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This paper surveys the state-of-the-art and pending challenges in MPSoC design. Standards in communications, multimedia, networking, and other areas encourage the development of high-performance platforms that can support a range of implementations of the standard. A multiprocessor system-on-chip includes embedded processors, digital logic, and mixed-signal circuits combined into a heterogeneous multiprocessor. This mix of technologies creates a major challenge for MPSoC design teams. We will look at some existing MPSoC designs and then describe some hardware and software challenges for MPSoC designers.