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Various core-based power evaluation approaches for microprocessors, caches, memories and buses have been proposed in the past. We propose a new power evaluation technique that is targeted toward peripheral cores. Our approach is the first to combine for peripherals both gate-level-obtained power data with a system-level simulation model written in an object-oriented language. Our approach decomposes peripheral functionality into so-called instructions. The approach can be applied with three increasingly fast methods: system simulation, trace simulation or trace analysis. We show that our models are sufficiently accurate in order to make power-related system-level design decisions but at a computation time that is orders of magnitude faster than a gate-level simulation.