JPH04275661A - Data transfer device - Google Patents

Abstract

PURPOSE:To satisfy I/O interface time by quickly transmitting stop direction due to a fault and interruption direction from software to the opposite device. CONSTITUTION:A decision circuit 310 of a channel 3 decides whether or not the data transferred from a central processing unit 1 and a main storage device 2 are normal or emergency data. When the emergency data is detected at the time of transferring data to a remote controller 5, the emergency data is transferred by suppressing the transfer of the normal data. When a fault detection circuit 570 of the remote controller 5 detects the fault generated in its own device or a transfer abnormality detection circuit 580 detects the fault of the transfer data transferred from the channel 3, an emergency data generation circuit 560 generates the emergency data so as to be transferred through a transfer processing circuit 540 and a transfer circuit 550 to the channel 3. In the channel 3, a decision circuit 420 decides the data transferred from a remote controller is the normal or emergency data, and when the emergency data is detected at the time of data transfer from the channel 3 to the central processing unit 1 and the main storage device 2, the emergency data is transferred first by suppressing the normal data transfer.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device for a remote control device connected to a central processing unit and a main storage device via an optical fiber.

0002

[Prior Art] Conventionally, this type of data transfer device is shown in FIG.
As shown in the block diagram of FIG. and is transferred to the remote control device 50 via the optical cable a. In the remote control device 50, the data received by the receiving circuit 510 is stored in a data buffer 520, and the received data processing circuit 53
Process with 0. On the other hand, the data sent from the input/output device 6 to the remote control device 50 and the error frame created by the error frame creation circuit 590 are sent to the transfer data processing circuit 54 in the order in which they are received by the transfer data processing circuit 540.
0 to the transfer circuit 550 and sent to the channel 30 via the optical cable b. In channel 30, receiver circuit 4
The data and error frames received in step 10 are stored in the data buffer 420 in the order in which they were sent from the remote control device 50.
and sends them to the central processing unit 1 and the main storage device 2 in the order in which they are stored.

0003

[Problems to be Solved by the Invention] This conventional data transfer device is connected by optical fiber and has a large-capacity data buffer, so during normal data transfer, it is difficult to receive an instruction to stop transfer/processing due to a failure. Urgent data such as interruption instructions from software were also stored in the data buffer without being distinguished from normal data, so if all the transferred data was not transferred to the other device, the urgent data would Not transferred. Therefore, there is a problem that the interruption/stopping instruction or failure processing is delayed, making it impossible to satisfy the time regulations of the input/output interface.

0004

[Means for Solving the Problems] A data transfer device of the present invention includes a remote control device connected to a central processing unit and a main storage device via a channel, and an input/output device connected to the remote control device. The channel has a first determining means for determining whether data transferred from the central processing unit and the main storage device is normal data or emergency data, and a first determining means for determining whether data transferred from the central processing unit and the main storage device is normal data or emergency data; a first transfer means that transfers the urgent data with priority over normal data when the first determination means detects emergency data when transferring data; and a first transfer means that transfers the urgent data with priority over normal data; comprising a second determining means for determining whether the data is normal data or emergency data; and a second transferring means for transmitting the emergency data with priority over the normal data when the second determining means detects emergency data; The remote control device includes first detection means for detecting a fault in transfer data transferred from the channel, and second detection means for detecting a fault occurring within the remote control device itself.
and emergency data generation means for generating emergency data based on the failure detected by the first and second detection means.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a data transfer device according to the present invention. Channel 3 includes a determination circuit 310, an overtaking buffer 320, a switching circuit 340, a transfer circuit 350, a switching instruction circuit 360, a determination circuit 420, an overtaking buffer 440, and a switching circuit 450 in addition to the conventional channel 30.
, a switching instruction circuit 460 is added. Further, the remote control circuit 5 is configured by providing an emergency data generation circuit 560 in place of the error frame generation circuit 590 in the conventional remote control device 50.

Next, the operation of this embodiment will be explained. Data from the central processing unit 100 and main memory 200 is transferred to channel 3 via data line c. channel 3
Then, the determination circuit 310 stores the transferred data in either the data buffer 330 or the overtaking buffer 320, and when emergency data is detected, the switching instruction circuit 36
Notify 0 of emergency data transfer. Overtaking buffer 320
When the data is stored, the switching instruction circuit 360 issues an instruction to the switching circuit 340 to suppress the output of the data buffer 330 and send the output of the overtaking buffer 320 to the transfer circuit 350. The data sent to the transfer circuit 350 is sent to the remote control device 5 via the optical cable a. In the remote control device 5, the sent data is sent to the receiving circuit 5.
10 and stores it in the data buffer 520. The output of the data buffer 520 is sent to a received data processing circuit 530 to process normal data and emergency data separately.

Data transferred from the input/output device 6 to the channel 3 is transferred to the transfer data processing circuit 54 of the remote control device 5.
Sent to 0. Transfer error detection 58 that detects an error in data transferred from channel 3 via optical cable a
0. When the failure detection circuit 570 that collects failures detected in the remote control device 5 notifies the emergency data generation circuit 560 of the occurrence of a failure, the emergency data generation circuit 560
generates emergency data and sends it to the transfer data processing circuit 540. The transfer data processing circuit 540 sends the data from the input/output device 6 and the data from the emergency data generation circuit 560 to the transfer circuit 550 in the order in which they are received. The data sent to transfer circuit 550 is transferred to channel 3 via optical cable b. In channel 3, this data is sent to the receiving circuit 410.
After the determination circuit 420 stores the normal data in the data buffer 430 and the emergency data in the overtaking buffer 440, the determination circuit 420 notifies the switching instruction circuit 460 that the emergency data has been stored in the overtaking buffer 440. do. Switching instruction circuit 460 that received the notification
The switching circuit 450 suppresses the output of the data buffer 380 and sends the output of the overtaking buffer 440 preferentially to the central processing unit 1 via the data line c.

[0009]

Effects of the Invention As explained above, the present invention provides priority to urgent data over normal data by providing a channel device with an overtaking buffer and a switching circuit when data is transferred between a channel device and a remote control device. Since urgent data can be transferred to the other device faster than the number of data stored in the data buffer,
This has the effect that a stop instruction due to a failure or an interruption instruction from software is quickly transferred to the other device, and the time regulations of the input/output interface can be satisfied.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a data transfer device of the present invention.

FIG. 2 is a block diagram showing an example of a conventional data transfer device.

[Explanation of symbols]

1 Central processing unit 2 Main storage device 3, 30 Channels 5, 50 Remote control device 6 Input/output device 310 Judgment circuit 320, 440 Overtaking buffer 330, 430
, 520 data buffer 340, 450
Switching circuit 350 Transfer circuit 360, 460 Switching instruction circuit 410, 510 Receiving circuit 420 Judgment circuit 530 Received data processing circuit 540 Transfer data processing circuit 550 Transfer circuit 560 Emergency data generation circuit 570 Failure detection circuit 580 Transfer abnormality detection circuit

Claims (1)

[Claims] 1. A remote control device connected to a central processing unit and a main storage device via a channel, and an input/output device connected to the remote control device, the channel being connected to the central processing unit. and a first determining means for determining whether data transferred from the main storage device is normal data or emergency data, and the first determining means when transferring data from the channel to the remote control device. a first transfer means that transfers the urgent data with priority over normal data when the means detects emergency data; and a second transfer means that determines whether the data transferred from the remote control device is normal data or emergency data. and a second transfer means that transfers the urgent data with priority over normal data when the second judgment means detects emergency data, and the remote control device transfers the emergency data from the channel. a first detection means for detecting a failure in the transferred data;
The remote control device is characterized by comprising a second detection means for detecting a failure occurring within the remote control device, and an emergency data generation means for generating emergency data based on the failure detected by the first and second detection means. Data transfer device.