Power-gating is one of the most promising and widely adopted solutions for controlling sub-threshold leakage power in nanometer circuits. Although single-cycle power-mode transition reduces wake-up latency, it develops large discharge current spikes, thereby causing IR-drop and inductive ground bounce for the neighboring circuit blocks, which can suffer from power plane integrity degradation. We propose a new reactivation solution that helps in controlling power supply fluctuations and achieving minimum reactivation times. Our structure limits the turn-on current below a given threshold through a sequential activation of the sleep transistors (STs), which are connected in parallel and sized using a novel optimal sizing algorithm. We also introduce a distributed physical implementation, which allows minimum layout disruption after ST insertion and minimizes routing congestion.
Design of a Flexible Reactivation Cell for Safe Power-Mode Transition in Power-Gated Circuits / Calimera, Andrea; Benini, L; Macii, Alberto; Macii, Enrico; Poncino, Massimo. - In: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS. I, REGULAR PAPERS. - ISSN 1549-8328. - 56:9(2009), pp. 1979-1993. [10.1109/TCSI.2008.2010151]
Design of a Flexible Reactivation Cell for Safe Power-Mode Transition in Power-Gated Circuits
CALIMERA, ANDREA;MACII, Alberto;MACII, Enrico;PONCINO, MASSIMO
2009
Abstract
Power-gating is one of the most promising and widely adopted solutions for controlling sub-threshold leakage power in nanometer circuits. Although single-cycle power-mode transition reduces wake-up latency, it develops large discharge current spikes, thereby causing IR-drop and inductive ground bounce for the neighboring circuit blocks, which can suffer from power plane integrity degradation. We propose a new reactivation solution that helps in controlling power supply fluctuations and achieving minimum reactivation times. Our structure limits the turn-on current below a given threshold through a sequential activation of the sleep transistors (STs), which are connected in parallel and sized using a novel optimal sizing algorithm. We also introduce a distributed physical implementation, which allows minimum layout disruption after ST insertion and minimizes routing congestion.Pubblicazioni consigliate
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https://hdl.handle.net/11583/1857495
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