JPS60256861A - Input and output control system - Google Patents

Abstract

PURPOSE:To secure the quick execution of an input/output action despite the breakdown of a peripheral controller of a certain system, by executing simultaneous input/output conrol for plural peripheral controllers to process only the first coming controller and to neglect the last coming controller. CONSTITUTION:In case a peripheral controller 2 rises a control start signal eariler than a peripheral controller 3, the controller 2 sets an RQ1 signal line 11 at 1. An input/output device 10 confirms 0 of a signal line 16 of an AP2 and sets a signal line 12 of AP1 at 1. The controller 2 can use the device 10 when the line 12 is set at 1. When an input/output action is over, the device 10 sets the line 12 at 0. The controller 2 sets the line 11 also at 0 when the line 12 is set at 0. When the line 12 is kept at 1, an answer is given only to an interface signal line group 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an input/output control method in a data processing system, and more particularly to an improvement in a method for controlling a plurality of hardware input/output devices.

(Prior Art) Conventionally, in this bulk input/output control system, a central processing unit has been connected to input/output devices via one peripheral control device. In the past, it was not possible to control the stones and input/output devices that caused abnormalities in the peripheral control equipment. Furthermore, even when peripheral control devices are multiplexed to correct the above-mentioned abnormality, the conventional central processing unit controls the input/output devices via one peripheral control device. FIG. 1 is a block diagram showing such a configuration. In Figure 1, 1 is the central processing unit, 2
and 6 are peripheral control devices, and 4 is an input/output device. As is clear from Figure 1, if the first input/output operation ends abnormally due to an abnormality in a peripheral control device, it is necessary to restart the input/output operation for other peripheral control devices. There was, therefore, a software override for retrying input/output operations, and RAD had this drawback. Furthermore, the above method has the disadvantage that if the first peripheral control device is being used for input/output operations by another input/output device, a new input/output operation must be awaited.

(Objective of the Invention) An object of the present invention is to simultaneously activate input/output from a central processing unit to a plurality of peripheral control devices, thereby causing the peripheral control devices to perform the same control operation, Then, among the plurality of control operations mentioned above, the above-mentioned drawback can be eliminated by processing only the one that arrives first and ignoring the one that arrives later. Input/output operations can be executed quickly even if an operation becomes impossible, and even if one peripheral control device is being used for another input/output operation, another system's peripheral control device may be in use. If the latter is not the case, the present invention aims to provide an input/output control method configured and realized so as to enable quick input/output control operations.

(Structure of the invention) The input/output control method according to the present invention uses a central processing unit.

This is realized by configuring a plurality of peripheral control devices and input/output devices.

The central processing unit is for performing processing including input/output operations. A plurality of peripheral control devices are designed to perform the same control operation by simultaneously activating input/output operations by the central processing unit.

The input/output device performs input/output operations such that it processes only the control operations that arrive first, and ignores those that arrive later.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

The input/output control system according to the present invention includes a central processing unit 1, peripheral control units 2 and 6 connected to the central processing unit 1 through input/output interfaces 5 and 6, respectively;
This is realized by device interfaces 7 and 8 and an input/output device 4 connected to peripheral control devices 2 and 3, respectively. In the input/output control method according to the present invention, firstly, the peripheral control devices 2 and 6 are connected to the central processing unit 1.
The second input/output device 4 is used to simultaneously execute the same channel program transferred to the peripheral control device 2.
and 6 control activation signals are accepted on a first-come-first-served basis, and only one of each 1j is accepted, and those that arrive later are ignored. The first method described above can be easily realized by a microprogram of the central processing unit, so its explanation will be omitted here.

The second method will be explained below.

FIG. 2 is a detailed diagram focusing on the input/output device 4 in FIG. 1, and the input/output device 4 in FIG. 1 corresponds to the input/output device 10 in FIG. In FIG. 2, the device interface 7 corresponds to the control signal lines 11 to 13 and the interface signal line group 14, and the device interface 8 corresponds to the control signal lines 15 to 17 and the interface signal line group 18. Device interfaces 7 and 8 are logically equivalent. Since the interface signal line groups 14 and 18\1 are existing device interfaces, they will not be particularly explained here. Here, the control signal lines 11 to 13, 15 to 17 are connected to RQl, API, BSl, RQ2. They are called AP2; and BS2, and changes in the states of the signals on the control signal lines will be explained below.

First, we will deal with the operation when the peripheral control device 2 raises the control activation signal earlier than the peripheral control device 6.

As shown in FIG. 8, the peripheral control device 2 sets the state of the signal line 11 representing RQl to NIN. The input/output device 10 is A
After confirming that the state of the signal line 16 representing P2 is %QI, the state of the signal line 12 representing API is set to %11. The peripheral control device 2 can use the input/output device 10 when the state of the signal line 12 representing AP"1 becomes %1#. When the input/output operation is completed, the input/output device 1
0 sets the state of the signal line 12 representing the API to %O1.

In the peripheral control device 2, the state of the signal line 12 representing the API is %.
When QI is reached, the state of signal line 11 representing RQl is %O.
Since the state of the signal line 12 representing oAPl that becomes I is 1, it responds only to the interface signal line group 14.

Next, the operation of the peripheral control device 3 will be explained.

The peripheral control device 6 indicates that the state of the signal line 15 representing RQ2 is -
Become IN. The input/output device 10 has a signal line 1 representing an API.
Since the state of BS2 is %11, the signal line 1 representing BS2
The state of 7 becomes Qi 1. AP2t-Representing signal line 16
Instead, the state of the signal line 17 representing BS2 has become aII, so the peripheral control device 3 gives up on using the input/output device 10. When the input/output operation is completed, the state of the signal line 17 representing BS2 of the input/output device 10 becomes O. When the state of the signal line 17 representing BS2 becomes yS01, the peripheral control device 6 changes the state of the signal line 15 representing RQ2 to ThQIF. In the input/output device M10, since the state of the signal line 16 representing AP2 is %QI, the interface signal line group 18 becomes operational.

Next, we will deal with the case where the peripheral control device 2 is slower than the peripheral control device 3 and raises the control activation signal. This case corresponds to the case where the operations of the peripheral control devices 2 and 3 are reversed in the above case. This process is shown in the timing chart of Fig. 4.In this way, the input/output device 4 accepts only one control activation signal from the peripheral control devices 2i- and 6 on a first-come, first-served basis, and ignores the signals that arrive later. It turns out.

The present invention can coexist with conventional input/output control methods. Furthermore, it is possible to employ the conventional input/output control method in the input/output device to which the present invention is applied.

(Effects of the Invention) As explained above, the present invention allows a plurality of peripheral control devices to operate simultaneously to execute input/output control, and only those that access the input/output device faster than others control the input/output device. By configuring it to be used, there is an effect that even if a peripheral control device of a certain system goes down, input/output operations can be performed quickly. Furthermore, even if one system is being used for input/output control by another system, it is possible to quickly perform input/output control operations if it is not being used by another system.

[Brief explanation of drawings]

FIG. 1 is a 11° block diagram showing an input/output control system for realizing an embodiment of the input/output control method according to the present invention. FIG. 2 is a block diagram showing details of the input/output device shown in FIG. 1. FIGS. 8 and 4 are timing charts of control signal lines forming the device interface. 1... Central processing unit 2.6... Peripheral control device 4.10... Input/output device 5-8, 11-1B... Signal line Figure 1 Figure 2

Claims (1)

[Claims] a central processing unit for executing all processing including input/output operations; a plurality of peripheral control devices for performing the same control operation by simultaneously starting the input/output operations on the central processing unit; This was achieved by configuring the system to include an input/output device for performing the input/output operations so that only the first arriving control operations are processed and the later arriving ones are ignored. Characteristic input/output control method.