Interposer defect coverage metric and method to maximize the same

摘要

A method includes receiving a design of an interposer having nets, probe pads, and micro-bumps. The nets connect the micro-bumps. The probe pads are initially unconnected to the nets. The method further includes initializing a first set to logically include the nets; processing the first set such that every net interconnecting more than two micro-bumps is divided into a plurality of nets and every two micro-bumps are interconnected by one net; calculating an untested length for each net in the first set; selecting a net N from the first set wherein the net N has the maximum untested length in the first set, the net N representing at least a portion of a net P of the nets; selecting a pair of probe pads that are unconnected to the nets; and connecting the pair of probe pads to the net P by two dummy nets.