Cross point assignment algorithm with crosstalk constraint

In this paper, an approach to resolve the coupling effect problem is proposed during the Cross Point Assignment (CPA) stage. We combine the priority queue concept with rip-up and reroute strategy to control crosstalk noise caused by interconnect coupling capacitance. First we arrange the nets into different priority queues according to their weighted sum of their length and criticality. Then the CPA problem for one queue of nets is translated into a linear assignment problem. After the assignment of one queue of nets, we perform a post-CPA checking routine to check and rip up the net pairs which violate the crosstalk noise constraint and then push them into the next queue to be reassigned. We have tested our algorithm by a set of bench mark examples and the experimental results are promising.