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Geyser-1, a prototype MIPS R3000 CPU with fine grain runtime PG for major computational components in the execution stage is available. Function units such as CLU, shifter, multiplier and divider are power-gated and controlled at runtime such that only the function unit to be used is powered-on to minimize the leakage power. The evaluation results on the real chip reveals that the fine grain runtime...
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...
This paper describes a design and implementation methodology for fine-grain power gating. Since sleep-in and wakeup are controlled in a fine granularity in run time, shortening the transition time between the sleep and active states is strongly required. In particular, shortening the wakeup time is essential because it affects the execution time and hence does the performance. However, this requirement...
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