I am not sure about what
means peak and average IR drop mode analysis in Encounter. What of
these two analysis modes should be considered for power plan
I have a small block
design (5K gates) operating at very low frequency (640 KHz) and there
is a big difference between the results of these two analysis modes:
worst IR drop average
analysis: 9.8035e-05 v
worst IR drop peak
analysis: 4.3088e-01 v
Is average analysis
frequency dependent? But voltage drop is not event dependent and so
can cause timing problems also at low frequencies?
Thanks in advance.
Hello EngHan,I found only these definitions about peak and average IR drop analysis in Encounter documentation:AVERAGE: Displays a gradient of the average IR drop during the entire analysis period. Use this type of analysis to identify potential areas of power deficiency within the design.PEAK: Displays a gradient that shows the largest IR drop during the analysis period. Use this type of analysis to identify IR drop that is caused by local switching activity.But these definitions don't clarify my doubts...If average IR drop is calculated over an entire clock period, this analysis mode should mislead delay problems due voltage drop at low frequencies?I think that if switching activity, and so voltage drop, will occur only at the time around clock event , so it is better consider peak than average IR drop analysis... Is it right?Regards,Cristiano.