvb, arib, directv compliant TL855 block diagram tera3359.sellsheets.ics 12.15.00 10:45 am page 8
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