Generating delay values for different contexts of a circuit

摘要

Approaches for generating delay values for instances of a circuit include inputting possible contexts of the circuit. Each context includes a respective delay value and a combination of possible types of a plurality of characteristics of the circuit, and each characteristic is of one type of a plurality of alternative types of the characteristic. A plurality of classification parameters is input and the classification parameters indicate selected ones of the characteristics. Groups of contexts are selected based on the plurality of classification parameters. Each group includes one or more of the contexts, and each context includes the plurality of characteristics. A combination of types of the selected characteristics in each context in a group is equal to the combination of types of the selected characteristics of each other context in the group. For each group, a mean and a standard deviation of the respective delay values are determined and output.

主权项

1. A method of generating delay values for instances of a circuit, comprising:
on a programmed processor, performing operations including:
inputting a plurality of contexts, wherein each context includes a respective delay value and a combination of possible types of a plurality of characteristics of the circuit, and each characteristic is of one type of a plurality of alternative types of the characteristic;inputting a plurality of classification parameters, the classification parameters indicating selected ones of the characteristics, and each of the plurality of characteristics not indicated by a classification parameter being a non-selected characteristic;selecting groups of contexts based on the plurality of classification parameters, wherein:
each group includes one or more of the contexts, and each context includes the plurality of characteristics; anda combination of types of the selected characteristics in each context in a group is equal to the combination of types of the selected characteristics of each other context in the group;determining for each group and from the contexts in each group, a mean and a standard deviation of the respective delay values; andoutputting the mean and standard deviation of each group.