Fault location in cellular arrays

Testing of complex integrated cellular logic circuits fabricated using LSI techniques has become a source of concern to users and manufacturers. Since an economically feasible solution to testing problems is not visible for the complex arrays contemplated for the near future, manufacturers have acknowledged the seriousness of the problem. Currently some observers believe that LSI cannot be tested because general procedures for testing and diagnosing digital circuits are applicable to small networks of approximately 30 gates, while cellular arrays are contemplated as containing hundreds or thousands of gates on one chip. However, if arrays are constrained to be in a cellular form, then testing problems can be simplified and test schedules can be produced which use the interconnection structure of cellular arrays.