JPH037441A - Data transfer system - Google Patents

Abstract

PURPOSE:To simplify the processing to occurrence of error by assigning the priority to data transfer equipments connected in cascade, masking an error report from a subsequent data transfer equipment from a data transfer equipment having a data error and sending sequentially only a report of an error of the data error transfer device to a host equipment. CONSTITUTION:Suppose that a data error takes place in a data transfer equipment(DTRE) 3, an error detection section(ERD) 100 of the DTRE 3 detects an error and outputs the result of detection to a selection section(SEL) 102. The SEL 102 masks an error report when an error report detection section(RPD) 101 detects the error report from a subsequent DTRE, selects the result of detection from the ERD 100 and reports the occurrence of an error to a host DTRE (in this case, DTRE 2) via an error report line 32. Thus, the processing to the error is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer system, and more particularly to a data transfer system in which data is transferred using a plurality of cascaded data transfer devices.

[Conventional technology]

Conventionally, this type of data transfer system has reported all errors in each cascaded data transfer device to a higher-level device.

[Problem that the invention seeks to solve]

In the conventional data transfer method described above, all errors in the cascaded data transfer devices are reported, so there is a drawback that error processing is complicated.

[Means for solving problems]

The data transfer method of the present invention is a data transfer method in which data is transferred using a plurality of cascaded data transfer devices. a second error detection means for detecting an error report of the first . A special embodiment characterized in that it has a selection means for selecting the result of the second error detection means and a reporting means for reporting the output of the selection means to a host device. Next, the present invention will be described with reference to the drawings. I will explain.

FIG. 1(a) is a system block diagram showing an embodiment of the data transfer method of the present invention, and FIG. 1(b) is a block diagram of the data transfer device in FIG. 1(a).

As shown in Figure 1(a), a data transfer device (hereinafter DT
RE) 1, 2.3 are connected in cascade, the lower number DTRE is the higher-order device, and the data is transmitted through data lines 01, 12,
23.34, and errors shall be reported in the order of error reporting lines 43°32.21.10.

As shown in Figure 1(b), each DTRE is an upper DTRE.
An error detection unit (hereinafter referred to as BRD) 100 that detects errors in data sent from the DTRE, and an error report detection unit (hereinafter referred to as R
PD) 101, a selection unit (hereinafter referred to as 5EL) 102 that selects the output of ERDloo and RPD 101, and an upper DTR
Error reporting section (hereinafter referred to as RE P
) 103.

Next, the operation of this embodiment will be explained.

Here, if a data error occurs in the DTRE3, the ERD 100 in the DTRE3 detects the error and outputs the detection result to the 5EL102. 5EL102
Even if the RPD 101 detects an error report from the lower DTRE, it masks this, selects the detection result of ERDloo, and transmits the error report from the REP 103 to the upper DTRE (here, DTRE2) via the error report line 32.
) to report the occurrence of an error. In DTRE2, RPDl
ol detects this error report. At this time, DTRE2
If ERDloo does not detect any data errors,
5EL102 selects the output result of RPD 101 (that is, the error report from the lower DTRE) and sends it to REP10.
3 to the error report line 21. Each top D below
In the TR, this operation is repeated and an error report is made from the DTRE in which the data error has occurred to the highest level DTRE.

〔Effect of the invention〕

As explained above, the present invention assigns priorities to data transfer devices that are cascaded, masks error reports from data transfer devices lower than the data transfer device in which a data error has occurred, and only reports errors from the data error generating device. By sequentially sending the reports to the host device, processing for error occurrences is simplified, and there is an effect that the occurrence of secondary errors does not need to be detected.

103...Error reporting unit (REP).

Claims (1)

[Claims] In a data transfer method in which data is transferred by a plurality of cascaded data transfer devices, a first error detection means detects an error in data from a higher-order transfer device, and a second error detection means detects an error report from a lower-order transfer device. A data transfer method comprising: an error detection means; a selection means for selecting the results of the first and second error detection means; and a reporting means for reporting the output of the selection means to a host device.