Sub-Row Sleep Transistor Insertion for Concurrent Clock-Gating and Power-Gating

  • Karthikeyan Lingasubramanian
  • Andrea Calimera
  • Alberto Macii
  • Enrico Macii
  • Massimo Poncino
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6951)


Concurrent clock gating (CG) and power gating (PG) can help to tackle both static and dynamic power simultaneously, thereby enabling the design of low-power and energy efficient applications. Unfortunately the automatic integration of the two techniques in standard design flows is limited by several technical impediments. Among them, physical constraints during the Sleep Transistor Insertion (STI) imposed by row-based layout rules are certainly the most critical. Although determining the feasibility of the whole clock-gating and power-gating (CG-PG) integration, the adopted STI methodology may have drastic effects on several circuit metrics, like operating frequency, throughput and power savings. In this paper we introduce a layout-friendly STI approach for fine-grained CG-PG inclusion. The proposed method, that is aware of the timing-driven strategies adopted by most of the commercial placer tools, allows sub-row insertion of independent sleep-transistor cells, therefore enabling finer resolution in the CG-PG integration, along with minimal cell displacement and negligible layout disruption. This enables a larger number of cells to be power-gated (i.e., larger potential power-savings w.r.t. state-of-the-art fine-grained STI strategies), without delay overhead. Experimental results, conducted on a set of circuit benchmarks mapped onto an industrial 65nm technology, indicate that more than 50% of the total number of cells can be clock- and power-gated simultaneously, without any speed degradation.


Idle Condition Very Large Scale Integration Sleep Signal Sleep Transistor Clock Gating 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Karthikeyan Lingasubramanian
    • 1
  • Andrea Calimera
    • 1
  • Alberto Macii
    • 1
  • Enrico Macii
    • 1
  • Massimo Poncino
    • 1
  1. 1.Dipartimento di Automatica e InformaticaPolitecnico di TorinoTorinoItaly

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