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- W2912887622 abstract "Field-programmable gate arrays (FPGAs) are used for a wide variety of computations in low-cost embedded systems. Although these systems often have modest performance constraints, their energy consumption must typically be limited. Many FPGA applications employ repetitive loops that cannot be straightforwardly split into parallel computations. Performing a loop sequentially generally requires high-speed clocks that consume considerable clock power and sometimes require clock generation using a phase-locked loop (PLL). Loop unrolling addresses the high-speed clock issue, but its use often leads to significant combinational glitch power. In this work, a computer-aided design (CAD) approach that unrolls loops for designs targeted to low-cost FPGAs is described. Our approach considers latency constraints in an effort to minimize energy consumption for loop-based computation. To reduce glitch power, a glitch-filtering approach is introduced that provides a balance between glitch reduction and design performance. Glitch-filter enable signals are generated and routed to the filters using resources best suited to the target FPGA. Our approach automatically inserts glitch filters and associated control logic into a design prior to processing with FPGA synthesis, place, and route tools. Our energy-saving loop-unrolling approach has been evaluated using five benchmarks often used in low-cost FPGAs. The energy-saving capabilities of the approach have been evaluated for an Intel Cyclone IV and a Xilinx Artix-7 FPGA using board-level power measurement. The use of unrolling and glitch filtering is shown to reduce energy by at least 65% for an Artix-7 device and 50% for a Cyclone IV device while meeting design latency constraints." @default.
- W2912887622 created "2019-02-21" @default.
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- W2912887622 date "2018-12-31" @default.
- W2912887622 modified "2023-09-24" @default.
- W2912887622 title "Loop Unrolling for Energy Efficiency in Low-Cost Field-Programmable Gate Arrays" @default.
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- W2912887622 doi "https://doi.org/10.1145/3289186" @default.
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