Method and apparatus for generating layout regions with local preferred directions
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United States of America Patent
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Aug 30, 2011
Grant Date -
Jul 15, 2010
app pub date -
Mar 24, 2010
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 embodiments, 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 items 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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