We describe a stochastic circuit generator that can be used to automatically create benchmark circuits for use in FPGA architecture studies. The circuits consist of a hierarchy of interconnected modules, reflecting the structure of circuits designed using a system-on-chip design flow. Within each level of hierarchy, modules can be connected in a bus, star, or dataflow configuration. Our circuit generator is calibrated based on a careful study of existing system-on-chip circuits. We show that our benchmark circuits lead to more realistic architectural conclusions than circuits generated using previous generators.
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