Novel Approximate Data Bus Inversion Design with Enhanced Majority Detection Accuracy

초록

Data bus inversion (DBI) reduces energy consumption by minimizing data transitions between the current and previous data. However, conventional DBI tends to cause significant hardware overhead, primarily due to the complex majority voter in the DBI encoder. In low switching cost applications, the energy overhead caused by high hardware complexity can exceed the energy savings achieved by the DBI technique. To reduce high hardware complexity for enabling the use of DBI even in applications with low switching cost, a DBI encoder employing the AOI-AOI approximate majority voter has been proposed. However, AOI-AOI suffers from low accuracy in determining the majority decision. To address this issue, we propose a novel approximate majority voter which improves the accuracy of majority decision while maintaining low hardware complexity. As a result, our proposed DBI encoder with the improved approximate majority decision achieves a higher switching activity reduction of 10.75% than that of AOI-AOI (10.39%). In addition, compared to the accurate DBI encoder, the proposed encoder reduces delay by > 31 %, area by > 17%, and power consumption by > 32%. © 2025 IEEE.

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