Structural Fault Testing of Embedded Cores Using Pipelining

  • Authors:
  • M. Nourani;C. A. Papachristou

  • Affiliations:
  • Department of Electrical Engineering, The University of Texas at Dallas, Richardson, Texas 75083. nourani@utdallas.edu;Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, Ohio 44106, USA. cap@eecs.cwru.edu

  • Venue:
  • Journal of Electronic Testing: Theory and Applications
  • Year:
  • 1999

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Abstract

The purpose of this paper is to develop a global design fortest methodology for testing a core-based system in its entirety. This is achieved by introducing a “bypass” mode for each core bywhich the data can be transferred from a core input port to theoutput port without interfering the core circuitry itself. Theinterconnections are thoroughly tested because they are used topropagate test data (patterns or signatures) in the system. Thesystem is modeled as a directed weighted graph in which theaccessibility (of the core input and output ports) is solved as ashortest path problem. Finally, a pipelined test schedule is made tooverlap accessing input ports (to send test patterns) and outputports (to observe the signatures). The experimental results showhigher fault coverage and shorter test time.