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In a 32btimes32b multiplier, when the bit width of both operands is less than 16-bit, the upper array of the multiplier computing the upper bits of the product does not need to operate and hence consumes wasteful leakage energy. We propose a technique to control run-time power gating (RTPG) for the upper array by dynamically detecting the operand width. Since RTPG suffers from energy overhead due...
A fine-grain dynamic power gating is proposed for saving the leakage power in MIPS R3000 by sleep control and applied to a processor pipeline. An execution unit is divided into four small units: multiplier, divider, shifter and other (CLU). The power of each unit is cut off dynamically, based on the operation. We tape-outed the prototype chip Geyser-0, which provides an R3000 Core with the power reduction...
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