JPS63128456A - Data transfer system - Google Patents

Abstract

PURPOSE:To improve the processing efficiency with a data transfer system by reading instructions out of an instruction table in the stored order at every end of transfer of data to start the transfer of data when the read-out instruction indicates the transfer of data and to produce an interruption to a data processor with an interruption request order. CONSTITUTION:An instruction detecting means 25 decides whether the instruction read out by an instruction reading means 24 indicates the transfer of data or the request for an interruption. A transfer start means 26 starts the transfer of data between a data processor 1 and a data transfer subject device 3 based on the data transfer instruction when the means 25 decides that the data transfer instruction is read out by the means 24. Then the control is shifted to an instruction reception detecting means 21. While an interruption processing means 27 produces an interruption to inform the processor 1 the end of transfer of data when the means 25 decides that an interruption request instruction is read out by the means 24. Then the control is shifted to the means 21. In such a way, the data processing efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer method, and particularly to a data transfer method in a data processing system.

[Conventional technology]

Conventionally, in this type of data transfer method, when a data transfer request occurs in a data processing device, the data transfer target device such as an input/output device (in the case of a data processing device other than the data processing device requesting the data transfer) A data transfer command is issued to a data transfer control device (hereinafter described as an input/output control device) that controls a data transfer control device (described below as an input/output device). The received input/output control device starts data transfer between the data processing device and the input/output device based on the data transfer command, and when the data transfer is completed, the input/output control device generates an interrupt to the data processing device. I was worried.

FIG. 3 is a flow chart showing an example of the processing of the conventional data transfer method described above. The processing of an example of the conventional data transfer method includes a data transfer command reception detection step 31, a data transfer activation step 32, and a data transfer execution detection step 3.
3 and an interrupt step 34.

Next, the operation of an example of a conventional data transfer system will be described with reference to FIG.

First, a data transfer command is issued from the data processing device,
It is determined whether reception of the data transfer command is detected by the input/output control device (step 31).

If reception of a data transfer command is not detected in this determination, the determination in step 31 is performed until reception of a data transfer command is detected.

When reception of a data transfer command is detected in step 31, data transfer between the data processing device and the input/output device is started based on the data transfer command (step 32).

A determination is made as to whether the initiated data transfer is being executed to detect the end of the data transfer (step 3).
3) When the end of the data transfer is detected, an interrupt is generated from the input/output control device to the data processing device to notify the end of the data transfer (step 34).

[Problem that the invention seeks to solve]

In the conventional data transfer method described above, the execution of the next process in the data processing device or the Since the data transfer command cannot be issued, there is a waiting time during that time, resulting in a disadvantage that the efficiency of data processing in the data processing device deteriorates.

In view of the above-mentioned points, an object of the present invention is to provide an instruction table that stores data transfer instructions and instructions that request an interrupt to notify the end of data transfer, and after issuing a data transfer instruction, transfer data based on the data transfer instruction. An object of the present invention is to provide a data transfer method that enables a data processing device to execute the next process or issue the next data transfer command until an interrupt notifying the end of the transfer occurs.

[Means for solving problems]

The data transfer method of the present invention includes an instruction table in which data transfer instructions and interrupt request instructions issued by a data processing device are accumulated as constituent elements, and a reception of data transfer instructions and interrupt request instructions issued by the data processing device. an instruction reception detection means for detecting the instruction reception detection means; and an instruction table creation for accumulating in the instruction table the data transfer instruction and the interrupt request instruction detected when the reception of the data transfer instruction and the interrupt request instruction is detected by the instruction reception detection means. means detects whether or not data transfer is being performed between the data processing device and the data transfer target device, and when data transfer is being performed, control is transferred to the command reception detection means and the data transfer is performed. an instruction execution detection means that transfers control to the instruction reading means when the command is not read out; and an instruction execution detection means that detects whether or not there are data transfer instructions and interrupt request instructions that have not been read out in the instruction table, and when they do not exist, the instruction reception detection means The instruction reading means transfers control and reads data transfer instructions and interrupt request instructions that have not been read out in the order stored in the instruction table when they exist, and the instructions read by this instruction reading means are data transfer instructions. an instruction detection means for determining whether a data transfer instruction is an interrupt request instruction; Transfer starting means starts data transfer with the data transfer target device and transfers control to the command reception detecting means; and when the command detecting means determines that the interrupt request command has been read by the command reading means. and interrupt processing means for generating an interrupt to notify the data processing device of the end of data transfer and transferring control to the command reception detection means.

[Effect]

In the data transfer method of the present invention, the instruction table stores data transfer instructions and interrupt request instructions issued by the data processing device as constituent elements, and the instruction reception detection means stores the data transfer instructions and interrupt request instructions issued by the data processing device. Detecting reception of the command, the command table creation means stores in the command table the data transfer command and the interrupt request command detected when the command reception detection means detects the reception of the data transfer command and the interrupt request command; The command execution detection means detects whether or not data transfer is being performed between the data processing device and the data transfer target device, and when the data transfer is being performed, control is transferred to the command reception detection means and the data transfer is performed. When there are no data transfer instructions and interrupt request instructions that have not been read out in the instruction table, the instruction reading means transfers control to the instruction reception detection means. When there are data transfer instructions and interrupt request instructions that have not been read out in the order accumulated in the instruction table, the instruction detection means determines whether the instruction read by the instruction reading means is a data transfer instruction or an interrupt request instruction. When the command detecting means determines that the data transfer command has been read by the command reading means, the transfer starting means transfers data between the data processing device and the data transfer target device based on this data transfer command. and transfers control to the instruction reception detection means, and generates an interrupt to notify the data processing device of the end of data transfer when the instruction detection means determines that the interrupt request instruction has been read by the instruction reading means. The command is generated and control is transferred to the command reception detection means.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the data transfer method of the present invention.
A data processing device 1 that issues data transfer commands, an input/output control device 2 that controls the input/output device 3 including control of data transfer between the data processing device 1 and the input/output device 3, and the data processing device 1 Input/output device 3 that transfers data between
It is composed of.

The human output control device 2 has an instruction table 20 in which data transfer commands and interrupt request commands issued by the data processing device 1 are stored as constituent elements, and a command table 20 in which data transfer commands and interrupt request commands issued by the data processing device 1 are stored. a command reception detection means 21 for detecting reception; a command table creation means 22 for storing the detected commands in the command table 20 when the command reception detection means 21 detects reception of a data transfer command and an interrupt request command; It is detected whether or not data is being transferred between the data processing device 1 and the input/output device 3, and when data is being transferred, control is returned to the command reception detection means 21 and when data is not being transferred. An instruction execution detecting means 23 transfers control to the instruction reading means 24, detects whether or not there is an unread instruction in the instruction table 20, and returns control to the instruction reception detecting means 21 when there is no unread instruction. An instruction reading means 24 for reading out unissued instructions in the order stored in the instruction table 20, and an instruction successive issuing means 24.
When the instruction detection means 25 determines whether the read instruction is a data transfer instruction or an interrupt request instruction, and the instruction detection means 25 determines that a data transfer instruction has been read by the instruction reading means 24. Then, based on the data transfer command, the transfer starting means 26 starts data transfer between the data processing device 1 and the input/output device 3 and returns control to the command reception detecting means 21, and the instruction reading means 24 receives the interrupt request command. and an interrupt processing means 27 which generates an interrupt to notify the data processing device 1 of the end of data transfer when the command detection means 25 determines that the data has been read, and returns control to the command reception detection means 21. There is.

The instruction table 20 includes components 201, 202, 203 . . . whose content is a data transfer instruction or an interrupt request instruction.・
It is composed of...

Referring to FIG. 2, the processing of the data transfer method of this embodiment includes a command reception detection step 11, an instruction table command accumulation step 12, a data transfer execution detection step 13, and an instruction table unread command existence determination step 14. and,
It consists of an instruction table instruction read step 15, an instruction determination step 16, a data transfer activation step 17, and an interrupt generation step 18.

Next, the operation of the data transfer system of this embodiment configured as described above will be explained.

Assume that a request for data transfer between the data processing device 1 and the input/output device 3 occurs, and a data transfer command is issued to the human output control device 2.

In the command reception detection means 21 of the input/output side '4'n device 2,
It is determined whether reception of a data transfer command or an interrupt request command is detected (step 11).

Since reception of the data transfer command issued from the data processing device l is detected in this judgment, control is transferred to the command table creation means 22, and this data transfer command is stored in the command table 20 as a component 201 (step 1).
2).

Next, control is transferred to the instruction execution detection means 23, which detects whether data is being transferred between the input/output device 3 and the data processing device 1 (step 13). .

As a result of this determination, data transfer has not been executed (has not been activated yet), so control is transferred to the instruction reading means 24.

The instruction reading means 24 determines whether there is an instruction that has not been read out yet in the instruction table 20 (step 14).

As a result of this determination, the component 201 (data transfer instruction) is present, so this data transfer instruction is read from the instruction table 20 (if there are multiple unread instructions in the instruction table 20, they are read in the order in which they were stored). ) (Step 15).

The instruction detection means 25 determines whether the read component 201 is a data transfer instruction or an interrupt request instruction (step 16).

In this determination, since the component 201 is a data transfer command, control is transferred to the transfer starting means 26, and data transfer between the input/output device 3 and the data processing device 1 is started (step 17), and the command reception detecting means Step 1 according to 21
Control returns to determination 1.

If it is determined in step 11 that no data transfer command or interrupt request command has been received (no new command has been issued from the data processing device I), control is transferred to the command execution detection means 23. It is determined whether data transfer is being performed (step 13).

If this determination indicates that the execution of the data transfer started by the data transfer command of the component 201 is not completed but is still being executed, control returns to the determination in step 11 by the command reception detection means 21.

Now, assume that a request for data transfer occurs again in the data processing device 1, and a data transfer command is issued to the input/output control device 2.

At this time, reception of a data transfer command is detected in the determination in step 11, so that the command table creation means 22 stores the data transfer command in the component 2 in the command table 20.
02 (step 12), and control shifts to the determination in step 13 by the instruction execution detection means 23.

Here, it is assumed that the data transfer started by the data transfer command of the component 201 has finished.

At this time, since it is detected in step 13 that data transfer is not in progress, the instruction reading means 24 determines whether or not there is an instruction that has not been read out yet in the instruction table 20 (step 14). As a result of this determination, the component 202 (data transfer instruction) is present, so this data transfer instruction is read out (step 15).

Next, as in the case of the data transfer command of the component 201, the determination in step 16 by the command detection means 25 and the processing in step 17 by the transfer starting means 26 are performed, and the The data transfer is started, and control returns to the determination in step 11 by the command reception detection means 2I.

Here, in order to confirm whether or not the data transfer based on the data transfer commands issued so far has been completed, an interrupt request command (if the data transfer has been completed, the input/output control device 2 sends an interrupt request command to the data processing device Assume that a command (instruction for generating an interrupt for l) is issued by data processing device ff.

At this time, since reception of an interrupt request command has been detected in the determination in step 11, this interrupt request command is stored as a component 203 in the command table 20 by the command table creation means 22 (step 12), and the command execution detection means Control moves to the determination in step 13 by step 23.

In this judgment, if the data transfer started by the data transfer command of the component 202 has not been completed, step 1 is executed.
Control returns to the determination in step 1 and no interrupt is generated, but when the data transfer has ended, the component 203 (interrupt request instruction) is read by the instruction reading means 24 through the determination in step 14 and the processing in step 15. Then, the instruction detection means 25 determines whether this component 203 is a data transfer instruction or an interrupt request instruction (step 16).

Since this judgment detects that it is an interrupt request command, the interrupt processing means 27 generates a v1 interrupt to notify the data processing device 1 of the end of data transfer (
In step 18), control returns to the determination in step 11 by the command reception detection means 21.

Here, if no new command has been issued from the data processing device t and the reception of the command is not detected in the determination in step 11, control shifts to the determination in step 13, and in this determination, data transfer is not executed. Since the instruction reading means 24 does not have the instruction, control moves to the determination in step 14 by the instruction reading means 24.

Since there are no instructions in the instruction table 20 that have not yet been read out in step 14, the instruction reception detection means 2
Control returns to the determination at step 11 in step 1, and if reception of a new command is detected, the above-described processing is repeated.

In this embodiment, the data transfer target device is the input/output device 3.
Although we have described the case in which the command table 20 and the code 21 are used in the data transfer control device for data transfer between the data processing device 1 and other data transfer target devices such as data processing devices other than the data processing device 1, It goes without saying that the present invention can be applied by implementing each of the means of 27 to 27.

[Effects of the Invention] ′ As explained above, in the present invention, instructions issued by the data processing device are stored in the instruction table even when data transfer is being executed, and are read from the instruction table every time data transfer is completed. Instructions are read out in the order in which they were stored, and when the instruction is a data transfer instruction, data transfer is activated, and when it is an interrupt request instruction, an interrupt is generated to the data processing device to notify the end of data transfer. The data processing device can perform the next process or issue the next data transfer command immediately after issuing a data transfer command without waiting for a report of the end of data transfer, which improves processing efficiency in the data processing device. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart showing the processing of the data transfer method of this embodiment shown in FIG. 1, and FIG. 3 is an example of a conventional data transfer method. 2 is a flow chart showing the processing of FIG. In the figure, 1... data processing device, 2... input/output control device, 3... input/output device, 20... instruction table, 21... instruction reception detection means, 22... instruction table Creating means, 23... Instruction execution detecting means, 24... Instruction successive issuing means, 25... Instruction detecting means, 26... Transfer starting means, 27... Interrupt processing means, 201, 202, 203 ...It is a constituent element.

Claims (1)

[Scope of Claims] An instruction table in which data transfer commands and interrupt request commands issued by a data processing device are stored as constituent elements; and detection of reception of data transfer commands and interrupt request commands issued by the data processing device. command reception detection means for detecting a data transfer command and an interrupt request command; and command table creation means for storing detected data transfer commands and interrupt request commands in the command table when the command reception detection means detects reception of a data transfer command and an interrupt request command. , detecting whether or not data transfer is being performed between the data processing device and the data transfer target device, and when data transfer is being performed, transfers control to the command reception detection means to determine that data transfer is not being performed. an instruction execution detecting means that sometimes transfers control to the instruction reading means; and detecting whether or not there are data transfer instructions and interrupt request instructions that have not been read out in the instruction table, and when they do not exist, controlling the instruction reception detecting means. the instruction reading means for reading out data transfer instructions and interrupt request instructions that have not been read out in the order accumulated in the instruction table; and determining whether the instruction read by the instruction reading means is a data transfer instruction or not; an instruction detection means for determining whether the instruction is a request instruction; and when the instruction detection means determines that the data transfer instruction has been read by the instruction reading means, the data transfer instruction is executed between the data processing device and the data transfer instruction based on the data transfer instruction. transfer starting means that starts data transfer with the target device and transfers control to the command reception detecting means; A data transfer method comprising: interrupt processing means that generates an interrupt to notify a data processing device of the end of data transfer and transfers control to the command reception detection means.