Minimum crosstalk switchbox routing

As technology advances, interconnection wires are placed in closer proximity. Consequently, reduction of crosstalks between interconnection wires becomes an important consideration in VLSI design. In this paper, we study the gridded switchbox routing problems with the objectives of satisfying crosstalk constraints and minimizing the total crosstalk in the nets. We propose a new approach to the problems which utilizes existing switchbox routing algorithms and improves upon the routing results by re-assigning the horizontal and vertical wire segments to rows and columns, respectively, in an interative fashion. This approach can also be applied to the channel routing problem with crosstalk constraints. A novel mixed ILP formulation and effective procedures for reducing the number of variables and constraints in the mixed ILP formulation are then presented. The experimental results are encouraging.