LP method and apparatus for identifying route propagations
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United States of America Patent
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Apr 19, 2005
Grant Date -
Mar 6, 2003
app pub date -
Jan 5, 2002
filing date -
Jan 19, 2001
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Abstract
Some embodiments provide an LP method that identifies route propagations. In some embodiments, this method is used by a router that hierarchically defines routes for nets within a region of a design layout. The router (1) partitions the region into a first set of sub-regions, and (2) for each particular net, identifies a route that traverses a set of the first-set sub-regions. In some embodiments, the invention's method partitions the first set of sub-regions into a second set of smaller sub-regions. It then identifies a plurality of propagation possibilities for propagating each route into the second set of smaller sub-regions of the first set sub-regions. The method next formulates a linear-programming ('LP') problem based on the identified propagation possibilities. The method then solves the LP problem. In some embodiments, the formulated LP problem is an integer-linear-programming ('ILP') problem, and solving the ILP problem returns integer solutions that specify one propagation permutation for each route in each first-set sub-region traversed by the route. In other embodiments, solving the LP problem returns real-numbered solutions. In some of these embodiments, the method converts the real-number solutions into integer solutions that specify one identified propagation permutation for each route in each first-set sub-region traversed by the route.
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- 15 United States
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Patent Owner(s)
- CADENCE DESIGN SYSTEMS, INC.
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Buset, Oscar | Morges, CH | 12 | 187 |
Teig, Steven | Menlo Park, CA | 332 | 6457 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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