Abstract
A special kind of wire connection is used for the System-in-Package (SIP). There is a close relation between the wire connection and leadframe. The locations of pads of nets are fixed, and the changes of the die rotation and layer location affect the connection of wires. Without connecting directly, leadframe is used to connect wires. We propose an algorithm to minimize the routing layers on leadframe. A fast heuristic algorithm was developed to find the approximate solution. Experimental results on a set of benchmark are reported to demonstrate the effectiveness of the proposed method. Also, we propose a heuristic method to shorten the computation time.