Inventors:
Richard D. Blinne - Fort Collins CO
Richard J. Holzer - Fort Collins CO
Timothy R. Ouellette - Greeley CO
Rhea R. Ozman - Fort Collins CO
Richard A. Laubhan - Fort Collins CO
John Scott - Fort Collins CO
Assignee:
NCR Corporation - Dayton OH
International Classification:
G06F 1560
Abstract:
A method for approximating the delay time of an excitation through a logic cell using the summation of a base delay, which is a function of delay coefficients for the cell and the total output load capacitance of the cell, and a rise/fall time correction, which is determined from the output rise/fall time of the driving cell and the sensitivity of the analyzed cell to rise/fall time. Other corrections/compensating factors include a performance derating factor which accounts for the multiplicative effects of operating voltage, temperature and process.