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In this paper we propose an on-chip bus PMU which makes accurate estimates of system power consumption from a first-order linear power model by utilizing system-level activity information exchanged on the on-chip bus. It can easily be customized for different on-chip and off-chip memory devices, and is not dependent on a specific CPU core. We model memory devices using energy state machines, describe them in XML, and use that description automatic synthesis of the PMU.We compare the short-term accuracy of the proposed PMU with a cycle-accurate system-level power estimator, and assess its long-term accuracy with a real hardware prototype. Experimental results show that the the power estimation deviates less than 5% from real measurements.