Steve Huntzicker, Michael Dayringer, Justin Soprano, Anthony Weerasinghe, D. Harris, D. Patil
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Energy-delay tradeoffs in 32-bit static shifter designs
This paper compares the energy-delay tradeoff curves of 32-bit static barrel and funnel shifters. The Stanford Circuit Optimization Tool (SCOT) is used to determine best transistor sizes in a 90 nm process. The paper evaluates the effect of multiplexer valency, circuit design, and physical placement. It also quantifies the costs of various shift operations. A funnel shifter using 4- and 8-input static multiplexer stages gives the best energy-delay tradeoff, with a knee at 440 ps (15 FO4 inverter delays) consuming 0.9 pJ per shift.
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