Seventh International Workshop Program
ARAMIS A.S.B.L. - UCL-DICE
Université Catholique de Louvain
September 8-10, 1997
5.2 " Sensitivity of the Worst Case Dynamic Power Estimation on Delay and Filtering Models ",S. Manich and J. Figueras, Universitat Politecnica de Catalunya, Spain.
The Weighted Switching Activity (WSA)
is a metric that models, at a logic level, the energy consumed by a circuit.
In this paper, the sensitivity to the delay and filtering models of the
maximum WSA is analyzed. A set of circuits is considered for the study
including the ISCAS-85 benchmark circuits. Three delay and filtering models
are considered: zero, unit and variable delays. According to the results,
an average increase in the maximum WSA of 221.3% is observed when the model
is changed from the zero to the unit model. Otherwise, an average reduction
of 38.0% is obtained when the model is changed from the unit to the variable
delay model. In order to compare the WSA estimated using the three delay
models with real measurements, the energy consumption per transition has
been measured in a 8x8 multiplier for a set of 396 random input pairs.
A least square adjustment has been done between the WSA estimations and
the measures. The best fit has been obtained for the variable delay model.
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