By José T. de Sousa
Boundary-Scan Interconnect Diagnosis explains how you can synthesize electronic diagnostic sequences for twine interconnects utilizing boundary-scan, and the way to evaluate the standard of these sequences. Its value has to do with designing advanced digital platforms utilizing pre-designed highbrow estate (IP) cores, that is turning into more and more renowned these days. considering checks for pre-designed cores could be provided with the cores themselves, the one extra assessments that must be constructed to check and diagnose the full approach are these for twine interconnects among the cores.
in addition to the trivial options which are usually used to unravel this challenge, there are various extra equipment that allow major optimizations of try vector size and/or diagnostic solution. The e-book surveys all latest tools of this type and proposes new ones. within the new process circuit and interconnect faults are rigorously modeled, and graph thoughts are utilized to unravel the matter. the unique characteristic of the hot strategy is the truth that it may be adjusted to supply shorter try out sequences and/or better diagnostic answer. The effectiveness of present and proposed tools is then evaluated utilizing genuine digital assemblies and released statistical info for an exact production technique from HP.
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Sample text
1 Faults, defects and failures A fault is an alteration of the specified EA behavior, which violates its specification. A defect is a manufacture imperfection, which may or may not cause faults. Defects can be categorized in the following way (Wassink, 1989): Cosmetic: if the circuit behavior is not affected. Operative: if the circuit behavior is affected. An example of a cosmetic defect may be a solder excess, which does not cause any short circuit or significant spurious impedance. A failure is a structural degradation that occurs during normal operation and is always operative.
Let be one of those nets. It must be true that the driver of is disconnected from its receiver. 1, F would be detected. To justify the correct response two or more net drivers need be shorted to the receiver of Assuming that can be used, at least one more net is needed. If cannot be used then at least two more nets are needed. Let be one of those nets. As before, to avoid shorting the receivers of and the driver of must be disconnected from its receiver. Also, at least one more net is needed to justify This process continues ad infinitum: always requires the addition of yet another net to justify Note that can only be used once to justify some net and that the nets cannot be used because they are already shorted to a receiver.
Two situations are possible: either no SRV is erroneous, and therefore the short will go undetected, or only some SRVs are erroneous, and the fault will only be partially diagnosed. Another situation where diagnostic analysis is difficult is when a non-deterministic fault occurs. These are faults that behave differently in different applications of the same test. The problems mentioned in this paragraph do not have specific solutions, to the best of the authors’ knowledge. Hopefully, they will occur very seldom or, when they do, they will be diagnosed by tests derived for other faults.