The increasing bandwidth requirements of mainstream computing and consumer products, as well as the inefficiency of embedded clock interfaces in terms of latency, protocol overhead and power requirements have caused the traditional source synchronous interfaces like DRAM memory to break the Gigabit range. Above 1Gbps dynamic effects like drift and jitter might become critical for traditional test approaches. At the same time the usage of dedicated source synchronous ATE HW solutions is challenged by the economic pressure and the flexibility requirements. This paper describes a new test methodology based on traditional ATE architecture which can deliver both, detailed characterization results or just a pass/ fail decision for a parametric validation in productiondepending on the actual test requirement.
Schlagwörter: Rechnergeführte Meßsysteme, meteorologische Station, Automatisierung, Fehlertoleranz, Robustheit Von einer automatischen Anlage wird in erster Linie eine hohe Verfügbarkeit erwartet. Nach einleitenden Betrachtungen zu fehlertoleranten Systemen werden Maßnahmen behandelt, die bei der automatischen Station AFMS-2 zur Steigerung der Robustheit in verschiedenen Stufen des Datenflusses eingeführt worden sind. Es folgt eine Erläuterung mikrorechnergestützter Diagnoseverfahren zur Erkennung von Fehlern und Störungen. Auf den automatischen Wiederanlauf und die Fehlerprotokollierung wird eingegangen. Robuste Bedienroutinen haben zu sichern, daß Fehleingaben den Echtzeitbetrieb nicht stören. Darüber hinaus werden Verfahren zur Ferndiagnose (über Telexanschluß) erwähnt. Für die Wartungsgruppen geschriebene EchtzeitTestprogramme werden umrissen. Abschließend wird auf den mit der Steigerung der Verfügbarkeit verbundenen Aufwand und Möglichkeiten zur Verbesserung der Information des Wartungsdienstes eingegangen. Above all, a high availability is expectedfrom an automatic device. After remarks, concerning fault-tolerant systems, measures for enhancement of robustness are treated introduced into the automatic station AFMS-2 at different stages of data flow. Then follows an explanation of microprocessor-based diagnostic methods used for detection of errors and faults. The automatic recovery facilities and the recording of malfunctions are outlined. Robust routines have to assure that erroneous attendance does not disturb the real-time operation. Moreover, capabilities of remote diagnosis (via telex link) are mentioned. Real-time test routines, written for the maintenance teams, are outlined. Finally, the extent for enhancement of availability and possibilities to improve the information of maintenance staff are discussed.
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