NDLI: Design Exploration of a Thermal Management Unit for Dynamic Control of Temperature-Induced Clock Skew

Content Provider	IEEE Xplore Digital Library
Author	Duraisami, K. Sithambaram, P. Sathanur, A. Macii, A. Macii, E. Poncino, M.
Copyright Year	2007
Description	Author affiliation: Dip. di Automatica e Informatica, Politecnico di Torino (Duraisami, K.; Sithambaram, P.; Sathanur, A.; Macii, A.; Macii, E.; Poncino, M.)
Abstract	Power densities and temperatures in today's high performance circuits have reached alarmingly high levels due to increased scaling in feature sizes. Subsequently, the various techniques used to keep them under control have also created "zones" of varying temperatures, thus contributing to temperature gradients inside the chip. These gradients have detrimental effects on the delay of wires, as resistance in metals increases with temperature. Clock nets are extremely susceptible to this effect, since they run through the entire chip. Different techniques have been proposed to counter the impact of temperature on clock speed; they range from re-designing the clock network assuming a stationary profile to more adaptive solutions that allow to dynamically compensate the clock skew through replacement of the original buffers with a specially designed counterpart, called tunable delay buffers (TDBs). Dynamic skew management based on TDBs calls for the presence on the chip of a thermal management unit (TMU), whose purpose is that of periodically choosing the actual delay that each TDB must provide in order to achieve skew optimization. Preliminary implementations of such a unit for basic assumptions on the distribution of sensors and their accuracy have indicated negligible impact on the original design. This work aims at exploring in detail several issues related to TMU design, pivoting on the fact that sensor distribution and its accuracy could in fact impact the design in a significant way depending on the design. We provide the results of a careful exploration we have performed on a meaningful case study, quantifying values for area and power consumption.
Starting Page	1061
Ending Page	1064
File Size	644991
Page Count	4
File Format	PDF
ISBN	1424409209
DOI	10.1109/ISCAS.2007.378192
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-05-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermal management Temperature control Clocks Energy management Automatic control Circuits Delay effects Wires Energy consumption Geometry
Content Type	Text
Resource Type	Article

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