PATMOS'97  Seventh International Workshop Program  ARAMIS A.S.B.L. - UCL-DICE  Université Catholique de Louvain  Louvain-la-Neuve, Belgium 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.
manich@eel.upc.es