JPS644706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes: a data transmitting section that has a memory (buffer memory) that temporarily stores data and continuously transmits data to a data receiving device; an accumulating section that accumulates data; A separate buffer memory is provided between the data transmitting section and the storage section, and converts the transfer unit, transfer speed, etc. of the data transferred from the storage section in fixed units, and requests from the data transmitting section. Relating to a notification method when each buffer memory underflows in a data transmission system comprising a data transfer unit that transmits data to the data transmission unit in fixed units according to the data transmission unit, and a control unit that controls each of these units. It is.

Conventionally, in a data transmission system having this type of two-stage buffer, when the buffer memory of the data transfer section or the data transmission section underflows, the underflow abnormality has been dealt with by the following method. That is, one method is to notify the control unit of the occurrence of an abnormality and interrupt processing when an underflow occurs in either the data transfer unit or the data transmission unit, and the other is to notify the control unit of the occurrence of an abnormality and interrupt processing. This is a method that does not check for the occurrence of a flow abnormality, but only when an underflow occurs in the data transmission section, notifies the control section of the occurrence of an abnormality and interrupts processing. Of these, the former method allows the control unit to clearly identify which memory transfer error occurred, the data transfer unit or the data transmission unit, and it is easy to isolate the fault for maintenance. Since the process is interrupted even if an underflow occurs in the section, there is a drawback that the probability that the process will be interrupted is high. In other words, in a data transmission system with a two-stage buffer, even if the data transfer from the storage section to the data transfer section is delayed for some reason, as long as an underflow does not occur in the data transmission section, the data transmission to the receiving device will continue. can be continued, and if the processing is interrupted one by one in such a case, speeding up of the processing will be hindered. On the other hand, with the latter method, it is possible to avoid processing interruptions as much as possible, but when an error occurs, it is difficult to determine in which data transfer an abnormality has occurred, from the storage section to the data transfer section or from the data transfer section to the data transmission section. I don't understand, and it is difficult to isolate the problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an abnormality notification method that suppresses processing interruptions due to the occurrence of the abnormality as much as possible and facilitates failure isolation in the control unit.

In order to achieve the above object, the present invention is designed to memorize the occurrence of an underflow abnormality even if an underflow abnormality occurs in the data transfer unit, and in this state, the data transmission unit notifies the user that a similar underflow has occurred. When it was done,
For the first time, an abnormality in the data transfer unit is reported to the control unit and processing is interrupted.

Hereinafter, the contents of the present invention will be explained in detail with reference to the drawings.

The figure shows one embodiment of the present invention, in which 1 is a control unit;
2 is a storage section, 3 is a data transfer section, and 4 is a data transmission section. The data transfer unit 3 includes a memory control circuit 5,
receiving circuit 6, transmitting circuit 7, buffer memory 8,
9. Underflow occurrence storage register 10, AND
It consists of circuits 11, 12, etc. Further, the data transmitter 4 includes a memory transfer control circuit 13 and a buffer memory 1.
Consists of 4,15. 16 is a receiving device.

The operation of this embodiment is as follows. Buffer memories 8 and 9 are stored in the memory control circuit 5 of the data transfer unit 3.
When either side becomes empty (in this case, the buffer memory 9 is empty), a data transfer request is made to the control unit 1 through the data request line 106. When the control unit 1 receives the data transfer request, it instructs the storage unit 2 to transfer the data through the data transfer command line 114, and transfers the data from the storage unit 2 to the data transfer unit 3 through the data transfer path 101. urge In the data transfer section 3, the data is received by the receiving circuit 6, and the data is temporarily stored in the empty buffer memory 9 via the changeover switch 17 under the control of the memory control circuit 5. On the other hand, in the data transmitter 4, under the control of the memory transfer control circuit 13, a buffer memory (in this case, a buffer memory 15) in which data is accumulated is transmitted.
data is continuously transmitted from the receiving device 16 via the data transfer path 103. At the same time, the memory transfer control circuit 13
4 and 15, and when either side becomes empty, requests the data transfer unit 3 to transfer data via the data request line 107. In the memory control circuit 5 of the data transfer section 3, the data transmission section 4
When a data transfer request is received from the data transfer section 7, the transmitting circuit 7 is controlled to transfer the data from the buffer memory (here referred to as buffer memory 8) in which the data is stored to the data transmitting section 4 via the changeover switch 18.

While the data transmission operation described above is continuing, data transfer from the storage section 2 is delayed for some reason, and when the memory control circuit 5 receives a data transfer request from the data transmission section 4, the data to be transferred to the buffer memories 8 and 9 is detected. Suppose that a situation arises in which there is no remaining. At this time, the memory control circuit 5 sets "1" to the underflow occurrence storage register 10 via the underflow occurrence storage register set line 108, and waits for data transmission until the data transfer from the storage section 2 is completed.

On the other hand, in the data transmitter 4, the buffer memory 1
While data remains in 4 and 15, the receiving device 16
However, when the buffer memories 14 and 15 are all empty, data transmission cannot be continued and the process has to be stopped. At this time, the memory transfer control circuit 13 interrupts the data transmission process and notifies the data transfer unit 3 of the occurrence of an underflow via the notification line 111. When the data transfer unit 3 is notified of the occurrence of an underflow from the data transmission unit 4,
When the underflow occurrence storage register 10 is set to "1" by the action of the AND circuits 11 and 12, the data transfer section 3 is sent to the control section 1 via the data transfer section underflow occurrence notification line 113. An underflow occurs in the data transmitter 4, which causes an underflow in the data transmitter 4 as well, and notifies that the data transmission has been interrupted. On the other hand, when the underflow occurrence storage register 10 is reset to "0", the data transmission section 3 and the data transmission section 4 are connected to the control section 1 via the data transmission section underflow occurrence notification line 112. The data transfer is delayed, an underflow occurs in the data transmitter 4, and the data transmission is interrupted.

Further, even if the memory control circuit 5 of the data transfer section 3 underflows once and sets "1" in the underflow occurrence storage register 10, the data transfer from the storage section 2 is completed after that, and the data transmission section 4
If a notification of underflow occurrence does not come from the data transmitting unit 4 until a certain amount of data has been transferred after completing the data transfer, the temporary underflow state in the data transmitting unit 3 is detected. Assuming that no underflow occurs in the data transmitter 4, the underflow occurrence storage register 10
Underflow occurrence storage register reset line 10
9 to "0".

Because of this structure, in this data transmission system having a two-stage buffer, the data transmission process is continued until the final stage buffer memories 14 and 15, which transmit data to the data receiving device, are all empty. In addition, when an underflow occurs, the control unit 1 clearly determines in which buffer memory the underflow occurred based on the state of the notification line 112 or 113.

Thereby, the control unit 1 can notify, for example, a maintenance person which abnormality has occurred by displaying a lamp or the like. Furthermore, for example, in a system that includes a plurality of data transfer units and data transmission units and has a backup device that can be automatically switched, it is also possible to automatically switch to the backup device and recover from a failure state.

As explained above, the abnormality notification method in this data transmission system allows data transmission processing to continue until an underflow occurs in the buffer memory at the final stage, but in the event that an underflow occurs, in which part the underflow occurs. Since it is possible to determine whether a failure has occurred, there is an advantage that maintenance when a failure occurs is facilitated while avoiding interruption of data transmission processing as much as possible.

[Brief explanation of the drawing]

The figure is a block diagram of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Control part, 2...Storage part, 3...Data transfer part, 4...Data transmission part, 5...Memory control circuit, 6...Reception circuit, 7...Transmission circuit, 8, 9...
...Buffer memory, 10... Underflow occurrence storage register, 11, 12... AND circuit, 13...
...Memory transfer control circuit, 14, 15... Buffer memory, 16... Receiving device, 17, 18... Changeover switch.

Claims (1)

[Claims] 1 has a first memory for temporarily storing data,
a data transmitting unit that continuously transmits data to the data receiving device; a storage unit that accumulates data;
a second memory that is located between the data transmitter and the storage unit and temporarily stores data; a transfer unit of data transferred from the storage unit in fixed units;
a data transfer unit that converts the transfer speed, etc. and transmits data to the data transmission unit in fixed units in response to a request from the data transmission unit; and a data transfer unit that controls data transfer from the storage unit to the data transfer unit. In a data transmission system consisting of a control unit,
When the data transfer unit delays data transfer from the storage unit and the second memory underflows, the data transmission unit continues processing without merely storing the occurrence of the underflow abnormality. When a similar underflow occurs in the first memory of the data transmitting unit, the control unit is notified of the occurrence of an underflow abnormality in the data transfer unit, and the data transfer unit does not remember the occurrence of the underflow abnormality. An abnormality notification method in a data transmission system, characterized in that when an underflow occurs in the first memory of the data transmission unit, the control unit is notified of the occurrence of an abnormality in the data transmission unit.