A collision-free extension to the mutual inter-unit test methodology for d-dimensional VLSI multiprocessors is
proposed to guarantee that any processor core is tested only by its neighboring node at a time and no special care
needs to be taken to choose those moments when test actions should start. Collision resolution hardware based on
the round-robin arbitration routine is discussed in detail. A parallel collision-resolution-aware mutual inter-unit
test algorithm is formulated and diagrammed. The proposed approach has been shown to improve the testability
of mesh-connected multiprocessors by increasing the probability of successful fault detection as compared with
the distributed self-checking methodology. Further, the new approach drastically reduces extra connectivity in the
multiprocessor with respect to known mutual inter-unit test methods and leads to more easily manufactured
multiprocessor fabric. For example, in a 4-dimensional system, we need 55% less extra connections with our
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