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Power estimation after synthesis and Place-&-route

Dear all,

In my design, total power consumption estimated after synthesis by Cadence-BuildGates is:
Internal Cell + Leakage + Net =
0.2904 + 3.9775 + 0.3833 = 4.6512 mW

While, after place-and-route, Cadence-Encounter reports:
Total leakage power = 337395.002511uW

Can anyone tell me why there may be such a diffence? what might be wrong?

Thanks,
Ali

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