We revisit voltage partitioning problem when the mapped voltages of functional units are predetermined. If energy consumption is estimated by formulation E=CV2, a published work claimed this problem was NP-hard. We clarify that it is polynomial solvable, then propose an optimal algorithm, its time complexity is O(nk+k2d) which is best so far, where n, k, and d are respectively the numbers of functional units, available supply voltages, and voltages employed in the final design. In reality, considering leakage power the energy-voltage curve is not simply monotonically increasing and there is still no optimal polynomal polynomial time algorithm. However, under the assumption that energy-voltage curve is quasiconvex, which is also a good approximation to actual situation, the optimal solution can be got in time O(nk2). Experimental results show that our algorithms are more efficient than previous works.
|ホスト出版物のタイトル||Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI|
|出版ステータス||Published - 2010|
|イベント||20th Great Lakes Symposium on VLSI, GLSVLSI 2010 - Providence, RI|
継続期間: 2010 5月 16 → 2010 5月 18
|Other||20th Great Lakes Symposium on VLSI, GLSVLSI 2010|
|Period||10/5/16 → 10/5/18|
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