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Crosstalk Noise analysis uses timing windows information for aggressor selection. Since switching activity changes across different operating modes of the chip, timing windows are also mode-specific. Large SOC designs often have multiple modes of operation, and to perform noise analysis at each mode will involve very high run times. In this paper, we propose an efficient method to perform noise analysis at multiple modes. The design is analyzed without using timing windows to identify a superset of noise nets. At each mode, coupling and propagated glitches are re-evaluated using mode specific timing windows and constraints. The method yields realistic results with low analysis time.