Test access mechaism for stack test time reduction of 3-dimensional integrated circuit

In this paper, the reconfigurable test access mechanism (RTAM) is designed based on the emerging test standard to reduce the cumulative stack test time of the 3-dimensional integrated circuit (3-D IC). The RTAM enables the test scheduling to reflect the variation of the test constraints in the overall stack test phases. Simulation results show the RTAM achieves the cumulative stack test time reduction compared with a non-reconfigurable TAM for the stacked dies in the 3-D IC.