A logic design structure for LSI testability
DAC '77 Proceedings of the 14th Design Automation Conference
Test generation for large logic networks
DAC '77 Proceedings of the 14th Design Automation Conference
A comparative analysis of event tupling schemes
FTCS '96 Proceedings of the The Twenty-Sixth Annual International Symposium on Fault-Tolerant Computing (FTCS '96)
Diagnostic Techniques for the IBM S/390 600 MHz G5 Microprocessor
ITC '99 Proceedings of the 1999 IEEE International Test Conference
The Role of a Maintenance Processor for a General-Purpose Computer System
IEEE Transactions on Computers
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The concepts of automated diagnostics that were developed for and that are implemented in the IBM 3081 Processor Complex are presented in this paper. Significant features of the 3081 diagnostics methodology are the capability to isolate intermittent as well as solid hardware failures, and the automatic isolation of a failure to the failing field-replaceable unit (FRU) in a high percentage of the cases. These features, which permit a considerable reduction in the time to repair a failure as compared to previous systems, are achieved by designing a machine which has a very high level of error-detection capability as well as special functions to facilitate fault isolation using Level-Sensitive Scan Design (USD), and which includes a Processor Controller to implement diagnostic microprograms. Intermittent failures are isolated by analyzing data captured at the detection of the error, and the analysis is concurrent with customer operations if the error is recoverable. A further improvement in the degree of isolation is achieved for solid failures by using automatically generated validation tests which detect and isolate stuck faults in the logic. The diagnostic package was designed to meet a specified value of isolation effectiveness, stated as the average number of FRUs replaced per failure. The technique used to estimate the isolation effectiveness of the diagnostic package and to evaluate proposals for improving isolation is described. Testing of the diagnostic package by hardware bugging indicates very good correlation between projected and measured effectiveness.