Plowing: modifying cells and routing 45:9D - layouts

Authors:
K. M. Just;W. L. Schiele;T. Krüger
Affiliations:
Siemens AG, Semiconductor Division, HL CAD 22, Balanstr. 73, D-8000 Munich 80, FRG;Siemens AG, Semiconductor Division, HL CAD 22, Balanstr. 73, D-8000 Munich 80, FRG;Siemens AG, Semiconductor Division, HL CAD 22, Balanstr. 73, D-8000 Munich 80, FRG
Venue:
DAC '89 Proceedings of the 26th ACM/IEEE Design Automation Conference
Year:
1989

Citing 5
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A gridless router for industrial design rules

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Abstract

This paper describes a plowing procedure which moves and modifies cells and routing. The plow pushes aside all obstacles one by one, thus penetrating into the layout. The process leads to a compaction at the front side of the plow. The compaction is performed in accordance with the minimum spacing rules and with automatic jog insertion. Objects of the layout representation are cells, contacts, and wires. A wire is represented by a path of segments which lie in one of two layers, at angles of multiples of 45°. The generated blank space is used for adding new objects or resizing geometries.