The content discusses an implementation of the optimal bus encoding scheme for energy-efficient data transmission over computer system buses. The key points are:
In computer system buses, most of the energy is spent on changing the voltage of each line from high to low or vice versa. Bus encoding schemes aim to improve energy efficiency by limiting the number of transitions between successive uses of the bus.
The optimal bus encoding scheme maps the information k-tuple into a binary n-tuple (codeword), where n > k, and the mapping is designed to minimize the average distance of a codeword from the previously transmitted codeword, i.e., the weight of their element-wise XOR.
The critical issue in implementing the optimal scheme is the feasibility of encoders and decoders. The content presents several implementation approaches:
The performance of the optimal bus encoding scheme is analyzed, and the energy savings compared to the uncoded case are quantified. For example, for k = 11 bits, the optimal scheme can reduce the average number of transitions by more than 50% with appropriate redundancy.
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arxiv.org
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