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AssigneeHitachi, Ltd.
InventorsNobuyasu Kanekawa, Shoji Suzuki, Yoshimichi Sato, Korefumi Tashiro, Keisuke Bekki, Hiroshi Sato, Makoto Nohmi, Shinya Ohtsuji
Estimating the term…
A self-checking circuit, which is useful for a highly reliable system configuration, includes a logic circuit having an error detection function. For function blocks for feeding out a plurality of signals that are at least duplexed, the logic circuit compares the output signals of the function blocks, and detects an error on the basis of results of the comparison. The logic circuit comprises synthesizing means provided to superimpose inherent waveforms assigned in advance to the respective output signals of the function blocks onto the output signals of one of the function blocks. The inherent waveforms are orthogonal waveforms generated by an orthogonal waveform generator circuit. The logic circuit also comprises comparison means for comparing a signal output of the synthesizing means with the signal output of the other function block to detect an error. The whole circuit including the function blocks are judged normal only if the waveforms inherent to both output signals exist.
A redundant logic circuit or system that has function blocks which are provided with an identical function and are at least dualized, comprising:
A fail-safe logic circuit or system that has function blocks which are provided with an identical function and are at least dualized and which provide an output to the external only when all the outputs from said function blocks match and stops the output or outputs an output to the external to guarantee safe side operation when outputs from the said function blocks do not match, comprising:
A logic circuit or system with a fault detecting function, for function blocks which are provided with an identical function and are at least dualized, for detecting faults in the said function blocks, comprising:
A redundant logical circuit or system, comprising:
A redundant logical circuit or system that has function blocks which are provided with an identical function and are at least dualized, comprising:
A fail-safe logic circuit or system that has function blocks which are provided with an identical function and are at least dualized, comprising:
A fail-safe logic circuit or system that has function blocks which are provided with an identical function and are at least dualized, comprising:
A logical circuit or system comprising:
A logical circuit or system with a fault detecting function, for function blocks which are provided with an identical function and are at least dualized, for detecting faults in the said function blocks by comparing outputs from both of the said at-least dualized function blocks, comprising:
A redundant logical circuit or system, comprising:
A redundant logical circuit or system, comprising:
A redundant logical circuit or system, comprising:
A redundant logical circuit or system, comprising:
Dependencies are inferred from the claim text.