Incremental placement of design objects in integrated...

Computer-aided design and analysis of circuits and semiconductor – Nanotechnology related integrated circuit design

Reexamination Certificate

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Reexamination Certificate

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06871336

ABSTRACT:
An incremental placement method uses a set of connections to optimize and a set of movable design objects. The movable design objects are unplaced. A plurality of anchoring connections is associated with the movable design objects. A set of weights is associated with the set of connections to optimize and the plurality of anchoring connections. An objective function is constructed using the set of connections to optimize, the plurality of anchoring connections, and the set of weights. The objective function is minimized to obtain a placement of the movable design objects.

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C. Changfan, Yu-Chin Hsu, Fur-Shing Tsai; “Timing Optimization on Routed Designs with Incremental Placement and Routing Characterization”; IEEE Transactions on computer-Aided Design of Integrated Circuits and Systems; vol. 19, No. 2; Feb. 2000; pp. 188-196.
Amir H. Ajami, Massoud Pedram; “Post-Layout Timing-Driven Cell Placement Using an Accurate Net Length Model with Movable Steiner Points”; ASIA South Pacific DAC; Copyright 2001; pp. 595-600.
Konrad Doll, Frank M. Johannes, Kurt J. Antreich; “Iterative Placement Improvement by Network Flow Methods”; IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems; vol. 13, No. 10; Oct. 1994; pp. 1189-1200.

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