Data monitor apparatus

Details Data monitor apparatus Data monitor apparatus

H - Electricity

04

L

340/71

H04L 1/20 (2006.01) G06F 11/30 (2006.01) H04L 1/24 (2006.01)

Patent

CA 1272260

ABSTRACT OF THE DISCLOSURE A data monitor apparatus includes a comparator circuit for comparing received data and reference data; a recorder cir- cuit for recording an output from said comparator circuit; a pointer control circuit composed of a first counter responsive to a comparison result of the comparator circuit, a first setting unit for setting a remaining count value of the first counter, a second counter responsive to a comparison result of the compara- tor circuit, a second setting unit for setting a remaining count value of the second counter; a selector for accepting the received data as an input; a first pointer responsive to an out- put from the selector, and a second pointer responsive to an out- put from the selector; and a compressed data recorder circuit composed of a first recorder circuit for recording the received data with use of the first pointer and a second recorder circuit for recording the received data with use of the second pointer. With such arrangement, the received data and reference data are compared, and if there is any abnormality, only data the vicinity of a portion of the data having the abnormality is recorded, whereby a troubled portion can be found with ease from the recorded data.

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