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Partial bus-invert coding for power optimization of application-specific systems

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3 Author(s)
Youngsoo Shin ; Inst. of Ind. Sci., Tokyo Univ., Japan ; Soo-Ik Chae ; Kiyoung Choi

This paper presents two bus coding schemes for power optimization of application-specific systems: partial pus-invert coding and its extension to multiway partial bus-invert coding. In the first scheme, only a selected subgroup of bus lines is encoded to avoid unnecessary inversion of relatively inactive and/or uncorrelated bus lines which are not included in the subgroup. In the extended scheme, we partition a bus into multiple subbuses by clustering highly correlated bus lines and then encode each subbus independently. We describe a heuristic algorithm of partitioning a bus into subbuses for each encoding scheme. Experimental results for various examples indicate that both encoding schemes are highly efficient for application-specific systems.

Published in:

IEEE Transactions on Very Large Scale Integration (VLSI) Systems  (Volume:9 ,  Issue: 2 )