Method and apparatus for realistic current and power calculation

Details Method and apparatus for realistic current and power calculation Method and apparatus for realistic current and power calculation

1993-12-22

1996-07-09

Teska, Kevin J.

Boots, shoes, and leggings

364490, G06F 9455

Patent

active

055353703

ABSTRACT:
An innovative method and system for calculating realistic current and power of a circuit prior to silicon utilizes simulation and test vectors to determine a number of variables to accurately perform current calculations close to actual silicon results. Input test vectors which preferably are similar in function to applications utilized with the circuit are used to drive a model of the circuit. The simulator operating the model maintains the toggle count for each device of the circuit. A characterization table is generated which contains an average switching current value of a type of a device for different values of capacitive loads. Typically, this table is generated once and is used for a multiplicity of calculations. An activity factor can then be generated based on the number of the toggle count during a sample time period and the number of clock cycles during the sample period. Using the activity factor, the current is determined from the average switching current for the device times the activity factor. The current can then be used to perform such calculations as power consumption and electromigration testing.

REFERENCES:
patent: 4827427 (1989-05-01), Hyduke
patent: 5278770 (1994-01-01), Gore et al.
patent: 5313398 (1994-05-01), Rohrer et al.
patent: 5349542 (1994-09-01), Brasen et al.
patent: 5351197 (1994-09-01), Upton et al.
patent: 5379231 (1995-01-01), Pillage et al.

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