Multi-function LSI wafers (US Patent 3984860)

Patent number: 3984860 Granted: 1976-10-05 Filed: 1974-12-13 Inventors: Joseph C. Logue (Poughkeepsie, NY, US) Assignees: International Business Machines Corporation (Armonk, NY, US)

Abstract

A system that is to be placed on a wafer is partitioned into reasonably large functions, each provided with a set of I/O and power pads. The wafer design is called "design A"0 A second wafer design (design B) that is the mirror image of design A is also constructed. Wafers of designs A and B are tested and divided into two groups: group I wafers have