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.

• Type: Conference
• Year: 2008
• Where: ICCD
• Authors: Steven Huntzicker, Michael Dayringer, Justin Soprano, Anthony Weerasinghe, David Money Harris, Dinesh Patil
• Keywords: 32-bit Static Barrel, Hardware, ICCD 2008, Multiplexer Valency, Static Multiplexer Stages