International Business Machines Corporation

Shuhui Lin

Philip S Honsinger

Andrew D Huber

Vinod Narayanan

Lok T Lui

Ling-Hui Hao

Hai H Chen

Thomas J Lavery

A routing method for differential current switch (DCS) pairs initially shortens the min/max length window for a first routed rail in order to increase the likelihood that length of the second rail will fall within the window. Next, the routing domain for the first rail is modified so that the first pin exit direction to the route is toward the second pin of the differential current switch pair. A suitable algorithm, such as a prior art mazerouter algorithm, is used to route the first rail along a path restricted to the routing domain. At each proposed via connection for connecting the first rail route from one plane to another, the program accepts the proposed via connection only if there is an available adjacent via for routing the second via. If a via for routing the second rail is not available, the proposed route for the first rail is rejected.

Automatic DCS routing for multilayer packages to minimize coupled noise

A method of assigning pins to corresponding connection points in the design of computer modules where connection points on one layer need to be electrically connected through the pins to a wiring layer so as to minimize the length of the wiring between the points. A best area for selecting a pin is identified for each point that needs to use a pin, and pins are preferentially assigned to the points from their respective best areas. The method introduces a consideration of the direction of the destination point into the assignment solution and allows previous assignment methods to be used which incorrectly assumed that the direction to the destination point could be ignored.

Method for assigning pins to connection points

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Poughkeepsie, NY, United States of America

Shuhui Lin