Patent ID: 7260805
Filing Date: 2007-08-21
Classification: G06F

Abstract:
1. A computer implemented method of performing a powergrid analysis of an integrated circuit design when some connection sites are unknown comprising: selecting a local metal layer of a first cell lower than a topmost local metal layer of the first cell, the selected local metal having known sites of electrical contact with a higher local metal layer of the first cell; selecting a topmost local metal layer of a second cell, the topmost layer of the second cell having known sites of electrical contact with a global metal layer; designating the known sites of electrical contact on the selected local metal layer of the first cell and the known sites of electrical contact on the topmost metal layer of the second cell as ports at which to model the first cell and the second cell, respectively, thereby substantially excluding designating unknown sites of electrical contact as ports; performing a powergrid analysis; and providing the powergrid analysis of the integrated circuit design.