2D to 3D Test Pattern Retargeting Using IEEE P1687 Based 3D DFT Architectures

Design For Test (DFT) of 3D stacked integrated circuits based on Through Silicon Vias (TSVs) is one of the hot topics in the field of test of integrated circuits. This is due to the hard test accessibility (especially for upper dies) and to the high complexity where each die can embed hundreds of IPs. In this paper we propose a DFT architecture based on IEEE P1687 to enable the test of 3D stacked ICs. The proposed test architecture allows the test at all 3D fabrication levels: pre-, mid-, and postbond levels. We present a test pattern retargeting flow using IEEE P1687 languages ICL (Instrument Connectivity Language) and PDL (Procedural Description Language), which allows easy retargeting from 2D (die-level) to 3D (stack-level). Compared to IEEE 1149.1 based 3D test architecture, our proposed 3D test architecture is more flexible and enhances test concurrency without an additional area cost.