Iterative, noise-sensitive method of routing semiconductor nets using a delay noise threshold

A method of providing guidance for routing nets in an integrated circuit model, the method comprising:

• performing a first approximate routing of any nets of the integrated circuit model which have not been detail routed;
• selecting a first net as a selected net;
• selecting a set of neighbor nets within a close proximity to the selected net;
• selecting a set of worst aggressor nets which subject the selected net to a greater amount of noise than other sets of aggressor nets, the set of worst aggressor nets and the other sets of aggressor nets being subsets of the set of neighbor nets;
• determining a delay noise effect on the selected net due to the set of worst aggressor nets;
• classifying the selected net as a victim net of a set of victim nets if the total delay noise effect is greater than a delay noise threshold;
• detail routing the victim nets if the set of victim nets is not empty;
• after detail routing the victim nets, performing a second approximate routing of any nets that have not been detail routed, with already detail routed nets acting as blockages;
• selecting a set of least noise aggressive neighbor nets for each victim net if the set of victim nets is not empty;
• and
• providing constraints for detail routing each one of the set of least noise aggressive neighbor nets after selecting the set of least noise aggressive neighbor nets.