JPH0537498A - Abnormality monitoring method of transmission line - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a transmission line abnormality monitoring system in the case where signals are individually transmitted in parallel to a plurality of transmission lines 1 from a transmission side to a reception side through each transmission line 1. It is an object of the present invention to reduce the cost and the number of transmission lines and to be applicable to the case where a receiving device having a simple structure is used. A sending-side check-bit generating means 2 is provided on the sending-side and generates a synthetic check-bit for the signals individually transmitted in parallel through the transmission lines 1 on the sending-side, and is provided on the receiving-side. And
Receiving side check bit generation means 3 for generating combined check bits for the signals transmitted in parallel through the respective transmission lines 1 on the receiving side, and the transmitting side check bit generation provided on the transmitting side. An abnormality detecting means 4 for detecting an abnormal state of the transmission path 1 by comparing the synthetic check bit generated by the means 2 with the synthetic check bit generated by the receiving side check bit generating means 3 and transmitted from the receiving side. Configure to include.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a signal is individually transmitted in parallel from a sending side to a receiving side through a plurality of transmission lines through a plurality of transmission lines. The present invention relates to a transmission line abnormality monitoring method for detecting an abnormal state of a transmission line in which signal transmission becomes impossible due to a failure of a signal transmission circuit, a signal reception circuit, or the like provided in the transmission line.

[0002]

2. Description of the Related Art Conventionally, there are the following types of abnormality monitoring systems for this type of transmission line. A composite check bit, which is generated at the transmission side that is the transmission side and is transmitted in parallel through each transmission path, is sent to the reception side that is the reception side. On this receiving side, the combined check bits sent from the sending side and accepted by the receiving side, and the combined check bits for the signals transmitted individually in parallel through each transmission path generated on this receiving side, And the abnormal state of the transmission path is detected, and an abnormal detection signal based on the detection of this abnormal state is sent back from the receiving side to the transmitting side.

On the transmitting side, an input side which is a (signal) transmitting side to the signal transmitting circuit in each signal transmitting circuit provided in each transmission line, and an output which is a (signal) receiving side from the signal transmitting circuit The abnormal state of the transmission line is detected by comparing the signal with the side.

[0004]

However, the above-mentioned ones have the following problems. Regarding the receiving side, in order to detect the abnormal state of the transmission line on the receiving side, the transmission line that sends the composite check bit of the transmitting side from the transmitting side to the receiving side and the transmission that sends back the abnormal detection signal from the receiving side to the transmitting side by detecting the abnormal state At least 2 with the road
There is a problem that the number of transmission lines is required. Further, since it is necessary to provide an abnormality detection circuit or the like for detecting an abnormal state of the transmission line on the receiving side, there is a problem that it is difficult to apply it to a receiving device having a simple configuration. Furthermore, since the number of receivers is usually larger than the number of transmitters, the cost is considerably increased as a whole when an abnormality detection circuit or the like is provided on the receivers.

With respect to the above, it is necessary to provide an abnormality detection circuit or the like for detecting an abnormal state for each transmission line, and thus there is a problem that the cost also rises considerably.

The present invention aims to solve the above problems and can reduce the cost and the number of transmission lines, and can also be applied to abnormalities of transmission lines which are applicable even when a receiving device having a simple structure is used. It is intended to provide a monitoring method.

[0007]

In order to achieve the above-mentioned object, a transmission line abnormality monitoring system according to the present invention is described in FIG.
As shown in the block diagram of the principle configuration of the transmission line, an abnormality monitoring system for transmission lines in the case where signals are individually transmitted in parallel through a plurality of transmission lines 1 from a transmission side to a reception side through each transmission line 1 In (a) the sending side check bit generating means 2, (b) which is provided on the sending side and generates a synthetic check bit for signals transmitted in parallel through the transmission lines 1 on the sending side. ) Receiving side check bit generation means 3 which is provided on the receiving side and generates combined check bits for the signals transmitted in parallel through the respective transmission lines 1 on the receiving side, and (c) the sending side And the receiving side generated by the receiving side check bit generating means 3 and the combined check bit generated by the sending side check bit generating means 2. It is characterized in that it comprises an abnormality detecting means 4 for detecting an abnormal state of the transmission line 1 by comparing the synthetic check bits et transmitted.

[0008]

When the signals are individually transmitted in parallel from the sending side to the receiving side through the respective transmission lines 1, the sending side check bit generating means 2 provided at the sending side individually send the signals in parallel. Generate a composite check bit for. Further, the receiving side check bit generating means 3 provided on the receiving side generates a combined check bit for a signal which is individually sent out in parallel through each transmission line 1 and accepted, and this combined check bit is transmitted and sent out. Sent back to. Thus, on the sending side, the abnormality check means 4 provided on the sending side compares the combined check bit from the sending side check bit generating means 2 with the returned combined check bit from the receiving side check bit generating means 3. Transmission line 1
The abnormal state of is detected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of a transmission line abnormality monitoring system according to the present invention will be described with reference to the drawings. Figure 2
In the above, a transmitting device or a transmitting package 12 is provided on the transmitting side and a receiving device or a receiving package 13 is provided on the receiving side with respect to the plurality of signal lines 11. This transmission package 12 is composed of a large-scale integrated circuit LSI14, and inside the LSI14, L is provided for each signal line 11.
An LSI signal transmission circuit 15 which is an output driver of SI14 is provided.

Further, inside the LSI 14, an LSI signal transmission circuit on the signal transmission side to the LSI signal transmission circuit 15 is provided.
At the input side of 15, there is provided a first parity generation circuit 16 for generating a composite redundant bit for parity check for the signals individually sent in parallel through each signal line 11. The combined redundant bit generated in the first parity generation circuit 16 is similarly supplied to the comparison circuit 17 provided inside the LSI 14.

By the way, L in the transmission package 12
Outside the SI14, a transmission package corresponding to each signal line 11
A package signal transmission circuit 18, which is 12 output drivers, is provided. Outside the LSI 14, the input side of the package signal transmitting circuit 18, in other words, the output side of the LSI signal transmitting circuit 15 which is a receiving side of the signal to the LSI signal transmitting circuit 15, is also individually connected through each signal line 11. A second parity generation circuit 19 is provided which generates a composite redundant bit for parity check for signals sent in parallel. This second parity generation circuit 19
The composite redundant bit generated in
Given to.

In this way, in the comparison circuit 17, the redundant bits from the first and second parity generation circuits 16 and 19 are compared, and if they do not match, in the transmission line of the signal line 11 including the LSI signal transmission circuit 15. An alarm signal is output when an abnormal condition is detected. Reference numeral 20 is a package signal receiving circuit provided corresponding to each signal line 11 in the receiving package 13.

According to this embodiment, since the abnormal state of the signal line 11 is detected only on the transmitting side, the abnormality of the signal line 11 can be monitored simply by replacing the transmission package 12 in this embodiment with a conventional one. Further, since the abnormal state is detected by comparing the composite redundant bits, it is not necessary to provide the comparison circuit 17 for each signal line 11 and the abnormal state is detected by the comparison circuit 17 which is smaller than the number of the signal lines 11. In addition, the number of input pins for fetching the composite redundant bit from the second parity generation circuit 19 to the inside of the LSI 14 is small, and the LSI 14
It is easy to provide a processing circuit including the comparison circuit 17 for detecting the abnormal state of the signal line 11 inside.

Next, a modified example of the present embodiment will be described sequentially with reference to the drawings. The same reference numerals in the present embodiment indicate the same contents, and the duplicated description will be omitted. i) First modification (see FIG. 3) In the case where the second parity generation circuit 19 is provided on the output side of the package signal reception circuit 20 provided corresponding to each signal line 11 in the reception device or the reception package 13 ′. is there. In this case, the redundant bit signal transmitting circuit 21 is provided in the receiving package 13 ′ and the redundant bit signal receiving circuit 22 is provided in the transmitting package 12, and the combined redundant bit from the second parity generating circuit 19 is transmitted through the signal line 23. Comparison circuit 17 inside the LSI 14 inside the transmission package 12
Given to. A reception package similar to the reception package 13 of this embodiment may be provided after the reception package 13 '.

Ii) Second modification (see FIG. 4) The transmission package 12 in the first modification with respect to the signal line 11
The case where another receiving device or the receiving package 13 "is provided between the receiving package 13 'and the receiving package 13', and the other is the same as that of the first modification. In addition, 20 'is a package signal receiving circuit and 21 'is a redundant bit signal sending circuit, 2
2'is a redundant bit signal receiving circuit.

Iii) Third Modified Example (see FIG. 5) This is a combination of the first modified example and the second modified example, and the combined redundant bit is the second in each of the receiving packages 13 ', 13 "'. Is the same as in the first and second modifications except that 23 is an OR circuit.

Iv) Fourth Modification (Refer to FIGS. 6A, 6B, and 6C) When there are many signal lines 11 to be monitored, the first and second parity generation circuits 16 and 16 'are provided. , 19,19 'and further OR
This is the case where the circuits 23, 23 ', 23 "and the like are combined.

According to the above modification, the receiving package 13 ',
An abnormal state of the signal line 11 including 13 "and 13"'can be detected, and in the case of the second and third modifications, the receiving package 1
It is possible to detect an abnormal condition due to missing 3 "and 13"'packages.

Although the second parity generating circuit 19 is provided on the output side of the package signal receiving circuit 20 in the receiving packages 13 ', 13 "' in this modification, it goes without saying that it may be provided on the input side. ..

The transmission line 1 according to the present invention is the signal line 11 including the LSI signal transmission circuit 15 and the like in the present embodiment and the modification, and the transmission side check bit generating means 2 in the present invention is the same as in the embodiment and the modification. Corresponding to the first parity generating circuits 16 and 16 ', the receiving side check bit generating means 3 in the present invention corresponds to the second parity generating circuits 19 and 19' in the present embodiment and the modified examples, and the abnormality in the present invention. The detection means 4 corresponds to the comparison circuit 17 and the like in the present embodiment and the modified examples.

[0021]

As described above, according to the present invention, when signals are individually transmitted in parallel through the respective transmission paths, the signals transmitted in parallel at the signal transmission side are combined. An abnormal state of the transmission line is detected by comparing the check bit with the synthetic check bit for the signal individually sent out in parallel through each transmission line and received. Therefore, it is not necessary to provide an abnormality detecting means on the receiving side, and it is not necessary to provide an abnormality detecting means for each transmission line, so that the cost can be reduced, and at the time of detecting an abnormal state, the transmission lines can be individually connected in parallel. Since it is sufficient that there is only a transmission path for sending back the composite check bit for the signal that is sent out and accepted from the receiving side to the sending side, the number of transmission paths can be reduced.

Further, since the abnormality detecting means is provided on the sending side and does not need to be provided on the receiving side, it can be applied to a receiving device having a simple structure. Furthermore, the sending side is L
When configured by SI, it is possible to incorporate the sending-side check bit generation means and the abnormality detection means inside this LSI, and by doing so, the number of input / output pins of the LSI can be reduced. it can.

[Brief description of drawings]

FIG. 1 is a principle block diagram for explaining the principle configuration of an abnormality monitoring system for a transmission line according to the present invention.

FIG. 2 is a block circuit diagram of a specific embodiment of a transmission line abnormality monitoring system according to the present invention.

FIG. 3 is a block circuit diagram of a first modified example.

FIG. 4 is a block circuit diagram of a second modified example.

FIG. 5 is a block circuit diagram of a third modified example.

FIG. 6 is a block circuit diagram of a fourth modified example.

[Explanation of symbols]

 1 transmission line 2 sending side check bit generating means 3 receiving side check bit generating means 4 abnormality detecting means 11,23 signal line 12 sending package 13,13 ', 13 ", 13"' receiving package 14 LSI 15 LSI signal sending circuit 16 , 16 'First parity generation circuit 17 Comparison circuit 18 Package signal transmission circuit 19,19' Second parity generation circuit 20,20 ', 20 "Package signal reception circuit 21,21', 21" Redundant bit signal transmission circuit 22,22 ', 22 "Redundant bit signal receiving circuit 23,23', 23" OR circuit

Claims (1)

Claim: What is claimed is: 1. A transmission line abnormality monitoring method in the case where signals are individually transmitted in parallel to a plurality of transmission lines 1 from a transmission side to a reception side through each transmission line 1, wherein: a) Sending side check bit generation means 2 which is provided on the sending side and generates combined check bits for the signals transmitted in parallel through the respective transmission lines 1 on the sending side, (b) receiving side And a receiving side check bit generating means 3 for generating a composite check bit for the signals transmitted in parallel through the transmission lines 1 on the receiving side, and (c) a transmitting side. At the same time, the composite check bit generated by the sending side check bit generating means 2 and the synthetic check bit generated by the receiving side check bit generating means 3 are transmitted from the receiving side. Transmission path error monitoring method of the synthetic check bits, characterized in that it comprises an abnormality detecting means 4 for detecting an abnormal state of the transmission line 1 to compare that.