IEEE Std 1838™-2019 standardizes mandatory and optional on-chip hardware components for 3D test access. It is intended that in the future a standard is developed for a formal, computer-readable language in which implementation choices for the three-dimensional design-for-test (3D-DfT) hardware can be specifed and described. An idea of a language/data structure has been described in [B5]. 1
The aim of IEEE Std 1838 is to defne at die-level standardized and scalable 3D-DfT features based on and working with digital scan-based test access, such that when compliant dies are stacked, a stack-level 3D-DfT test access architecture emerges with a minimum functionality and many optional extensions. IEEE Std 1838 provides a modular test access architecture, in which dies and interconnect layers between adjacent stacked dies can be tested individually. The focus of the standard is testing the intra-die circuitry as well as the inter-die interconnects in pre-bond, mid-bond, and post-bond cases in pre-packaging, post-packaging, and board-level situations. The standard provides test access via a mandatory one-bit (‘serial’) input/output test port and optional multi-bit (‘parallel’) test ports.
