Preconditioning for EDA cell library
First Claim
1. A cell library comprising:
- a first cell identifier, the first cell identifier corresponding to a first cell;
a first preconditioning function for generating a first input variable from a first operational parameter, the first preconditioning function being associated with the first cell identifier; and
a first mathematical model for generating an output value for a first performance parameter, the first mathematical model being a function of the first input variable, and the first mathematical model being associated with the first cell identifier.
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Abstract
A characterized cell library for EDA tools includes one or more mathematical models for each cell, and one or more preconditioning functions (and/or inverse preconditioning functions) for each mathematical model. Each mathematical model represents a performance parameter (e.g., delay, power consumption, noise) or a preconditioned performance parameter of the cell. The preconditioning functions convert an operating parameter (e.g., input slew, output capacitance) associated with the performance parameter into a preconditioned input variable for the mathematical models. In doing so, the preconditioning functions allow for more accurate modeling of complex data relationships without increasing the complexity (e.g., order and number of coefficients) of the mathematical models. Also, because the cell library can be substantially similar to conventional polynomial-based cell libraries except for the inclusion of preconditioning functions, preconditioning does not significantly increase storage requirements and conventional EDA tools can be readily adapted to use the preconditioned cell library.
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11 Claims
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1. A cell library comprising:
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a first cell identifier, the first cell identifier corresponding to a first cell; a first preconditioning function for generating a first input variable from a first operational parameter, the first preconditioning function being associated with the first cell identifier; and a first mathematical model for generating an output value for a first performance parameter, the first mathematical model being a function of the first input variable, and the first mathematical model being associated with the first cell identifier. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cell library comprising:
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a first cell identifier, the first cell identifier corresponding to a first cell; a first inverse preconditioning function for generating a first performance parameter from a first preconditioned performance parameter, the first inverse preconditioning function being associated with the first cell identifier; and a first mathematical model for generating an output value for the first preconditioned performance parameter, the first mathematical model being associated with the first cell identifier. - View Dependent Claims (9, 10, 11)
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Specification