Method of routing three layer metal gate arrays using a channel

Details Method of routing three layer metal gate arrays using a channel Method of routing three layer metal gate arrays using a channel

1992-02-19

1995-03-21

Chaudhuri, Olik

Fishing, trapping, and vermin destroying

437195, 257211, 257909, H01L 2170

Patent

active

053995171

ABSTRACT:
In a method for providing routing between logic cells, the logic cells are arranged in rows. Intercell connectors within each row of logic cells are aligned, for example in the middle of the rows, to form channel boundaries. The intercell connectors are then channel routed in metal layers above the logic cells. Alternately, intercell connectors are placed within the logic cells, however, these intercell connectors are not necessarily aligned. For each intercell connector which is not on a boundary of a routing channel, a substitute connector is located at the boundary of a routing channel. The substitute connectors and the intercell connectors which are on the boundaries of the routing channels are channel routed. Length of routing segments are then adjusted to substitute connectors to extend to intercell connectors instead of the substitute connectors.

REFERENCES:
patent: 4745084 (1988-05-01), Rowson et al.
patent: 5084404 (1992-01-01), Sharpe-Geisler
patent: 5227324 (1993-07-01), Fujimoto et al.
patent: 5275962 (1994-01-01), Hashimoto
Sabih H. Gerez and Otto E. Herrmann, "Cracker: A General Area Router Based on Stepwise Reshaping", IEEE, 1989, pp. 44-47.
Charles H. Ng, "An Industrial World Channel router for Non-rectangular Channels", 23rd Design Automation Conference, IEEE 1986, pp. 490-494.
Wei-Ming Dai, Tetsuo Asano and Ernest S. Kuh, "Routing Region Definition and Ordering Scheme for Building-Block Layout", IEEE Transactions on Computer-Aided Design, Jul. 1985, pp. 189-197.
G. Meixner and U. Lauther, "A New Global Router Based on a Flow Model and Linear Assignment", IEEE, 1990, pp. 44-47.

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