1. A method of defining a cell to a routing tool, comprising: providing a cell abstract comprising design parameters describing the cell to a placement and wiring tool, the design parameters including nets; determining at least two potential pin placements along each of at least some of the nets; generating an attribute for a pair of potential pin placements on the same net, the attribute representing a strength of connection between the pair; and storing the attribute for the pair in a database as associated with the cell.