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| Content Provider | IEEE Xplore Digital Library | 
|---|---|
| Author | Xiaoping Tang Xin Yuan Gray, M.S. | 
| Copyright Year | 2007 | 
| Description | Author affiliation: IBM T.J. Watson Res., Yorktown Heights (Xiaoping Tang) | 
| Abstract | Layout optimization is a powerful technique for design migration, circuit performance tuning and design for manufacturing. In this paper, we study the problem of layout optimization for the hierarchical circuits in modern VLSI designs which essentially can be formulated as the integer linear programming (ILP) problem. Existing approaches are either unable to handle hierarchy, inefficient or failing to provide the feasible integer solutions for large scale hierarchical layouts. We present a practical method, IRLS algorithm (iteratively rounding and LP solving) which consists of a proper rounding strategy based on the careful analysis of hierarchical layout constraints, to obtain a feasible integer solution in the constraint-based layout modification process, thus enabling efficient optimization for large scale hierarchical layouts, and specifically avoiding the need to use the general ILP solvers. Experimental results demonstrate the efficiency and effectiveness of the IRLS algorithm. Compared with the general ILP/MILP solver, the IRLS algorithm can obtain decent results with much less runtime (speed-up ranging from 4.000X to 360.000X). Compared with the two-step approach(Allen et al., 2003) on legalizing a set of large scale industry circuit layouts, the IRLS algorithm can provide much better solution (satisfying all abutment/alignment constraints that the two-step approach fails to meet). | 
| Starting Page | 99 | 
| Ending Page | 104 | 
| File Size | 365703 | 
| Page Count | 6 | 
| File Format | |
| ISBN | 9781424413812 | 
| ISSN | 10923152 | 
| DOI | 10.1109/ICCAD.2007.4397250 | 
| Language | English | 
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) | 
| Publisher Date | 2007-11-04 | 
| Publisher Place | USA | 
| Access Restriction | Subscribed | 
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) | 
| Subject Keyword | Optimization methods Large-scale systems Design optimization Circuit optimization Manufacturing Very large scale integration Integer linear programming Iterative algorithms Algorithm design and analysis Constraint optimization | 
| Content Type | Text | 
| Resource Type | Article | 
| Subject | Computer Graphics and Computer-Aided Design Computer Science Applications Software | 
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