Routing method in computer-aided-customization of universal arra

Details Routing method in computer-aided-customization of universal arra Routing method in computer-aided-customization of universal arra

1984-05-10

1987-01-13

Lall, Parshotam S.

Boots, shoes, and leggings

364489, 357 45, G06F 1520

Patent

active

046369651

ABSTRACT:
A routing process for automatic computer aided routing of customizing conductors in a universal array which has a single customizing conductive layer is improved by executing a pathfinding routing process for conductors which connect pins on the same row before routing other conductor types. Routing of conductors which connect a pin on the side surface to a pin in the basic unit row region is improved by initially restricting permissible routes to be within a set of three contiguous rectangles. Routing opportunities for potentially failed conductors are increased by allowing customizing conductors to extend parallel to the length of the basic unit rows in the region between adjacent tunnel ranks in the final routing step. An improved custom IC results.
The conductor number of the shortest and the longest conductor in each class is stored separately from the routing grid matrix so that these numbers can be directly retrieved as needed.
Since the conductors are arranged in class and length order in the wiring matrix, the routing process in going through any class of conductors in an attempt to route them retrieves them in a length order (long-to-short or short-to-long).

REFERENCES:
patent: 3567914 (1971-03-01), Neese et al.
patent: 3653072 (1972-03-01), Ballas et al.
patent: 3702004 (1972-10-01), Eskew et al.
patent: 4500963 (1985-02-01), Smith et al.

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