NDLI: Global routing considerations in a cell synthesis system

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Global routing considerations in a cell synthesis system

Content Provider	ACM Digital Library
Author	Shugard, Don Hill, Dwight
Abstract	Cell synthesis is the process of turning a netlist into an efficient layout without being restricted to a library of predesigned cells or a fixed floorplan. Normally, this job is broken into at least three parts: placement, routing, and detailed cell generation. Each of these tasks are often divided further into a global and a detailed phase. This paper presents cell synthesis system called Sea Of Devices (SOD), with emphasis on its routing phase. In particular, SOD uses a new model for the global routing problem. This model is based on traditional Steiner trees, but includes detailed geometric information specific to the cell synthesis problem. The system models diffusion strips, congestion and existing feedthru's as a cost function associated with regions on the routing plane. A sequence of algorithms based on spanning trees, Steiner trees, maze routing and channel routing techniques is used to find solutions that make use of this detailed knowledge. The presentation includes some discussion of the algorithms that tie the routing phases together and illustrates the underlying support structures, which are needed for efficient access. Examples from the Physical Design Workshop 89 [PDW89] are included.
Starting Page	312
Ending Page	316
Page Count	5
File Format	PDF
ISBN	0897913639
DOI	10.1145/123186.123285
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1991-01-03
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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