| 摘要 |
<p>A data monitor apparatus includes a comparator circuit for comparing received data and reference data; a recorder circuit 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 comparator 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 output from the selector, and a second pointer responsive to an output 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.</p> |
