JPS62278659A - Data processor - Google Patents

Abstract

PURPOSE:To completely avoid the occurrence of control errors of an I/O device caused by the switching of processors by preventing such a case where the processing of the I/O device is forcibly finished halfway when the switch signal is supplied for the changeover of processors which control the I/O device. CONSTITUTION:When a processor is performing a series of control actions for an I/O device 7 in case of operating a control switch 9, the supply of the switch signal is prevented by the lock signal to a changeover switch 5 from a switch 8. Thus it is possible to avoid completely the interruption of a series of control actions for the device 7 that is carried out by the processor. Then the output of the lock signal is discontinued after said control actions of the device 7 are over via the processor. Then the switch signal is supplied to the switch 5 from the switch 8 and the device 7 is connected to another processor. Hereafter this new processor controls the device 7.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Industrial Publication Field) This invention relates to a data processing device, and more specifically, it has a plurality of processors, and any The present invention relates to a data processing device capable of controlling an I/O8i device.

<Prior Art> Conventionally, as a data processing device, in addition to those in which a specific I/O device is controlled by only a single processor, there are also devices that have multiple processors and each processor controls the same I/O device. There have been provided devices that can control the O1 device.

Data processing equipment with the latter configuration mainly uses other processors to control the operation of air conditioners, etc. when a failure occurs in one processor, or when performing a window inspection. This is suitable for use in cases where the system is not interrupted.

As a specific configuration, for example, as shown in FIG. 15) is selectively connected to the switch (16) and the I/O interface (17), and an externally operated operation switch (18) is connected between the control input terminals. 19) to each of the above processors (
11) A switching signal is supplied to (12), and a switching signal is also supplied to the changeover switch (16).

In the above-mentioned 41 data processing devices, as shown in the flowchart of FIG.
8) is operated, the changeover switch (1
6) and the other processor and I/OR device (15
), the processor that controls the Ilobo device (15) can be replaced.

Therefore, up to the above alternating operation, the l/O111 unit (15)
The processor connected to is an I/O8N device (15)
This means that the l/O1fl unit (15) can be repaired and repaired in the event of a failure while still being controlled.
Alternatively, periodic inspections etc. can be performed.

<Problems to be Solved by the Invention> In the data processing device having the above configuration, the operation of the operation switch (18) is performed regardless of whether or not the L/O1 unit (15) is controlled by the processor. If the I/OII device (15) is controlled by the other processor, the changeover switch (16) is operated by immediately outputting a changeover signal from the changeover (19), and the state in which the I/OII device (15) is controlled by the other processor is selected. I/O equipment (1
The above-mentioned state may be selected during the process of 5). In this case, I/
O1jl device (15) processing is not performed normally,
Since the abnormal termination occurs, it is detected that the abnormal termination is due to connection switching, and the necessary error processing is performed thereafter. After the error processing is completed, I/OI! by the switched processor is detected. This results in normal control of the 1 unit (15).

However, in reality, control by one processor is interrupted in the middle of processing for the I/O device (15), so the other processor is switched to the I/O8gl.
There is a problem that the I/O device (15) may generate wAvJ when the state of the device (15) cannot be grasped and error processing is performed.

Specifically, if the switching operation is performed in the middle of processing for the l/O1 unit (15), there is a high possibility that the necessary flag setting, resetting, etc. will not be performed, and in which state the switching operation was performed. Therefore, depending on the type of the l/Ovi device (15), the new processor that has been switched will take control, causing malfunctions.

<Object of the invention> This invention was made in view of the above problems,
It is an object of the present invention to provide a data processing device that can smoothly transfer control when a switching operation of a processor that controls an I/O device is instructed.

<Means for Solving the Problems> To achieve the above object, the data processing device of the present invention includes a plurality of processors, an I/O bus, a changeover switch, an operation switch, and a changeover device. It is equipped with.

The plurality of processors output a lock signal while performing a series of accesses, and data for controlling I/O devices is exchanged between them, and the I/O bus is , are connected to each processor, and the above changeover switch is connected to each I/O
The l/oil device is selectively connected to the bus, and the operation switch specifies the state of the changeover switch, and the changeover device inputs the operation state of the operation switch and a lock signal. When the output of the lock signal by the processor stops, the changeover switch is switched to the side corresponding to the operation state of the operation switch, and a changeover signal is supplied to each processor.

Effect> Data processing with the above configuration 3! ! ! In the case of a device, if the operation switch is operated to control the I/O 1 unit by another processor while one processor is controlling the I/O 1 unit, the operation of the operation switch is The changeover device switches the changeover switch based on the state and the fact that the output of the lock signal from the processor that was controlling the I/O device until the operation switch was operated has stopped, and the switch specified by the operation of the operation switch is The I/O bus connected to the specified processor is connected to the I/O61 device, and the I/O1 by the specified processor is connected.
It is possible to control the device.

That is, even if the operation switch is operated, the connection state between the processor and the I/O41N device is not changed immediately, but the connection state can be changed only when the processing of the I/O41N device by the processor is completed. be.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 1 is a block diagram showing an embodiment of a data processing device of the present invention, in which two processors (11[2) are connected to an I/O bus (31[4]), and
I/O is controlled by the selector switch (5) for each I/O bus.
The interface (6) is selectively connected to the I/O interface (6) to connect the l/on device (power) to the switch (8) that drives the switch (5). An operation switch (9) is connected between the input terminals.The switch (8) is connected to each processor (11).
In addition to supplying a switching signal to each processor (21), each processor (11+21) receives a lock signal (a signal indicating that the I/O memory unit f71 is currently processing). .

The operation of the data processing apparatus having the above configuration will be described below with reference to the flowcharts of FIGS. 2 and 3. Furthermore, Fig. 2 shows the operation in each processor, and Fig. 3 shows the operation in each processor.
The figure shows the operation of the switch (8).

First, the operation of each processor will be explained.

In step (2), in order to perform processing corresponding to failure occurrence, periodic inspection, etc., the switch waits until the switching signal state is input from the switch (8), and then, in step (2), the signal to itself is ON. whether the self is I
/O device ('71) is determined whether it is in a state where it can be controlled.

Then, if it is determined that the state in which the t/Oo device (sword can be controlled) is selected, a lock signal is output in step The output of the switching signal to the I/OIl device (sword) is prohibited in step (3).

Thereafter, in step ■, the I/O determines whether an error has occurred in the processing of the device (7), and if it is determined that an error has occurred, it outputs a lock signal in step ■. By stopping, it is possible to supply a switching signal from the changeover device (8) to the changeover switch (5),
Necessary error processing is performed in step (3).

Furthermore, if it is determined in step ■ that no error has occurred, the output of the lock signal is stopped in step ■, allowing the switching signal to be supplied from the changeover device (8) to the changeover switch (5). Make it.

Furthermore, if it is determined in the above step (■) that the state in which the l/O1m device (7) can be controlled is not selected, in the step (■) the I/O bus is
Process 3 when not connected to interface (6)
! ! ! (For example, processing for receiving information indicating the status of the I/O device (7) from the processor controlling the I/O device [71, etc.).

In addition, the switch (8) waits until there is a switching request in step (2), that is, until the operation switch (9) is operated, and then in step (2) the I/O device (
Wait until the lock signal output from the processor controlling the sword stops. Then, when the lock signal output from the processor is stopped, a switching signal is supplied to the switching switch (5) in step (3).
The O interface (6) is connected to the other I/O bus, and a switching signal (switched state signal) is supplied to the other processor in step (3).

That is, at the time when the operation switch (9) is operated,
When a series of controls of the I/O□ device (7) is performed by the processor, a lock signal from the processor prevents the supply of the switching signal from the switching device (8) to the changeover switch (5); I/O equipment (7) using the above processor
) can be reliably prevented from interrupting the series of controls.

And I/O by processor! i device (Once the series of controls for the sword is completed, the output of the lock signal will be stopped,
By supplying a switching signal from the changeover device (8) to the changeover switch (5), the other processor and the I/O device (71
A state is selected in which the two processors are connected, and from then on, the other processor controls the I/O shield (7).

Therefore, it is possible to reliably prevent the occurrence of errors associated with the switching operation by the changeover switch (5), and to always use the I/O switch (7).
can be controlled normally.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, step
It is possible to omit step ■ and insert the same processing step as step ■■ between step ■ and step ■, and to make various design changes without changing the gist of the invention. is possible.

<Effects of the Invention> As described above, according to the present invention, when a signal for switching the processor that controls the l/O1 device is supplied, the processing of the l/Oi device that has already been performed is completed. I
This function prohibits the switching operation of the processor connected to the /O11 unit, and reliably prevents the processing of the I/O device from being forcibly terminated midway through, so the I/O device that is connected to the
/'It is possible to reliably prevent the occurrence of errors in the control of the oil device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the data processing device of the present invention, FIG. 2 is a flowchart explaining the operation of the processor, FIG. 3 is a flowchart explaining the operation of the switch, and FIG. 4 is a conventional example. FIG. 5 is a flowchart.

Claims (1)

[Claims] 1. Locked while performing a series of accesses. In addition to outputting a clock signal, the data transfer for controlling I/O devices. A plurality of processors on which reception is performed, each I/O bus connected to the processor and I/O devices for each I/O bus. Selective connection switch and switch Operation switch that specifies the switch state , the operation status of the operation switch, and the The processor takes the clock signal as input. The operation will start when the output of the lock signal stops. switch to the side corresponding to the operating state of the switch. At the same time as changing the switch, Switching that supplies the switching signal to the sensor Data characterized by comprising a container. Processing equipment.