International Business Machines Corporation

Lucy Lim

Philip S Honsinger

Vinod Narayanan

A wiring methodology for optimizing the wiring of multiple wiring media packages. Data models are created for the package and for the networks which embody the circuit design logic of the package. These data models represent the design data and the contrasting electrical and geometrical characteristics of the different media in a form suitable for the operation of wiring algorithms. In the preferred embodiment, one or more constraint models are associated with each wiring network. The electrical properties and availability limits of all wiring resources are included in the data model. The data model is then used in the selection of a rough path for each connection and the assignment of networks and portions of networks to particular media. The rough path serves as a basis for estimates of the characteristics of the wiring solution for each network. Network assignments and estimates are made globally, considering the information for other networks and package design constraints incorporated into the data model. After assignment of media, networks are partitioned into subconnections. Interface via selection is optimized through a process whereby each possible combination between network pins needing vias and available vias is evaluated with respect to a set of costs. Estimates made in prior steps are used to generate these costs. Following via selection, detail routing can then be implemented by segmenting the wiring problem into separate problems for each medium. These separate problems can be resolved sequentially in no particular order.

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Wappingers Falls, NY, United States of America

Lucy Lim