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This paper uses extensive traces to explore the parallel architectures of highly programmable Video Signal Processors (VSPs). First we briefly compare some existing architectures. Based on the parallel property of video applications, a general Very Long Instruction Word (VLIW) paradigm is proposed. Then we use a new technique, trace-driven architectural exploration, to evaluate architectures with different parameters such as number of registers, number and type of functional units, and number of pipeline stages, et al. Focusing on video applications, we have analyzed the traces of H.263, MPEG-2 and MPEG-4 video codecs. The results show us which architectural tradeoffs enhance the overall performance in the application domain and how we should balance processor resources among registers, functional units and memory units.

Trace-driven studies of VLIW video signal processors