On the Premises and Prospects of Timing Speculation
Rong Yea, Feng Yuanb, Jie Zhangc and Qiang Xud
CUhk REliable Computing Laboratory (CURE), Department of Computer Science & Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong.
Timing speculation (TS), being able to detect and correct circuit timing errors at runtime, is a promising alternative solution to mitigate the ever-increasing variation effects in nanometer circuits. The potential energy-efficiency improvement, however, is limited by the circuit ‘timing wall”, a critical operating point caused by conventional circuit optimization techniques (e.g., gate sizing). With a given circuit netlist, we study the bound of the potential benefits provided by TS techniques in this work, which facilitate designers to decide whether it worths the effort to implement a timing-speculative circuit. Experimental results on benchmark circuits demonstrate the effectiveness of the proposed methodology.
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