| 摘要 |
A method of designing the layout of an integrated circuit (IC) by deriving an analytical constraint for a cut-based placement partitioner using analytical optimization, and placing cells on the IC with the cut-based placement partitioner using the analytical constraint. Quadratic optimization may be used to determine a desired ratio of a cell area of a given partition to a total cell area (the balance parameter), and placing may be performed using multilevel bisection partitioning constrained by the balance parameter. This implementation may include a determination of an aspect ratio for an entire partitioning region of the integrated circuit, and a "center-of-mass" coordinate of the cells based on the quadratic optimization, which are then used to define a placement rectangle having the same aspect ratio, and centered on the center-of-mass coordinate. This placement rectangle is used to derive the balance parameter. The placement rectangle has a total area equal to a total moveable cell area, and the balance parameter is computed by calculating the ratio of a left portion of the placement rectangle which lies in the left partition to the total area of the placement rectangle. The multilevel partitioner then places a proportionate number of the cells in the left partition based on the balance parameter.
|
