Power Gating with Multiple Sleep Modes

  • Authors:
  • Kanak Agarwal;Kevin Nowka;Harmander Deogun;Dennis Sylvester

  • Affiliations:
  • IBM Research, Austin, TX;IBM Research, Austin, TX;University of Michigan, Ann Arbor, MI;University of Michigan, Ann Arbor, MI

  • Venue:
  • ISQED '06 Proceedings of the 7th International Symposium on Quality Electronic Design
  • Year:
  • 2006

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Abstract

This paper describes a power gating technique with multiple sleep modes where each mode represents a trade-off between wake-up overhead and leakage savings. We show that high wake-up latency and wake-up power penalty of traditional power gating limits its application to large stretches of inactivity. Our simulations and data traces show that multiple sleep mode capability provides an extra 17% reduction in overall leakage as compared to single mode gating. The multiple modes can be designed to allow state-retentive modes. The results on benchmarks show that a single state-retentive mode can reduce leakage by 19% while preserving state of the circuit.