Wrapper design for embedded core test
Marinissen, E.J.; Goel, S.K.; Lousberg, M.
Test Conference, 2000. Proceedings. International
Volume , Issue , 2000 Page(s):911 - 920
Digital Object Identifier 10.1109/TEST.2000.894302
Summary:A wrapper is a thin shell around the core, that provides the
switching between functional, and core-internal and core-external test
modes. Together with a test access mechanism (TAM), the core test
wrapper forms the test access infrastructure to embedded reusable cores.
Various company-internal as well as industry-wide standardized but
scalable wrappers have been proposed. This paper deals with the design
of such core test wrappers. It gives a general architecture for
wrappers, and describes how a wrapper can be built up from a library of
wrapper cells which are selected on basis of the terminal types of the
core. We show that the ordering and partitioning of wrapper cells and
core-internal scan chains over TAM chains determine the test time of the
core. An heuristic approach for the NP-hard problem of partitioning the
TAM chain items for minimal test time is presented and its usage is
illustrated by means of an example. Finally we sketch how wrapper
generation and verification can be automated
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