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Geyser-2 is the second prototype MIPS CPU which provides a fine-grained run-time power gating (PG) controlled by instructions. Geyser-l, the first prototype only provides the fine-grained run-time PG core. Although it demonstrated the leakage power reduction on a real chip, the operational frequency is limited at 60MHz because of the limitation of the I/O speed. Geyser-2 with cache and TLB mechanism...
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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