analoglowpowlec6

Analoglowpowlec6

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Unformatted text preview: 0 12 Information Theoretic Information Approaches Approaches • Estimate power at Register Transfer Level – Estimate entropy and use it to find signal activity • Entropy H (x) defined in terms of signal probability p: Entropy (x) • For discrete-valued signal x, with n values: For with December 9, 2013 Analog and Low-Power Design Lecture 6 (c) 200 13 Activity Tracks Entropy • Tracks entropy if temporal correlation can be ignored – Theory not yet adequately developed December 9, 2013 Analog and Low-Power Design Lecture 6 (c) 200 14 Maximum Power Estimation • Can be important for desktop applications: – Design of power and ground lines – Determining line voltage drop – Determining packaging requirements Estimating – Estimating maximum current to determine inductive bounce in power supplies bounce December 9, 2013 Analog and Low-Power Design Lecture 6 (c) 200 15 Automatic Test Pattern Generation Automatic (ATPG)-Based Method (ATPG)-Based • Dynamic current due to 2 consecutive binary vectors: – T (g) is binary variable showing whether gate g switches • Method: Sort – Sort all gates by output C in non-increasing order Assign – Assign transitions to gates from list with largest output C or with the largest fanout the Used – Used 9-valued D algorithm to justify transitions with ATPG (automatic test-pattern generation) program (automatic • Results: more efficient and accurate than simulation-based Results: techniques for maximum power estimation techniques December 9, 2013 Analog and Low-Power Design Lecture 6 (c) 200 16 Steepest Descent Method • Approximate power as: • • • F (g) = # gate fanouts T (g) = transition count at...
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This document was uploaded on 12/08/2013.

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