Boots – shoes – and leggings
Patent
1996-03-14
1998-12-08
Trans, Vincent N.
Boots, shoes, and leggings
364488, 364490, G06F 1750, G06F 1700
Patent
active
058479660
ABSTRACT:
A method of estimating power for an integrated circuit based on high speed probability calculation having a high precision with considering correlation between signals may be provided. The method may be performed by calculating probability quantity accompanying to output nodes of respective logical gates, the probability quantity being represented by probability that logical values of the output nodes of respective logical gates are 1 (referred to as "signal probability" hereinafter) and probability that logical values of the output nodes of respective logical gates are changed (referred to as "switching probability" hereinafter), expanding into series a difference P.sub.e -P.sub.a between a strict value P.sub.e of the probability quantity and a value P.sub.a calculated based on supposition that all inputs of respective logical gates are independent, with respect to the probability quantity corresponding to entire input signals of the integrated circuit, and estimating power required for the integrated circuit by first calculating infinite number of terms in the series as a correction term and then employing a value obtained by adding the correction term to the value P.sub.a as an approximate value of the probability quantity.
REFERENCES:
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Najm "Power Estimation Techniques for Integrated Circuits," IEEE, 1995, pp. 492-499.
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Tsui et al. "Exact and Approximate Methods for Calculating Signal and Transition Probabilities in FSMs," ACM/IEEE, 1994, pp. 18-23.
Monteiro et al. "A Methodology for Efficient Estimation of Switching Activist, in Sequential Logic Circuits," ACM/IEEE, 1994, pp. 12-17.
Ercolani et al. "Estimate of Signal Probability in Combinational Logic Networks," IEEE, pp. 132-138. Apr. 1989.
Mitsuhashi Takashi
Uchino Taku
Kabushiki Kaisha Toshiba
Siek Vuthe
Trans Vincent N.
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