Method and apparatus for costing a path expansion
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United States of America Patent
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Sep 20, 2005
Issued Date -
N/A
app pub date -
Oct 31, 2002
filing date -
Jun 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Some embodiments of the invention provide a method of propagating a first cost function that is defined over a first state to a second slate in a space representing a design-layout region. In some embodiments, the space includes a set of states and a transition map that specifies a set of states that can be reached from each particular state. The space has several dimensional states. The method identifies several pairs of wedge vectors. Each vector has a tail, and each wedge-vector pair includes two vectors that are connected at their tails. The method assigns locations in the first state for the tails of at least some of the identified wedge-vector pairs. The method then uses the wedge-vector pairs that have assigned tail locations to propagate the first cost function.
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