IBM Journal of Research and Development
IBM Skip to main content
  Home     Products & services     Support & downloads     My account  

  Select a country  
Journals Home  
  Systems Journal  
Journal of Research
and Development
    Current Issue  
    Recent Issues  
    Papers in Progress  
    Search/Index  
    Orders  
    Description  
    Patents  
    Recent publications  
    Author's Guide  
  Staff  
  Contact Us  
  Related links:  
     IBM Research  

IBM Journal of Research and Development  
Volume 28, Number 5, Page 581 (1984)
Design Automation
  Full article: arrowPDF   arrowCopyright info





   

Constraint solver for generalized IC layout

by P. W. Cook
This paper presents a constraint solver suitable for use in a general symbolic IC layout system. The essential features of the constraint solver, which is intended to place few restrictions on the source of the constraints to be solved, are that it accommodate mixed equality and inequality constraints, that it allow selective "maximization" of variables, that it proceed with any number of variables given user-defined values, and that it fail to produce a solution only when no solution exists. These features all flow from the desire to provide a constraint solver suitable for use in an "open" system, in which there are no restrictions on the form or order of the constraints. The algorithm presented meets these objectives while remaining reasonable in its use of storage and time. An extension to the class of constraints acceptable by the constraint solver is presented; the extension of the system to this added constraint class has yet to be done.
Related Subjects: Design automation; Integrated circuits