Method and apparatus for generating layout regions with local preferred directions
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United States of America Patent
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Apr 27, 2010
Grant Date -
Dec 8, 2005
app pub date -
Dec 6, 2004
filing date -
Jun 4, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Some embodiments of the invention provide a method for defining wiring directions in a design layout having several wiring layers. The method decomposes a first wiring layer into several non-overlapping regions. It assigns at least two different local preferred wiring directions to at least two of the regions. In some embodiment, the method decomposing the first wiring layer by using the vertices of items in the layout to decompose the layout. In some of these embodiments, the item include macro blocks. The method of some embodiments also identifies several power via arrays on the first wiring layer, and identifies a local preferred wiring direction based on the arrangement of the power via arrays on the first wiring layer.
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