Integrated circuit physical design automation system utilizing optimization process decomposition and parallel processing
First Claim
1. A physical design automation system for producing an optimized cell placement for an integrated circuit chip, comprising:
- a decomposer for decomposing a placement optimization methodology into a plurality of cell placement optimization processes;
a plurality of parallel processors for performing said optimization processes simultaneously on input data representing said chip;
a recomposer for recomposing results of said optimization processes and producing an optimized cell placement corresponding thereto; and
a controller for analyzing a fitness of said optimized cell placement and controlling the parallel processors to selectively repeat performing said optimization processes for further optimizing said optimized cell placement if said fitness does not satisfy a predetermined criterion;
in which the controller identifies low fitness areas of said optimized placement and selectively assigns the processors to repeat performing said optimization processes on said low fitness areas respectively.
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Abstract
In a physical design automation system for producing an optimized cell placement for an integrated circuit chip, a placement optimization methodology is decomposed into a plurality of cell placement optimization processes that are performed simultaneously by parallel processors on input data representing the chip. The results of the optimization processes are recomposed to produce an optimized cell placement. The fitness of the optimized cell placement is analyzed, and the parallel processors are controlled to selectively repeat performing the optimization processes for further optimizing the optimized cell placement if the fitness does not satisfy a predetermined criterion. The system can be applied to initial placement, routing, placement improvement and other problems. The processors can perform the same optimization process on different placements, or on areas of a single placement. Alternatively, the processors can perform different optimization processes simultaneously on a single initial placement, with the resulting processed placement having the highest fitness being selected as the optimized placement. The processors can further selectively reprocess areas of a placement having high cell interconnect congestion or other low fitness parameters.
193 Citations
17 Claims
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1. A physical design automation system for producing an optimized cell placement for an integrated circuit chip, comprising:
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a decomposer for decomposing a placement optimization methodology into a plurality of cell placement optimization processes; a plurality of parallel processors for performing said optimization processes simultaneously on input data representing said chip; a recomposer for recomposing results of said optimization processes and producing an optimized cell placement corresponding thereto; and a controller for analyzing a fitness of said optimized cell placement and controlling the parallel processors to selectively repeat performing said optimization processes for further optimizing said optimized cell placement if said fitness does not satisfy a predetermined criterion; in which the controller identifies low fitness areas of said optimized placement and selectively assigns the processors to repeat performing said optimization processes on said low fitness areas respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A physical design automation system for producing an optimized cell placement for an integrated circuit chip, comprising:
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a decomposer for decomposing a placement optimization methodology into a plurality of cell placement optimization processes; a plurality of parallel processors for performing said optimization processes simultaneously on input data representing said chip; a recomposer for recomposing results of said optimization processes and producing an optimized cell placement corresponding thereto; and a controller for analyzing a fitness of said optimized cell placement and controlling the parallel processors to selectively repeat performing said optimization processes for further optimizing said optimized cell placement if said fitness does not satisfy a predetermined criterion, in which; the process decomposer generates a plurality of initial placements; the parallel processors perform said cell optimization processes on said initial placements to produce a plurality of processed cell placements respectively; the process recomposer designates a processed cell placement having a highest fitness as said optimized cell placement; and said optimization processes comprise genetic crossover between said initial placements.
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13. A physical design automation system for producing an optimized cell placement for an integrated circuit chip, comprising:
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a decomposer for decomposing a placement optimization methodology into a plurality of cell placement optimization processes; a plurality of parallel processors for performing said optimization processes simultaneously on input data representing said chip; a recomposer for recomposing results of said optimization processes and producing an optimized cell placement corresponding thereto; and a controller for analyzing a fitness of said optimized cell placement and controlling the parallel processors to selectively repeat performing said optimization processes for further optimizing said optimized cell placement if said fitness does not satisfy a predetermined criterion, in which; said optimization processes comprise different algorithms respectively; the processor generates an initial placement; the parallel processors perform said cell optimization processes on said initial placement to produce a plurality of processed cell placements respectively; and the process recomposer designates a processed cell placement having highest fitness as said optimized cell placement.
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14. A physical design automation system for producing an optimized cell placement for an integrated circuit chip, comprising:
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a decomposer for decomposing a placement optimization methodology into a plurality of cell placement optimization processes; a plurality of parallel processors for performing said optimization processes simultaneously on input data representing said chip; a recomposer for recomposing results of said optimization processes and producing an optimized cell placement corresponding thereto; and a controller for analyzing a fitness of said optimized cell placement and controlling the parallel processors to selectively repeat performing said optimization processes for further optimizing said optimized cell placement if said fitness does not satisfy a predetermined criterion; in which the process decomposer generates an initial placement, divides cells of said initial placement into a plurality of nets of interconnected cells and assigns the processors to perform said optimization processes on said nets respectively. - View Dependent Claims (15)
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16. A physical design automation system for producing an optimized cell placement for an integrated circuit chip, comprising:
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a decomposer for decomposing a placement optimization methodology into a plurality of cell placement optimization processes; a plurality of parallel processors for performing said optimization processes simultaneously on input data representing said chip; a recomposer for recomposing results of said optimization processes and producing an optimized cell placement corresponding thereto; and a controller for analyzing a fitness of said optimized cell placement and controlling the parallel processors to selectively repeat performing said optimization processes for further optimizing said optimized cell placement if said fitness does not satisfy a predetermined criterion; in which the process decomposer generates an initial placement, divides cells of said initial placement into a plurality of groups of cells in accordance with a predetermined hierarchial organization and assigns the processors to perform said optimization processes on said groups respectively. - View Dependent Claims (17)
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Specification