JPS62136947A - Data transfer system - Google Patents

Abstract

PURPOSE:To apply efficient data transfer processing to plural lines by enabling program transfer to be interrupted during DMA transfer so as to apply data transfer. CONSTITUTION:While the DMA transfer is applied, since a central processing unit 2 is in standby of the end of DMA transfer end, an incoming notice code to other facsimile terminal equipment 10B is received from a line controller 8 as a control data signal 37 as the program transfer and the reception processing to the facsimile equipment 10B is attained. When the transfer of a picture data from a magnetic disc device 7 to the line controller 8 is finished, the central processing unit 2 applies program transfer to the cut-off request code to the line controller 8 as a control data signal 34. Thus, the line controller 8 applies line interruption processing to a facsimile equipment 10A.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a data transfer method in a storage and forwarding device, and in particular, the present invention relates to a data transfer method in a storage and forwarding device, and in particular, data transfer between multiple lines by changing the data transfer mode depending on the type of data. The present invention relates to a data transfer method that allows efficient transfer.

[Background of the invention]

In store-and-forward systems, especially in systems where large amounts of data such as facsimile information are stored in file memory,
A large number of lines are accommodated in a store-and-forward device, and the store-and-forward device is required to efficiently transfer data between each line. One system that satisfies such requirements is known, for example, as described in Japanese Unexamined Patent Publication No. 57-146338. According to this, in a transfer control device that accommodates a line and controls transfer to and from a central processing system, control signals are relayed and transferred via memory that can be accessed by the processor, and data signals are transferred to and from the processor. A large amount of data can be efficiently transferred to and from the central processing system by relaying the data through memory that is more inaccessible. In this case, the transfer control device functions as a line control device, but the answer does not specifically mention data transfer processing between the transfer control device and the central processing system device that has a data storage function. ing.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transfer system that allows efficient data transfer between a single-line controller and a central processing unit.

[Summary of the invention]

For this purpose, the present invention transfers control data between the line control device and the central processing unit by program transfer, and transfers image data other than control data by D.
Data transfer is performed by MA transfer. By performing data transfer while allowing program transfer to interrupt during DMA transfer, data transfer processing for multiple lines can be performed efficiently.

[Embodiments of the invention]

The present invention will be explained below with reference to FIGS. 1 to 3.

First, a facsimile storage and forwarding device will be explained using an example, and FIG. 1 shows its general configuration. According to this, the facsimile storage and forwarding device 1 has a central processing unit 2 and a line control unit 8 connected to the system bus 5.
．． It is configured such that the disk control device 6 and the bus control device 11 are connected. A main storage device 4 is also connected to the central processing unit 2 via a memory bus 3, and a magnetic disk device 7 for storing image data is connected to the system bus 5 via a magnetic disk control device 6. be.

Now, facsimile terminal 10 (IOA, IOB,
....

10N) is accommodated in the line control device 8 via the line 9, and this line control device 8 is provided with a buffer memory for control data and image data corresponding to the line. It controls transmission procedures between terminals 10A-1ON, and modulates and demodulates signals between terminals 10A-1ON.

The line control bag w8 is configured to exchange control data with the central processing unit 2 via the system bus 5, and to exchange image data with the magnetic disk device 7 via the system bus 5. be.

In this way, control data and image data are transferred on the system bus 5, but which data is transferred depends on the bus control device 11. Based on interrupts from the central processing unit 2 that performs program transfer and the magnetic disk control device 6 that performs DMA transfer, the bus control device 11
The right to use the system bus 5 is given to the central processing unit 2 and the magnetic disk control unit 6 with first priority given to the central processing unit 2. As a result, even if a DMA transfer is in progress, if there is an interrupt from the central processing unit 2, the DMA transfer will be temporarily interrupted so that the program transfer can be performed.

The configuration of the facsimile storage and forwarding device according to the present invention is as described above, but the transmission and reception operations with the primary facsimile terminal will be explained as follows.

That is, FIG. 2 schematically shows how control data and image data are transferred when receiving a signal from a facsimile terminal. According to this, 21.22
．． 24.25.27.28.29 indicate control data signals transferred between the line control device 8 and the central processing unit 2, of which 21.22.24.25°29 is sent to the facsimile terminal 10A, 27 .28 is facsimile terminal 10
It is related to B. Further, 23 indicates an image data signal from the facsimile terminal 10A, which is transferred between the line control device 8 and the magnetic disk device 7, and 26 indicates a DMA transfer time.

FIG. 3 schematically shows how control data and image data are transferred when transmitting a signal to a facsimile terminal. 31.32.34°35,37.
38 indicates a control data signal transferred between the line control device 8 and the central processing unit 2;
5 relates to the facsimile terminal 10A, and 37 and 38 relate to the facsimile terminal 10B. 33 is transferred between the line control device 8 and the magnetic disk device 7. The image data signal to be sent to the facsimile terminal 10A is shown, and 36 shows the DMA transfer time.

First, to explain the receiving operation, when there is an incoming call notification from the facsimile terminal 10A, the line control device 8 internally sets an incoming call notification code in the control data buffer memory corresponding to the corresponding terminal, and then sends the notification to the central The processing device 2 is notified. From this point on, the central processing unit 2 identifies the requesting terminal and transfers the incoming call notification code from the control data buffer 7 memory corresponding to the requesting terminal to the main storage device 4 via the system bus 5 as a program as a control data signal 21. 6 Next, in order to issue a guidance sending request to the facsimile terminal 10A, the central processing unit 2 sets a guidance sending request code in the main storage device 4, and also sends a control data buffer memory corresponding to the corresponding terminal in the line control device 8. The code is then transferred as a program via the system bus 5 as a control data signal 22. This allows guidance sending processing to be performed between the line control device 8 and the facsimile terminal 10A. After the predetermined reception processing is performed between the central processing unit 2 and the line control unit 8 by similar program transfer, the central processing unit 2 transmits the image data transfer request code from the line control unit 8 to the control data signal 29. As a result, the central processing unit 2 informs the magnetic disk controller 6 of the address and image data size of a predetermined image data storage area in the magnetic disk device 7, and the image data buffer memory corresponding to the terminal. After setting the address as a startup parameter, the magnetic disk control device 6 is started.

From this, the magnetic disk control device 6 having a DMA transfer function transfers both data buffered in the corresponding image data buffer memory from the facsimile terminal 10A to the magnetic disk device 7 via the system bus 5 as an image data signal 23. It is what it is. By the way, while this DMA transfer is being performed, the intermediate processing device 2 is in a state of waiting for the completion of the DMA transfer to the facsimile terminal 10A, so the incoming notification code from the other facsimile terminal 10B is programmed as the control data signal 27. By transferring, it becomes possible to receive the receipt. Even if the magnetic disk control device 6 monopolizes the system bus 5 through DMA transfer, if there is a program transfer request from the central processing unit 2 that has a higher priority than the magnetic disk control device 6, the system bus control Bag [11 is the magnetic disk control device 6
The system bus 5 is released from exclusive use by the central processing unit 2.
This is because the system bus 5 is given exclusive rights to the system bus 5. Eventually.

When the accumulation of image data by DMA transfer related to the facsimile terminal 10A is completed, a disconnection request code is program-transferred as a control data signal 24 from the central processing unit 2 to the line control device 8. Thereafter, the central processing unit 2 receives the line release code from the line control unit 8 as a control data signal 25 by program transfer, and this completes the series of processing for the facsimile terminal 10A. After this, facsimile terminal 10A
During the image data transfer process, the reception request code is transferred to the facsimile terminal 10B as a control data signal 28 from the central processing unit 2 to the line control unit 8, and a series of similar processes are performed. will continue to be implemented.

The reception operation is as described above, but the first transmission operation will be explained when the facsimile terminal 10
When a request for delivery of image data to A is made, the central processing unit 2 transfers a program to the line control unit 8 with a terminal activation request code for the facsimile terminal 10A as a control data signal 31. As a result, the line control device 8 performs terminal activation processing. Thereafter, the central processing unit 2 receives the image data transfer report code from the line control unit 8 as a control data signal 32 through program transfer, sets predetermined parameters, and starts the magnetic disk control unit 6. be. As a result, the magnetic disk controller 6 DMs the image data from the magnetic disk device 7 to the line controller 8 as an image data signal 33.
During this DMA transfer, the central processing unit 2 waits for the completion of the DMA transfer, so it sends the incoming call notification code to the other facsimile terminal 10B to the line as a control data signal 37. It is possible to receive the program by transferring it from the control device 8, and the reception to the facsimile terminal 10B can be processed. Thereafter, when the transfer of the image data from the magnetic disk device 7 to the line control device 8 is completed, the central processing unit 2 transfers the program to the line control device 8 with a disconnection request code as the control data signal 34. The device 8 performs line disconnection processing for the facsimile terminal 10A.

Thereafter, the central processing unit 2 receives the line release report code as a control data signal 35 from the line control bag w8 by program transfer, and completes the series of processing for the facsimile terminal 10A. After this, a series of similar processing is performed by transferring the guidance sending request code as a control data signal 38 to the facsimile terminal 10B, which was not processed during the image data transfer processing to the facsimile terminal 10A. will continue to be implemented.

In this way, image data transfer and control data transfer can be performed simultaneously in program processing.

It is possible to efficiently transfer data between multiple terminals without giving them a large waiting time.

〔Effect of the invention〕

As explained above, according to the present invention, line-compatible control data is transferred by program and image data is transferred by DMA, so control data transfer and image data transfer are simultaneously performed in response to data transfer requests from multiple lines. The advantage is that a large number of lines can be controlled and accommodated without giving each line a long waiting time.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a facsimile storage and forwarding device according to the present invention, and FIGS. 2 and 3 are diagrams for explaining transmission and reception operations with a facsimile terminal. DESCRIPTION OF SYMBOLS 1...Facsimile storage and forwarding device, 2...Central processing unit, 4...Main storage device, 5...System bus, 6
...Magnetic disk control device, 7...Magnetic disk device. 8... line control device, 10... facsimile terminal,
11... Bus control device.

Claims (1)

[Claims] A central processing unit that accommodates a main memory device via a memory bus, a secondary storage device for storing image data having a DMA transfer function, and a plurality of lines for transmitting control signals and data signals, and A line control device that sends and receives control signals and data signals to and from devices and secondary storage devices, a system bus to which each of the above devices is commonly connected, and a bus control that grants and controls the right to use the bus. A data transfer method in a storage and forwarding device consisting of a device, in which program transfer is possible during DMA transfer,
The transfer of control signals via the system bus between the line control unit and the central processing unit is performed by program transfer, while the transfer of data signals via the system bus between the line control unit and the secondary storage unit is carried out by DMA. A data transfer method characterized by transfer.