Method and apparatus for assigning nets to metal layers during circuit routing
US6738959B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2002 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Aug 2, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F30/394
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a system that facilitates routing nets between cells in a circuit layout. During operation, the system receives a circuit design to be routed, wherein the circuit design includes multiple circuit blocks that have been placed at specific locations within the circuit layout. Next, the system determines estimated lengths for nets that couple these circuit blocks together. The system then calculates the delay for the nets that couple the circuit blocks using a class one rule. If the delay in a given net is greater than a specified delay, the system inserts a virtual repeater into the given net to decrease the delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.