For applications like MPEG video processing, video games, and AC-3 audio processing, multimedia systems must meet stringent performance specifications and have low cost and high programmability. Dedicated LSI chips and conventional processors with multimedia enhanced instructions have had some success but stilllackeitherinflexibility or in performance [l, 21.Anattractive approach for the multimedia system is to use a basic dual-issue RISC architecture. This approach has the advantage ofbeing easy to program for multimedia applications.
A single chip system for real-time encoding and decodmg for MPEG2, except for motion estimation, can be created by integrating two 250MHz dual issue RISC processor cores with a small dedicated hardware for the variable length encodingldecoding (VLCIVLD) and block loading process. The estimated area for the encoder, 27.7"' using a 0.3-micrometer CMOS process, is 20% smaller than that of the dedicated hardware approach. An approach that uses dual issue RISC processors has the advantage of a smaller chip area and also that of being very easy to program for multimedia applications.
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