Data processing system and information scanout employing...

Details Data processing system and information scanout employing... Data processing system and information scanout employing...

G - Physics

06

F

354/227

G06F 11/30 (2006.01) G06F 11/00 (2006.01) G06F 11/277 (2006.01)

Patent

CA 1117662

ABSTRACT OF THE DISCLOSURE A data processing system having a principal apparatus, such as a programmable large-scale data processing system, and a secondary apparatus. The secondary apparatus performs fault detection and analysis on the princi- pal apparatus. The secondary apparatus under control of a secondary program and independently from the principal apparatus, accesses information from different points, such as latch circuits, throughout the principal appar- atus. The accessed information is utilized by the secondary apparatus to form an actual checksum having a value determined by the accessed informa- tion. The actual checksum thus formed is compared with an expected checksum provided from storage by the secondary apparatus. If the actual and expect- ed checksums are different, a fault condition is indicated. An analysis of selected subsets of points in the primary apparatus is made using a compact- ed scan composed of the values of the selected subset of points.

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