JPS617965A - Input/output control device - Google Patents

Abstract

PURPOSE:To obtain an input/output control device whose processing time is utilized effectively, by constituting it so that a control coinciding with specifications can be executed by utilizing a series of command words without changing them, with respect to peripheral equipments which utilize the same software but have different specifications, as well. CONSTITUTION:When the processing of a peripheral equipment is executed, ''1'' is set to a corresponding bit position of an effective command use register 13 so that an ANd element 19 is operated. Also, the same bit pattern as a seek RPS command is set to one of a command bit register 11 or 12 to be compared. When a coincidence of an output of the register 11 or 12, and a command field of an input/output command word is detected by a comparator 16 or 17, an operation based on this input/output command word is not executed by an execution control part 16, in an effective state and a coincidence state, and read-out of a search command being the next input/output command word and an operation based on said command are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an input/output control device for a digital computer. In particular, the present invention relates to means for controlling execution of input/output command words in an input/output control device. [Prior Art] Fig. 2 shows a system in which an input/output control device is used. The input/output control device 23 sends the start instruction from the central processing unit 21 to the peripheral control device 24, and also outputs the input/output command word stored in the main storage device 22 based on the instruction code sent from the peripheral control device 24. Read and execute. Further, the peripheral devices 251 to 253 are controlled by the peripheral control device 24.

In the conventional input/output control device, when a peripheral device is newly connected, a series of input/output command words corresponding to this peripheral device are newly provided in the main storage device 22, and the peripheral control device 24 This method requires means for ignoring operations based on input/output command words that become unnecessary due to the use of the same series of input/output command words, and has the disadvantage that processing time cannot be made effective.

That is, as shown in FIG. 3, the main memory stores a series of input/output command words in a format consisting of an instruction field, a flag field, a count field, and a buffer address.

Now, when this input/output command word is an input/output command word for disk control, as shown in FIG. , and a read command 44. In particular, the seek RPS command 42 commands the head to move to a predetermined cylinder position on the disk constituted by a rotating medium. This moving operation generally takes a long time, and the peripheral control device 24 can use this time period to control other peripheral devices.

However, with the advent of electronic disk drives that utilize highly integrated memory devices that do not have a rotating medium, the wait times required for conventional disks that have a rotating medium are no longer necessary.

Further, the recording operation of this electronic disk device is executed using software of the same format as that of conventional disk devices. Therefore, the electronic disk device 251 is connected to the conventional disk device 252.
and 253, seek command 41
The existence of these commands actually lengthens the processing time, and the creation of a new series of input/output commands makes it difficult for the software to
There was a drawback that the etching process was complicated.

[Problem that the invention seeks to solve]

The present invention eliminates the above-mentioned drawbacks, and even if the same series of input/output command words are used for input/output control of peripheral devices using the same software but having different specifications,
It is an object of the present invention to provide an input/output control device that makes effective use of processing time.

[Means for solving problems]

The present invention is an input/output control device connected to a main memory in which input/output command words are stored and a central processing unit that generates a start command. a first storage means for storing a valid instruction included in the start instruction; a second storage means for storing a bit pattern included in the start instruction; a third storage means for storing an input/output command word; a comparison means for comparing the part representing the control type included in the input/output command word stored in the third storage means; and a comparison means for comparing the input/output command word stored in the third storage means based on the output of the comparison means. The present invention is characterized by comprising an execution control unit that prohibits execution and executes the input/output command word following the input/output command word.

[Effect]

When there is a valid instruction included in the start instruction generated by the central processing unit, a portion representing the control type included in the input/output instruction word stored in the main memory is stored in the compared instruction bit register. The video included in the start instructions
The second pattern is compared with the comparison means to test whether there is a match or a mismatch, and based on this test, the current input/output command word stored in the second storage means and the next input/output command word are One of the input/output command words stored in the main memory is selected, and the execution control unit executes control of the peripheral control device based on the selected input/output command word.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be explained below based on the drawings. FIG. 1 is a block configuration diagram showing the configuration of the apparatus of this embodiment.

First, the configuration of this embodiment device will be explained based on the drawings. This embodiment device consists of compared command bit registers 1) and 12, comparators 16 and 17, valid indication register 13, processing peripheral device number register 14, input/output command word register 15, and logical OR It includes an element 18, an AND element 19, and an execution control section 20. Central processing bag N2
1) and 1 via interface 53 which is part of interface 52 from
2 and to a first input of the valid indicating L register 13 via an interface 54 which is part of the interface 52 from the central processing unit 21 . The output of the processing peripheral device number register 14 is connected to the second input of the valid indication register I3, and the output of the main memory 22 is connected to the input/output command word register 15 via the ink face 50. Compared command bit register 1
) is connected to one input of the comparator 16, the output of the compared command focus register 12 is connected to the first input of the comparator 17, and the command field output of the input/output command word register 15 is connected to one input of the comparator 16. and the other input of 17. The output of comparator 16 is connected to one input of OR element 18, and the output of comparator 17 is connected to the other input of OR element 18. The output of the OR element 18 is connected to one input of the AND element 19, the output of the comparison valid instruction register 14 is connected to the other input of the AND element 19, and all fields of the input/output command word register 13 are output. is connected to one input of the execution control section 20. AND element 19
The output of is connected to the other input of the execution control section 20. One output of the execution control section 2o is connected to the input of the main memory bag N22 via an interface 50, and the other output of the execution control section 2o is connected to an input/output command word execution section (not shown).

Next, the operation of this embodiment device will be explained based on FIGS. 1 to 4.

Peripheral device 251 of the peripheral devices involved in the control by the apparatus of this embodiment is an electronic disk device, and other peripheral devices 252 and 253 are disk devices having rotating media. Now, when processing of the peripheral device 251 is performed, rlJ is set in the corresponding bit position of the valid instruction register 13 so that the AND element 19 operates, and the same bit pattern as the seek RPS command 42 is set to be compared. Set to either command bit register 1) or 12. Here, when the comparator 16 or 17 detects a match between the output of the target branch instruction bit register 1) or 12 and the command field of the input/output command word, in the valid state and this match state, the execution control unit 16 Then, the operation based on this input/output command word 42 is not executed, and the next input/output command word, search command 43, is read out and the operation based on this command is executed.

〔Effect of the invention〕

As described above, the present invention allows peripheral devices that use the same software but have different specifications to be controlled in accordance with the specifications by using a series of command words without changing them. Therefore, the processing time required for peripheral device control is shortened and the software is simplified.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a block configuration diagram showing the configuration of a system in which the embodiment device is used. FIG. 3 is a frame configuration diagram showing the configuration of input/output command words used in the embodiment device. FIG. 4 is a frame configuration diagram showing the configuration of a human output command word for disk control used in the embodiment device. 1). 12...Compared command focus register, 13...
- Valid instruction register, 14... Peripheral device number register in process, 15... Input/output command word register, 16.1
7... Comparator, 18... OR element, 19... AND element, 20... Execution control unit, 21... Central processing unit, 22... Upper storage device, 2X+... - Input/output control device, 24... Peripheral control device, 251 to 253...
Peripheral equipment.

Claims (1)

[Claims] (1) In an input/output control device connected to a main storage device in which input/output command words are stored and a central processing unit that generates a start instruction, a first storage means for storing a valid instruction included in the start instruction. a second storage means for storing the bit pattern included in the start instruction; a third storage means for storing the input/output command word; and a second storage means for storing the bit pattern and the input/output command word stored in the third storage means. a comparison means for comparing a part representing the control type included in the output command word; and based on the output of the comparison means, prohibiting execution of the corresponding input/output command word stored in the third storage means. An input/output control device comprising: an execution control section that executes an input/output command word following an input/output command word.