Computer Science – Hardware Architecture
Scientific paper
2007-10-25
Dans Design, Automation and Test in Europe - DATE'05, Munich : Allemagne (2005)
Computer Science
Hardware Architecture
Submitted on behalf of EDAA (http://www.edaa.com/)
Scientific paper
In this paper, we investigate the impact of T_{ox} and Vth on power performance trade-offs for on-chip caches. We start by examining the optimization of the various components of a single level cache and then extend this to two level cache systems. In addition to leakage, our studies also account for the dynamic power expanded as a result of cache misses. Our results show that one can often reduce overall power by increasing the size of the L2 cache if we only allow one pair of Vth/T_{ox} in L2. However, if we allow the memory cells and the peripherals to have their own Vth's and T_{ox}'s, we show that a two-level cache system with smaller L2's will yield less total leakage. We further show that two Vth's and two T_{ox}'s are sufficient to get close to an optimal solution, and that Vth is generally a better design knob than T_{ox} for leakage optimization, thus it is better to restrict the number of T_{ox}'s rather than Vth's if cost is a concern.
Bai Robert
Kgil Tae Ho
Kim Nam-Sung
Mudge Trevor
Sylvester Dennis
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