JPS6143349A - Input and output control system - Google Patents

Abstract

PURPOSE:To improve the security of input data by making two peripheral controllers execute the input/output control actions at a time and transferring the input data given from an input/output device to a central processor via plural routes to collate those input data with each other. CONSTITUTION:The input data given from an input/output device 24 is transferred to a central processor 21 via a peripheral controller 22 together with the first transfer indication. In this case, the input data is written to a main memory 211 inside the processor 21 via a main memory access mechanism 210. The controller 22 informs the end of the transfer of data to the device 24 when the data transfer is over. The device 24 transfers the end of data transfer to the processor 21 via a peripheral controller 23 together with the second transfer indication. The processor 21 collates the data already written with the input data transferred newly through a comparison means 212. When the coincidence is obtained from this comparison, the processing is continued as it is. If no coincidence is obtained, the necessary processing is carried out.

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 particularly to a method for controlling input/output devices through a plurality of routes.

Hereinafter, for convenience of explanation, the above-mentioned plurality will be described as 2.

[Prior art]

Conventionally, this type of input/output control method has been used to
Connected to input/output devices via two peripheral control devices, but one
In order to improve the reliability of peripheral control operations, nine peripheral control devices may be duplicated in some cases.

[Problem that the invention seeks to solve]

In this input/output control method, the input/output control information that is exchanged between the central processing unit and the input/output device and the data validity check of the input/output data are encoded to provide data redundancy. Generally, a checking method is used. However, it is often difficult in terms of cost and technology to perform such checks over the entire route, and it is common for there to be no means for checking one part of the route.

Furthermore, the checking means has a limited detection function, and there is concern about ensuring the validity of input/output result data.

In contrast, by multiplexing input/output control information and output data over input/output control routes.

It has been proposed to solve this problem by using an input/output control method that performs a verification check, but this does not apply to input data.

The present invention provides input/output with high integrity of input data.

The aim is to provide a control method.

[Means for solving problems]

The present invention enables simultaneous input/output activation of two peripheral control devices by the central processing unit.

On the other hand, the peripheral control device performs the same control operation.

The input/output device first transfers input data to the central processing unit via one peripheral control unit and writes it into main memory, and then transfers the same input data to the central processing unit via another peripheral control unit. The data is transferred and compared with the input data that has already been written to check whether there is any discrepancy.

The control method according to the present invention uses a central processing unit.

A plurality of peripheral control devices are connected to the central processing unit through separate input/output interfaces, and a plurality of peripheral control devices are connected to the central processing unit via separate device interfaces, respectively. Equipped with input/output devices.

In an input/output control system in which the same channel program is simultaneously executed from the central processing unit to different peripheral control devices, input data from the input/output device is sent to the central processing unit via one of the peripheral control devices. at least one step of transferring the input data to the central processing unit via another peripheral control device and comparing and collating the input data with the input data that has already been written.
The method is characterized by comprising means for performing the same operation twice.

[Effect]

The present invention provides input/output control with high integrity of input data by multiplexing control paths from the central processing unit to the input/output devices and comparing and collating input data numbers obtained from each system within the central processing unit. This is what makes it possible.

〔Example〕

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

The present invention, as shown in FIG.
, peripheral control devices n and B connected to the central processing unit 21 by separate input/output interface sections and %, and input/output devices connected to the central processing unit 21 by separate device interfaces n and public, respectively. be done.

The present invention comprises 1 peripheral control device and 2 central processing unit 21.
The feature is that multiple identical channel programs are executed simultaneously.

The present invention also includes: The central processing unit 21 has input data from the input/output device U transferred via a certain peripheral control device 22 (or 23).

The feature is that after the data is written into the main memory, it is transferred via another peripheral control device 23 (or 22) and the data is compared with the data that has already been written.

Among these features, the method of executing the channel program can be easily realized by a microprogram of the central processing unit, so a description thereof will be omitted here.

The method for performing data matching will be explained below.

For convenience of explanation, FIG. 1 is a diagram showing the inside of the central processing unit 21 in functional blocks, focusing only on the parts related to the present invention.

Here, the input data from the input/output device Sae.

11 Initial transfer instruction 11 is temporarily transferred to the central processing unit 21 via the peripheral control device 4.

The input data is transferred from the input/output device 21 to the peripheral control device 22 or B first, depending on which one receives the channel program start request first. Next, the first peripheral control device 22 transfers the input data to the central processing unit 21 along with the first transfer instruction 11 . Central processing unit 2
Inside 1, input data is written to main memory 211 via main memory access mechanism 210 in accordance with 11 first transfer instruction +1.

After the data transfer, the peripheral control device n notifies the input/output device that the data transfer is complete. I/O devices.

The same input data is transferred again to the central processing unit 21 via the peripheral control unit 21 along with the 1 retransmission instruction II. In the central processing unit 21, the comparison means 212 compares the data that has already been written by causing the main memory access mechanism 210 to perform reading according to the retransmission instruction 11 and the newly transferred input data. This matching is performed more than once. As a result of the comparison, if there is a discrepancy, this is reported to the software and the necessary processing is performed, and if there is a match, processing is continued.

〔Effect of the invention〕

As explained above, the present invention allows two peripheral control devices to simultaneously execute input/output control operations.

By transferring input data from the input/output devices to the central processing unit via multiple routes and collating them, there is an effect that input/output control operations with high integrity of the input data can be performed.

[Brief explanation of the drawing]

FIG. 1 is an input/output control system diagram showing an embodiment of the present invention. 21...Central processing unit, 22.23...Peripheral control device. U...I/O device, 25.26...I/O interface. n, 28...Tehice interface. 210... Main memory access mechanism, 211... Main memory. 212...Comparison means.

Claims (1)

[Claims] 1. A central processing unit, a plurality of peripheral control devices connected to the central processing unit through separate input/output interfaces, and a plurality of peripheral control devices connected to the central processing unit through separate device interfaces, respectively. In an input/output control system, the input/output control system includes an input/output device connected to a central processing unit and simultaneously executes the same channel program to different peripheral control devices from the central processing unit. means for transmitting the input data to the central processing unit via one of the peripheral control devices and writing it into the main memory; and means for transmitting the input data to the central processing unit via the other peripheral control device and comparing it with the input data that has already been written. An input/output control method comprising means for performing verification at least once.