One of the crucial issues in on-chip bus serialization is the increased power consumption, In general, the on-chip bus serialization tends to dissipate more energy than parallel communications due to the bit multiplexing. This paper proposes a bus coding method for low-power on-chip bus serialization. This encodes bus signals prior to serialization so that the bus signals are converted into signals that do not much increase in the transition frequency by making the best use of word-to-word and bit-by-bit correlations presented in original parallel signals. The method is applied to revision of a VC-1 multimedia processor and the simulation results show that the proposed method saves about 43% of power consumption.