Apparatus providing improved diagnosability

Details Apparatus providing improved diagnosability Apparatus providing improved diagnosability

G - Physics

06

F

354/225

G06F 11/26 (2006.01) G01R 31/3185 (2006.01) G06F 11/22 (2006.01)

Patent

CA 1268550

52002991 "PATENT" ABSTRACT OF THE INVENTION An apparatus for storing information contained in a selected digital data signal comprises a selector. A first input terminal receives an operational digital data signal when the apparatus is operating in a normal mode, a second input terminal receives a shifted test data signal when the apparatus is operating in a maintenance mode, and a third input terminal is operatively connected to a signal having a constant reset state. The selector operatively connects one of the first, second,and third input terminal to the output terminal of the selector in response to a first and second control signal. A storage element, having a clock input terminal adapted to receive a clock signal and having a reset terminal adapted to receive a reset signal, stores the state present at the selected input terminal of the selector coincident with the clock signal. A switching element coupled the second control signal to the reset terminal of the storage element when the apparatus is in the normal mode thereby causing the apparatus to be placed in a reset state immediately upon the occurrence of the second control signal asynchronously to the clock signal, and coupled the second control 52002991 "PATENT" signal to the selector in the maintenance mode thereby causing the third input terminal of the selector to be operatively connected to the output terminal of the selector causing the apparatus to be placed in the reset state coincident with he clock signal, the second control signal having priority over the first control signal in the selection of the input terminals of the selector.

522035

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